Datasheet

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Low Noise, Precision

Operational Amplifier

Data Sheet

OP27

Rev. H Document Feedback

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FEATURES

Low noise: 80 nV p-p (0.1 Hz to 10 Hz), 3 nV/√Hz

Low drift: 0.2 µV/°C

High speed: 2.8 V/µs slew rate, 8 MHz gain bandwidth

Low V

: 10 µV

CMRR: 126 dB at VCM of ±11 V

High open-loop gain: 1.8 million

Available in die form

GENERAL DESCRIPTION

The OP27 precision operational amplifier combines the low

offset and drift of the

OP07 with both high speed and low noise.

Offsets down to 25 µV and maximum drift of 0.6 µV/°C make

the

OP27 ideal for precision instrumentation applications. Low

noise, e

= 3.5 nV/√Hz, at 10 Hz, a low 1/f noise corner

frequency of 2.7 Hz, and high gain (1.8 million), allow accurate

high-gain amplification of low-level signals. A gain bandwidth

product of 8 MHz and a 2.8 V/µs slew rate provide excellent

dynamic accuracy in high speed, data-acquisition systems.

A low input bias current of ±10 nA is achieved by use of a bias

current cancellation circuit. Over the military temperature

range, this circuit typically holds I

and I

to ±20 nA and 15 nA,

respectively.

The output stage has good load driving capability. A guaranteed

swing of ±10 V into 600 Ω and low output distortion make the

OP27 an excellent choice for professional audio applications.

(Continued on Page 3)

PIN CONFIGURATIONS

V+

OUT

4V– (CASE)

BAL

BAL 1

–IN 2

+IN 3

OP27

NC = NO CONNECT

00317-001

Figure 1. 8-Lead TO-99 (J-Suffix)

NC = NO CONNECT

TRIM

–IN

+IN

TRIM

V+

OUT

NCV–

OP27

00317-002

Figure 2. 8-Lead CERDIP – Glass Hermetic Seal (Z-Suffix),

8-Lead PDIP (P-Suffix), and 8-Lead SOIC (S-Suffix)

FUNCTIONAL BLOCK DIAGRAM

ADJ.

NONINVERTING

INPUT (+)

INVERTING

INPUT (

–)

V–

V+

Q2B

Q2A

Q1A Q1B

1 8

R1 AND R2 ARE PERMANENTLY

ADJUSTED AT WAFER TEST FOR

MINIMUM OFFSET VOLTAGE

Q21

R23 R24

Q23

Q24

Q22

Q11 Q12

Q27 Q28

R12

C3 C4

Q26

Q20 Q19

Q46

Q45

OUTPUT

00317-003

Figure 3.

Summary of content (21 pages)

PAGE 1
Data Sheet Low Noise, Precision Operational Amplifier OP27 FEATURES PIN CONFIGURATIONS Low noise: 80 nV p-p (0.1 Hz to 10 Hz), 3 nV/√Hz Low drift: 0.2 µV/°C High speed: 2.8 V/µs slew rate, 8 MHz gain bandwidth Low VOS: 10 µV CMRR: 126 dB at VCM of ±11 V High open-loop gain: 1.8 million Available in die form BAL BAL 1 OP27 V+ OUT –IN 2 00317-001 NC +IN 3 4V– (CASE) NC = NO CONNECT GENERAL DESCRIPTION Figure 1.
PAGE 2
OP27 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Typical Performance Characteristics ..............................................8 General Description ......................................................................... 1 Applications Information .............................................................. 14 Pin Configurations ...........................................................................
PAGE 3
Data Sheet OP27 GENERAL DESCRIPTION (Continued from Page 1) PSRR and CMRR exceed 120 dB. These characteristics, coupled with long-term drift of 0.2 µV/month, allow the circuit designer to achieve performance levels previously attained only by discrete designs. Low cost, high volume production of OP27 is achieved by using an on-chip Zener zap-trimming network. This reliable and stable offset trimming scheme has proven its effectiveness over many years of production history.
PAGE 4
OP27 Data Sheet SPECIFICATIONS ELECTRICAL CHARACTERISTICS VS = ±15 V, TA = 25°C, unless otherwise noted. Table 1.
PAGE 5
Data Sheet OP27 VS = ±15 V, −55°C ≤ TA ≤ 125°C, unless otherwise noted. Table 2. Parameter INPUT OFFSET VOLTAGE1 AVERAGE INPUT OFFSET DRIFT Symbol VOS TCVOS2 TCVOSn3 IOS IB IVR CMRR PSRR AVO VO INPUT OFFSET CURRENT INPUT BIAS CURRENT INPUT VOLTAGE RANGE COMMON-MODE REJECTION RATIO POWER SUPPLY REJECTION RATIO LARGE SIGNAL VOLTAGE GAIN OUTPUT VOLTAGE SWING Test Conditions VCM = ±10 V VS = ±4.5 V to ±18 V RL ≥ 2 kΩ, VO = ±10 V RL ≥ 2 kΩ Min OP27A Typ 30 ±10.3 108 0.2 15 ±20 ±11.5 122 2 1200 ±13.
PAGE 6
OP27 Data Sheet TYPICAL ELECTRICAL CHARACTERISTICS VS = ±15 V, TA = 25°C unless otherwise noted. Table 4. Parameter AVERAGE INPUT OFFSET VOLTAGE DRIFT1 AVERAGE INPUT OFFSET CURRENT DRIFT AVERAGE INPUT BIAS CURRENT DRIFT INPUT NOISE VOLTAGE DENSITY Symbol TCVOS or TCVOSn TCIOS TCIB en Test Conditions Nulled or unnulled, RP = 8 kΩ to 20 kΩ INPUT NOISE CURRENT DENSITY in INPUT NOISE VOLTAGE SLEW RATE enp-p SR GBW fO = 10 Hz fO = 30 Hz fO = 1000 Hz 0.
PAGE 7
Data Sheet OP27 ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE Table 5. Parameter Supply Voltage Input Voltage1 Output Short-Circuit Duration Differential Input Voltage2 Differential Input Current2 Storage Temperature Range Operating Temperature Range OP27A (J, Z) OP27E (Z) OP27E (P) OP27G (P, S, J, Z) Lead Temperature Range (Soldering, 60 sec) Junction Temperature Rating ±22 V ±22 V Indefinite ±0.
PAGE 8
OP27 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS 100 10 TA = 25qC VS = r15V RMS VOLTAGE NOISE (PV) 90 70 60 50 1 0.1 TEST TIME OF 10sec FURTHER LIMITS LOW FREQUENCY (<0.1Hz) GAIN 30 0.01 0.1 1 10 100 FREQUENCY (Hz) 0.01 100 00317-004 40 Figure 4. 0.1 Hz to 10 Hz p-p Noise Tester Frequency Response 1k 10k 100k BANDWIDTH (Hz) 00317-007 GAIN (dB) 80 Figure 7. Input Wideband Voltage Noise vs. Bandwidth (0.
PAGE 9
Data Sheet OP27 5 60 TA = 25qC OP27C 50 OP27A 30 OFFSET VOLTAGE (PV) AT 10Hz 3 AT 1kHz 2 20 10 OP27A 0 –10 OP27A –20 –30 –40 TRIMMING WITH 10k: POT DOES NOT CHANGE TCVOS –50 –60 0 10 20 30 40 TOTAL SUPPLY VOLTAGE, V+ – V–, (V) –70 –75 00317-010 1 –50 –25 OP27C 0 25 50 75 100 125 150 175 TEMPERATURE (qC) 00317-013 VOLTAGE NOISE (nV/Hz) 40 4 Figure 13. Offset Voltage Drift of Five Representative Units vs. Temperature Figure 10. Voltage Noise Density vs.
PAGE 10
OP27 Data Sheet 30 130 VS = r15V 110 TA = 70qC 20 15 THERMAL SHOCK RESPONSE BAND 70 50 30 5 0 20 40 60 80 100 TIME (Sec) –10 00317-016 0 –20 1 10 PHASE MARGIN (Degrees) VS = r15V 100k 1M 10M 100M 30 10 )M 70 VS = r15V 9 60 GBW 50 8 4 SLEW RATE (V/PS) 20 OP27C 10 0 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (qC) –75 –50 –25 0 25 50 75 100 6 125 TEMPERATURE (qC) Figure 20. Slew Rate, Gain Bandwidth Product, Phase Margin vs. Temperature Figure 17.
PAGE 11
Data Sheet OP27 2.5 VS = r15V VIN = 100mV AV = +1 100 TA = 25qC 80 RL = 2k: % OVERSHOOT 1.5 RL = 1k: 1.0 60 40 20 0.5 0 10 20 30 40 50 TOTAL SUPPLY VOLTAGE (V) 0 00317-022 0 0 500 1000 1500 2000 2500 CAPACITIVE LOAD (pF) Figure 22. Open-Loop Voltage Gain vs. Supply Voltage Figure 25. Small-Signal Overshoot vs.
PAGE 12
OP27 Data Sheet 60 50 0.1mF N 40 ISC (+) OP27 D.U.T. 30 ISC (–) N VOLTAGE GAIN = 50,000 20 AD8677 1 2 3 4 5 TIME FROM OUTPUT SHORTED TO GROUND (Min) Figure 28. Short-Circuit Current vs. Time Figure 31. Voltage Noise Test Circuit (0.1 Hz to 10 Hz) 2.4 VS = r15V TA = 25qC VCM = r10V 120 CMRR (dB) TA = 25qC VS = r15V 2.2 OPEN-LOOP VOLTAGE GAIN (V/PV) 140 N 0.1mF 2.2mF N 00317-028 0 SCOPE ´ 1 RIN 0 N 4.
PAGE 13
Data Sheet OP27 160 120 100 NEGATIVE SWING 80 60 POSITIVE SWING 40 20 0 1 10 100 1k 10k 100k 1M FREQUENCY (Hz) 10M 100M 00317-034 POWER SUPPLY REJECTION RATIO (dB) TA = 25qC 140 Figure 34. PSRR vs. Frequency Rev.
PAGE 14
OP27 Data Sheet APPLICATIONS INFORMATION OP27 series units can be inserted directly into OP07 sockets with or without removal of external compensation or nulling components. OP27 offset voltage can be nulled to 0 (or another desired setting) using a potentiometer (see Figure 35). The OP27 provides stable operation with load capacitances of up to 2000 pF and ±10 V swings; larger capacitances should be decoupled with a 50 Ω resistor inside the feedback loop. The OP27 is unity-gain stable.
PAGE 15
Data Sheet OP27 1k OP08/108 500 OP07 Voltage noise is inversely proportional to the square root of bias current, but current noise is proportional to the square root of bias current. The noise advantage of the OP27 disappears when high source resistors are used. Figure 38, Figure 39, Figure 40 compare the observed total noise of the OP27 with the noise performance of other devices in different circuit applications.
PAGE 16
OP27 Data Sheet For reference, typical source resistances of some signal sources are listed in Table 7. MOVING MAGNET CARTRIDGE INPUT Magnetic Tape Head Source Impedance <500 Ω <1500 Ω Magnetic Phonograph Cartridges <1500 Ω Linear Variable Differential Transformer <1500 Ω 3 Comments Typically used in low frequency applications. Low is very important to reduce self-magnetization problems when direct coupling is used. OP27 IB can be neglected. Similar need for low IB in direct coupled applications.
PAGE 17
Data Sheet OP27 + TAPE HEAD RA CA sources is about 6 nV/√Hz, equivalent to 0.9 µV in a 20 kHz noise bandwidth, or nearly 61 dB below a 1 mV input signal. Measurements confirm this predicted performance. 0.47µF OP27 – N R1 N R2 N R1 N C1 5mF R3 N R6 0.01µF LOW IMPEDANCE MICROPHONE INPUT = T2 Figure 43.
PAGE 18
OP27 Data Sheet A 150 Ω resistor and R1 and R2 gain resistors connected to a noiseless amplifier generate 220 nV of noise in a 20 kHz bandwidth, or 73 dB below a 1 mV reference level. Any practical amplifier can only approach this noise level; it can never exceed it. With the OP27 and T1 specified, the additional noise degradation is close to 3.6 dB (or −69.5 referenced to 1 mV). REFERENCES 1. Lipshitz, S. R, “On RIAA Equalization Networks,” JAES, Vol. 27, June 1979, p. 458–481. 2. Jung, W. G.
PAGE 19
Data Sheet OP27 OUTLINE DIMENSIONS 0.400 (10.16) 0.365 (9.27) 0.355 (9.02) 8 5 1 0.280 (7.11) 0.250 (6.35) 0.240 (6.10) 4 0.100 (2.54) BSC 0.325 (8.26) 0.310 (7.87) 0.300 (7.62) 0.060 (1.52) MAX 0.210 (5.33) MAX 0.015 (0.38) MIN 0.150 (3.81) 0.130 (3.30) 0.115 (2.92) SEATING PLANE 0.022 (0.56) 0.018 (0.46) 0.014 (0.36) 0.195 (4.95) 0.130 (3.30) 0.115 (2.92) 0.015 (0.38) GAUGE PLANE 0.014 (0.36) 0.010 (0.25) 0.008 (0.20) 0.430 (10.92) MAX 0.005 (0.
PAGE 20
OP27 Data Sheet 5.00 (0.1968) 4.80 (0.1890) 8 4.00 (0.1574) 3.80 (0.1497) 1 5 6.20 (0.2441) 5.80 (0.2284) 4 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040) COPLANARITY 0.10 SEATING PLANE 1.75 (0.0688) 1.35 (0.0532) 0.51 (0.0201) 0.31 (0.0122) 0.50 (0.0196) 0.25 (0.0099) 45° 8° 0° 1.27 (0.0500) 0.40 (0.0157) 0.25 (0.0098) 0.17 (0.
PAGE 21
Data Sheet OP27 ORDERING GUIDE Model1 OP27AJ/883C OP27GJZ OP27AZ OP27AZ/883C OP27EZ OP27GZ OP27EPZ OP27GPZ OP27GS OP27GS-REEL7 OP27GSZ OP27GSZ-REEL OP27GSZ-REEL7 OP27NBC 1 Temperature Range −55°C to +125°C −40°C to +85°C −55°C to +125°C −55°C to +125°C −25°C to +85°C −40°C to +85°C 0°C to +70°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C Package Description 8-Lead Metal Can (TO-99) 8-Lead Metal Can (TO-99) 8-Lead CERDIP 8-Lead CERDIP 8-Lead CERDIP 8-Lead CER