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Noise, Precision Operational Amplifier OP27
noise: (0.1 Hz), nV/Hz drift: V/°C High speed: slew rate, gain bandwidth VOS: Excellent CMRR: High open-loop gain: million Fits OP07, 5534A sockets Available form
CONFIGURATIONS
00317-001
OP27
(CASE) CONNECT
Figure 8-Lead TO-99 (J-Suffix)
GENERAL DESCRIPTION
OP27 precision operational amplifier combines offset drift OP07 with both high speed noise. Offsets down maximum drift V/°C make OP27 ideal precision instrumentation applications. Exceptionally noise, nV/Hz, noise corner frequency high gain (1.8 million), allow accurate high-gain amplification low-level signals. gain-bandwidth product slew rate provide excellent dynamic accuracy high speed, dataacquisition systems. input bias current achieved bias current cancellation circuit. Over military temperature range, this circuit typically holds respectively. output stage good load driving capability. guaranteed swing into output distortion make OP27 excellent choice professional audio applications. (Continued Page
TRIM
OP27
TRIM
00317-002
CONNECT
Figure 8-Lead CERDIP Glass Hermetic Seal (Z-Suffix), 8-Lead PDIP (P-Suffix), 8-Lead (S-Suffix)
FUNCTIONAL BLOCK DIAGRAM
NONINVERTING INPUT INVERTING INPUT
ADJ.
OUTPUT
Figure
Rev.
Information furnished Analog Devices believed accurate reliable. However, responsibility assumed Analog Devices use, infringements patents other rights third parties that result from use. Specifications subject change without notice. license granted implication otherwise under patent patent rights Analog Devices. Trademarks registered trademarks property their respective owners.
Technology Way, P.O. 9106, Norwood, 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2006 Analog Devices, Inc. rights reserved.
00317-003
PERMANENTLY ADJUSTED WAFER TEST MINIMUM OFFSET VOLTAGE
OP27 TABLE CONTENTS
Features General Description Configurations Functional Block Diagram Revision History Specifications. Electrical Characteristics. Typical Electrical Characteristics Absolute Maximum Ratings. Thermal Resistance Caution. Typical Performance Characteristics Application Information. Offset Voltage Adjustment Noise Measurements. Unity-Gain Buffer Applications Comments Noise Audio Applications References. Outline Dimensions Ordering Guide.
REVISION HISTORY
5/06-Rev. Rev. Removed References .Universal Updated AD741 .Universal Changes Ordering Guide 12/05-Rev. Rev. Edits Figure 9/05-Rev. Rev. Updated Format.Universal Changes Table Removed Characteristics Figure Removed Wafer Test Limits Table Changes Table Changes Comments Noise Section Changes Ordering Guide 1/03-Rev. Rev. Edits Connections. Edits General Description. Edits Characteristics. Edits Absolute Maximum Ratings Updated Outline Dimensions Edits Figure Edits Outline Dimensions. 9/01-Rev. Rev. Edits Ordering Information Edits Connections.1 Edits Absolute Maximum Ratings Edits Package Type Edits Electrical Characteristics Edits Wafer Test Limits Deleted Typical Electrical Characteristics.4 Edits Burn-In Circuit Figure Edits Application Information
Rev. Page
OP27
GENERAL DESCRIPTION
(Continued from Page PSRR CMRR exceed These characteristics, coupled with long-term drift V/month, allow circuit designer achieve performance levels previously attained only discrete designs. cost, high volume production OP27 achieved using on-chip Zener zap-trimming network. This reliable stable offset trimming scheme proven effectiveness over many years production history. OP27 provides excellent performance noise, high accuracy amplification level signals. Applications include stable integrators, precision summing amplifiers, precision voltage threshold detectors, comparators, professional audio circuits such tape heads microphone preamplifiers. OP27 direct replacement OP06, OP07, OP45 amplifiers; AD741 types directly replaced removing nulling potentiometer AD741.
Rev. Page
OP27 SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
25°C, unless otherwise noted. Table
Parameter INPUT OFFSET VOLTAGE LONG-TERM STABILITY INPUT OFFSET CURRENT INPUT BIAS CURRENT INPUT NOISE VOLTAGE3, INPUT NOISE Voltage Density3 INPUT NOISE Current Density3 INPUT RESISTANCE Differential Mode Common Mode INPUT VOLTAGE RANGE COMMON-MODE REJECTION RATIO POWER SUPPLY REJECTION RATIO LARGE SIGNAL VOLTAGE GAIN OUTPUT VOLTAGE SWING SLEW RATE GAIN BANDWIDTH PRODUCT6 OPEN-LOOP OUTPUT RESISTANCE POWER CONSUMPTION OFFSET ADJUSTMENT RANGE
Symbol VOS/Time
Conditions
1000 1000 ±11.0 1000 ±12.0 ±10.0
OP27A/E 0.08 ±12.3 1800 1500 ±13.8 ±11.5 ±4.0
0.18
OP27/G 0.09 ±12.3 1500 1500 ±13.5 ±11.5 ±4.0
0.25
Unit V/MO nV/Hz nV/Hz nV/Hz pA/Hz pA/Hz pA/Hz V/mV V/mV
RINCM CMRR PSRR
±11.0 ±11.5 ±10.0
Input offset voltage measurements performed approximately seconds after application power. grades 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 Characteristics section. Sample tested. voltage noise test circuit (Figure 31). Guaranteed input bias current. Guaranteed design.
Rev. Page
OP27
-55°C 125°C, unless otherwise noted. Table
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
OP27A ±11.5 1200 ±13.5
Unit V/°C V/mV
±4.5
±10.3 ±11.5
Input offset voltage measurements performed automated test equipment approximately seconds after application power. grades guaranteed fully warmed TCVOS performance within specifications unnulled when nulled with TCVOS 100% tested grades, sample tested grades. Guaranteed design.
-25°C 85°C OP27J, OP27Z, 70°C OP27EP, -40°C 85°C OP27GP, OP27GS, unless otherwise noted. Table
Parameter INPUT ONSET 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
±4.5
±10.5 ±11.7
OP27E ±11.8 1500 ±13.6
±10.5 ±11.0
OP27G ±11.8 1000 ±13.3
±150
Unit V/°C V/°C V/mV
TCVOS performance within specifications unnulled when nulled with TCVOS 100% tested grades, sample tested grades. Guaranteed design.
Rev. Page
OP27
TYPICAL ELECTRICAL CHARACTERISTICS
25°C unless otherwise noted. Table
Parameter AVERAGE INPUT OFFSET VOLTAGE DRIFT AVERAGE INPUT OFFSET CURRENT DRIFT AVERAGE INPUT BIAS CURRENT DRIFT INPUT NOISE VOLTAGE DENSITY Symbol TCVOS TCVOSn TCIOS TCIB enp-p Conditions Nulled unnulled OP27N Typical 0.08 Unit V/°C pA/°C pA/°C nV/Hz nV/Hz nV/Hz pA/Hz pA/Hz pA/Hz
1000 1000
INPUT NOISE CURRENT DENSITY
INPUT NOISE VOLTAGE SLEW RATE GAIN BANDWIDTH PRODUCT
Input offset voltage measurements performed automated test equipment approximately seconds after application power.
Rev. Page
OP27 ABSOLUTE MAXIMUM RATINGS
Table
Parameter Supply Voltage Input Voltage Output Short-Circuit Duration Differential Input Voltage Differential Input Current2 Storage Temperature Range Operating Temperature Range OP27A OP27E, OP27E, OP27G Lead Temperature Range (Soldering, sec) Junction Temperature
Rating Indefinite ±0.7 -65°C +150°C -55°C +125°C -25°C +85°C 70°C -40°C +85°C 300°C -65°C +150°C
Stresses above those listed under Absolute Maximum Ratings cause permanent damage device. This stress rating only; functional operation device these other conditions above those indicated operational section this specification implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
THERMAL RESISTANCE
specified worst-case conditions, that specified device socket CERDIP, PDIP packages; specified device soldered printed circuit board package. Absolute maximum ratings apply both DICE packaged parts, unless otherwise noted. Table
Package Type TO-99 8-Lead Hermetic 8-Lead Plastic 8-Lead Unit °C/W °C/W °C/W °C/W
supply voltages less than absolute maximum input voltage equal supply voltage. inputs OP27 protected back-to-back diodes. Current limiting resistors used order achieve noise. differential input voltage exceeds ±0.7 input current should limited
CAUTION
(electrostatic discharge) sensitive device. Electrostatic charges high 4000 readily accumulate human body test equipment discharge without detection. Although this product features proprietary protection circuitry, permanent damage occur devices subjected high energy electrostatic discharges. Therefore, proper precautions recommended avoid performance degradation loss functionality.
Rev. Page
OP27 TYPICAL PERFORMANCE CHARACTERISTICS
VOLTAGE NOISE
25°C ±15V
GAIN (dB)
0.01 TEST TIME 10sec FURTHER LIMITS FREQUENCY (<0.1Hz) GAIN
00317-004
FREQUENCY (Hz)
BANDWIDTH (Hz)
100k
Figure Noise Tester Frequency Response
Figure Input Wideband Voltage Noise Bandwidth (0.1 Frequency Indicated)
25°C ±15V
VOLTAGE NOISE (nV/Hz) CORNER 2.7Hz
25°C ±15V
TOTAL NOISE (nV/Hz)
10Hz 1kHz RESISTOR NOISE ONLY
FREQUENCY (Hz)
00317-005
SOURCE RESISTANCE
Figure Voltage Noise Density Frequency
VOLTAGE NOISE (nV/Hz)
Figure Total Noise Sourced Resistance
±15V
VOLTAGE NOISE (nV/Hz)
10Hz
CORNER CORNER 2.7Hz OP27 CORNER NOISE AUDIO
1kHz
INSTRUMENTATION RANGE FREQUENCY (Hz)
AUDIO RANGE 20kHz
00317-006
TEMPERATURE (°C)
Figure Comparison Voltage Noise Spectra
Figure Voltage Noise Density Temperature
Rev. Page
00317-009
00317-008
00317-007
0.01
OP27
25°C
OP27C
VOLTAGE NOISE (nV/Hz)
OP27A
OFFSET VOLTAGE
10Hz
TRIMMING WITH DOES CHANGE TCVOS OP27A OP27A
1kHz
TOTAL SUPPLY VOLTAGE,
TEMPERATURE (°C)
Figure Voltage Noise Density Supply Voltage
10.0
Figure Offset Voltage Drift Five Representative Units Temperature
CHANGE OFFSET VOLTAGE
00317-011
CURRENT NOISE (pA/Hz)
CORNER 140Hz
FREQUENCY (Hz)
TIME (Months)
Figure Current Noise Density Frequency
Figure Long-Term Offset Voltage Drift Representative Units
CHANGE INPUT OFFSET VOLTAGE
25°C OP27
SUPPLY CURRENT (mA)
+125°C -55°C +25°C
OP27
OP27
00317-012
TOTAL SUPPLY VOLTAGE
TIME AFTER POWER (Min)
Figure Supply Current Supply Voltage
Figure Warm-Up Offset Voltage Drift
Rev. Page
00317-015
00317-014
00317-013
00317-010
OP27C
OP27
±15V 25°C 70°C
OPEN-LOOP GAIN (dB)
THERMAL SHOCK RESPONSE BAND
DEVICE IMMERSED 70°C BATH
00317-016
TIME (Sec)
100k
100M
FREQUENCY (Hz)
Figure Offset Voltage Change Thermal Shock
Figure Open-Loop Gain Frequency
PHASE MARGIN (Degrees)
±15V
±15V
OP27C OP27A
00317-017
SLEW RATE (V/S)
SLEW
00317-020
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure Input Bias Current Temperature
Figure Slew Rate, Gain Bandwidth Product, Phase Margin Temperature
±15V
GAIN 25°C ±15V
PHASE MARGIN 100M
PHASE SHIFT (Degrees)
00317-021
INPUT OFFSET CURRENT (nA)
GAIN (dB)
OP27C OP27A
00317-018
TEMPERATURE (°C)
FREQUENCY (Hz)
Figure Input Offset Current Temperature
Figure Gain, Phase Shift Frequency
Rev. Page
GAIN BANDWIDTH PRODUCT (MHz)
INPUT BIAS CURRENT (nA)
00317-019
VOLTAGE GAIN (dB)
OP27
25°C ±15V 100mV
OPEN-LOOP GAIN (V/V)
OVERSHOOT
00317-022
1000
1500
2000
2500
TOTAL SUPPLY VOLTAGE
CAPACITIVE LOAD (pF)
Figure Open-Loop Voltage Gain Supply Voltage
MAXIMUM OUTPUT SWING
Figure Small-Signal Overshoot Capacitive Load
25°C ±15V
20mV 500ns AVCL 15pF ±15V 25°C
50mV
-50mV
100k FREQUENCY (Hz)
00317-023
Figure Maximum Output Swing Frequency
MAXIMUM OUTPUT
Figure Small-Signal Transient Response
POSITIVE SWING NEGATIVE SWING
AVCL ±15V 25°C
LOAD RESISTANCE 25°C ±15V
00317-024
00317-027
Figure Maximum Output Voltage Load Resistance
Figure Large Signal Transient Response
Rev. Page
00317-026
00317-025
OP27
25°C
0.1F 100k
SHORT-CIRCUIT CURRENT (mA)
D.U.T.
OP27
4.3k SCOPE 110k
VOLTAGE GAIN 50,000 4.7F
OP12 100k
TIME FROM OUTPUT SHORTED GROUND (Min)
Figure Short-Circuit Current Time
00317-028
Figure Voltage Noise Test Circuit (0.1
OPEN-LOOP VOLTAGE GAIN (V/V)
±15V 25°C ±10V
25°C ±15V
CMRR (dB)
FREQUENCY (Hz)
100k
00317-029
100k
LOAD RESISTANCE
Figure CMRR Frequency
-55°C +25°C +125°C +125°C -55°C +25°C
Figure Open-Loop Voltage Gain Load Resistance
SEC/DIV -120
COMMON-MODE RANGE
VOLTAGE NOISE (nV)
SUPPLY VOLTAGE
00317-030
0.1Hz 10Hz NOISE
Figure Common-Mode Input Range Supply Voltage
Figure Frequency Noise
Rev. Page
00317-033
00317-032
00317-031
0.1F 2.2F 24.3k
OP27
25°C
POWER SUPPLY REJECTION RATIO (dB)
NEGATIVE SWING
POSITIVE SWING
100k
100M
FREQUENCY (Hz)
Figure PSRR Frequency
00317-034
Rev. Page
OP27 APPLICATION INFORMATION
OP27 series units inserted directly into OP07 sockets with without removal external compensation nulling components. Additionally, OP27 fitted unnulled AD741-type sockets; however, conventional AD741 nulling circuitry use, should modified removed ensure correct OP27 operation. OP27 offset voltage nulled another desired setting) using potentiometer (see Figure 35). OP27 provides stable operation with load capacitances 2000 swings; larger capacitances should decoupled with resistor inside feedback loop. OP27 unity-gain stable. Thermoelectric voltages generated dissimilar metals input terminal contacts degrade drift performance. Best operation obtained when both input contacts maintained same temperature.
NOISE MEASUREMENTS
measure noise specification OP27 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 temperature-induced effects exceed tens-ofnanovolts. similar reasons, device well-shielded from currents. Shielding minimizes thermocouple effects. Sudden motion vicinity device also feedthrough increase observed noise. test time measure noise should exceed seconds. shown noise-tester frequency response curve, corner defined only zero. test time seconds acts additional zero eliminate noise contributions from frequency band below noise voltage density test recommended when measuring noise large number units. noise voltage density measurement correlates well with noise reading, since both results determined white noise location corner frequency.
OP27
OUTPUT
Figure Offset Nulling Circuit
OFFSET VOLTAGE ADJUSTMENT
input offset voltage OP27 trimmed wafer level. However, further adjustment necessary, trim potentiometer used. TCVOS degraded (see Figure 35). Other potentiometer values from used with slight degradation (0.1 V/°C V/°C) TCVOS. Trimming value other than zero creates drift approximately (VOS/300) V/°C. example, change TCVOS 0.33 V/°C adjusted offset voltage adjustment range with potentiometer smaller adjustment range required, nulling sensitivity reduced using smaller potentiometer conjunction with fixed resistors. example, Figure shows network that adjustment range.
4.7k 4.7k
00317-036
00317-035
UNITY-GAIN BUFFER APPLICATIONS
When input driven with fast, large signal pulse output waveform looks shown pulsed operation diagram (see Figure 37). During fast feedthrough-like portion output, input protection diodes effectively short output input, current, limited only output short-circuit protection, drawn signal generator. With output capable handling current requirements amplifier stays active mode smooth transition occurs. When pole created with amplifier's input capacitance that creates additional phase shift reduces phase margin. small capacitor parallel with eliminates this problem.
Figure Offset Voltage Adjustment
OP27
2.8V/s
00317-037
Figure Pulsed Operation
Rev. Page
OP27
COMMENTS NOISE
OP27 very noise, monolithic amp. outstanding input voltage noise characteristics OP27 achieved mainly operating input stage high quiescent current. input bias offset currents, which would normally increase, held reasonable values input bias current cancellation circuit. OP27A/E only 25°C respectively. This particularly important when input high source resistance. addition, many audio amplifier designers prefer direct coupling. high VOS, TCVOS previous designs have made direct coupling difficult, impossible, use. Voltage noise inversely proportional square root bias current, current noise proportional square root bias current. noise advantage OP27 disappears when high source resistors used. Figure Figure Figure compare observed total noise OP27 with noise performance other devices different circuit applications. Figure shows noise. Here picture less favorable; resistor noise negligible current noise becomes important because inversely proportional square root frequency. crossover with OP07 occurs range depending whether balanced unbalanced source resistors used error also spec).
OP08/108 5534 OP07
NOISE (nV)
OP27/37
e.g. e.g. UNMATCHED 10k, MATCHED 10k,
REGISTER NOISE ONLY
(Voltage Noise)2 Total Noise (Current Noise (Resistor Noise)
RS-SOURCE RESISTANCE
Figure Peak-to-Peak Noise (0.1 Source Resistance (Includes Resistor Noise)
Figure shows noise source resistance 1000 same plot applies wideband noise. this plot, multiply vertical scale square root bandwidth.
frequency applications, OP07 better than OP27/OP37 when only exception when gain error important. Figure illustrates noise. expected, results between previous figures.
TOTAL NOISE (nV/Hz)
OP08/108
e.g. e.g. UNMATCHED 10k, MATCHED 10k,
OP08/108
TOTAL NOISE (nV/Hz)
OP07
5534 OP27/37 REGISTER NOISE ONLY
OP07 5534
OP27/37
e.g. e.g.
UNMATCHED 10k, MATCHED 10k,
RS-SOURCE RESISTANCE
00317-038
Figure Noise Source Resistance (Including Resistor Noise) 1000
RS-SOURCE RESISTANCE
voltage noise OP27 maintained. With total noise increases dominated resistor noise rather than current voltage noise. only beyond that current noise starts dominate. argument made that current noise important applications with low-to-moderate source resistances. crossover between OP27 OP07 noise occurs region.
Figure Noise Source Resistance (Includes Resistor Noise) Audio Applications
Rev. Page
00317-040
REGISTER NOISE ONLY
00317-039
OP27
reference, typical source resistances some signal sources listed Table Table
Device Strain Gauge Magnetic Tape Head Source Impedance <500 <1500 Comments Typically used frequency applications. very important reduce self-magnetization problems when direct coupling used. OP27 neglected. Similar need direct coupled applications. OP27 does introduce selfmagnetization problems. Used rugged servo-feedback applications. Bandwidth interest kHz.
MOVING MAGNET CARTRIDGE INPUT 47.5k 150pF
220µF
100k
OP27
0.47µF
ROLLOFF
97.6k 7.87k
0.03µF 0.01µF
OUTPUT
Linear Variable Differential Transformer
<1500
Figure Phono Preamplifier Circuit
Table Open-Loop Gain
Frequency OP07 OP27 OP37
OP27 brings nV/Hz voltage noise 0.45 pA/Hz current noise this circuit. minimize noise from other sources, value generating voltage noise nV/Hz. noise increases nV/Hz amplifier only With source, circuit noise measures below reference level, unweighted, noise bandwidth. Gain circuit calculated expression:
AUDIO APPLICATIONS
Figure example phono pre-amplifier circuit using OP27 R1-R2-C1-C2 form very accurate RIAA network with standard component values. popular method accomplish RIAA phono equalization employ frequency dependent feedback around high quality gain block. Properly chosen, network provide three necessary time constants 3180 initial equalization accuracy stability, precision metal film resistors film capacitors polystyrene polypropylene recommended because they have voltage coefficients, dissipation factors, dielectric absorption. (high-k ceramic capacitors should avoided here, though low-k ceramics, such types that have excellent dissipation factors somewhat lower dielectric absorption, considered small values.)
0.101 values shown, gain just under dB). Lower gains accommodated increasing gains higher than show more equalization errors because gain bandwidth OP27. This circuit capable very distortion over entire range, generally below 0.01% levels rms. output levels, produces less than 0.03% total harmonic distortion frequencies kHz. Capacitor Resistor form simple octave rumble filter, with corner option, switch selected Shunt Capacitor nonpolarized electrolytic, bypasses frequency roll-off. Placing rumble filter's high-pass action after preamplifier desirable result discriminating against RIAA-amplified frequency noise components pickup produced frequency disturbances. preamplifier tape playback similar RIAA phono preamplifier, though more gain typically demanded, along with equalization requiring heavy frequency boost. circuit Figure readily modified tape use, shown Figure
Rev. Page
00317-041
Magnetic Phonograph Cartridges
<1500
1kHz GAIN 0.101 98.677 (39.9dB) SHOWN
OP27
TAPE HEAD 0.47µF
OP27
0.01µF
00317-042
3180µs 50µs
Noise performance this circuit limited more Input Resistors than amp, each generate nV/Hz noise, while generates nV/Hz noise. these predominant noise sources about nV/Hz, equivalent noise bandwidth, nearly below input signal. Measurements confirm this predicted performance.
316k
Figure Tape Head Preamplifier
While tape equalization requirement flat high frequency gain above amplifier need stabilized unity gain. decompensated OP37 provides greater bandwidth slew rate. many applications, idealized time constants shown require trimming optimize frequency response nonideal tape head performance other factors (see References section). network values configuration yield gain kHz, gain greater than Thus, worstcase output offset just over single 0.47 output capacitor block this level without affecting dynamic range. tape head coupled directly amplifier input, because worst-case bias current with inch head (such PRB2H7K) troublesome. Amplifier bias-current transients that magnetize head present potential tape head problem. OP27 OP37 free bias current transients upon power-up powerdown. always advantageous control speed power supply rise fall eliminate transients. addition, resistance head should carefully controlled preferably below this configuration, bias current induced offset voltage greater than maximum offset head resistance sufficiently controlled. simple, effective, fixed gain transformerless microphone preamp (Figure amplifies differential signals from impedance microphones input impedance Because high working gain circuit, OP37 helps preserve bandwidth, which kHz. OP37 decompensated device (minimum stable gain dummy resistor, necessary microphone unplugged. Otherwise, 100% feedback from open input cause amplifier oscillate. Common-mode input noise rejection will depend upon match bridge-resistor ratios. Either close tolerance (0.1%) types should used, should trimmed best CMRR. resistors should metal film types best stability noise.
IMPEDANCE MICROPHONE INPUT 200)
OP27/ OP37
316k
OUTPUT
Figure Fixed Gain Transformerless Microphone Preamplifier
applications demanding appreciably lower noise, high quality microphone transformer coupled preamplifier (Figure incorporates internally compensated OP27. JE115K-E transformer that provides optimum source resistance OP27 device. circuit overall gain product transformer's voltage setup amp's voltage gain.
1800pF 1100
OP27
OUTPUT
SOURCE
JENSEN 115K
JENSEN TRANSFORMERS
Figure High Quality Microphone Transformer Coupled Preamplifier
Gain trimmed other levels, desired, adjusting Because offset voltage OP27, output offset this circuit very low, less, gain. typical output blocking capacitor eliminated such cases, desirable higher gains eliminate switching transients.
+18V
OP27
-18V
Figure Burn-In Circuit
Rev. Page
00317-045
00317-044
00317-043
OP27
Capacitor Resistor form time constant this circuit, recommended optimum transient response transformer manufacturer. With use, must have unitygain stability. situations where time constant necessary, deleted, allowing faster OP37 employed. resistor gain resistors connected noiseless amplifier generate noise bandwidth, below reference level. practical amplifier only approach this noise level; never exceed With OP27 specified, additional noise degradation close -69.5 referenced mV).
REFERENCES
Lipshitz, RIAA Equalization Networks," JAES, Vol. June 1979, 458-481. Jung, Cookbook, 2nd. Ed., Sams Company, 1980. Jung, Audio Applications, 2nd. Ed., Sams Company, 1978. Jung, Marsh, "Picking Capacitors," Audio, February March, 1980. Otala, "Feedback-Generated Phase Nonlinearity Audio Amplifiers," London Convention, March 1980, preprint 1976. Stout, Kaufman, Handbook Operational Amplifier Circuit Design, York, McGraw-Hill, 1976.
Rev. Page
OP27 OUTLINE DIMENSIONS
0.400 (10.16) 0.365 (9.27) 0.355 (9.02)
0.280 (7.11) 0.250 (6.35) 0.240 (6.10)
0.100 (2.54) 0.210 (5.33) 0.150 (3.81) 0.130 (3.30) 0.115 (2.92) 0.022 (0.56) 0.018 (0.46) 0.014 (0.36) 0.070 (1.78) 0.060 (1.52) 0.045 (1.14) 0.060 (1.52) 0.015 (0.38) 0.015 (0.38) GAUGE PLANE SEATING PLANE
0.325 (8.26) 0.310 (7.87) 0.300 (7.62) 0.195 (4.95) 0.130 (3.30) 0.115 (2.92)
5.00 (0.1968) 4.80 (0.1890)
4.00 (0.1574) 3.80 (0.1497)
6.20 (0.2440) 5.80 (0.2284)
0.005 (0.13)
0.430 (10.92)
0.014 (0.36) 0.010 (0.25) 0.008 (0.20)
1.27 (0.0500) 0.25 (0.0098) 0.10 (0.0040)
1.75 (0.0688) 1.35 (0.0532)
0.50 (0.0196) 0.25 (0.0099)
0.51 (0.0201) COPLANARITY SEATING 0.31 (0.0122) 0.10 PLANE
0.25 (0.0098) 1.27 (0.0500) 0.40 (0.0157) 0.17 (0.0067)
COMPLIANT JEDEC STANDARDS MS-001-BA CONTROLLING DIMENSIONS INCHES; MILLIMETER DIMENSIONS PARENTHESES) ROUNDED-OFF INCH EQUIVALENTS REFERENCE ONLY APPROPRIATE DESIGN. CORNER LEADS CONFIGURED WHOLE HALF LEADS.
COMPLIANT JEDEC STANDARDS MS-012-AA CONTROLLING DIMENSIONS MILLIMETERS; INCH DIMENSIONS PARENTHESES) ROUNDED-OFF MILLIMETER EQUIVALENTS REFERENCE ONLY APPROPRIATE DESIGN.
Figure 8-Lead Plastic Dual-in-Line Package [PDIP] (N-8) P-Suffix Dimensions shown inches (millimeters)
0.005 (0.13)
Figure 8-Lead Standard Small Outline Package [SOIC] Narrow Body (R-8) S-Suffix Dimensions shown millimeters (inches)
0.055 (1.40)
0.310 (7.87) 0.220 (5.59)
REFERENCE PLANE 0.5000 (12.70) 0.2500 (6.35) 0.0500 (1.27)
0.1850 (4.70) 0.1650 (4.19)
0.1000 (2.54)
0.100 (2.54)
0.3700 (9.40) 0.3350 (8.51) 0.3350 (8.51) 0.3050 (7.75)
0.1600 (4.06) 0.1400 (3.56)
0.405 (10.29) 0.200 (5.08) 0.200 (5.08) 0.125 (3.18) 0.023 (0.58) 0.014 (0.36) 0.070 (1.78) 0.030 (0.76) 0.060 (1.52) 0.015 (0.38) 0.150 (3.81) SEATING PLANE
0.320 (8.13) 0.290 (7.37)
0.2000 (5.08) 0.1000 (2.54) 0.0190 (0.48) 0.0160 (0.41) 0.0210 (0.53) 0.0160 (0.41) BASE SEATING PLANE
0.0450 (1.14) 0.0270 (0.69)
0.015 (0.38) 0.008 (0.20)
0.0400 (1.02) 0.0400 (1.02) 0.0100 (0.25)
0.0340 (0.86) 0.0280 (0.71)
Figure 8-Lead Ceramic Glass Hermetic Seal [CERDIP] (Q-8) Z-Suffix Dimensions shown inches (millimeters)
Figure 8-Lead Metal [TO-99] (H-08) J-Suffix Dimensions shown inches (millimeters)
Rev. Page
022306-A
CONTROLLING DIMENSIONS INCHES; MILLIMETER DIMENSIONS PARENTHESES) ROUNDED-OFF INCH EQUIVALENTS REFERENCE ONLY APPROPRIATE DESIGN.
COMPLIANT JEDEC STANDARDS MO-002-AK CONTROLLING DIMENSIONS INCHES; MILLIMETER DIMENSIONS PARENTHESES) ROUNDED-OFF INCH EQUIVALENTS REFERENCE ONLY APPROPRIATE DESIGN.
OP27
ORDERING GUIDE
Model OP27AJ/883C OP27GJ OP27AZ OP27AZ/883C OP27EZ OP27GZ OP27EP OP27EPZ OP27GP OP27GPZ1 OP27GS OP27GS-REEL OP27GS-REEL7 OP27GSZ1 OP27GSZ-REEL1 OP27GSZ-REEL71 OP27NBC
Temperature Range -55° +125°C -40° +85°C -55° +125°C -55° +125°C -25° +85°C -40° +85°C +70°C +70°C -40° +85°C -40° +85°C -40° +85°C -40° +85°C -40° +85°C -40° +85°C -40° +85°C -40° +85°C
Package Description 8-Lead Metal (TO-99) 8-Lead Metal (TO-99) 8-Lead CERDIP 8-Lead CERDIP 8-Lead CERDIP 8-Lead CERDIP 8-Lead PDIP 8-Lead PDIP 8-Lead PDIP 8-Lead PDIP 8-Lead SOIC 8-Lead SOIC 8-Lead SOIC 8-Lead SOIC 8-Lead SOIC 8-Lead SOIC
Package Option J-Suffix (H-08) J-Suffix (H-08) Z-Suffix (Q-8) Z-Suffix (Q-8) Z-Suffix (Q-8) Z-Suffix (Q-8) P-Suffix (N-8) P-Suffix (N-8) P-Suffix (N-8) P-Suffix (N-8) S-Suffix (R-8) S-Suffix (R-8) S-Suffix (R-8) S-Suffix (R-8) S-Suffix (R-8) S-Suffix (R-8)
Pb-free part.
©2006 Analog Devices, Inc. rights reserved. Trademarks registered trademarks property their respective owners. C00317-0-5/06(F)
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noise: (0.1 Hz), nV/Hz drift: V/°C High speed: slew rate, gain bandwid

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