G = 0.2, Level Translation,
16-Bit ADC Driver
Rev. A
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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
APPLICATIONS
Level translator
ADC driver
Instrumentation amplifier building block
Automated test equipment
PIN CONFIGURATION
07546-001
REF1
1
–IN
2
+IN
3
–V
S
4
REF2
8
+V
S
7
OUT
6
SENSE
5
AD8275
TOP VIEW
(Not to Scale)
Figure 1.
TYPICAL APPLICATION
07546-002
VREF
4.096V
AD8275
7
4
5
6
8
2
50kΩ
0.1µF
50kΩ
20kΩ
20kΩ
33Ω
10kΩ
3
+IN
–IN
VIN
REF2
REF1
–V
S
+V
S
+5V
OUT
SENSE
0.1µF
2.7nF
10µF
1
AD7685
VDD
GNDREF
IN+
IN–
+10V
–10V
+4.048V
+0.048V
+2.048V
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 High Voltage
Single-Supply
Current Sense
AD8270 AD628 AD8202
AD8273 AD629 AD8203
AD8274 AD8205
AD8275 AD8206
AMP03 AD8216
