Precision Dual-Channel,

Difference Amplifier

AD8270

Rev. 0

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FEATURES

With no external resistors

Difference amplifier: gains of 0.5, 1, or 2

Single ended amplifiers: over 40 different gains

Set reference voltage at midsupply

Excellent ac specifications

15 MHz bandwidth

30 V/μs slew rate

High accuracy dc performance

0.08% maximum gain error

10 ppm/°C maximum gain drift

80 dB minimum CMRR (G = 2)

Two channels in small 4 mm × 4 mm LFCSP

Supply current: 2.5 mA per channel

Supply range: ±2.5 V to ±18 V

APPLICATIONS

Instrumentation amplifier building blocks

Level translators

Automatic test equipment

High performance audio

Sine/Cosine encoders

GENERAL DESCRIPTION

The AD8270 is a low distortion, dual-channel amplifier with

internal gain setting resistors. With no external components,

it can be configured as a high performance difference amplifier

with gains of 0.5, 1, or 2. It can also be configured in over 40 single-

ended configurations, with gains ranging from −2 to +3.

The AD8270 is the first dual-difference amplifier in the small

4 mm × 4 mm LFCSP. It requires the same board area as a typical

single-difference amplifier. The smaller package allows a 2×

increase in channel density and a lower cost per channel, all

with no compromise in performance.

The AD8270 operates on both single and dual supplies and

requires only 2.5 mA maximum supply current for each ampli-

fier. It is specified over the industrial temperature range of

−40°C to +85°C and is fully RoHS compliant.

FUNCTIONAL BLOCK DIAGRAM

1

–IN1A

2

–IN2A

3

+IN2A

4

+IN1A

11 –IN2B

12 –IN1B

10 +IN2B

9+IN1B

AD8270

_

+

10kΩ

10kΩ

10kΩ

10kΩ

10kΩ

10kΩ

10kΩ

10kΩ

10kΩ

10kΩ

20kΩ

20kΩ

20kΩ

20kΩ

_

+

Figure 1.

Table 1. Difference Amplifiers by Category

High

Speed

High

Voltage

Single-Supply

Unidirectional

Single-Supply

Bidirectional

AD8270

AD628

AD8202

AD8205

AD8273

AD629

AD8203

AD8206

AMP03

AD8216