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Analog Devices Semiconductor Electronic Components Datasheet



AD625

Programmable Gain Instrumentation Amplifier



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AD625 pdf
a
FEATURES
User Programmed Gains of 1 to 10,000
Low Gain Error: 0.02% Max
Low Gain TC: 5 ppm/؇C Max
Low Nonlinearity: 0.001% Max
Low Offset Voltage: 25 V
Low Noise 4 nV/Hz (at 1 kHz) RTI
Gain Bandwidth Product: 25 MHz
16-Lead Ceramic or Plastic DIP Package,
20-Terminal LCC Package
Standard Military Drawing Available
MlL-Standard Parts Available
Low Cost
Programmable Gain
Instrumentation Amplifier
AD625
FUNCTIONAL BLOCK DIAGRAM
–INPUT
–GAIN
SENSE
–GAIN
DRIVE
50
–+
+GAIN
DRIVE
+GAIN
SENSE
+INPUT
50+
–+
VB
AD625
10k
10k
10k
+
10k
–+
SENSE
OUTPUT
REFERENCE
PRODUCT DESCRIPTION
The AD625 is a precision instrumentation amplifier specifically
designed to fulfill two major areas of application: 1) Circuits re-
quiring nonstandard gains (i.e., gains not easily achievable with
devices such as the AD524 and AD624). 2) Circuits requiring a
low cost, precision software programmable gain amplifier.
For low noise, high CMRR, and low drift the AD625JN is the
most cost effective instrumentation amplifier solution available.
An additional three resistors allow the user to set any gain from
1 to 10,000. The error contribution of the AD625JN is less than
0.05% gain error and under 5 ppm/°C gain TC; performance
limitations are primarily determined by the external resistors.
Common-mode rejection is independent of the feedback resistor
matching.
A software programmable gain amplifier (SPGA) can be config-
ured with the addition of a CMOS multiplexer (or other switch
network), and a suitable resistor network. Because the ON
resistance of the switches is removed from the signal path, an
AD625 based SPGA will deliver 12-bit precision, and can be
programmed for any set of gains between 1 and 10,000, with
completely user selected gain steps.
For the highest precision the AD625C offers an input offset
voltage drift of less than 0.25 µV/°C, output offset drift below
15 µV/°C, and a maximum nonlinearity of 0.001% at G = 1. All
grades exhibit excellent ac performance; a 25 MHz gain band-
width product, 5 V/µs slew rate and 15 µs settling time.
The AD625 is available in three accuracy grades (A, B, C) for
industrial (–40°C to +85°C) temperature range, two grades (J,
K) for commercial (0°C to +70°C) temperature range, and one
(S) grade rated over the extended (–55°C to +125°C) tempera-
ture range.
PRODUCT HIGHLIGHTS
1. The AD625 affords up to 16-bit precision for user selected
fixed gains from 1 to 10,000. Any gain in this range can be
programmed by 3 external resistors.
2. A 12-bit software programmable gain amplifier can be config-
ured using the AD625, a CMOS multiplexer and a resistor
network. Unlike previous instrumentation amplifier designs,
the ON resistance of a CMOS switch does not affect the gain
accuracy.
3. The gain accuracy and gain temperature coefficient of the
amplifier circuit are primarily dependent on the user selected
external resistors.
4. The AD625 provides totally independent input and output
offset nulling terminals for high precision applications. This
minimizes the effects of offset voltage in gain-ranging
applications.
5. The proprietary design of the AD625 provides input voltage
noise of 4 nV/Hz at 1 kHz.
6. External resistor matching is not required to maintain high
common-mode rejection.
REV. D
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
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, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2000



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AD625 pdf
AD625–SPECIFICATIONS (typical @ VS = ؎15 V, RL = 2 kand TA = + 25؇C, unless otherwise noted)
Model
GAIN
Gain Equation
Gain Range
Gain Error1
Nonlinearity, Gain = 1-256
Gain>256
Gain vs. Temp. Gain<10001
GAIN SENSE INPUT
Gain Sense Current
vs. Temperature
Gain Sense Offset Current
vs. Temperature
VOLTAGE OFFSET (May be Nulled)
Input Offset Voltage
vs. Temperature
Output Offset Voltage
vs. Temperature
Offset Referred to the
Input vs. Supply
G=1
G = 10
G = 100
G = 1000
INPUT CURRENT
Input Bias Current
vs. Temperature
Input Offset Current
vs. Temperature
INPUT
Input Impedance
Differential Resistance
Differential Capacitance
Common-Mode Resistance
Common-Mode Capacitance
Input Voltage Range
Differ. Input Linear (VDL)2
Common-Mode Linear (VCM)
Common-Mode Rejection Ratio dc to
60 Hz with 1 kSource Imbalance
G=1
G = 10
G = 100
G = 1000
OUTPUT RATING
DYNAMIC RESPONSE
Small Signal 3 dB
G = 1 (RF = 20 k)
G = 10
G = 100
G = 1000
Slew Rate
Settling Time to 0.01%, 20 V Step
G = 1 to 200
G = 500
G = 1000
AD625A/J/S
Min Typ Max
1
2 RF
RG
+1
10,000
± .035 ؎0.05
± 0.005
± 0.01
5
AD625B/K
Min Typ Max
1
2 RF
RG
+1
10,000
± 0.02 ؎0.03
± 0.002
± 0.008
5
300 500
5 20
150 500
2 15
150 250
2 15
75 250
1 10
50 200
1 2/2
45
20 50/50
25 50
0.25 0.50/1
23
10 25/40
70 75
85 95
95 100
100 110
± 30 ؎50
± 50
± 2 ؎35
± 20
75 85
90 100
105 110
110 120
± 20
± 50
±1
± 20
؎25
؎15
1
4
1
4
± 10
( )12V
G
2
× VD
1
4
1
4
± 10
( )12V
G
2
× VD
70 75
90 95
100 105
110 115
± 10 V
@ 5 mA
75 85
90 105
105 115
110 125
± 10 V
@ 5 mA
650 650
400 400
150 150
25 25
5.0 5.0
15 15
35 35
75 75
AD625C
Min Typ Max
1
2 RF
RG
+1
110,000
± 0.01 ؎0.02
± 0.001
± 0.005
5
50 100
2 10
50 100
2 10
10 25
0.1 0.25
12
10 15
80 90
95 105
110 120
115 140
± 10 ؎15
± 50
± 1 ؎5
± 20
1
4
1
4
± 10
( )12V
G
2
× VD
80 90
100 115
110 125
120 140
± 10 V
@ 5 mA
650
400
150
25
5.0
15
35
75
Unit
%
%
%
ppm/°C
nA
nA/°C
nA
nA/°C
µV
µV/°C
mV
µV/°C
dB
dB
dB
dB
nA
pA/°C
nA
pA/°C
G
pF
G
pF
V
dB
dB
dB
dB
kHz
kHz
kHz
kHz
V/µs
µs
µs
µs
–2– REV. D



Part Number AD625
Description Programmable Gain Instrumentation Amplifier
Maker Analog Devices - Analog Devices
Total Page 15 Pages
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