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OP27 Datasheet, PDF (1/16 Pages) Analog Devices – Low-Noise, Precision Operational Amplifier
a
FEATURES
Low Noise: 80 nV p-p (0.1 Hz to 10 Hz), 3 nV/√Hz
Low Drift: 0.2 ␮V/؇C
High Speed: 2.8 V/␮s Slew Rate, 8 MHz Gain
Bandwidth
Low VOS: 10 ␮V
Excellent CMRR: 126 dB at VCM of ±11 V
High Open-Loop Gain: 1.8 Million
Fits 725, OP07, 5534A Sockets
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 drift of 0.6 µV/°C maximum 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/µsec slew rate
provides 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 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 7)
Low-Noise, Precision
Operational Amplifier
OP27
PIN CONNECTIONS
TO-99
(J-Suffix)
BAL
BAL 1
–IN 2
OP27
V+
OUT
+IN 3
NC
4V– (CASE)
NC = NO CONNECT
8-Pin Hermetic DIP
(Z-Suffix)
Epoxy Mini-DIP
(P-Suffix)
8-Pin SO
(S-Suffix)
VOS TRIM 1
–IN 2
+IN 3
V– 4
OP27
8 VOS TRIM
7 V+
6 OUT
5 NC
NC = NO CONNECT
R3
Q6
R1*
18
R4
VOS ADJ.
R2*
NONINVERTING
INPUT (+)
INVERTING
INPUT (–)
Q1A Q1B
Q3
*R1 AND R2 ARE PERMANENTLY
ADJUSTED AT WAFER TEST FOR
MINIMUM OFFSET VOLTAGE.
Q2B Q2A
C2
R23 R24
Q22
C1
Q21
Q23
Q24
R9
Q20 Q19
R12
R5
C3
C4
Q11 Q12
Q26
Q27
Q28
V+
Q46
OUTPUT
Q45
V–
REV. A
Figure 1. Simplified Schematic
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. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2002