Datasheet

a

Micropower, Single and Dual Supply
Rail-to-Rail Instrumentation Amplifier
AD627

FEATURES
Micropower, 85 A Max Supply Current
Wide Power Supply Range (+2.2 V to 18 V)
Easy to Use
Gain Set with One External Resistor
Gain Range 5 (No Resistor) to 1,000
Higher Performance than Discrete Designs
Rail-to-Rail Output Swing
High Accuracy DC Performance
0.10% Gain Accuracy (G = +5)(AD627A)
10 ppm Gain Drift (G = +5)
125 V Max Input Offset Voltage (AD627B)
200 V Max Input Offset Voltage (AD627A)
1 V/ C Max Input Offset Voltage Drift (AD627B)
3 V/ C Max Input Offset Voltage Drift (AD627A)
10 nA Max Input Bias Current
Noise: 38 nV/ √Hz RTI Noise @ 1 kHz (G = +100)
Excellent AC Specifications
77 dB Min CMRR (G = +5) (AD627A)
83 dB Min CMRR (G = +5) (AD627B)
80 kHzBandwidth (G = +5)
135 s Settling Time to 0.01% (G = +5, 5 V Step)
APPLICATIONS
4 mA-to-20 mA Loop Powered Applications
Low Power Medical Instrumentation—ECG, EEG
Transducer Interfacing
Thermocouple Amplifiers
Industrial Process Controls
Low Power Data Acquisition
Portable Battery Powered Instruments

FUNCTIONAL BLOCK DIAGRAM
8-Lead Plastic DIP (N) and SOIC (R)
RG 1

8

RG

–IN 2

7+VS

+IN 3

6

OUTPUT

–VS 4

5

REF

AD627

Wide supply voltage range (+2.2 V to ± 18 V), and micropower
current consumption make the AD627 a perfect fit for a wide
range of applications. Single supply operation, low power consumption and rail-to-rail output swing make the AD627 ideal for
battery powered applications. Its rail-to-rail output stage maximizes dynamic rangewhen operating from low supply voltages.
Dual supply operation (± 15 V) and low power consumption make
the AD627 ideal for industrial applications, including 4 mA-to20 mA loop-powered systems.
The AD627 does not compromise performance, unlike other
micropower instrumentation amplifiers. Low voltage offset, offset
drift, gain error, and gain drift keep dc errors to a minimum in
the users system.The AD627 also holds errors over frequency
to a minimum by providing excellent CMRR over frequency.
Line noise, as well as line harmonics, will be rejected, since
the CMRR remains high up to 200 Hz.
The AD627 provides superior performance, uses less circuit board
area and does it for a lower cost than micropower discrete designs.
100

AD627
90

PRODUCT DESCRIPTION

The AD627 offerssuperior user flexibility by allowing the user
to set the gain of the device with a single external resistor, and
by conforming to the 8-lead industry standard pinout configuration. With no external resistor, the AD627 is configured for a
gain of 5. With an external resistor, it can be programmed for
gains of up to 1000.

80
70
CMRR – dB

The AD627 is an integrated, micropower,instrumentation
amplifier that delivers rail-to-rail output swing on single and
dual (+2.2 V to ± 18 V) supplies. The AD627 provides the user
with excellent ac and dc specifications while operating at only
85 µA max.

60
50
TRADITIONAL
LOW POWER
DISCRETE DESIGN

40
30
20
10
0
1

10

100
FREQUENCY – Hz

1k

10k

Figure 1. CMRR vs. Frequency, ± 5 VS, Gain = +5

R EV. BInformation 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
which 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, MA02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2001

AD627–SPECIFICATIONS
SINGLE SUPPLY (Typical @ 25 C Single Supply, V = 3 V and 5 V and R = 20 k

, unless otherwise noted.)

Model
Specification

Max

Min

1000

5

S

GAIN
Gain Range
Gain Error1
G = +5
G = +10
G = +100
G = +1000
Nonlinearity
G =...