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AD628 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD628
Beschreibung High Common-Mode Voltage Programmable Gain Difference Amplifier
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 20 Seiten
AD628 Datasheet, Funktion
High Common-Mode Voltage,
Programmable Gain Difference Amplifier
AD628
FEATURES
High common-mode input voltage range
±120 V at VS = ±15 V
Gain range 0.1 to 100
Operating temperature range: −40°C to +85°C
Supply voltage range
Dual supply: ±2.25 V to ±18 V
Single supply: 4.5 V to 36 V
Excellent ac and dc performance
Offset temperature stability RTI: 10 μV/°C maximum
Offset: ±1.5 V mV maximum
CMRR RTI: 75 dB minimum, dc to 500 Hz, G = +1
APPLICATIONS
High voltage current shunt sensing
Programmable logic controllers
Analog input front end signal conditioning
+5 V, +10 V, ±5 V, ±10 V, and 4 to 20 mA
Isolation
Sensor signal conditioning
Power supply monitoring
Electrohydraulic controls
Motor controls
GENERAL DESCRIPTION
The AD628 is a precision difference amplifier that combines
excellent dc performance with high common-mode rejection
over a wide range of frequencies. When used to scale high
voltages, it allows simple conversion of standard control
voltages or currents for use with single-supply ADCs. A
wideband feedback loop minimizes distortion effects due to
capacitor charging of Σ-Δ ADCs.
A reference pin (VREF) provides a dc offset for converting bipolar
to single-sided signals. The AD628 converts +5 V, +10 V, ±5 V,
±10 V, and 4 to 20 mA input signals to a single-ended output
within the input range of single-supply ADCs.
The AD628 has an input common mode and differential mode
operating range of ±120 V. The high common mode, input
impedance makes the device well suited for high voltage
measurements across a shunt resistor. The inverting input of
the buffer amplifier is available for making a remote Kelvin
connection.
FUNCTIONAL BLOCK DIAGRAM
REXT2
REXT1
+VS
7
6 RG
100k
–IN 8
100k
+IN 1
10k
G = +0.1
–IN
A1
+IN
10k
2
–VS
3
VREF
10k
4
CFILT
–IN
A2
+IN
OUT
5
AD628
Figure 1.
130
120
110
100
90
80
70
60
50
40
30
10
VS = ±15V
VS = ±2.5V
100 1k 10k
FREQUENCY (Hz)
Figure 2. CMRR vs. Frequency of the AD628
100k
A precision 10 kΩ resistor connected to an external pin is
provided for either a low-pass filter or to attenuate large
differential input signals. A single capacitor implements a low-
pass filter. The AD628 operates from single and dual supplies
and is available in an 8-lead SOIC_N or an 8-lead MSOP. It
operates over the standard industrial temperature range of
−40°C to +85°C.
Rev. G
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. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2002–2007 Analog Devices, Inc. All rights reserved.






AD628 Datasheet, Funktion
AD628
Parameter
POWER SUPPLY
Operating Range
Quiescent Current
TEMPERATURE RANGE
Conditions
AD628AR
Min Typ Max
±2.25
−40
+36
1.6
+85
1 To use a lower gain, see the Gain Adjustment section.
2 The addition of the difference amplifier and output amplifier offset voltage does not exceed this specification.
⎡⎤
3 Error due to common mode as seen at the
output:
VOUT
=
(0.1)(VCM
75
)
×
[Output
Amplifier Gain]
.
⎢⎣ 10 20 ⎥⎦
4 Greater values of voltage are possible with greater or lesser values of VREF.
⎡⎤
5
Error
due
to
common
mode
as
seen
at the
output
of
A1:
VOUT
A1 =
(0.1)(VCM
75
)
.
⎢⎣ 10 20 ⎥⎦
AD628ARM
Min Typ Max
±2.25
−40
+36
1.6
+85
Unit
V
mA
°C
Rev. G | Page 6 of 20

6 Page









AD628 pdf, datenblatt
AD628
100
90
5V
10mV
10
0
100µs
Figure 23. Settling Time to 0.01%, 0 V to 10 V Step
100
90
5V
10mV
10
0
100µs
Figure 24. Settling Time to 0.01% 0 V to −10 V Step
Rev. G | Page 12 of 20

12 Page





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