Precision, Dual-Channel

Difference Amplifier

Preliminary Technical Data

AD8270

Rev. PrA

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FEATURES

With no external resistors:

Difference Amplifier: Gains: 0.5, 1, 2

Inverting Amplifier: Gains: 0.5, 1, 2

Noninverting Amplifier: Gains: 1.5, 2, 3

Set reference voltage at 0, +Vs/2, or +Vs

Excellent AC Specifications

10 MHz bandwidth

30V/μs slew rate

Low Distortion

-90 dBc @ 100 kHz, 20Vpp, 600

Ω load

High Accuracy DC Performance

0.05% gain accuracy

10 ppm gain drift

400 uV offset voltage

80 dB CMRR

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 Block

Level Translator

Automatic Test Equipment

High Performance Audio

Sin/Cos 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

(G=0.5, 1, or 2), inverting amplifier (G=0.5, 1, or 2) or non-

inverting amplifier (G=1.5, 2, or 3).

FUNCTIONAL BLOCK DIAGRAM

AD8270

1

2

3

4

12

11

10

9

56

7

8

13

14

15

16

–IN1

–IN1

+IN1

+IN1

–IN2

–IN2

+IN2

+IN2

10k

10k

10k

10k

10k

10k

10k

10k

10k

10k

20k

20k

20k

20k

Figure 1. AD8270 Dual Difference Amplifier

Table 1. Difference Amplifiers by Category

Low

Distortion

High

Voltage

Single Supply

Uni-directional

Single Supply

Bi-directional

AD8270

AD8273

AMP03

AD628

AD629

AD8212

AD8202

AD8203

AD8205

AD8206

AD8210

The AD8270 is the first dual difference amplifier in the small 4

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

single difference amplifier. The smaller package allows a 2X

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 only

requires 2.5 mA maximum supply current for both amplifiers. It

is specified over the industrial temperature range of −40°C to

+85°C and is fully RoHS compliant.