AD8270 Datasheet, PDF (1/4 Pages) Analog Devices – Precision, Dual-Channel Difference Amplifier

Preliminary Technical Data
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
Precision, Dual-Channel
Difference Amplifier
AD8270
FUNCTIONAL BLOCK DIAGRAM
16 15 14 13
AD8270
10k
10k
10k
–IN1 1
10k
–IN1 2
10k
+IN1 3
10k
+IN1 4
10k
12 –IN2
10k
11 –IN2
10k
10 +IN2
10k
9 +IN2
20k 20k
56
20k 20k
78
Figure 1. AD8270 Dual Difference Amplifier
Table 1. Difference Amplifiers by Category
Low
High
Distortion Voltage
Single Supply
Uni-directional
Single Supply
Bi-directional
AD8270 AD628
AD8202
AD8205
AD8273 AD629
AD8203
AD8206
AMP03
AD8212
AD8210
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).
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.
Rev. PrA
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