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
BAL
V+
BAL 1
OP27
OUT
–IN 2
Excellent CMRR: 126 dB at VCM of 11 V
High open-loop gain: 1.8 million
Fits OP07, 5534A sockets
NC
+IN 3
4V– (CASE)
NC = NO CONNECT
Available in die form
Figure 1. 8-Lead TO-99 (J-Suffix)
GENERAL DESCRIPTION
1
2
3
4
8
7
6
5
V
TRIM
V
TRIM
–IN
+IN
V–
OS
OS
OP27
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.
Exceptionally 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.
V+
OUT
NC
NC = NO CONNECT
Figure 2. 8-Lead CERDIP – Glass Hermetic Seal (Z-Suffix),
8-Lead PDIP (P-Suffix),
8-Lead SO (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+
C2
R3
1
R4
R2
1
8
Q6
Q22
Q46
C1
.
ADJ
V
1
OS
R23 R24
Q24
R1
Q21
Q23
R9
Q20 Q19
OUTPUT
R12
Q1A Q1B
Q2B Q2A
NONINVERTING
INPUT (+)
C3
C4
R5
Q3
Q26
INVERTING
INPUT (–)
Q45
Q11 Q12
Q27
Q28
1
R1 AND R2 ARE PERMANENTLY
ADJUSTED AT WAFER TEST FOR
MINIMUM OFFSET VOLTAGE
V–
Figure 3.
Rev. F
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2006 Analog Devices, Inc. All rights reserved.