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LT1167 Single Resistor Gain Programmable, Precision Instrumentation Amplifier
®1167 power, precision instrumentation amplifier that requires only external resistor gains 10,000. voltage noise 7.5nV/Hz 1kHz) compromised power dissipation (0.9mA typical ±2.3V ±15V supplies). high accuracy 10ppm maximum nonlinearity 0.08% gain error degraded even load resistors (previous monolithic instrumentation amps used their nonlinearity specifications). LT1167 laser trimmed very input offset voltage (40µV max), drift (0.3µV/°C), high CMRR (90dB, PSRR (105dB, input bias currents 350pA achieved with superbeta processing. output handle capacitive loads 1000pF gain configuration while inputs protected 13kV (human body). LT1167 with external resistors passes 1000-4-2 level specification. LT1167, offered 8-pin PDIP packages, requires significantly less board area than discrete multi resistor designs. These advantages make LT1167 most cost effective solution precision instrumentation amplifier applications.
registered trademarks Linear Technology Corporation.
Single Gain Resistor: 10,000 Gain Error: 0.08% Gain Nonlinearity: 10ppm Input Offset Voltage: 60µV Input Offset Voltage Drift: 0.3µV/°C Input Bias Current: 350pA PSRR 105dB CMRR 90dB Supply Current: 1.3mA Wide Supply Range: ±2.3V ±18V 1kHz Voltage Noise: 7.5nV/Hz 0.1Hz 10Hz Noise: 0.28µVP-P Available 8-Pin PDIP Packages Meets 1000-4-2 Level Tests with External Resistors
APPLICATIONS
Bridge Amplifiers Strain Gauge Amplifiers Thermocouple Amplifiers Differential Single-Ended Converters Medical Instrumentation
TYPICAL APPLICATION
Single Supply Barometer
392k LT1634CCZ-1.25
LT1167 4-DIGIT
RSET
LT1490
100k
0.2% ACCURACY 25°C 1.2% ACCURACY 60°C
NONLINEARITY (100ppm/DIV)
LT1490
LUCAS NOVA SENOR NPC-1220-015-A-3L
VOLTS 2.800 3.000 3.200
INCHES 28.00 30.00 32.00
1167 TA01
Gain Nonlinearity
1167 TA02
1000 VOUT ±10V
OUTPUT VOLTAGE (2V/DIV)
LT1167
ABSOLUTE MAXIMUM RATINGS
(Note
PACKAGE/ORDER INFORMATION
ORDER PART NUMBER
VIEW PACKAGE 8-LEAD PDIP PACKAGE 8-LEAD PLASTIC
TJMAX 150°C, 130°C/ (N8) TJMAX 150°C, 190°C/ (S8)
Supply Voltage ±20V Differential Input Voltage (Within Supply Voltage) ±40V Input Voltage (Equal Supply Voltage) ±20V Input Current (Note ±20mA Output Short-Circuit Duration Indefinite Operating Temperature Range 40°C 85°C Specified Temperature Range LT1167AC/LT1167C (Note 70°C LT1167AI/LT1167I 40°C 85°C Storage Temperature Range 65°C 150°C Lead Temperature (Soldering, sec). 300°C
OUTPUT
LT1167ACN8 LT1167ACS8 LT1167AIN8 LT1167AIS8 LT1167CN8 LT1167CS8 LT1167IN8 LT1167IS8 PART MARKING 1167A 1167AI 1167 1167I
Consult factory Military grade parts.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER Gain Range Gain Error (49.4k/RG) (Note (Note 1000 (Note
±15V, 25°C, unless otherwise noted.
LT1167AC/LT1167AI 0.008 0.010 0.025 0.040 0.02 0.08 0.08 0.10 LT1167C/LT1167I 0.015 0.020 0.030 0.040 0.03 0.10 0.10 0.10 UNITS
CONDITIONS (Note
Gain Nonlinearity (Note
±10V, ±10V, ±10V, 1000 ±10V, ±10V, 100, ±10V, 1000,
VOST VOSI VOSO
Total Input Referred Offset Voltage VOST VOSI VOSO/G Input Offset Voltage Output Offset Voltage Input Offset Current Input Bias Current Input Noise Voltage, 0.1Hz 10Hz, 0.1Hz 10Hz, 0.1Hz 10Hz, 1000 1kHz 1kHz (Note 1000, ±15V ±15V 2.00 0.50 0.28 2.00 0.50 0.28 µVP-P µVP-P µVP-P nV/Hz nV/Hz
Total Noise (eno /G)2 Input Noise Voltage Density, Output Noise Voltage Density,
LT1167
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CIN(DIFF) CIN(CM) Input Noise Current Input Noise Current Density Input Resistance Differential Input Capacitance Common Mode Input Capacitance Input Voltage Range CONDITIONS (Note 0.1Hz 10Hz 10Hz ±10V 100kHz 100kHz Other Input Grounded ±2.3V ±18V Source Imbalance, ±10V 1000 ±2.3 ±18V 1000 ±2.3V ±18V ±2.3V ±18V 1000 VOUT ±10V Step 1000 VREF 0.75 1000 0.0001 0.75
±15V, 25°C, unless otherwise noted.
LT1167AC/LT1167AI 1000 LT1167C/LT1167I 1000 UNITS pAP-P fA/Hz
CMRR
Common Mode Rejection Ratio
1000 0.0001
V/µs
PSRR
Power Supply Rejection Ratio
VOUT
Supply Current Output Voltage Swing
IOUT
Output Current Bandwidth
Slew Rate Settling Time 0.01%
RREFIN IREFIN VREF AVREF
Reference Input Resistance Reference Input Current Reference Voltage Range Reference Gain Output
LT1167
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER Gain Error (Note (Note 1000 (Note VOUT ±10V, VOUT ±10V, VOUT ±10V, 1000 1000 (Note VOST VOSI VOSO/G ±15V (Notes ±15V (Notes (Note (Note
±15V, 70°C, unless otherwise noted.
CONDITIONS (Note
LT1167AC 0.01 0.08 0.09 0.14 0.03 0.30 0.30 0.33
LT1167C 0.012 0.100 0.120 0.140 0.04 0.33 0.33 0.35
UNITS ppm/°C
Gain Nonlinearity
VOST VOSI VOSIH VOSO VOSOH VOSI/T VOSO/T IOS/T IB/T
Gain Temperature Total Input Referred Offset Voltage Input Offset Voltage Input Offset Voltage Hysteresis Output Offset Voltage Output Offset Voltage Hysteresis Input Offset Drift (RTI) Output Offset Drift Input Offset Current Input Offset Current Drift Input Bias Current Input Bias Current Drift Input Voltage Range
0.05
0.06
µV/°C µV/°C pA/°C pA/°C
Other Input Grounded ±2.3V ±18V Source Imbalance, ±10V 1000 ±2.3V ±18V 1000 ±2.3V ±18V ±2.3V ±18V VOUT ±10V (Note
CMRR
Common Mode Rejection Ratio
-1.3
V/µs
PSRR
Power Supply Rejection Ratio
VOUT
Supply Current Output Voltage Swing
0.65
0.65
IOUT VREF
Output Current Slew Rate Voltage Range
LT1167
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER Gain Error (Note (Note 1000 (Note
±15V, 40°C 85°C, unless otherwise noted. (Note
CONDITIONS (Note
LT1167AI 0.014 0.130 0.140 0.160 0.04 0.40 0.40 0.40
LT1167I 0.015 0.140 0.150 0.180 0.05 0.42 0.42 0.45
UNITS ppm/°C
Gain Nonlinearity (Notes
±10V, ±10V, ±10V, 1000 1000 (Note VOST VOSI VOSO/G
VOST VOSI VOSIH VOSO VOSOH VOSI VOSO/T IOS/T IB/T CMRR
Gain Temperature Total Input Referred Offset Voltage Input Offset Voltage Input Offset Voltage Hysteresis Output Offset Voltage
(Notes
0.05
0.06
µV/°C µV/°C pA/°C pA/°C
Output Offset Voltage Hysteresis (Notes Input Offset Drift (RTI) Output Offset Drift Input Offset Current Input Offset Current Drift Input Bias Current Input Bias Current Drift Input Voltage Range Common Mode Rejection Ratio ±2.3V ±18V Source Imbalance, ±10V 1000 ±2.3V ±18V 1000 ±2.3V ±18V VOUT ±10V (Note (Note (Note
0.55
0.95
0.55
0.95
V/µs
PSRR
Power Supply Rejection Ratio
VOUT IOUT VREF
Supply Current Output Voltage Swing Output Current Slew Rate Voltage Range
denotes specifications that apply over full specified temperature range. Note Absolute Maximum Ratings those values beyond which life device imparied. Note Does include effect external gain resistor Note This parameter 100% tested. Note LT1167AC/LT1167C designed, characterized expected meet industrial temperature limits, tested 40°C 85°C. I-grade parts guaranteed. Note This parameter measured high speed automatic tester that does measure thermal effects with longer time constants.
magnitude these thermal effects dependent package used, heat sinking flow conditions. Note Hysteresis offset voltage created package stress that differs depending whether previously higher lower temperature. Offset voltage hysteresis always measured 25°C, cycled 85°C I-grade 70°C C-grade) 40°C I-grade (0°C C-grade) before successive measurement. parts will pass typical limit data sheet. Note Typical parameters defined yield parameter distribution.
LT1167 TYPICAL PERFOR CHARACTERISTICS
Gain Nonlinearity,
NONLINEARITY (10ppm/DIV) NONLINEARITY (1ppm/DIV)
OUTPUT VOLTAGE (2V/DIV) VOUT ±10V
1167
OUTPUT VOLTAGE (2V/DIV) VOUT ±10V
1167
NONLINEARITY (10ppm/DIV)
Gain Nonlinearity, 1000
NONLINEARITY (100ppm/DIV)
NONLINEARITY (ppm)
1000 TEMPERATURE (°C)
GAIN ERROR
1000 OUTPUT VOLTAGE (2V/DIV) VOUT ±10V
Distribution Input Offset Voltage, 40°C
PERCENT UNITS
±15V 1000
LOTS) LOTS) TOTAL PARTS
PERCENT UNITS
INPUT OFFSET VOLTAGE (µV)
1167
PERCENT UNITS
1167
Gain Nonlinearity,
Gain Nonlinearity,
OUTPUT VOLTAGE (2V/DIV) VOUT ±10V
1167
Gain Nonlinearity Temperature
VOUT
0.20 0.15 0.10 0.05
Gain Error Temperature
0.05 0.10 0.15 ±15V VOUT ±10V 100* *DOES INCLUDE 1000* TEMPERATURE EFFECTS TEMPERATURE (°C)
0.20
1167
1167
Distribution Input Offset Voltage, 25°C
±15V 1000 LOTS) LOTS) TOTAL PARTS INPUT OFFSET VOLTAGE (µV)
1167
Distribution Input Offset Voltage, 85°C
±15V 1000 LOTS) LOTS) TOTAL PARTS
INPUT OFFSET VOLTAGE (µV)
1167
LT1167 TYPICAL PERFOR CHARACTERISTICS
Distribution Output Offset Voltage, 40°C
LOTS) LOTS) TOTAL PARTS ±15V
PERCENT UNITS
PERCENT UNITS
-400 -300 -200 -100 OUTPUT OFFSET VOLTAGE (µV)
1167
-150 -100 OUTPUT OFFSET VOLTAGE (µV)
1167
PERCENT UNITS
Distribution Input Offset Voltage Drift
±15V 40°C 85°C 1000 LOTS) LOTS) TOTAL PARTS
CHANGE OFFSET VOLTAGE (µV)
PERCENT UNITS
PERCENT UNITS
INPUT OFFSET VOLTAGE (µV)
Input Bias Current
±15V 25°C TOTAL PARTS
PERCENT UNITS
INPUT BIAS OFFSET CURRENT (pA)
PERCENT UNITS
INPUT BIAS CURRENT (pA)
1167
Distribution Output Offset Voltage, 25°C
LOTS) LOTS) TOTAL PARTS ±15V
Distribution Output Offset Voltage, 85°C
LOTS) LOTS) TOTAL PARTS -400 -300 -200 -100 OUTPUT OFFSET VOLTAGE (µV)
1167
±15V
Distribution Output Offset Voltage Drift
OUTPUT OFFSET VOLTAGE (µV) ±15V 40°C 85°C LOTS) LOTS) TOTAL PARTS
Warm-Up Drift
25°C
TIME AFTER POWER (MINUTES)
1167
1167
Input Offset Current
±15V 25°C TOTAL PARTS
Input Bias Offset Current Temperature
±15V
1167
INPUT OFFSET CURRENT (pA)
1167
TEMPERATURE (°C)
1167
LT1167 TYPICAL PERFOR CHARACTERISTICS
Input Bias Current Common Mode Input Voltage
COMMON MODE REJECTION RATIO (dB)
FREQUENCY (Hz) 1000
NEGATIVE POWER SUPPLY REJECTION RATIO (dB)
INPUT BIAS CURRENT (pA)
-100 COMMON MODE INPUT VOLTAGE
1167
85°C 40°C
70°C
25°C
Positive Power Supply Rejection Ratio Frequency
POSITIVE POWER SUPPLY REJECTION RATIO (dB)
FREQUENCY (Hz)
25°C 1000
SUPPLY CURRENT (mA)
GAIN (dB)
Voltage Noise Density Frequency
1000
VOLTAGE NOISE DENSITY (nVHz)
±15V 25°C 1/fCORNER 10Hz GAIN 1/fCORNER GAIN 1/fCORNER
NOISE VOLTAGE (2µV/DIV)
GAIN 100, 1000
LIMIT GAIN 1000 FREQUENCY (Hz) 100k
1167
TIME (SEC)
NOISE VOLTAGE (0.2µV/DIV)
Common Mode Rejection Ratio Frequency
±15V 25°C SOURCE IMBALANCE
Negative Power Supply Rejection Ratio Frequency
1000 25°C
100k
1167
FREQUENCY (Hz)
100k
1167
Gain Frequency
25°C FREQUENCY (kHz) 1000
1167
Supply Current Supply Voltage
1.50
1000
1.25 85°C 1.00 25°C 40°C 0.75
100k
1167
0.01
0.50
SUPPLY VOLTAGE
1167
0.1Hz 10Hz Noise Voltage,
±15V 25°C
0.1Hz 10Hz Noise Voltage, 1000
±15V 25°C
TIME (SEC)
1167
1167
LT1167 TYPICAL PERFOR CHARACTERISTICS
Current Noise Density Frequency
1000
CURRENT NOISE DENSITY (fA/Hz)
OUTPUT CURRENT (mA) (SINK) (SOURCE)
CURRENT NOISE (5pA/DIV)
FREQUENCY (Hz) 1000
1167
Overshoot Capacitive Load
OVERSHOOT
±15V VOUT 50mV 20mV/DIV 5V/DIV
1000 CAPACITIVE LOAD (pF) 10000
1167
Output Impedance Frequency
1000 25°C 1000
OUTPUT IMPEDANCE
20mV/DIV 5V/DIV
±15V 60pF 10µs/DIV
1167
FREQUENCY (kHz) 1000
1167
±15V 25°C
0.1Hz 10Hz Current Noise
±15V 25°C
Short-Circuit Current Time
±15V 40°C 25°C 85°C
85°C 40°C 25°C
TIME (SEC)
TIME FROM OUTPUT SHORT GROUND (MINUTES)
1167
1167
Large-Signal Transient Response
Small-Signal Transient Response
±15V 60pF
10µs/DIV
1167
±15V 60pF
10µs/DIV
1167
Large-Signal Transient Response
Small-Signal Transient Response
±15V 60pF
10µs/DIV
1167
LT1167 TYPICAL PERFOR CHARACTERISTICS
Undistorted Output Swing Frequency
PEAK-TO-PEAK OUTPUT SWING 100, 1000 FREQUENCY (kHz) 1000
1167
20mV/DIV
5V/DIV
Settling Time Gain
1000 25°C VOUT 0.01%
SETTLING TIME (µs)
5V/DIV
GAIN (dB)
1167
1000
1000 ±15V 60pF
50µs/DIV
1167
20mV/DIV
Settling Time Step Size
25°C 30pF
0.1%
OUTPUT VOLTAGE SWING (REFERRED SUPPLY VOLTAGE)
0.01%
SLEW RATE (V/µs)
OUTPUT STEP
0.01%
0.1% SETTLING TIME (µs)
1167
25°C
Large-Signal Transient Response
Small-Signal Transient Response
±15V 60pF
10µs/DIV
1167
±15V 60pF
10µs/DIV
1167
Large-Signal Transient Response
Small-Signal Transient Response
1000 ±15V 60pF
50µs/DIV
1167
Slew Rate Temperature
VOUT ±10V
Output Voltage Swing Load Current
0.01 OUTPUT CURRENT (mA)
1167
85°C 25°C 40°C SOURCE
VOUT
SLEW SLEW
VOUT
SINK
TEMPERATURE (°C)
1167
LT1167
BLOCK DIAGRAM
OUTPUT
24.7k
24.7k PREAMP STAGE DIFFERENCE AMPLIFIER STAGE
Figure Block Diagram
THEORY OPERATIO
LT1167 modified version three instrumentation amplifier. Laser trimming monolithic construction allow tight matching tracking circuit parameters over specified temperature range. Refer block diagram (Figure understand following circuit description. collector currents trimmed minimize offset voltage drift, thus assuring high level performance. trimmed absolute value 24.7k assure that gain accurately (0.05% 100) with only external resistor value parallel with (R2) determines transconductance preamp stage. reduced larger programmed gains, transconductance input preamp stage increases that input transistors This increases open-loop gain when programmed gain increased, reducing input referred gain related errors noise. input voltage noise gains greater than determined only lower gains noise difference amplifier preamp gain setting resistors increase noise. gain bandwidth product determined preamp transconductance which increases
with programmed gain. Therefore, bandwidth does drop proportional gain. input transistors offer excellent matching, which inherent bipolar transistors, well picoampere input bias current superbeta processing. collector currents held constant feedback through Q1-A1-R1 loop Q2-A2-R2 loop which turn impresses differential input voltage across external gain resistor Since current that flows through also flows through ratios provide gained-up differential voltage,G R2)/RG, unity-gain difference amplifier common mode voltage removed resulting single-ended output voltage referenced voltage pin. resulting gain equation VOUT VREF G(VIN+ VIN-) where: (49.4k solving gain resistor gives: 49.4k
1167
LT1167
THEORY OPERATIO
Input Output Offset Voltage offset voltage LT1167 components: output offset input offset. total offset voltage referred input (RTI) found dividing output offset programmed gain adding input offset. high gains input offset voltage dominates, whereas gains output offset voltage dominates. total offset voltage Total input offset voltage (RTI) input offset (output offset/G) Total output offset voltage (RTO) (input offset output offset Reference Terminal reference terminal four resistors around difference amplifier. output voltage LT1167 (Pin referenced voltage reference terminal (Pin Resistance series with must minimized best common mode rejection. example, resistance from ground will only increase gain error 0.02% will lower CMRR 80dB. Single Supply Operation single supply operation, same potential negative supply (Pin provided output instrumentation amplifier remains inside specified operating range that inputs least 2.5V above ground. barometer application front page this data sheet example that satisfies these conditions. resistance from bridge transducer ground sets operating current bridge also effect raising input common mode voltage. output LT1167 always inside specified range since barometric pressure rarely goes enough cause output rail (30.00 inches corresponds 3.000V). applications that require output swing below potential, voltage level shifted. used buffer voltage since parasitic series resistance will degrade CMRR. application back this data sheet, Four Digit Pressure Sensor, example.
±10mV ADJUSTMENT RANGE
LT1112
Figure Optional Trimming Output Offset Voltage
Input Bias Current Return Path input bias current LT1167 (350pA) high input impedance (200G) allow high impedance sources without introducing additional offset voltage errors, even when full common mode range required. However, path must provided input bias currents both inputs when purely differential signal being amplified. Without this path inputs will float either rail exceed input common mode range LT1167, resulting saturated input stage. Figure shows three examples input bias current path. first example purely differential signal source with input current path ground. Since impedance signal source low, only resistor needed. matching resistors needed higher impedance signal sources shown second example. Balancing input impedance improves both common mode rejection offset. need input resistors eliminated center present shown third example.
Output Offset Trimming LT1167 laser trimmed offset voltage that external offset trimming required most applications. event that offset needs adjusted, circuit Figure example optional offset adjust circuit. buffer provides impedance where resistance must kept minimum best CMRR lowest gain error.
LT1167 10mV -10mV OUTPUT
1167
LT1167
THEORY OPERATIO
THERMOCOUPLE LT1167
MICROPHONE, HYDROPHONE,
LT1167
200k
200k CENTER-TAP PROVIDES BIAS CURRENT RETURN
1167
Figure Providing Input Common Mode Current Path
APPLICATIONS INFORMATION
LT1167 power precision instrumentation amplifier that requires only external resistor accurately gain anywhere from 1000. output handle capacitive loads 1000pF gain configuration inputs protected against strikes 13kV (human body). Input Protection LT1167 safely handle ±20mA input current overload condition. Adding external input resistor series with each input allows input fault voltages ±100V improves immunity (contact) 15kV (air discharge), which 1000-4-2 level specification. lower value input resistors needed, clamp diode from positive supply each input will maintain 1000-4-2 specification level both contact discharge.
2N4393 2N4393 OPTIONAL HIGHEST PROTECTION
2N4393 drain/source gate good leakage diode with resistors, Figure input resistors should carbon metal film carbon film. Reduction many industrial data acquisition applications, instrumentation amplifiers used accurately amplify small signals presence large common mode voltages high levels noise. Typically, sources these very small signals order microvolts millivolts) sensors that significant distance from signal conditioning circuit. Although these sensors connected signal conditioning circuitry, using shielded unshielded twisted-pair cabling, cabling antennae, conveying very high frequency interference directly into input stage LT1167. amplitude frequency interference have adverse effect instrumentation amplifier's input stage causing unwanted shift amplifier's input offset voltage. This well known effect called rectification produced when out-of-band interference coupled (inductively, capacitively radiation) rectified instrumentation amplifier's input transistors. These transistors high frequency signal detectors, same diodes were used envelope detectors early radio designs. Regardless type interference method which coupled into circuit, out-of-band error signal appears series with instrumentation amplifier's inputs.
LT1167
1167
Figure Input Protection
LT1167
LT1167
APPLICATIONS INFORMATION
significantly reduce effect these out-of-band signals input offset voltage instrumentation amplifiers, simple lowpass filters used inputs. This filter should located very close input pins circuit. effective filter configuration illustrated Figure where three capacitors have been added inputs LT1167. Capacitors CXCM1 CXCM2 form lowpass filters with external series resistors RS1, out-of-band signal appearing each input traces. Capacitor forms filter reduce unwanted signal that would appear across input traces. added benefit using that circuit's common mode rejection degraded common mode capacitive imbalance. differential mode common mode time constants associated with capacitors are: tDM(LPF) (2)(RS)(CXD) tCM(LPF) (RS1, 2)(CXCM1, Setting time constants requires knowledge frequency, frequencies interference. Once this frequency known, common mode time constants followed differential mode time constant. avoid possibility inadvertently affecting signal processed, common mode time constant order magnitude more) larger than differential mode time constant. avoid possibility common mode differential mode signal conversion, match common mode time constants better. sensor resistive strain gauge, then series resistors RS1, omitted, sensor proximity instrumentation amplifier. "Roll Your Own"-Discrete Monolithic LT1167 Error Budget Analysis LT1167 offers performance superior that "roll your own" three discrete designs. typical application that amplifies buffers bridge transducer's differential output shown Figure amplifier, with gain 100, amplifies differential, full-scale output voltage 20mV over industrial range. make comparison challenging, cost version LT1167 will compared discrete instrumentation made with grade best precision quad amps, LT1114A. LT1167C outperforms discrete amplifier that lower VOS, lower comparable drift. error budget comparison Table shows various errors calculated each error affects total error budget. table shows greatest differences between discrete solution LT1167 input offset voltage CMRR. Note that discrete solution, noise voltage specification multiplied which uncorelated noise input amplifiers. Each amplifier errors referenced full-scale bridge differential voltage 20mV. common mode range bridge LT1114 data sheet provides offset voltage, offset voltage drift offset current specifications matched pairs used error-budget table. Even with excellent matching like LT1114, discrete solution's total error significantly higher than LT1167's total error. LT1167 additional advantages over discrete design, including lower component cost smaller size.
10pF 1.6k CXCM2 100pF EXTERNAL FILTER
Figure Adding Simple Filter Inputs Instrumentation Amplifier Effective Reducing Rectification High Frequency Out-of-Band Signals
CXCM1 1.6k 100pF
LT1167
1167
VOUT
LT1167
APPLICATIONS INFORMATION
LT1114A 10k* 10k*
LT1167C 100** 10k**
Figure "Roll Your Own" LT1167 Table "Roll Your Own" LT1167 Error Budget
ERROR SOURCE Absolute Accuracy 25°C Input Offset Voltage, Output Offset Voltage, Input Offset Current, CMR, LT1167C CIRCUIT CALCULATION 60µV/20mV (300µV/100)/20mV [(450pA)(350/2)]/20mV 110dB[(3.16ppm)(5V)]/20mV "ROLL YOUR OWN"' CIRCUIT CALCULATION 100µV/20mV [(60µV)(2)/100]/20mV [(450pA)(350)/2]/20mV [(0.02% Match)(5V)]/20mV Total Absolute Error Drift 85°C Gain Drift, ppm/°C Input Offset Voltage Drift, µV/°C Output Offset Voltage Drift, µV/°C ERROR, FULL SCALE LT1167C "ROLL YOUR OWN" 3000 3944 5000 5564
(50ppm 10ppm)(60°C) [(0.4µV/°C)(60°C)]/20mV [6µV/°C)(60°C)]/100/20mV
(100ppm/°C Track)(60°C) [(1.6µV/°C)(60°C)]/20mV [(1.1µV/°C)(2)(60°C)]/100/20mV Total Drift Error
Resolution Gain Nonlinearity, Full Scale 0.1Hz 10Hz Voltage Noise, µVP-P
15ppm 0.28µVP-P/20mV
10ppm (0.3µVP-P)( 2)/20mV Total Resolution Error Grand Total Error
100, ±15V errors min/max referred input.
Current Source Figure shows simple, accurate, power programmable current source. differential voltage across Pins mirrored across voltage across amplified applied across defining output
current. 50µA bias current flowing from buffered LT1464 JFET operational amplifier. This effect improving resolution current source 3pA, which maximum LT1464A. Replacing with programmable resistor greatly increases range available output currents.
PRECISION BRIDGE TRANSDUCER
LT1167 MONOLITHIC INSTRUMENTATION AMPLIFIER 100, ±10ppm SUPPLY CURRENT 1.3mA
LT1114A
10k*
"ROLL YOUR OWN" INST AMP, 0.02 RESISTOR MATCH, 3ppm/°C TRACKING DISCRETE RESISTOR, ±100ppm/°C 100ppm TRACKING SUPPLY CURRENT 1.35mA AMPLIFIERS
1167
3600 1200 4980
8953
10k** LT1114A
10k*
6000 4800 10866
16461
LT1167
APPLICATIONS INFORMATION
LT1167
LT1464
[(+IN) (-IN)]G 49.4k
LOAD
1167
Figure Precision Voltage-to-Current Converter
Nerve Impulse Amplifier LT1167's current noise makes ideal high source impedance monitors. Demonstrating LT1167's ability amplify level signals, circuit Figure takes advantage amplifier's high gain noise operation. This circuit amplifies level nerve impulse signals received from patient Pins parallel combination gain ten. potential LT1112's creates ground common mode signal. chosen maintain stability patient ground. LT1167's high CMRR ensures that desired differential signal amplified unwanted common mode signals attenuated. Since portion signal
PATIENT/CIRCUIT PROTECTION/ISOLATION 0.01µF
PATIENT GROUND
LT1112
POLE 1kHz
Figure Nerve Impulse Amplifier
important, make 0.3Hz highpass filter. signal LT1112's amplified gain (R7/R8) parallel combination form lowpass filter that decreases this gain frequencies above 1kHz. ability operate 0.9mA supply current makes LT1167 ideal battery-powered applications. Total supply current this application 1.7mA. Proper safeguards, such isolation, must added this circuit protect patient from possible harm. Favors High Impedance Bridges, Lowers Dissipation LT1167's supply current, supply voltage operation input bias currents optimize battery-powered applications. overall power dissipation necessitates using higher impedance bridges. single supply pressure monitor application (Figure shows LT1167 connected differential output 3.5k bridge. bridge's impedance almost order magnitude higher than that bridge used error-budget table. picoampere input bias currents keep error caused offset current negligible level. LT1112 level shifts LT1167's reference ADC's analog ground pins above ground. LT1167's LT1112's combined power dissipation still less than bridge's. This circuit's total supply current just 2.8mA.
0.47µF LT1167
0.3Hz HIGHPASS
LT1112 OUTPUT 1V/mV
15nF
1167
LT1167
APPLICATIONS INFORMATION
TECHNOLOGIES 67-8-3 R40KQ (0.02% RATIO MATCH)
3.5k 3.5k 3.5k 3.5k
LT1167
Figure Single Supply Pressure Monitor
TYPICAL APPLICATION
Coupled Instrumentation Amplifier
LT1167 0.3µF 500k
LT1112
LTC®1286 AGND DIGITAL DATA OUTPUT
LT1112
1167
OUTPUT
-3dB (2)(R1)(C1)
1167 TA04
1.06Hz
LT1167
PACKAGE
0.300 0.325 (7.620 8.255)
0.009 0.015 (0.229 0.381)
+0.035 0.325 -0.015 8.255 +0.889 -0.381
*THESE DIMENSIONS INCLUDE MOLD FLASH PROTRUSIONS. MOLD FLASH PROTRUSIONS SHALL EXCEED 0.010 INCH (0.254mm)
Dimensions inches (millimeters) unless otherwise noted.
Package 8-Lead PDIP (Narrow 0.300)
(LTC 05-08-1510)
0.400* (10.160)
0.255 0.015* (6.477 0.381)
0.130 0.005 (3.302 0.127)
0.045 0.065 (1.143 1.651)
0.065 (1.651) 0.125 (3.175) 0.020 (0.508) 0.018 0.003 (0.457 0.076) 1197
0.100 0.010 (2.540 0.254)
LT1167
PACKAGE
0.010 0.020 (0.254 0.508) 0.008 0.010 (0.203 0.254)
0.016 0.050 0.406 1.270
*DIMENSION DOES INCLUDE MOLD FLASH. MOLD FLASH SHALL EXCEED 0.006" (0.152mm) SIDE **DIMENSION DOES INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL EXCEED 0.010" (0.254mm) SIDE
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.
Dimensions inches (millimeters) unless otherwise noted.
Package 8-Lead Plastic Small Outline (Narrow 0.150)
(LTC 05-08-1610)
0.189 0.197* (4.801 5.004)
0.228 0.244 (5.791 6.197)
0.150 0.157** (3.810 3.988)
0.053 0.069 (1.346 1.752)
0.004 0.010 (0.101 0.254)
0.014 0.019 (0.355 0.483)
0.050 (1.270)
0996
LT1167
TYPICAL APPLICATION
4-Digit Pressure Sensor
392k LT1634CCZ-1.25
LT1114
0.2% ACCURACY ROOM TEMP 1.2% ACCURACY 60°C VOLTS 2.800 3.000 3.200 INCHES 28.00 30.00 32.00
RELATED PARTS
PART NUMBER LTC1100 LT1101 LT1102 LTC®1418 LT1460 LT1468 LTC1562 LTC1605 DESCRIPTION Precision Chopper-Stabilized Instrumentation Amplifier Precision, Micropower, Single Supply Instrumentation Amplifier High Speed, JFET Instrumentation Amplifier 14-Bit, Power, 200ksps with Serial Parallel Precision Series Reference 16-Bit Accurate Amp, Noise Fast Settling Active Filter 16-Bit, 100ksps, Sampling COMMENTS Best Accuracy Fixed Gain 100, 105µA Fixed Gain 100, 30V/µs Slew Rate Single Supply Operation, ±1.5LSB ±1LSB Micropower; 2.5V, Versions; High Precision 16-Bit Accuracy High Frequencies, 90MHz GBW, 22V/µs, 900ns Settling Lowpass, Bandpass, Highpass Responses; Noise, Distortion, Four Order Filter Sections Single Supply, Bipolar Input Range: ±10V, Power Dissipation: 55mW
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7417
(408)432-1900 FAX: (408) 434-0507 www.linear-tech.com
LUCAS NOVA SENOR NPC-1220-015A-3L
LT1167
RSET
LT1114
4-DIGIT
LT1114
180k
100k
100k
1167 TA03
1167f LT/GP 1298 PRINTED
LINEAR TECHNOLOGY CORPORATION 1998

®1167 power, precision instrumentation amplifier that requires only ex

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