G = 0.2, Level Translation,
16-Bit ADC Driver
AD8275
FEATURES
Translates ±10 V to +4 V
Drives 16-bit SAR ADCs
Small MSOP package
Input overvoltage: +40 V to −35 V (V
S
= 5 V)
Fast settling time: 450 ns to 0.001%
Rail-to-rail output
Wide supply operation: +3.3 V to +15 V
High CMRR: 80 dB
Low gain drift: 1 ppm/°C
Low offset drift: 2.5 μV/°C
+10V
PIN CONFIGURATION
REF1
1
–IN
2
+IN
3
–V
S 4
8
REF2
+V
S
SENSE
07546-001
AD8275
TOP VIEW
(Not to Scale)
7
6
5
OUT
Figure 1.
TYPICAL APPLICATION
+5V
0.1µF
7
0.1µF
+4.048V
+2.048V
+V
S
50kΩ
10kΩ
SENSE
OUT
6
2
5
+0.048V
APPLICATIONS
Level translator
ADC driver
Instrumentation amplifier building block
Automated test equipment
–IN
33Ω
IN+
2.7nF
VDD
AD7685
IN–
REF
GND
–10V
VIN
3
50kΩ
+IN
20kΩ
20kΩ
–V
S
4
REF2
REF1
8
1
VREF
4.096V
10µF
07546-002
AD8275
Figure 2. Translating ±10 V to 4.096 V ADC Full Scale
GENERAL DESCRIPTION
The AD8275 is a G = 0.2 difference amplifier that can be used
to translate ±10 V signals to a +4 V level. It solves the problem
typically encountered in industrial and instrumentation applic-
ations where ±10 V signals must be interfaced to a single-supply
4 V or 5 V ADC. The AD8275 interfaces the two signal levels,
simplifying design.
The AD8275 has fast settling time of 450 ns and low distortion,
making it suitable for driving medium speed successive approx-
imation (SAR) ADCs. Its wide input voltage range and rail-to-
rail outputs make it an easy to use building block. Single-supply
operation reduces the power consumption of the amplifier and
helps to protect the ADC from overdrive conditions.
Internal, matched, precision laser-trimmed resistors ensure
low gain error, low gain drift of 1 ppm/°C (maximum), and
high common-mode rejection of 80 dB. Low offset and low
offset drift, combined with its fast settling time, make the
AD8275 suitable for a variety of data acquisition applications
where accurate and quick capture is required.
The AD8275 can be used as an analog front end, or it can follow
buffers to level translate high voltages to a voltage range accepted
by the ADC. In addition, the AD8275 can be configured for diff-
erential outputs if used with a differential ADC.
The AD8275 is available in a space-saving, 8-lead MSOP
and is specified for performance over the −40°C to +85°C
temperature range.
Table 1. Difference Amplifiers by Category
Low Distortion
AD8275
High Voltage
Single-Supply
Current Sense
Rev. A
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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
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