AD629A AD [Analog Devices], AD629A Datasheet

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AD629A

Manufacturer Part Number
AD629A
Description
High Common-Mode Voltage Difference Amplifier
Manufacturer
AD [Analog Devices]
Datasheet

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a
REV. A
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.
Figure 1. Common-Mode Rejection Ratio vs. Frequency
FEATURES
Improved Replacement for:
Input Protection to:
Wide Power Supply Range ( 2.5 V to
1 mA Max Power Supply Current
HIGH ACCURACY DC PERFORMANCE
3 ppm Max Gain Nonlinearity
20 V/ C Max Offset Drift (AD629A)
10 V/ C Max Offset Drift (AD629B)
10 ppm/ C Max Gain Drift
EXCELLENT AC SPECIFICATIONS
77 dB Min CMRR @ 500 Hz (AD629A)
86 dB Min CMRR @ 500 Hz (AD629B)
500 kHz Bandwidth
APPLICATIONS
High Voltage Current Sensing
Battery Cell Voltage Monitor
Power Supply Current Monitor
Motor Control
Isolation
270 V Common-Mode Voltage Range
10 V Output Swing on
INA117P and INA117KU
100
500 V Common Mode
500 V Differential
95
90
85
80
75
70
65
60
55
50
20
100
FREQUENCY – Hz
12 V Supply
1k
18 V)
10k
20k
GENERAL DESCRIPTION
The AD629 is a difference amplifier with a very high input
common-mode voltage range. It is a precision device that
allows the user to accurately measure differential signals in the
presence of high common-mode voltages up to ± 270 V.
The AD629 can replace costly isolation amplifiers in applications
that do not require galvanic isolation. The device will operate
over a ± 270 V common-mode voltage range and has inputs
that are protected from common-mode or differential mode
transients up to ± 500 V.
The AD629 has low offset, low offset drift, low gain error drift,
as well as low common-mode rejection drift, and excellent CMRR
over a wide frequency range.
The AD629 is available in low-cost, plastic 8-lead DIP and
SOIC packages. For all packages and grades, performance is
guaranteed over the entire industrial temperature range from
–40°C to +85°C.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
Figure 2. Common-Mode Operating Range. Error Voltage
vs. Input Common-Mode Voltage
8-Lead Plastic Mini-DIP (N) and SOIC (R) Packages
High Common-Mode Voltage
FUNCTIONAL BLOCK DIAGRAM
–240
REF(–)
–V
–IN
+IN
2mV/DIV
S
COMMON-MODE VOLTAGE – Volts
World Wide Web Site: http://www.analog.com
1
2
3
4
–120
21.1k
380k
Difference Amplifier
380k
NC = NO CONNECT
AD629
380k
20k
0
© Analog Devices, Inc., 2000
8
7
6
5
120
NC
+V
OUTPUT
REF(+)
60V/DIV
S
AD629
240

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AD629A Summary of contents

Page 1

... Max Gain Nonlinearity Max Offset Drift (AD629A Max Offset Drift (AD629B) 10 ppm/ C Max Gain Drift EXCELLENT AC SPECIFICATIONS 77 dB Min CMRR @ 500 Hz (AD629A Min CMRR @ 500 Hz (AD629B) 500 kHz Bandwidth APPLICATIONS High Voltage Current Sensing Battery Cell Voltage Monitor ...

Page 2

... Stable Operation p-p OUT 0.01 Step OUT 0.1 Step OUT 0.01 Step DIFF OUT MIN MAX MIN MAX –2– AD629A AD629B Min Typ Max Min Typ 1 1 0.01 0.05 0. 0 100 90 ...

Page 3

... AD629AR-REEL 2 AD629AR-REEL7 AD629BR 1 AD629BR-REEL 2 AD629BR-REEL7 AD629AN AD629BN NOTES 1 13" Tape and Reel of 2500 each 2 7" Tape and Reel of 1000 each CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. ...

Page 4

AD629 –Typical Performance Characteristics 100 100 1k 10k 100k FREQUENCY – Hz Figure 5. Common-Mode Rejection Ratio vs. Frequency 2mV/DIV V = 18V 15V ...

Page 5

V – Volts OUT Figure 11. Gain Nonlinearity –10 –8 –6 –4 – – Volts OUT Figure 12. Gain Nonlinearity –3.0 –2.4 –1.8 –1.2 –0.6 0 0.6 V – Volts ...

Page 6

AD629 +85 C 4.5 3.5 –40 C 2.5 + 0.5 S –2.0 –2.5 –40 C –3.0 –3.5 +25 C +85 C –4 OUTPUT CURRENT – mA Figure 17. ...

Page 7

V OUT 0V OUTPUT ERROR 1mV/DIV Figure 23. Settling Time to 0.01%, For Output = 2 k Ω Step – 350 N = 2180 n 200 PCS. FROM 300 ...

Page 8

AD629 APPLICATIONS Basic Connections Figure 29 shows the basic connections for operating the AD629 with a dual supply. A supply voltage of between ± and ± applied between Pins 7 and 4. Both supplies should ...

Page 9

ANALOG POWER SUPPLY –5V +5V GND 0.1 F 0 AGND DGND DD +V – +IN AD7892-2 AD629 V V OUT IN1 –IN V REF(–) REF(+) IN2 Figure 31. Optimal Grounding Practice for a Bipolar ...

Page 10

AD629 Output Current and Buffering The AD629 is designed to drive loads of 2 kΩ to within the rails, but can deliver higher output currents at lower output voltages (see Figure 15). If higher output current is ...

Page 11

OUTPUT CURRENT REF(–) 21.1k 10 AMPS 1 200V GROUND 380k – SHUNT 380k +IN 3 60Hz – POWER LINE AD629 0 CONNECT Figure 37. Error Budget Analysis Example 1. ...

Page 12

AD629 8-Lead Plastic DIP (N-8) 0.430 (10.92) 0.348 (8.84 0.280 (7.11) 0.240 (6.10 0.325 (8.25) PIN 1 0.100 (2.54) 0.300 (7.62) BSC 0.060 (1.52) 0.210 0.015 (0.38) (5.33) MAX 0.130 0.160 (4.06) (3.30) MIN 0.115 (2.93) ...

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