High Common-Mode Voltage,
Single-Supply
Difference Amplifier
Preliminary Technical Data
AD8203
FEATURES
FUNCTIONAL BLOCK DIAGRAM
+V
6
NC
7
A1
3
A2
4
High common-mode voltage range −12 V to +30 V at
a 5 V supply voltage
S
AD8200
AD8203
Operating temperature range
−40°C to +150°C
Supply voltage range: 3.5 V to 12 V
Low-pass filter (one pole or two pole)
100kΩ
G = ×10
+IN
A1
–IN
G = ×2
+IN
A2
–IN
8
1
+IN
–IN
5
OUT
10kΩ
10kΩ
EXCELLENT AC AND DC PERFORMANCE
200kΩ
200kΩ
±1 mV voltage offset
±1 ppm/°C typ gain drift
77 dB CMRR min dc to 10 kHz
2
NC = NO CONNECT
GND
PLATFORMS
Figure 1. SOIC (R) Package Die Form
Transmission control
Diesel injection control
Engine management
Adaptive suspension control
Vehicle dynamics control
INDUCTIVE
LOAD
5V
CLAMP
DIODE
OUTPUT
GENERAL DESCRIPTION
+IN
NC +V
OUT
S
The AD8203 is a single-supply difference amplifier for
amplifying and low-pass filtering small differential voltages in
the presence of a large common-mode voltage. The input CMV
range extends from −12 V to +30 V at a typical supply voltage of
5 V.
BATTERY
14V
4 TERM
SHUNT
AD8200
AD8203
–IN GND A1
A2
POWER
DEVICE
The AD8203 is offered in die and packaged form. Both
package options are specified over wide temperature ranges,
making the AD8203 well suited for use in many automotive
platforms. The AD8203 is specified over a temperature range
of −40°C to +150°C.
COMMON
NC = NO CONNECT
Figure 2.High Line Current Sensor
POWER
DEVICE
5V
Automotive platforms demand precision components for better
system control. The AD8203 provides excellent ac and dc
performance that keeps errors to a minimum in the user’s
system. Typical offset and gain drift in the SOIC package are
5 µV/°C and 1 ppm/°C, respectively. The device also delivers a
minimum CMRR of 77 dB from dc to 10 kHz.
OUTPUT
+IN
NC +V
OUT
S
BATTERY
14V
4 TERM
SHUNT
AD8200
AD8203
–IN GND A1
A2
The AD8203 features an externally accessible 100 kΩ resistor
at the output of the preamp A1, which can be used for low-pass
filter applications and for establishing gains other than 20.
CLAMP
DIODE
INDUCTIVE
LOAD
COMMON
NC = NO CONNECT
Rev. PrA
Figure 3. Low Line Current Sensor
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result from its use. Specifications subject to change without notice. No license
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