Dual Very Low Noise Precision
Operational Amplifier
a
OP270
CONNECTION DIAGRAMS
FEATURES
Very Low Noise 5 nV/÷Hz @ 1 kHz Max
Excellent Input Offset Voltage 75 V Max
Low Offset Voltage Drift 1 V/؇C Max
Very High Gain 1500 V/mV Min
Outstanding CMR 106 dB Min
Slew Rate 2.4 V/s Typ
16-Lead SOIC
(S-Suffix)
8-Lead PDIP (P-Suffix)
8-Lead CERDIP
(Z-Suffix)
16
15
14
13
1
2
3
4
5
6
7
8
–IN A
+IN A
NC
OUT A
NC
8
7
6
5
1
2
3
4
OUT A
–IN A
+IN A
V–
V+
NC
Gain Bandwidth Product 5 MHz Typ
Industry-Standard 8-Lead Dual Pinout
OUT B
–IN B
+IN B
A
B
V–
V+
OP270
NC
12 NC
GENERAL DESCRIPTION
OP270
11
10
9
+IN B
–IN B
NC
NC
The OP270 is a high performance, monolithic, dual operational
amplifier with exceptionally low voltage noise, 5 nV/÷Hz max at
1 kHz. It offers comparable performance to ADI’s industry
standard OP27.
OUT B
NC
NC = NO CONNECT
The OP270 features an input offset voltage below 75 mV and an
offset drift under 1 mV/∞C, guaranteed over the full military tem-
perature range. Open-loop gain of the OP270 is over 1,500,000
into a 10 kW load, ensuring excellent gain accuracy and linearity,
even in high gain applications. Input bias current is under 20 nA,
which reduces errors due to signal source resistance. The OP270’s
CMR of over 106 dB and PSRR of less than 3.2 mV/V signifi-
cantly reduce errors due to ground noise and power supply
fluctuations. Power consumption of the dual OP270 is one-third
less than two OP27s, a significant advantage for power conscious
applications. The OP270 is unity-gain stable with a gain bandwidth
product of 5 MHz and a slew rate of 2.4 V/ms.
The OP270 offers excellent amplifier matching, which is important
for applications such as multiple gain blocks, low noise instru-
mentation amplifiers, dual buffers, and low noise active filters.
The OP270 conforms to the industry-standard 8-lead DIP pinout.
It is pin compatible with the MC1458, SE5532/A, RM4558, and
HA5102 dual op amps, and can be used to upgrade systems
using those devices.
For higher speed applications, the OP271, with a slew rate of
8 V/ms, is recommended. For a quad op amp, see the OP470.
SIMPLIFIED SCHEMATIC
(One of Two Amplifiers Is Shown)
V+
BIAS
OUT
+IN
–IN
V–
REV. C
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
www.analog.com
© 2003 Analog Devices, Inc. All rights reserved.
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