LT®1880 brings high accuracy input performance rail-to-rail output swi
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LT1880 SOT-23, Rail-to-Rail Output, Picoamp Input Current Precision DESCRIPTION
LT®1880 brings high accuracy input performance rail-to-rail output swing SOT-23 package. Input offset voltage trimmed less than 150V drift maintains this accuracy over operating temperature range. Input bias current ultralow 900pA maximum. amplifier works total power supply voltage between 2.7V (fully specified from ±15V). Output voltage swings within 55mV negative supply 250mV positive supply, which makes amplifier good choice voltage single supply operation. Slew rates 0.4V/s with supply current 1.2mA give superior response settling time performance power precision amplifier. LT1880 available 5-lead SOT-23 package.
LTC, LTM, Linear Technology Linear logo registered trademarks Linear Technology Corporation. ThinSOT trademark Linear Technology Corporation. other trademarks property their respective owners.
Offset Voltage: 150V Input Bias Current: 900pA Offset Voltage Drift: 1.2V/°C Rail-to-Rail Output Swing Operates with Single Split Supplies Open-Loop Voltage Gain: Million 1.2mA Supply Current Slew Rate: 0.4V/s Gain Bandwidth: 1.1MHz Noise: 13nV/Hz 1kHz Profile (1mm) ThinSOTPackage
APPLICATIONS
Thermocouple Amplifiers Bridge Transducer Conditioners Instrumentation Amplifiers Battery-Powered Systems Photocurrent Amplifiers
TYPICAL APPLICATION
Precision Photodiode Amplifier
39pF
Distribution Input Offset Voltage
PERCENT UNITS
100k,
LT1880 VOUT 0.1V/A
1880 TA01
320V OUTPUT OFFSET, WORST CASE OVER 70°C 60kHz BANDWIDTH 5.8s RISE TIME, 90%, 100mV OUTPUT STEP 52VRMS OUTPUT NOISE, MEASURED 100kHz ±1.5V ±18V SIEMENS INFINEON BPW21 PHOTODIODE (~580pF)
-140 -100
INPUT OFFSET VOLTAGE
1880 TA01b
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LT1880 ABSOLUTE MAXIMUM RATINGS
(Note
CONFIGURATION
VIEW
Supply Voltage .40V Differential Input Voltage (Note ±10V Input Voltage.V Input Current (Note ±10mA Output Short-Circuit Duration (Note Indefinite Operating Temperature Range (Note 40°C 85°C Specified Temperature Range (Note 40°C 85°C Maximum Junction Temperature 150°C Storage Temperature Range -65°C 150°C Lead Temperature (Soldering, sec). 300°C
PACKAGE 5-LEAD PLASTIC TSOT-23 TJMAX 150°C, 250°C/W
ORDER INFORMATION
LEAD FREE FINISH LT1880CS5#PBF LT1880IS5#PBF TAPE REEL LT1880CS5#TRPBF LT1880IS5#TRPBF PART MARKING LTUM LTVW PACKAGE DESCRIPTION 5-Lead Plastic TSOT-23 5-Lead Plastic TSOT-23 SPECIFIED TEMPERATURE RANGE 70°C -40°C 85°C
Consult Marketing parts specified with wider operating temperature ranges. Consult Marketing information non-standard lead based finish parts. more information lead free part marking, http://www.linear.com/leadfree/ more information tape reel specifications,
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. 2.5V unless otherwise noted. (Note
SYMBOL PARAMETER Input Offset Voltage 70°C -40°C 85°C Input Offset Voltage Drift (Note Input Offset Current 70°C -40°C 85°C Input Bias Current 70°C -40°C 85°C Input Noise Voltage Input Noise Voltage Density Input Noise Current Density Input Resistance Input Capacitance Input Voltage Range
ELECTRICAL CHARACTERISTICS
CONDITIONS
1200 1400 1200 1500
UNITS V/°C V/°C Vp-p nV/Hz pA/Hz
70°C -40°C 85°C
0.1Hz 10Hz 1kHz 1kHz Differential Common Mode, 3.8V 1.0)
0.07 1.2)
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LT1880 ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CMRR PSRR AVOL Common Mode Rejection Ratio Power Supply Rejection Ratio Minimum Operating Supply Voltage Large Signal Voltage Gain 10k; VOUT VOUT VOUT Output Voltage Swing Load ISINK 100A ISINK Load ISOURCE 100A ISOURCE FPBW Short-Circuit Current Gain-Bandwidth Product Settling Time Full Power Bandwidth (Note Total Harmonic Distortion Noise Slew Rate Positive Slew Rate Negative VOUT Short VOUT Short 20kHz 0.01%, VOUT 1.5V 3.5V VOUT 4VP-P 2VP-P, 1kHz, 22kHz 2VP-P, 1kHz, 10k, 22kHz
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. 2.5V unless otherwise noted. (Note
CONDITIONS 3.8V
UNITS
1.5V; 2.7V
V/mV V/mV V/mV V/mV V/mV V/mV
1600 1.35
Output Voltage Swing High (Referred Supply Current Amplifier
0.002 0.0008
0.25 0.25 0.25
0.55
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. ±15V, unless otherwise noted. (Note
SYMBOL PARAMETER Input Offset Voltage 70°C -40°C 85°C Input Offset Voltage Drift (Note Input Offset Current 70°C -40°C 85°C Input Bias Current 70°C -40°C 85°C Input Noise Voltage 0.1Hz 10Hz 70°C -40°C 85°C CONDITIONS
1200 1400 1200 1500
UNITS V/°C V/°C V/p-p
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LT1880 ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CMRR +PSRR -PSRR Input Noise Voltage Density Input Noise Current Density Input Resistance Input Capacitance Input Voltage Range Common Mode Rejection Ratio Positive Power Supply Rejection Ratio Negative Power Supply Rejection Ratio Minimum Operating Supply Voltage AVOL Large Signal Voltage Gain 10k; -13.5V VOUT 13.5V -13.5V VOUT 13.5V Output Voltage Swing (Referred VEE) Output Voltage Swing High (Referred VCC) Supply Current Amplifier Short-Circuit Current VOUT Short VOUT Short FPBW Full Power Bandwidth (Note Gain Bandwidth Product Total Harmonic Distortion Noise Slew Rate Positive Slew Rate Negative VOUT 14VP-P 20kHz 25VP-P, 100kHz, 10k, 22kHz 25VP-P, 100kHz, 10k, 22kHz
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. 15V; unless otherwise noted. (Note
CONDITIONS 1kHz 1kHz Differential Common Mode, -13.5V 13.5V -13.5 ±1.2 1000 1600 1000 0.00029 0.00029 0.25 0.25 0.55 ±1.35 0.07 13.5 -13.5V 13.5V -15V, 1.5V 15V, -1.5V -18V
UNITS nV/Hz pA/Hz V/mV V/mV V/mV V/mV
Load ISINK 100A ISINK Load ISINK 100A ISINK
Note Stresses beyond those listed under Absolute Maximum Ratings cause permanent damage device. Exposure Absolute Maximum Rating condition extended periods affect device reliability lifetime. Note inputs protected back-to-back diodes. differential input voltage exceeds 10V, Application Information, input current should limited less than 10mA. Note heat sink required keep junction temperature below absolute maximum ratings.
Note LT1880C LT1880I guaranteed functional over operating temperature range -40°C 85°C. Note LT1880C guaranteed meet specified performance from 70°C designed, characterized expected meet specified performance from -40°C 85°C tested sampled these temperatures. LT1880I guaranteed meet specified performance from -40°C 85°C. Note This parameter 100% tested. Note Full power bandwidth calculated from slew rate. FPBW SR/(2VP)
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LT1880 TYPICAL PERFORMANCE CHARACTERISTICS
Input Offset Voltage Temperature
INPUT OFFSET VOLTAGE -100 -150 -200 TEMPERATURE (°C)
1880
Input Bias Current Common Mode Voltage
1000 INPUT BIAS CURRENT (pA) -200 -400 -600 -800
25°C -40°C 85°C
Input Bias Current Common Mode Near
1000 INPUT BIAS CURRENT (pA) ±15V
TEMPCO: -55°C 125°C REPRESENTATIVE UNITS
-500 -45°C 25°C 85°C
±15V -1000 COMMON MODE VOLTAGE
1880
-1000 13.0
13.8 14.2 13.4 COMMON MODE VOLTAGE
14.6
1880 G02A
Input Bias Current Common Mode Near
1000 ±15V INPUT BIAS CURRENT (pA) -100 -150 -200 -250
Input Bias Current Temperature
±15V
Output Voltage Swing Load Current
OUTPUT VOLTAGE SWING (V+) -40°C -0.5 -1.0 -1.5 -40°C OUTPUT CURRENT (mA) 25°C 85°C 85°C 25°C
INPUT BIAS CURRENT (pA)
-500
-1000 -14.6
-40°C 25°C 85°C -13.0
1880 G02B
-13.8 -14.2 -13.4 COMMON MODE VOLTAGE
-300
TEMPERATURE (°C)
1880
OUTPUT VOLTAGE SWING (V-)
1880
Warm Drift
OFFSET VOLTAGE CHANGE ±2.5V ±15V 25°C 1000 CURRENT NOISE DENSITY (fA/Hz) VOLTAGE NOISE DENSITY (nV/Hz)
Frequency
±15V 25°C CURRENT NOISE NOISE VOLTAGE (0.2V/DIV)
10Hz Noise
VOLTAGE NOISE
TIME AFTER POWER (MIN)
1880
±15V 25°C FREQUENCY (Hz)
1880
TIME (SEC)
1880 G09a
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LT1880 TYPICAL PERFORMANCE CHARACTERISTICS
0.01 Noise
NOISE VOLTAGE (0.2V/DIV) GAIN (dB) ±15V 25°C TIME (SEC)
1880 G09b
Gain Frequency
POWER SUPPLY REJECTION RATIO (dB) ±15V
PSRR Frequency
±15V
-PSRR FREQUENCY (Hz) 100k
1880
+PSRR
100k FREQUENCY (Hz)
1880
CMRR Frequency
POWER SUPPLY REJECTION RATIO (dB) VOLTAGE GAIN (dB) FREQUENCY (Hz) 100k ±15V
Gain Phase Frequency
±15V OUTPUT STEP PHASE SHIFT GAIN 100k FREQUENCY (Hz) -100
1880
Settling Time Output Step
SETTLING TIME 0.1% 0.01% PHASE SHIFT (DEG) ±15V 0.1% 0.01%
1880
1880
Settling Time Output Step
SLEW RATE (V/s) OUTPUT STEP GAIN BANDWIDTH PRODUCT (MHz) SETTLING TIME 0.1% 0.01% 1.14 ±15V 0.1% 0.01%
Slew Rate, Gain-Bandwidth Product Phase Margin Temperature
±15V SLEW RATE PHASE MARGIN (DEG)
Slew Rate, Gain-Bandwidth Product Phase Margin Power Supply
SLEW RATE (V/s) 25°C
SLEW RATE
PHASE MARGIN (DEG)
GAIN BANDWIDTH PRODUCT (MHz)
1.12 1.11
1.12
1.10
TEMPERATURE (°C)
1880
1.10 POWER SUPPLY (±V) 12.5
1880
1880
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LT1880 TYPICAL PERFORMANCE CHARACTERISTICS
Gain Frequency with CLOAD,
Gain Frequency with CLOAD,
Output Impedance Frequency
±15V
1000pF GAIN (dB) GAIN (dB) 500pF
500pF
OUTPUT IMPEDANCE
1000pF
100k FREQUENCY (Hz)
100M
1880
100k FREQUENCY (Hz)
100M
1880
0.01 0.01
FREQUENCY (MHz)
1880 G17A
Total Harmonic Distortion Noise Frequency
2.5V VOUT (20mV/DIV)
Small Signal Response
Small Signal Response
NOISE
VOUT (20mV/DIV)
0.01 0.001 0.0001 FREQUENCY (Hz) 100k
1880 G17B
LOAD
TIME (2s/DIV)
1880
LOAD
TIME (2s/DIV)
1880
Small Signal Response
Large Signal Response
Large Signal Response
VOUT (20mV/DIV)
VOUT (5V/DIV)
VOUT (5V/DIV)
500pF
TIME (2s/DIV)
1880
TIME (50s/DIV)
1880
TIME (50s/DIV)
1880
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LT1880 APPLICATIONS INFORMATION
LT1880 single features exceptional input precision with rail-to-rail output swing. Slew rate small signal bandwidth superior other amplifiers with comparable input precision. These characteristics make LT1880 convenient choice precision voltage systems improved performance higher voltage precision systems. Obtaining beneficial advantage precision inherent amplifier depends upon proper applications circuit design board layout. Preserving Input Precision Preserving input voltage accuracy LT1880 requires that applications circuit board layout introduce errors comparable greater than offset. Temperature differentials across input connections generate thermocouple voltages 10's microvolts. board layouts should keep connections amplifier's input pins close together away from heat dissipating components. currents across board also generate temperature differentials. extremely input bias currents, 150pA, allow high accuracy maintained with high impedance sources feedback networks. LT1880's input bias currents obtained using cancellation circuit on-chip. This causes resulting IBIAS+ IBIAS- uncorrelated, implied specification being comparable IBIAS. user should balance input resistances each input lead, commonly recommended with most amplifiers. impedance either input should kept small possible minimize total circuit error. board layout important insure that leakage currents corrupt IBIAS amplifier. high precision, high impedance circuits, input pins should surrounded guard ring board interconnect, with guard driven same common mode voltage amplifier inputs. Input Common Mode Range LT1880 output able swing nearly each power supply rail, input stage limited operating between 1.2V. Exceeding this common mode range will cause gain drop zero, however gain reversal will occur. Input Protection inverting noninverting input pins LT1880 have limited on-chip protection. protection provided prevent damage during handling. input transistors have voltage clamping limiting resistors protect against input differentials 10V. Short transients above this level will also tolerated. input pins sustained differential voltage above 10V, external limiting resistors should used prevent damage amplifier. resistor each input lead will provide protection against differential voltage. Capacitive Loads LT1880 drive capacitive loads 600pF unity gain. capacitive load driving capability increases amplifier used higher gain configurations, graph labled Capacitive Load Response. Capacitive load driving increased decoupling capacitance from output with small resistance.
Capacitance Load Response
OVERSHOOT ±15V 25°C
1000 CAPACITIVE LOAD (pF) 10000
1880
Getting Rail-to-Rail Operation without Rail-to-Rail Inputs LT1880 does have rail-to-rail inputs, most inverting applications noninverting gain applications, this largely inconsequential. Figure shows basic configurations, what happens inputs, whether must have railto-rail inputs.
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LT1880 APPLICATIONS INFORMATION
VREF
VREF INVERTING: INPUTS MOVE, FIXED BIAS POINT VREF INPUT DOES HAVE RAIL-TO-RAIL NONINVERTING: INPUTS MOVE MUCH VIN, OUTPUT MOVES MORE INPUT HAVE RAIL-TO-RAIL NONINVERTING: INPUTS MOVE MUCH OUTPUT INPUT MUST RAIL-TO-RAIL OVERALL CIRCUIT RAIL-TO-RAIL PERFORMANCE
1880
Figure Some Configurations Require Rail-to Rail Inputs Achieve Rail-to-Rail Outputs
circuit Figure shows extreme example inverting case. input voltage resistor swing ±13.5V LT1880 will output inverted, divided-by-ten version input voltage. input accuracy limited resistors 0.2%. Output referred, this error becomes 2.7mV. input offset voltage contribution, plus additional error input bias current times ~100k effective source impedance, contribute only negligibly error.
1.5V ±13.5V SWINGS WELL OUTSIDE SUPPLY RAILS ±1.35V OUTPUT SWING
Precision Photodiode Amplifier Photodiode amplifiers usually employ JFET amps because their bias current; however, when precision required, JFET amps generally inadequate their relatively high input offset voltage drift. LT1880 provides high degree precision with very bias current 150pA typical) therefore applicable this demanding task. Figure shows LT1880 configured transimpedance photodiode amplifier.
WORST-CASE OUTPUT OFFSET 196V 25°C 262V 70°C 323V -40°C 85°C
LT1880 0.1%
51.1k
100k, 0.1% -1.5V
1880
PHOTODIODE (SEE TEXT)
Figure Extreme Inverting Case: Circuit Operates Properly with Input Voltage Swing Well Outside Supply Rails.
Figure Precision Photodiode Amplifier
1880
LT1880
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LT1880 APPLICATIONS INFORMATION
transimpedance gain 51.1k feedback capacitor, large desired where response time issue, selected maximally flat response highest possible bandwidth given photodiode capacitance Figure shows chart rise time versus maximally flat response. Total output offset below 262V, worst-case, over temperature (0°C 70°C). With output swing, this guarantees minimum 86dB dynamic range over temperature (0°C 70°C), full-scale photodiode current 98A. Single-Supply Current Source Platinum precision, bias current input stage LT1880 makes ideal precision integrators current sources. Figure shows LT1880 providing simple precision current source remote 4-wire
connection. LT1634 reference places 1.25V noninverting input LT1880, which then maintains inverting input same voltage driving current through total 1.25k resistance Imprecise components ensure circuit stability, which would otherwise excessively dependant cable characteristics. also noncritical included improve immunity decouple cable capacitance from LT1880's output. 4-wire cable allows Kelvin sensing voltage while excluding cable drops from voltage reading. With excitation, will have across 0°C, +3.85mV/°C temperature response. This voltage easily read myriad ways, with best method depending temperature region emphasized particular that will reading voltage.
180,
RISE TIME (s), (pF)
RTD*
VOUT 1.00V 3.85mV/°C -50°C 600°C 0.1F
RISE TIME 100mV OUTPUT STEP (pF) 1000
1880
Figure Feedback Rise Time Photodiode
150k, LT1634ACS8 -1.25
*OMEGA F3141 0.1% PLATINUM
Figure Single Supply Current Source Platinum
(800) 826-6342
1880
1.24K 0.1%
LT1880
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LT1880 SIMPLIFIED SCHEMATIC
1880
100A
RCM1
RCM2
PACKAGE DESCRIPTION
0.62 0.95
Package 5-Lead Plastic TSOT-23
(Reference 05-08-1635)
2.90 (NOTE
1.22
3.85 2.62
2.80
1.50 1.75 (NOTE
RECOMMENDED SOLDER LAYOUT CALCULATOR 0.30 0.45 PLCS (NOTE
0.95 0.80 0.90
0.20 1.00 DATUM
0.01 0.10
0.30 0.50
NOTE: DIMENSIONS MILLIMETERS DRAWING SCALE DIMENSIONS INCLUSIVE PLATING
0.09 0.20 (NOTE
1.90
TSOT-23 0302
DIMENSIONS EXCLUSIVE MOLD FLASH METAL BURR MOLD FLASH SHALL EXCEED 0.254mm JEDEC PACKAGE REFERENCE MO-193
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Information furnished Linear Technology Corporation believed accurate reliable. However, responsibility assumed use. Linear Technology Corporation makes representation that interconnection circuits described herein will infringe existing patent rights.
LT1880 TYPICAL APPLICATION
SOT-23 JFET Input Transimpedance Photodiode Amplifier
1.2pF 100k, 1.2pF TIME DOMAIN RESPONSE TRIM
220k, 0.01F
LT1880
220k,
0.1F
LT1806 VOUT
0.01F
SEMI MMBF4416 JFET N1:ON SEMI MMBT3904 SIEMENS/INFINEON SFH213FA PHOTODIODE (~3pF) VSUPPLY BANDWIDTH 7MHz NOISE FIGURE 100kHz, 25°C 100k 1880 TA02
RELATED PARTS
PART NUMBER LT1782 LT1792 LT1881/LT1882 LTC2050 LT6010 DESCRIPTION Rugged, General Purpose SOT-23 Noise JFET Dual/Quad Precision Amps Zero Drift SOT-23 135A Rail-to-Rail Output Precision COMMENTS Rail-to-Rail 4.2nV/Hz VOS(MAX), 200pA IB(MAX) Rail-to-Rail Output VOS(MAX), Rail-to-Rail Output Lower Power Version LT1880
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Linear Technology Corporation
(408) 432-1900 FAX: (408) 434-0507
0909 PRINTED
1630 McCarthy Blvd., Milpitas, 95035-7417
www.linear.com
LINEAR TECHNOLOGY CORPORATION 2009
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