CONNECTIONS NULL NULL FEATURES Excellent Individual Amplifie

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CONNECTIONS NULL NULL FEATURES Excellent Individual Amplifie

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Dual, Noise, Offset Instrumentation Operational Amplifier OP227
CONNECTIONS
NULL NULL
FEATURES Excellent Individual Amplifier Parameters VOS, Offset Voltage Match, Offset Voltage Match Temperature, Stable Time, Voltage Noise, nV/÷Hz Fast, High Gain, Million High Channel Separation,
NULL NULL
NOTE DEVICE OPERATED EVEN INSERTION REVERSED; THIS INHERENT SYMMETRY LOCATIONS AMPLIFIERS V-(A) V-(B) INTERNALLY CONNECTED SUBSTRATE RESISTANCE
GENERAL DESCRIPTION
OP227 first dual amplifier offer combination offset, noise, high speed, guaranteed amplifier matching characteristics device. OP227, with match typical, TCVOS match mV/C typical corner only excellent choice precision noise designs. These characteristics, coupled with slew rate V/ms typical small-signal bandwidth typical, allow designer achieve performance previously unattainable with based instrumentation designs. When used three instrumentation configuration, OP227 achieve CMRR excess kHz. addition, this device open-loop gain typical with load. OP227 also features typical, typical, guaranteed matching input currents
between amplifiers. These outstanding input current specifications realized through unique input current cancellation circuit which typically holds respectively over full military temperature range. Other sources input referred errors, such PSRR CMRR, reduced factors excess individual amplifiers. stability assured long-term drift application mV/month. Matching between channels provided critical parameters including offset voltage, tracking offset voltage versus temperature, noninverting bias current, CMRR, power supply rejection ratio. This unique dual amplifier allows elimination external components offset nulling frequency compensation.
SIMPLIFIED SCHEMATIC
NULL OUTPUT INVERTING INPUT INVERTING INPUT
PREMATURELY ADJUSTED WAFER TEST MINIMUM OFFSET VOLTAGE.
REV.
Information furnished Analog Devices believed accurate reliable. However, responsibility assumed Analog Devices use, infringements patents other rights third parties that result from use. license granted implication otherwise under patent patent rights Analog Devices. Technology Way, P.O. 9106, Norwood, 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 Analog Devices, Inc., 2002
OP227-SPECIFICATIONS
Individual Amplifier Characteristics
unless otherwise noted.)
OP227E 0.20 OP227G 0.09 0.28 Unit mV/MO
Parameter INPUT OFFSET VOLTAGE LONG-TERM STABILITY INPUT OFFSET CURRENT INPUT BIAS CURRENT INPUT NOISE VOLTAGE INPUT NOISE VOLTAGE DENSITY
Symbol VOS/Time
Conditions Note Notes
Notes 1000 Hz3, Hz3, 1000 Hz3, Note 11.0
0.08
12.3
11.0
12.3
INPUT NOISE DENSITY
INPUT RESISTANCE Differential Mode Common Mode INPUT VOLTAGE RANGE COMMON-MODE REJECTION RATIO POWER SUPPLY REJECTION RATIO LARGE-SIGNAL VOLTAGE GAIN
RINCM CMRR PSRR
mV/V
1000 12.0 10.0
1800 1500 13.8 11.5
11.5 10.0
1500 1500 13.5 11.5
V/mV V/mV V/ms
OUTPUT VOLTAGE SWING SLEW RATE GAIN BANDWIDTH PROD. OPEN-LOOP OUTPUT RESISTANCE POWER CONSUMPTION OFFSET ADJUSTMENT RANGE
Note Each Amplifier
NOTES Input offset voltage measurements performed automated test equipment approximately seconds after application power. Grade specifications guaranteed fully warmed Long term input offset voltage stability refers average trend line time over extended periods after first days operation. Excluding initial hour operation, changes during first days typically Refer Typical Performance Curve. Sample tested. Parameter guaranteed design. test circuit frequency response curve tester. test circuit current noise measurement. Guaranteed input bias current. Specifications subject change without notice.
REV.
OP227
SPECIFICATIONS
Individual Amplifier Characteristics
unless otherwise noted.)
OP227E OP227G Unit mV/V V/mV
Parameter INPUT OFFSET VOLTAGE AVERAGE INPUT OFFSET DRIFT INPUT OFFSET CURRENT INPUT BIAS CURRENT INPUT VOLTAGE RANGE COMMON-MODE REJECTION RATIO POWER SUPPLY REJECTION RATIO LARGE-SIGNAL VOLTAGE GAIN OUTPUT VOLTAGE SWING
Symbol TCVOS TCVOSn CMRR PSRR
Conditions Note
Note
11.8
11.8
11.7
1500 13.6
11.0
1000 13.3
Matching Characteristics unless otherwise noted.)
Parameter INPUT OFFSET VOLTAGE MATCH AVERAGE NONINVERTING CURRENT NONINVERTING OFFSET CURRENT INVERTING OFFSET CURRENT COMMON-MODE REJECTION RATIO MATCH POWER SUPPLY REJECTION RATIO MATCH CHANNEL SEPARATION Symbol Conditions OP227E OP227G Unit Bias
IOS+ IOSCMRR
IOS+ IB+A-IB+B IOS- IB-A-IB-B Note
PSRR
mV/V
NOTES Input Offset Voltage measurements performed automated equipment approximately seconds after application power. TCVOS performance within specifications unnulled when nulled with optimum performance obtained with Sample tested. Specifications subject change without notice.
REV.
OP227-SPECIFICATIONS
Matching Characteristics
unless otherwise noted.)
OP227E OP227G Unit
Parameter INPUT OFFSET VOLTAGE MATCH INPUT OFFSET TRACKING AVERAGE NONINVERTING BIAS CURRENT AVERAGE DRIFT NONINVERTING BIAS CURRENT NONINVERTING OFFSET CURRENT AVERAGE DRIFT NONINVERTING OFFSET CURRENT INVERTING OFFSET CURRENT COMMON-MODE REJECTION RATIO MATCH POWER SUPPLY REJECTION RATIO MATCH
NOTES *Sample tested.
Symbol
Conditions
Nulled Unnulled*
TCIB+ IOS+ TCIOS+ IOS- CMRR IOS- IB-A-IB-B IOS+ IB+A-IB+B
mV/V
PSRR
Specifications subject change without notice.
REV.
OP227
Supply Voltage Input Voltage1 Output Short-Circuit Duration Indefinite Differential Input Voltage2 Differential Input Current2 Storage Temperature Range -65C +150C Operating Temperature Range OP227E, OP227G -25C +85C Lead Temperature (Soldering sec) 300C
NOTES supply voltages less than absolute maximum input voltage equal supply voltage. OP227 inputs protected back-to-back diodes. Current limiting resistors used order achieve noise. differential input voltage exceeds input current should limited specified worst-case mounting conditions, i.e., specified device socket CERDIP package.
ABSOLUTE MAXIMUM RATINGS
THERMAL CHARACTERISTICS Thermal Resistance
14-Lead CERDIP 106C/W 16C/W
ORDERING GUIDE
Hermetic 14-Lead OP227EY OP227GY
Operating Temperature Range
military processed devices, please refer Standard Microcircuit Drawing (SMD) available Part Number 5962-8688701CA* Equivalent OP227AYMDA
*Not recommended design, obsolete April 2002.
CAUTION (electrostatic discharge) sensitive device. Electrostatic charges high 4000 readily accumulate human body test equipment discharge without detection. Although OP227 features propriety protection circuitry, permanent damage occur devices subjected high energy electrostatic discharges. Therefor, proper precautions recommended avoid performance degradation loss functionality.
WARNING!
SENSITIVE DEVICE
REV.
OP227-Typical Performance Characteristics
100k
VOLTAGE NOISE
BACK-TO-BACK
OP12 100k 24.3k 110k 2.35 SCOPE
D.U.T.
4.3k
23.5
-120
VOLTAGE GAIN 50,000
BACK-TO-BACK
BACK-TO-BACK
0.1Hz 10Hz PEAK-TO-PEAK NOISE
Voltage Noise Test Circuit (0.1 p-p)
Frequency Noise (Observation Must Limited Seconds Ensure Cutoff)
VOLTAGE NOISE DENSITY
CORNER 2.7Hz
VOLTAGE NOISE
VOLTAGE NOISE
CORNER NOISE AUDIO CORNER CORNER OP227
FREQUENCY
INSTRUMENTATION RANGE,
AUDIO RANGE
0.01
FREQUENCY
BANDWIDTH
100k
Voltage Noise Density Frequency
Comparison Voltage Noise Spectr
Input Wideband Noise Bandwidth (0.1 Frequency Indicated)
TOTAL NOISE
10Hz
1kHz
CURRENT NOISE
VOLTAGE NOISE DENSITY
10.0
10Hz 1kHZ RESISTOR NOISE ONLY SOURCE RESISTANCE
CORNER 140Hz
TEMPERATURE
FREQUENCY
Total Noise Source Resistance
Voltage Noise Density Temperature
Current Noise Density Frequency
REV.
OP227
OFFSET VOLTAGE DRIFT WITH TIME
V/MO. TIME MONTHS V/MO. V/MO.
SUPPLY CURRENT (BOTH AMPLIFIERS
TOTAL SUPPLY VOLTAGE +125
OFFSET VOLTAGE
-100 -75-55-35-15 105125145165 TEMPERATURE
Supply Current Supply Voltage
Offset Voltage Drift Representative Units
Offset Voltage Stability with Time
CHANGE INPUT OFFSET VOLTAGE
INPUT BIAS CURRENT
ABSOLUTE CHANGE INPUT OFFSET VOLTAGE
OP227G
THERMAL SHOCK RESPONSE BAND DEVICE IMMERSED BATH TIME
TIME AFTER POWER MINUTES
TEMPERATURE
Warm-Up Drift
Offset Voltage Change Thermal Shock
Input Bias Current Temperature
SLEW RATE PHASE MARGIN
INPUT OFFSET CURRENT
OPEN-LOOP GAIN
SLEW TEMERATURE
TEMPERATURE
100k 100M FREQUENCY
Input Offset Current Temperature
Open-Loop Gain Frequency
Slew Rate, Gain Bandwidth Product, Phase Margin Temperature
REV.
GAINBANDWIDTH PRODUCT
OP227
GAIN
OPEN-LOOP GAIN
OUTPUT SWING
100M
PHASE SHIFT
POSITIVE SWING NEGATIVE SWING
GAIN
PHASE MARGIN
FREQUENCY
TOTAL SUPPLY VOLTAGE
LOAD RESISTANCE
Gain, Phase Shift Frequency
Open-Loop Gain Supply Voltage
Output Swing Resistive Load
PEAK-TO-PEAK OUTPUT VOLTAGE
SHORT-CIRCUIT CURRENT
lSC(-)
PERCENT OVERSHOOT
615V 100mV
lSC(+)
100k FREQUENCY
1000 1500 2000 CAPACITIVE LOAD
2500
TIME FROM OUTPUT SHORTED GROUND MINUTES
Maximum Undistorted Output Frequency
Small-Signal Overshoot Capacitive Load
Short-Circuit Current Time
20mV +50mV
500ns
CMMR
-50mV
AVCL 15pF
AVCL
100k FREQUENCY
Small-Signal Transient Response
Large-Signal Transient Response
Matching Characteristic CMRR Match Frequency
REV.
OP227
COMMON-MODE RANGE
OPEN-LOOP VOLTAGE GAIN
PSRR
PSSR
+125
PSRR PSRR
PSRR
PSRR
LOAD RESISTANCE 100k
+125
SUPPLY VOLTAGE
FREQUENCY
100k
Common-Mode Input Range Supply Voltage
Open-Loop Voltage Gain Load Resistance
PSRR PSRR Frequency
OFFSET VOLTAGE MATCH
NONINVERTING BIAS CURRENT
OFFSET CURRENT
TEMPERATURE
-100 -120 -55-35-15 105125145165 TEMPERATURE
TEMPERATURE
Matching Characteristic: Drift Offset Voltage Match Representative Units
Matching Characteristic: Average Noninverting Bias Current Temperature
Matching Characteristic: Average Offset Current Temperature (Inverting Noninverting)
CHANNEL SEPARATION
CMRR
TEMPERATURE
100k FREQUENCY
Matching Characteristic: CMRR Match Temperature
Channel Separation Frequency
REV.
OP227
BASIC CONNECTIONS
V+(A)
noise-voltage-density test recommended when measuring noise large number units. noise-voltagedensity measurement will correlate well with peak-to-peak noise reading, since both results determined white noise location corner frequency.
Instrumentation Amplifier Applications OP227
INPUTS
V-(A)
excellent input characteristics OP227 make ideal instrumentation amplifier configurations where level differential signals amplified. noise, input offsets, drift, high gain, combined with excellent provide characteristics needed high performance instrumentation amplifiers. addition, versus frequency very good wide gain bandwidth these amps. circuit Figure recommended applications where common-mode input range relatively differential gain will range 1000. This instrumentation amplifier features independent adjustment common-mode rejection differential gain. Input impedance very high since both inputs applied non-inverting inputs.
OP227
INPUTS V-(B)
V+(A)
1/2Vd
Figure Offset Nulling Circuit
1/2Vd
R2R0R3
APPLICATIONS INFORMATION Noise Measurements
measure peak-to-peak noise specification OP227 range, following precautions must observed: device must warmed least five minutes. shown warm-up drift curve, offset voltage typically changes increasing chip temperature after power-up. 10-second measurement interval, these temperatureinduced effects exceed tens-of-nanovolts. similar reasons, device must well shielded from currents. Shielding minimizes thermocouple effects. Sudden motion vicinity device also "feedthrough" increase observed noise. test time measure noise should exceed 10-seconds. shown noise-tester frequencyresponse curve, corner defined only zero eliminate noise contributions from frequency band below
Figure Instrumentation Amplifier Configuration
output voltage assuming ideal amps, given Figure input voltages represented common-mode input, VCM, plus differential input, ratio R3/R4 made equal ratio R2/R1 reject common mode input VCM. differential signal then amplified according
where
Note that gain independently varied adjusting From considerations dynamic range, resistor tempco matching, matching amplifier response, generally best make approximately equal. Designing allows output equation further simplified:
where
-10-
REV.
OP227
Dynamic range limited well output
instrumentation amplifier designed gain maximum then RN/RO would need four would maximum Amplifier would have maximum output plus VCM, thus limit output would imply limit VCM. nominal value suitable most applications. range will then provide gain range 1000. current through Vd/RO, amplifiers must supply mV/20 when gain maximum value 1000 Rejecting common-mode inputs important accurately amplifying level differential signals. factors determine this instrumentation amplifier configuration (assuming infinite gain): amps Matching resistor network ratios (R3/R4 R2/R1) this instrumentation amplifier configuration error effect directly proportional match amps. OP227, this DCMR minimum grades. DCMR value common-mode input range indicates peak inputreferred error only Resistor matching other factor affecting CMR. Defining differential gain instrumentation amplifier assuming that approximately equal will nominal value), then this instrumentation amplifier configuration will approximately divided R/RN. differential gain would with resistor matching 0.01%. Trimming make ratio R3/R4 equal R2/R1 will raise until limited linearity resistor stability considerations. high open-loop gain OP227 very important achieving high accuracy instrumentation amplifier configuration. Gain error approximated
Ad/A01 this simplifies (2Ad/A01) VCM. gain V/mV, 700, then error output this effect will approximately compete instrumentation amplifier designed gain shown Figure provision trimming input offset voltage, CMR, gain. Performance excellent high gain, high CMR, noise individual amplifiers combined with tight matching characteristics OP227 dual.
OFFSET ADJUST
0.1%
9.95k 1/2Vd 2.5k GAIN
OP227
1/2Vd 100Vd
0.1% 0.1%
Figure Instrumentation Amplifier Using OP227 Dual
Gain Error
three instrumentation amplifier configuration using OP227 OP27 recommended applications requiring high accuracy over wide gain range. This circuit provides excellent over wide frequency range. with instrumentation amplifier circuits, tight matching amps within OP227 package provides real boost performance. Also, noise, offset, high gain individual amps minimize errors. simplified schematic shown Figure input stage serves amplify differential input without amplifying common-mode voltage VCM. output stage then rejects common-mode input. With ideal amps resistor matching errors, outputs each amplifier will 2R1~ 2R1~ 2R1~ -11-
where instrumentation amplifier differential gain open loop gain This analysis assumes equal values example, consider OP227 with V/mV. differential gain were 700, then gain error would 1/1.001, which approximately 0.1%. Another effect finite gain undesired feedthrough common-mode input. Defining open-loop gain then common-mode error (CME) output this effect would approximately:
REV.
OP227
differential gain 2R1/R0 common-mode input rejected. While output error input offsets noise easily determined, effects finite gain common-mode rejection more subtle. complete instrumentation amplifier directly proportioned match input amps. This match varies from minimum OP227. Using then output response common-mode input would CMRR
AO/AO were were 600,000, then CMRR finite gain input amps would approximately
OP227
1/2Vd
10-5
CMRR instrumentation amplifier, which defined log10Ad/ACM, simply equal CMRR OP227. While this CMRR already high, overall CMRR complete amplifier raised trimming output stage resistor network. Finite gain input amps causes scale factor error small degradation CMR. Designating open-loop gain AO1, AO2, then following equation approximates output:
OP27
OP227
1/2Vd
Figure Three Instrumentation Amplifier Using OP227 OP27
This simplified defining nominal open-loop gain differential open-loop gain. Then:
unity-gain output stage contributes negligible error overall amplifier. However, matching four resistor network critical achieving high CMR. Consider worstcase situation where each resistor error resistor ratio high side other, then common-mode gain will R2/2 Since output stage gain unity, CMRR will then R2/2 common practice maximize overall CMRR total instrumentation amplifier circuit.
high open-loop gain each amplifier within OP227 (700,000 minimum assures good gain accuracy even high values effect finite openloop gain approximated
-12-
REV.
OP227
High Speed Precision Rectifier
offsets excellent load driving capability OP27 advantages this precision rectifier circuit. summing impedances which helps reduce effects stray capacitance. positive inputs, conducts biased OFF. Amplifiers follower with output-to-output feedback resistors critical. negative inputs, conducts biased OFF. acts follower serves precision inverter. this mode, matching resistors critical gain accuracy.
Typical component values drop across must less than drop across diode 1N914 2N4393 JFET were used successfully. circuit provides full-wave rectification inputs frequency. assure frequency stability, sure decouple power supply inputs minimize capactive loading. OP227, which OP27 amplifiers single package, used improve packaging density.
30pF 1N914
MATCHED
OP27 2N4393
Figure High Speed Precision Rectifier
REV.
-13-
OP227
OUTLINE DIMENSIONS 14-Lead Ceramic Glass Hermetic Seal [CERDIP] (Q-14)
Dimensions shown inches (millimeters)
0.005 (0.13)
0.098 (2.49)
0.310 (7.87) 0.220 (5.59) 0.320 (8.13) 0.290 (7.37) 0.060 (1.52) 0.015 (0.38)
0.100 (2.54) 0.785 (19.94) 0.200 (5.08) 0.200 (5.08) 0.125 (3.18) 0.023 (0.58) 0.014 (0.36)
0.150 (3.81) 0.070 (1.78) SEATING PLANE 0.030 (0.76)
0.015 (0.38) 0.008 (0.20)
CONTROLLING DIMENSIONS INCHES; MILLIMETERS DIMENSIONS PARENTHESES) ROUNDED-OFF INCH EQUIVALENTS REFERENCE ONLY APPROPRIATE DESIGN
-14-
REV.
OP227 Revision History
Location 10/02-Data Sheet changed from REV. REV. Page
Edits GENERAL DESCRIPTION OP227A OP227F deleted from Individual Amplifier Characteristics section OP227A OP227F deleted from Matching Characteristics section Edits ABSOLUTE MAXIMUM RATINGS Edits ORDERING GUIDE Updated OUTLINE DIMENSIONS
REV.
-15-
-16-
C02685-0-10/02(A)
PRINTED U.S.A.

CONNECTIONS NULL NULL FEATURES Excellent Individual Amplifie

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