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OP27AZ-883C

Low Noise, Precision Operational Amplifier

Analog Devices 

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

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, en = 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.

BAL

BAL 1

–IN 2

OP27

V+

OUT

+IN 3

NC

4V– (CASE)

NC = NO CONNECT

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

VOS TRIM 1

–IN 2

+IN 3

V– 4

OP27

8 VOS TRIM

7 V+

6 OUT

5 NC

NC = NO CONNECT

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

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

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 IB and IOS 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)

FUNCTIONAL BLOCK DIAGRAM

V+

R3

Q6

18

R4

C2

R11

VOS ADJ.

R21

R23 R24

Q22

C1

Q46

Q21

NONINVERTING

INPUT (+)

INVERTING

INPUT (–)

Q1A Q1B

Q3

Q2B Q2A

Q23

Q24

R9

Q20 Q19

R12

R5

C3

C4

Q26

Q11 Q12

Q27

Q28

OUTPUT

Q45

1 R1 AND R2 ARE PERMANENTLY

ADJUSTED AT WAFER TEST FOR

MINIMUM OFFSET VOLTAGE

V–

Figure 3.

Rev. H

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