LT180080MHz, 25V/µs Low PowerRail-to-Rail Input and OutputPrecision Op AmpDESCRIPTIOsssssssssssssGain Bandwidth Product: 80MHzInput Common Mode Range Includes Both RailsOutput Swings Rail-to-RailLow Quiescent Current: 2mA MaxInput Offset Voltage: 350µV MaxInput Bias Current: 250nA MaxLow Voltage Noise: 8.5nV/√HzSlew Rate: 25V/µsCommon Mode Rejection: 105dBPower Supply Rejection: 97dBOpen-Loop Gain: 85V/mVAvailable in the 8-Pin SO and 5-Pin Low Profile(1mm) ThinSOTTM PackagesOperating Temperature Range: –40°C to 85°CThe LT®1800 is a low power, high speed rail-to-rail inputand output operational amplifier with excellent DC perfor-mance. The LT1800 features reduced supply current, lowerinput offset voltage, lower input bias current and higherDC gain than other devices with comparable bandwidth.The LT1800 has an input range that includes both supplyrails and an output that swings within 20mV of either sup-ply rail to maximize the signal dynamic range in low supplyapplications.The LT1800 maintains its performance for supplies from2.3V to 12.6V and is specified at 3V, 5V and ±5V supplies.The inputs can be driven beyond the supplies withoutdamage or phase reversal of the output.The LT1800 is available in the 8-pin SO package with thestandard op amp pinout and in the 5-pin SOT-23 package.For dual and quad versions of the LT1800, see the LT1801/LT1802 data sheet. The LT1800 can be used as a plug-inreplacement for many op amps to improve input/outputrange and performance., LTC and LT are registered trademarks of Linear Technology Corporation.ThinSOT is a trademark of Linear Technology Corporation.UAPPLICATIO SsssssLow Voltage, High Frequency Signal ProcessingDriving A/D ConvertersRail-to-Rail Buffer AmplifiersActive FiltersVideo Line DriverTYPICAL APPLICATIOSingle Supply 1A Laser Driver Amplifier5VLaser Driver Amplifier500mA Pulse ResponseVINDO NOT FLOAT+–LT1800R310ΩC139pFR2330ΩQ1ZETEXFMMT619IR LASERINFINEONSFH495100mA/DIVR11Ω1800 TA01U50ns/DIV1800 TA02FEATURESU 1800f1
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LT1800
ABSOLUTE AXI U RATI GSTotal Supply Voltage (VS– to VS+).........................12.6VInput Current (Note 2)........................................±10mAOutput Short-Circuit Duration (Note 3)............IndefiniteOperating Temperature Range (Note 4)..–40°C to 85°CUUWPACKAGE/ORDER I FOR ATIOTOP VIEWNC1–IN2+IN3VS–4ORDER PARTNUMBER8765NCVS+VOUTNC+IN 3S8 PART MARKING18001800IS8 PACKAGE8-LEAD PLASTIC SOTJMAX = 150°C, θJA = 190°C/WS5 PACKAGE5-LEAD PLASTIC SOT-23TJMAX = 150°C, θJA = 250°C/WConsult LTC Marketing for parts specified with wider operating temperature ranges.ELECTRICAL CHARACTERISTICSTA = 25°C, VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted.SYMBOLPARAMETERVOSInput Offset VoltageCONDITIONSVCM = 0VVCM = 0V (SOT-23)VCM = VSVCM = VS (SOT-23)VCM = 0V to VS – 1.5VVCM = 1VVCM = VSVCM = 1VVCM = VS0.1Hz to 10Hzf = 10kHzf = 10kHzf = 100kHzVS = 5V, VO = 0.5V to 4.5V, RL = 1k at VS/2VS = 5V, VO = 1V to 4V, RL = 100Ω at VS/2VS = 3V, VO = 0.5V to 2.5V, RL = 1k at VS/2VS = 5V, VCM = 0V to 3.5VVS = 3V, VCM = 0V to 1.5VVS = 2.5V to 10V, VCM = 0V353.5308578080972.32.5MINTYP753000.50.7202550025251.48.5128588510597VSMAX35075033.51802501500200200UNITSµVµVmVmVµVnAnAnAnAµVP-PnV/√HzpA/√HzpFV/mVV/mVV/mVdBdBVdBV 1800f∆VOSIBIOSInput Offset ShiftInput Bias CurrentInput Offset CurrentInput Noise VoltageeninCINAVOLInput Noise Voltage DensityInput Noise Current DensityInput CapacitanceLarge-Signal Voltage GainCMRRCommon Mode Rejection RatioInput Common Mode RangePSRRPower Supply Rejection RatioMinimum Supply Voltage (Note 6)2
–+–+LT1800CS8LT1800IS8UWWW(Note 1)Specified Temperature Range (Note 5)...–40°C to 85°CJunction Temperature.......................................... 150°CStorage Temperature Range.................–65°C to 150°CLead Temperature (Soldering, 10 sec)..................300°CTOP VIEWVOUT 1VS– 2ORDER PARTNUMBER5 VS+4 –INLT1800CS5LT1800IS5S5 PART MARKINGLTRNLTRP元器件交易网www.cecb2b.com
LT1800
ELECTRICAL CHARACTERISTICSTA = 25°C, VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted.SYMBOLPARAMETERVOLOutput Voltage Swing Low (Note 7)VOHISCISGBWSRFPBWHDtS∆G∆θOutput Voltage Swing High (Note 7)CONDITIONSNo LoadISINK = 5mAISINK = 20mANo LoadISOURCE = 5mAISOURCE = 20mAVS = 5VVS = 3VFrequency = 2MHzVS = 5V, AV = –1, RL = 1k, VO = 4VVS = 5V, VOUT = 4VP-PVS = 5V, AV = 1, RL = 1k, VO = 2VP-P, fC = 500kHz0.01%, VS = 5V, VSTEP = 2V, AV = 1, RL = 1kVS = 5V, AV = +2, RL = 150ΩVS = 5V, AV = +2, RL = 150ΩMINTYP12802251612045045401.680252–752500.350.4MAX5016045060250750UNITSmVmVmVmVmVmVmAmAmAMHzV/µsMHzdBcns%DegShort-Circuit CurrentSupply Current per AmplifierGain Bandwidth ProductSlew RateFull Power BandwidthHarmonic DistortionSettling TimeDifferential Gain (NTSC)Differential Phase (NTSC)202040132The q denotes the specifications which apply over the temperature range of 0°C ≤ TA ≤ 70°C. VS = 5V, 0V;VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted.SYMBOLPARAMETERVOSInput Offset VoltageCONDITIONSVCM = 0VVCM = 0V (SOT-23)VCM = VSVCM = VS (SOT-23)VCM = 0V to VS – 1.5VVCM = 1VVCM = VS – 0.2VVCM = 1VVCM = VS – 0.2VVS = 5V, VO = 0.5V to 4.5V, RL = 1k at VS/2VS = 5V, VO = 1V to 4V, RL = 100Ω at VS/2VS = 3V, VO = 0.5V to 2.5V, RL = 1k at VS/2VS = 5V, VCM = 0V to 3.5VVS = 3V, VCM = 0V to 1.5VVS = 2.5V to 10V, VCM = 0VNo LoadISINK = 5mAISINK = 20mANo LoadISOURCE = 5mAISOURCE = 20mAVS = 5VVS = 3VFrequency = 2MHzVS = 5V, AV = –1, RL = 1k, VO = 4VP-PMINqqqqqqqqqqqqqqqqqqqqqqqqqqqqq∆VOSVOS TCIBIOSAVOLCMRRInput Offset ShiftInput Offset Voltage Drift (Note 8)Input Bias CurrentInput Offset CurrentLarge-Signal Voltage GainCommon Mode Rejection RatioInput Common Mode RangePower Supply Rejection RatioMinimum Supply Voltage (Note 6)Output Voltage Swing Low (Note 7)PSRRVOLVOHISCISGBWSR303258274074TYP1253000.60.7301.55055025257567510193912.31410030025150600403027522MAX50012503.53.7527553001750250250VS2.56020055080300950Output Voltage Swing High (Note 7)Short-Circuit CurrentSupply Current per AmplifierGain Bandwidth ProductSlew Rate202035112.75UNITSµVµVmVmVµVµV/°CnAnAnAnAV/mVV/mVV/mVdBdBVdBVmVmVmVmVmVmVmAmAmAMHzV/µs 1800f
3
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LT1800
ELECTRICAL CHARACTERISTICSSYMBOLPARAMETERVOSInput Offset VoltageThe q denotes the specifications which apply over the temperature rangeof –40°C ≤ TA ≤ 85°C. VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted. (Note 5)CONDITIONSVCM = 0VVCM = 0V (SOT-23)VCM = VSVCM = VS (SOT-23)VCM = 0V to VS – 1.5VVCM = 1VVCM = VS – 0.2VVCM = 1VVCM = VS – 0.2VVS = 5V, VO = 0.5V to 4.5V, RL = 1k at VS/2VS = 5V, VO = 1.5V to 3.5V, RL = 100Ω at VS/2VS = 3V, VO = 0.5V to 2.5V, RL = 1k at VS/2VS = 5V, VCM = 0V to 3.5VVS = 3V, VCM = 0V to 1.5VVS = 2.5V to 10V, VCM = 0VNo LoadISINK = 5mAISINK = 10mANo LoadISOURCE = 5mAISOURCE = 10mAVS = 5VVS = 3VFrequency = 2MHzVS = 5V, AV = –1, RL = 1k, VO = 4VqqqqqqqqqqqqqqqqqqqqqqqqqqqqqMINTYP1754000.750.9301.5506002525MAX70020004430054002000300300UNITSµVµVmVmVµVµV/°CnAnAnAnAV/mVV/mVV/mVdBdB∆VOSVOS TCIBIOSAVOLInput Offset ShiftInput Offset Voltage Drift (Note 8)Input Bias CurrentInput Offset CurrentLarge-Signal Voltage Gain252.52081730736566510193VS902.315105170251503002.57021040090350700CMRRCommon Mode Rejection RatioInput Common Mode RangeVdBVmVmVmVmVmVmVmAmAPSRRVOLPower Supply Rejection RatioMinimum Supply Voltage (Note 6)Output Voltage Swing Low (Note 7)VOHOutput Voltage Swing High (Note 7)ISCISGBWSRShort-Circuit CurrentSupply Current per AmplifierGain Bandwidth ProductSlew Rate12.512.5301030302.170183mAMHzV/µsTA = 25°C, VS = ±5V, VCM = 0V, VOUT = 0V, unless otherwise noted.SYMBOLPARAMETERVOSInput Offset VoltageCONDITIONSVCM = VS–VCM = VS– (SOT-23)VCM = VS+VCM = VS+ (SOT-23)VCM = VS– to VS+ – 1.5VVCM = VS– + 1VVCM = VS+VCM = VS– + 1VVCM = VS+0.1Hz to 10Hzf = 10kHzf = 10kHzf = 100kHzMINTYP1504000.71302540020201.48.512MAX50010003.54.54753501500250250UNITSµVµVmVmVµVnAnAnAnAµVP-PnV/√HzpA/√HzpF 1800f
∆VOSIBIOSInput Offset ShiftInput Bias CurrentInput Offset CurrentInput Noise VoltageeninCINInput Noise Voltage DensityInput Noise Current DensityInput Capacitance4
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LT1800
ELECTRICAL CHARACTERISTICSTA = 25°C, VS = ±5V, VCM = 0V, VOUT = 0V, unless otherwise noted.SYMBOLPARAMETERAVOLCMRRPSRRVOLLarge-Signal Voltage GainCommon Mode Rejection RatioInput Common Mode RangePower Supply Rejection RatioOutput Voltage Swing Low (Note 7)VS+ = 2.5V to 10V, VS– = 0VNo LoadISINK = 5mAISINK = 20mANo LoadISOURCE = 5mAISOURCE = 20mA30Frequency = 2MHzAV = –1, RL = 1k, VO = ±4V, Measured at VO = ±2VVO = 8VP-PAV = 1, RL = 1k, VO = 2VP-P, fC = 500kHz0.01%, VSTEP = 5V, AV = 1V, RL = 1kAV = +2, RL = 150ΩAV = +2, RL = 150ΩCONDITIONSVO = –4V to 4V, RL = 1kVO = –2V to 2V, RL = 100ΩVCM = VS– to 3.5VMIN252.585VS–8097158522517130450501.870230.9–753000.350.22.756017045070260750TYP707109VS+MAXUNITSV/mVV/mVdBVdBmVmVmVmVmVmVmAmAMHzV/µsMHzdBcns%DegVOHOutput Voltage Swing High (Note 7)ISCISGBWSRFPBWHDtS∆G∆θShort-Circuit CurrentSupply Current per AmplifierGain Bandwidth ProductSlew RateFull Power BandwidthHarmonic DistortionSettling TimeDifferential Gain (NTSC)Differential Phase (NTSC)The q denotes the specifications which apply over the temperature range of 0°C ≤ TA ≤ 70°C. VS = ±5V, VCM = 0V, VOUT = 0V, unlessotherwise noted.SYMBOLPARAMETERVOSInput Offset VoltageCONDITIONSVCM = VS–VCM = VS– (SOT-23)VCM = VS+VCM = VS+ (SOT-23)VCM = VS– to VS+ – 1.5VVCM = VS– + 1VVCM = VS+ – 0.2VVCM = VS– + 1VVCM = VS+ – 0.2VVO = –4V to 4V, RL = 1kVO = –2V to 2V, RL = 100ΩVCM = VS– to 3.5VVS+ = 2.5V to 10V, VS– = 0VNo LoadISINK = 5mAISINK = 20mANo LoadISOURCE = 5mAISOURCE = 20mAqqqqqqqqqqqqqqqqqqqqqMINTYP2004500.751451.5304502525MAX80015004567554001750300300UNITSµVµVmVmVµVµV/°CnAnAnAnAV/mVV/mVdB∆VOSVOS TCIBIOSAVOLCMRRPSRRVOLInput Offset ShiftInput Offset Voltage Drift (Note 8)Input Bias CurrentInput Offset CurrentLarge-Signal Voltage GainCommon Mode Rejection RatioInput Common Mode RangePower Supply Rejection RatioOutput Voltage Swing Low (Note 7)20282VS–74555105VS+9117105250251506007021057590310975VdBmVmVmVmVmVmV 1800f
VOHOutput Voltage Swing High (Note 7)5
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LT1800
ELECTRICAL CHARACTERISTICSSYMBOLPARAMETERISCISGBWSRShort-Circuit CurrentSupply Current per AmplifierGain Bandwidth ProductSlew RateThe q denotes the specifications which apply over the temperature rangeof 0°C ≤ TA ≤ 70°C. VS = ±5V, VCM = 0V, VOUT = 0V, unless otherwise noted.CONDITIONSqqMIN25TYP452.47020MAX3.5UNITSmAmAMHzV/µsFrequency = 2MHzAV = –1, RL = 1k, VO = ±4V, Measured at VO = ±2VqqThe q denotes the specifications which apply over the temperature range of –40°C ≤ TA ≤ 85°C. VS = ±5V, VCM = 0V, VOUT = 0V,unless otherwise noted.SYMBOLPARAMETERVOSInput Offset VoltageCONDITIONSVCM = VS–VCM = VS– (SOT-23)VCM = VS+VCM = VS+ (SOT-23)VCM = VS– to VS+ – 1.5VVCM = VS– + 1VVCM = VS+ – 0.2VVCM = VS– + 1VVCM = VS+ – 0.2VVO = –4V to 4V, RL = 1kVO = –1V to 1V, RL = 100ΩVCM = VS– to 3.5VVS+ = 2.5V to 10V, VS– = 0VNo LoadISINK = 5mAISINK = 10mANo LoadISOURCE = 5mAISOURCE = 10mAqqqqqqqqqqqqqqqqqqqqqqqMINTYP3505000.751501.5504502525MAX90022504.55.575054502000350350UNITSµVµVmVmVµVµV/°CnAnAnAnAV/mVV/mVdB∆VOSVOS TCIBIOSAVOLCMRRPSRRVOLInput Offset ShiftInput Offset Voltage Drift (Note 8)Input Bias CurrentInput Offset CurrentLarge-Signal Voltage GainCommon Mode Rejection RatioInput Common Mode RangePower Supply Rejection RatioOutput Voltage Swing Low (Note 7)16281VS–73555104VS+901510517025150300802204001003507004VdBmVmVmVmVmVmVmAmAMHzV/µsVOHOutput Voltage Swing High (Note 7)ISCISGBWSRShort-Circuit CurrentSupply Current per AmplifierGain Bandwidth ProductSlew RateFrequency = 2MHzAV = –1, RL = 1k, VO = ±4V, Measured at VO = ±2V12.5302.66515qqNote 1: Absolute Maximum Ratings are those values beyond which the lifeof the device may be impaired.Note 2: The inputs are protected by back-to-back diodes and by ESDdiodes to the supply rails. If the differential input voltage exceeds 1.4V oreither input goes outside the rails, the input current should be limited toless than 10mA.Note 3: A heat sink may be required to keep the junction temperaturebelow the absolute maximum rating when the output is shortedindefinitely.Note 4: The LT1800C/LT1800I are guaranteed functional over thetemperature range of –40°C to 85°C.Note 5: The LT1800C is guaranteed to meet specified performance from0°C to 70°C. The LT1800C is designed, characterized and expected tomeet specified performance from –40°C to 85°C but is not tested or QAsampled at these temperatures. The LT1800I is guaranteed to meetspecified performance from –40°C to 85°C.Note 6: Minimum supply voltage is guaranteed by power supply rejectionratio test.Note 7: Output voltage swings are measured between the output andpower supply rails.Note 8: This parameter is not 100% tested. 1800f
6
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LT1800TYPICAL PERFOR A CE CHARACTERISTICS VOS Distribution, VCM = 0V(SO-8, PNP Stage)4540PERCENT OF UNITS (%)VS = 5V, 0VVCM = 0VPERCENT OF UNITS (%)302520151050–250–150–5050150INPUT OFFSET VOLTAGE (µV)2501800 G01302520151050–2000–1200–4004001200INPUT OFFSET VOLTAGE (µV)20001800 G02PERCENT OF UNITS (%)35VOS Distribution, VCM = 5V(SOT-23, NPN Stage)3530PERCENT OF UNITS (%)2520151050–25000VS = 5V, 0VVCM = 5VSUPPLY CURRENT (mA)OFFSET VOLTAGE (µV)–1500–5005001500INPUT OFFSET VOLTAGE (µV)Input Bias Currentvs Common Mode Voltage1.00.8VS = 5V, 0VTA = 25°CTA = 125°CTA = –55°CINPUT BIAS (µA)INPUT BIAS CURRENT (µA)0.60.40.20–0.2–0.4–0.6–0.8–1.00.60.50.40.30.20.10NPN ACTIVEVS = 5V, 0VVCM = 5VOUTPUT SATURATION VOLTAGE (V)–1023451INPUT COMMON MODE VOLTAGE (V)UW1800 G391800 G05VOS Distribution, VCM = 5V(SO-8, NPN Stage)454035VS = 5V, 0VVCM = 5V403530252015105VOS Distribution, VCM = 0V(SOT-23, PNP Stage)VS = 5V, 0VVCM = 0V0–1250750–750–250250INPUT OFFSET VOLTAGE (µV)12501800 G38Supply Current vs Supply Voltage45004003TA = 125°C3002001000–100Offset Voltagevs Input Common Mode VoltageTA = –55°CVS = 5V, 0VTYPICAL PARTTA = 25°C2TA = 25°CTA = –55°C1–200–300–400TA = 125°C25000123456789101112TOTAL SUPPLY VOLTAGE (V)1800 G03–50001342INPUT COMMON MODE VOLTAGE (V)51800 G04Input Bias Currentvs Temperature0.80.710Output Saturation Voltagevs Load Current (Output Low)VS = 5V, 0V10.1TA = 125°C0.01TA = 25°CPNP ACTIVEVS = 5V, 0VVCM = 1VTA = –55°C6–0.120–60–40–20040TEMPERATURE (°C)60801800 G060.001 0.01110 0.1LOAD CURRENT (mA)1001800 G07 1800f7
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LT1800
TYPICAL PERFOR A CE CHARACTERISTICS Output Saturation Voltagevs Load Current (Output High)10OUTPUT SATURATION VOLTAGE (V)VS = 5V, 0VCHANGE IN OFFSET VOLTAGE (mV)0.40.2TA = –55°COUTPUT SHORT-CIRCUIT CURRENT (mA)10.1TA = 125°C0.01TA = –55°CTA = 25°C0.001 0.01110 0.1LOAD CURRENT (mA)Open-Loop Gain2000CHANGE IN OFFSET VOLTAGE (µV)CHANGE IN OFFSET VOLTAGE (µV)CHANGE IN OFFSET VOLTAGE (µV)160012008004000–400–800–1200–1600–200000.5RL = 100ΩRL = 1k1.521OUTPUT VOLTAGE (V)Offset Voltage vs Output Current2.0VS = ±5V120110CHANGE IN OFFSET VOLTAGE (mV)1.50.50–0.5TA = 25°C–1.0–1.5TA = –55°C OFFSET VOLTAGE (µV)1.01009080706050VS = ±1.5VTYPICAL PART0208010012060TIME AFTER POWER-UP (SECONDS)40140VS = ±2.5VNOISE VOLTAGE (nV/√Hz)TA = 125°C–2.01530–60–45–30–150OUTPUT CURRENT (mA)8
UWVS = 3V, 0VRL TO GND2.5451800 G14Minimum Supply Voltage0.6706050403020100–10–20–30–40–50–60–70Output Short-Circuit Currentvs Power Supply VoltageTA = 25°CTA = 125°CTA = –55°CSINKINGVS = 5V, 0VTA = –55°CTA = 125°CTA = 25°C1.5242.54.53.53POWER SUPPLY VOLTAGE (±V)5SOURCINGTA = 25°C0–0.2–0.4–0.6TA = 125°C1001800 G0801.522.533.544.5TOTAL SUPPLY VOLTAGE (V)55.51800 G091800 G10Open-Loop Gain2000160012008004000–400–800–1200–1600RL = 100ΩRL = 1kVS = 5V, 0VRL TO GND2000160012008004000–400–800Open-Loop GainVS = ±5VRL TO GNDRL = 1kRL = 100Ω–1200–160031800 G11–200000.511.522.533.54OUTPUT VOLTAGE (V)4.55–2000–5–4–3–2–10123OUTPUT VOLTAGE (V)451800 G121800 G13Warm-Up Drift vs Time(LT1800S8)60VS = ±5V5040302010Input Noise Voltage vs FrequencyVS = 5V, 0VNPN ACTIVEVCM = 4.25V604000.01PNP ACTIVEVCM = 2.5V0.1110FREQUENCY (kHz)1001800 G16 1800 G15 1800f元器件交易网www.cecb2b.com
LT1800TYPICAL PERFOR A CE CHARACTERISTICS Input Current Noise vs Frequency3.02.5NOISE CURRENT (pA/√Hz)VS = 5V, 0VOUTPUT NOISE VOLTAGE (nV)GAIN BANDWIDTH (MHz)2.01.51.00.5NPN ACTIVEVCM = 4.25VPNP ACTIVEVCM = 2.5V00.010.1110FREQUENCY (kHz)Gain Bandwidth and PhaseMargin vs Temperature10090GBW PRODUCTVS = ±2.5VGBW PRODUCTVS = ±5VPHASE MARGINVS = ±2.5VPHASE MARGINVS = ±5V6050403020–55–35–1510525456585105125TEMPERATURE (°C)1800 G20GAIN BANDWIDTH (MHz) 80706050OPEN-LOOP GAIN (dB)SLEW RATE (V/µs)Gain vs Frequency (AV = 1)12RL = 1k9CL = 10pFAV = 1618OUTPUT IMPEDANCE (Ω)GAIN (dB)GAIN (dB)30–3–6–9–120.1110FREQUENCY (MHz)VS = ±5VVS = ±2.5VUW1800 G17 0.1Hz to 10Hz Output VoltageNoise2000VS = 5V, 0V100901000807060Gain Bandwidth and PhaseMargin vs Supply VoltageTA = 25°CGAIN BANDWIDTHPRODUCTPHASE MARGIN (DEG)060PHASE MARGIN504030–1000100–200001234567TIME (SECONDS)8910012345678TOTAL SUPPLY VOLTAGE (V)910201800 G181800 G19Slew Rate vs Temperature35AV = –1RF = RG = 1kRL = 1kGain and Phase vs Frequency70100PHASE806040PHASE (DEG)VS = ±2.5V6050403020100–10–20VS = ±2.5VVS = ±5V0.1GAIN30PHASE MARGIN (DEG)25VS = ±5V200–20–40–60–80201510–55–35–15525456585105125TEMPERATURE (°C)1800 G21–300.01110FREQUENCY (MHz)–1001003001800 G22Gain vs Frequency (AV = 2)RL = 1k15CL = 10pFAV = 2129630–3100300–60.1110FREQUENCY (MHz)100300VS = ±5VVS = ±2.5VOutput Impedance vs Frequency6001001010.10.010.0010.1AV = 2AV = 10AV = 1VS = ±2.5V110FREQUENCY (MHz)1005001800 G251800 G231800 G24 1800f9
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LT1800
TYPICAL PERFOR A CE CHARACTERISTICS Common Mode Rejection Ratiovs Frequency120COMMON MODE REJECTION RATIO (dB)POWER SUPPLY REJECTION RATIO (dB)VS = 5V, 0V1008060402000.0150403020100–100.0010.010.11FREQUENCY (MHz)101001800 G27 OVERSHOOT (%)0.1110FREQUENCY (MHz)Series Output Resistorvs Capacitive Load60555045VS = 5V, 0VAV = 2–40–50DISTORTION (dBc)OVERSHOOT (%)RL = 150Ω, 2NDDISTORTION (dBc)403530252015105010ROS = RL = 50Ω1001000CAPACITIVE LOAD (pF)10000 1800 G29ROS = 10ΩROS = 20ΩMaximum Undistorted OutputSignal vs Frequency4.6OUTPUT VOLTAGE SWING (VP-P)4.54.4AV = 24.3AV = –14.24.14.03.91kVS = 5V, 0VRL = 1k10k100k1MFREQUENCY (Hz)10M1800 G3210
UW1800 G26Power Supply Rejection Ratiovs Frequency90807060NEGATIVESUPPLYVS = 5V, 0VTA = 25°CPOSITIVESUPPLY605550454035302520151050Series Output Resistorvs Capacitive LoadVS = 5V, 0VAV = 1ROS = 10ΩROS = 20ΩROS = RL = 50Ω101001000CAPACITIVE LOAD (pF)100001800 G28 100Distortion vs FrequencyVS = 5V, 0VAV = 1VOUT = 2VP-P–40–50–60Distortion vs FrequencyVS = 5V, 0VAV = 2VOUT = 2VP-PRL = 150Ω, 2ND–70–80–90–100–1100.01RL = 1k,2NDRL = 150Ω,3RD–60–70–80–90–100–1100.01RL = 1k, 2NDRL = 150Ω, 3RDRL = 1k, 3RD0.11FREQUENCY (MHz)101800 G30RL = 1k, 3RD0.11FREQUENCY (MHz)101800 G315V Large-Signal Response5V Small-Signal Response50mV/DIV1V/DIV0V0VVS = 5V, 0VAV = 1RL = 1k100ns/DIV1800 G33VS = 5V, 0VAV = 1RL = 1k50ns/DIV1800 G34 1800f元器件交易网www.cecb2b.com
LT1800TYPICAL PERFOR A CE CHARACTERISTICS ±5V Large-Signal Response±5V Small-Signal ResponseOutput Overdriven Recovery2V/DIV0VVS = ±5VAV = 1RL = 1k200ns/DIVAPPLICATIO S I FOR ATIOCircuit DescriptionThe LT1800 has an input and output signal range thatcovers from the negative power supply to the positivepower supply. Figure 1 depicts a simplified schematic ofthe amplifier. The input stage is comprised of two differ-ential amplifiers, a PNP stage Q1/Q2 and an NPN stage Q3/Q4 that are active over the different ranges of commonmode input voltage. The PNP differential pair is activebetween the negative supply to approximately 1.2V belowV+V+V–ESDD2D1+I2+INESDD1D6D5–INESDD4V–Q16Q17Q18V+ESDD3D8D7Q19V–Figure 1. LT1800 Simplified Schematic Diagram 1800fUWUW1800 G3550mV/DIV0VVIN1V/DIV0VVOUT2V/DIV0VVS = ±5VAV = 1RL = 1k50ns/DIV1800 G36VS = 5V, 0VAV = 2RL = 1k100ns/DIV1800 G37UUthe positive supply. As the input voltage moves closertoward the positive supply, the transistor Q5 will steer thetail current I1 to the current mirror Q6/Q7, activating theNPN differential pair and the PNP pair becomes inactivefor the rest of the input common mode range up to thepositive supply. Also at the input stage, devices Q17 toQ19 act to cancel the bias current of the PNP input pair.When Q1-Q2 are active, the current in Q16 is controlled tobe the same as the current in Q1-Q2, thus the base currentR3R4R5+I1Q11Q12Q13C2Q15D2Q5VBIASCC+I3V–OUTQ4Q3Q1Q2D3Q10D4Q9Q8C1BUFFERANDOUTPUT BIASQ7Q6R1R21800 F01Q1411
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LT1800
APPLICATIO S I FOR ATIOof Q16 is nominally equal to the base current of the inputdevices. The base current of Q16 is then mirrored bydevices Q17-Q19 to cancel the base current of the inputdevices Q1-Q2.A pair of complementary common emitter stages Q14/Q15that enable the output to swing from rail to rail constructsthe output stage. The capacitors C2 and C3 form the localfeedback loops that lower the output impedance at highfrequency. These devices are fabricated on LinearTechnology’s proprietary high-speed complementary bi-polar process.Power DissipationThe LT1800 amplifier is offered in a small package, SOT-23,which has a thermal resistance of 250°C/W, θJA. So thereis a need to ensure that the die’s junction temperatureshould not exceed 150°C. Junction temperature TJ iscalculated from the ambient temperature TA, power dissi-pation PD and thermal resistance θJA:TJ = TA + (PD • θJA)The power dissipation in the IC is the function of the supplyvoltage, output voltage and the load resistance. For a givensupply voltage, the worst-case power dissipation PDMAXoccurs at the maximum supply current and the outputvoltage is at half of either supply voltage (or the maximumswing is less than 1/2 supply voltage). PDMAX is given by:PDMAX = (VS • ISMAX) + (VS/2)2/RLExample: An LT1800 in a SOT-23 package operating on±5V supplies and driving a 50Ω load, the worst-casepower dissipation is given by:PDMAX = (10 • 4mA) + (2.5)2/50 = 0.04 + 0.125 = 0.165WThe maximum ambient temperature that the part is al-lowed to operate is:TA = TJ – (PDMAX • 250°C/W) = 150°C – (0.165W • 250°C/W) = 108°CInput Offset VoltageThe offset voltage will change depending upon which inputstage is active. The PNP input stage is active from thenegative supply rail to 1.2V of the positive supply rail, then12
Uthe NPN input stage is activated for the remaining inputrange up to the positive supply rail during which the PNPstage remains inactive. The offset voltage is typically lessthan 75µV in the range that the PNP input stage is active.Input Bias CurrentThe LT1800 employs a patent-pending technique to trimthe input bias current to less than 250nA for the inputcommon mode voltage of 0.2V above negative supply railto 1.2V of the positive rail. The low input offset voltageand low input bias current of the LT1800 provide theprecision performance especially for high source imped-ance applications.OutputThe LT1800 can deliver a large output current, so theshort-circuit current limit is set around 50mA to preventdamage to the device. Attention must be paid to keep thejunction temperature of the IC below the absolute maxi-mum rating of 150°C (refer to the Power Dissipationsection) when the output is continuously short circuited.The output of the amplifier has reverse-biased diodesconnected to each supply. If the output is forced beyondeither supply, unlimited current will flow through thesediodes. If the current is transient and limited to severalhundred mA, and the total supply voltage is less than12.6V, the absolute maximum rating, no damage willoccur to the device.Overdrive ProtectionWhen the input voltage exceeds the power supplies, twopairs of crossing diodes D1 to D4 will prevent the outputfrom reversing polarity. If the input voltage exceeds eitherpower supply by 700mV, diode D1/D2 or D3/D4 will turnon to keep the output at the proper polarity. For the phasereversal protection to perform properly, the input currentmust be limited to less than 10mA. If the amplifier isseverely overdriven, an external resistor should be used tolimit the overdrive current.The LT1800’s input stages are also protected against alarge differential input voltage of 1.4V or higher by a pairof back-back diodes D5/D8 to prevent the emitter-basebreakdown of the input transistors. The current in these 1800f
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LT1800APPLICATIO S I FOR ATIOdiodes should be limited to less than 10mA when they areactive. The worst-case differential input voltage usuallyoccurs when the input is driven while the output is shortedto ground in a unity gain configuration. In addition, theamplifier is protected against ESD strikes up to 3kV on allpins by a pair of protection diodes on each pin that areconnected to the power supplies as shown in Figure1.Capacitive LoadThe LT1800 is optimized for high bandwidth, low powerand precision applications. It can drive a capacitive load ofabout 75pF in a unity gain configuration, and more forhigher gain. When driving a larger capacitive load, aresistor of 10Ω to 50Ω should be connected between theoutput and the capacitive load to avoid ringing or oscilla-tion. The feedback should still be taken from the output sothat the resistor will isolate the capacitive load to ensureAPPLICATIO S I FOR ATIOSingle Supply 1A Laser Driver AmplifierThe circuit in the front page of this data sheet shows theLT1800 used in a 1A laser driver application. One of thereasons the LT1800 is well suited to this control task is thatits 2.3V operation ensures that it will be awake duringpower-up and operated before the circuit can otherwisecause significant current to flow in the 2.1V threshold laserdiode. Driving the noninverting input of the LT1800 to avoltage VIN will control the turning on of the high currentNPN transistor, FMMT619 and the laser diode. A currentequal to VIN/R1 flows through the laser diode. The LT1800low offset voltage and low input bias current allows it tocontrol the current that flows through the laser diodeprecisely. The overall circuit is a 1A per Volt V-to-I con-verter. Frequency compensation components R2 and C1are selected for fast but zero-overshoot time domainresponse to avoid overcurrent conditions in the laser. Thetime domain response of this circuit, measured at R1 andgiven a 500mV 230ns input pulse, is also shown in thegraphic on the front page. While the circuit is capable of 1Aoperation, the laser diode and the transistor are thermallylimited due to power dissipation, so they must be operatedat low duty cycles.Ustability. Graphs on capacitive loads indicate the transientresponse of the amplifier when driving capacitive load witha specified series resistor.Feedback ComponentsWhen feedback resistors are used to set up gain, care mustbe taken to ensure that the pole formed by the feedbackresistors and the total capacitance at the inverting inputdoes not degrade stability. For instance, the LT1800 in anoninverting gain of 2, set up with two 5k resistors and acapacitance of 5pF (part plus PC board) will probably ringin transient response. The pole is formed at 12.7MHz thatwill reduce phase margin by 32 degrees when the cross-over frequency of the amplifier is around 20MHz. A capaci-tor of 5pF or higher connected across the feedback resis-tor will eliminate any ringing or oscillation.Fast 1A Current Sense AmplifierA simple, fast current sense amplifier in Figure 2 is suitablefor quickly responding to out-of-range currents. The cir-cuit amplifies the voltage across the 0.1Ω sense resistorby a gain of 20, resulting in a conversion gain of 2V/A. The–3dB bandwidth of the circuit is 4MHz, and the uncertaintydue to VOS and IB is less than 4mA. The minimum outputvoltage is 60mV, corresponding to 30mA. The large-signalresponse of the circuit is shown in Figure 3.IL0A TO 1A52.3Ω3VUWWUUUU+–LT1800VOUT0V TO 2V0.1Ω52.3Ω1k1800 F02VOUT = 2 • ILf–3dB = 4MHzUNCERTAINTY DUE TO VOS, IB < 4mAFigure 2. Fast 1A Current Sense 1800f13
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LT1800
TYPICAL APPLICATIO SSingle 3V Supply, 1MHz, 4th Order Butterworth FilterThe circuit shown in Figure 4 makes use of the low voltageoperation and the wide bandwidth of the LT1800 to createa DC accurate 1MHz 4th order lowpass filter powered froma 3V supply. The amplifiers are configured in the invertingmode for the lowest distortion and the output can swingrail-to-rail for maximum dynamic range. Figure 5 displaysthe frequency response of the filter. Stopband attenuationis greater than 100dB at 50MHz. With a 2.25VP-P, 250kHzinput signal, the filter has harmonic distortion products ofless than –85dBc. Worst case output offset voltage is lessthan 6mV.500mV/DIV0VVS = 3V50ns/DIVFigure 3. Current Sense Amplifier Large-Signal ResponseVIN909ΩVS/21800 F04GAIN (dB)14
U1800 F03909Ω2.67k220pF47pF–1.1k1.1k2.21k470pFLT180022pF3V–+LT1800VOUT+Figure 4. 3V, 1MHz, 4th Order Butterworth Filter0–20–40–60–80–100–1201k10k100k1MFREQUENCY (Hz)10M100M1800 F05Figure 5. Frequency Response of Filter 1800f元器件交易网www.cecb2b.com
LT1800PACKAGE DESCRIPTIODATUM ‘A’0.010 – 0.020× 45°(0.254 – 0.508)0.008 – 0.010(0.203 – 0.254)0.016 – 0.050(0.406 – 1.270)0°– 8° TYP0.014 – 0.019(0.355 – 0.483)TYP*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006\" (0.152mm) PER SIDE**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010\" (0.254mm) PER SIDEInformation furnished by Linear Technology Corporation is believed to be accurate and reliable.However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.US6 Package6-Lead Plastic TSOT-23(Reference LTC DWG # 05-08-1636)2.80 BSC1.50 – 1.75(NOTE 4)0.30 – 0.45 TYP 5 PLCS (NOTE 3)0.09 – 0.20(NOTE 3)S8 Package8-Lead Plastic Small Outline (Narrow .150 Inch)(Reference LTC DWG # 05-08-1610) 0.189 – 0.197*(4.801 – 5.004)0.053 – 0.069(1.346 – 1.752)80.004 – 0.010(0.101 – 0.254)0.228 – 0.244(5.791 – 6.197) 0.150 – 0.157**(3.810 – 3.988)7650.050(1.270)BSCSO8 12981234 1800f15
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LT1800
TYPICAL APPLICATIOLow Power High Voltage AmplifierCertain materials used in optical applications have charac-teristics that change due to the presence and strength ofa DC electric field. The voltage applied across thesematerials should be precisely controlled to maintain de-sired properties, sometimes as high as 100’s of volts. Thematerials are not conductive and represent a capacitiveload.The circuit of Figure 6 shows the LT1800 used in anamplifier capable of a 250V output swing and providing130V5V10k0.1µFQ54.99k5VQ1R42kQ2+R22k–LT1800R52kQ3Q4R72kVINR12kC28pF150VC139pFR3200k10kQ74.99kQ81k–130V1800 F06Figure 6. Low Power, High Voltage AmplifierRELATED PARTSPART NUMBERLT1399LT1498/LT1499LT1630/LT1631LT1801/LT1802LT1806/LT1807LT1809/LT1810DESCRIPTIONTriple 300MHz Current Feedback AmplifierDual/Quad 10MHz, 6Vµs Rail-to-Rail Input and Output C-LoadTMOp AmpsDual/Quad 30MHz, 10V/µs Rail-to-Rail Input and Output Op Amps80MHz, 25V/µs Low Power Rail-to-Rail Input/Output Precision Op AmpsSingle/Dual 325MHz, 140V/µs Rail-to-Rail Input and Output Op AmpsSingle/Dual 180MHz Rail-to-Rail Input/Output Op AmpsCOMMENTS0.1dB Gain Flatness to 150MHz, ShutdownHigh DC Accuracy, 475µV VOS(MAX), 4µV/°C Max Drift,Max Supply Current 2.2mA per AmpHigh DC Accuracy, 525µV VOS(MAX), 70mA Output Current,Max Supply Current 4.4mA per AmplifierDual/Quad Version of the LT1800High DC Accuracy, 550µV VOS(MAX), Low Noise 3.5nV/√Hz,Low Distortion –80dB at 5MHz, Power-Down (LT1806)350V/µs Slew Rate, Low Distortion –90dBc at 5MHz,Power-Down (LT1809)C-Load is a trademark of Linear Technology Corporation. 1800f16
Linear Technology Corporation1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507 q www.linear.comU1kQ6precise DC output voltage. When no signal is present, theop amp output sits at about mid-supply. Transistors Q1and Q3 create bias voltages for Q2 and Q4, which areforced into a low quiescent current by degeneration resis-tors R4 and R5. When a transient signal arrives at VIN, theop amp output moves and causes the current in Q2 or Q4to change depending on the signal polarity. The current,limited by the clipping of the LT1800 output and the 3kΩof total emitter degeneration, is mirrored to the outputdevices to drive the capacitive load. The LT1800 outputthen returns to near mid-supply, providing the precise DCoutput voltage to the load. The attention to limit the currentof the output devices minimizes power dissipation thusallowing for dense layout, and inherits better reliability.Figure 7 shows the time domain response of the amplifierproviding a 200V output swing into a 100pF load.5VR62kVOUTMATERIAL UNDERELECTRIC FIELD100pFVIN2V/DIVAV = VOUT/VIN = –100±130V SUPPLY IQ = 130µAOUTPUT SWING = ±128.8VOUTPUT OFFSET ≅ 20mVOUTPUT SHORT-CIRCUIT CURRENT ≅ 3mA10% TO 90% RISE TIME ≅ 8µs, 200V OUTPUT STEPSMALL-SIGNAL BANDWIDTH ≅ 150kHzQ1, Q2, Q7, Q8: ON SEMI MPSA42Q3, Q4, Q5, Q6: ON SEMI MPSA92VOUT50V/DIV10µs/DIV1800 F07Figure 7. Large-Signal Time DomainResponse of the Amplifier LT/TP 0402 2K • PRINTED IN USA
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