Low Noise, Precision

Instrumentation Amplifier

Data Sheet

AMP01

Rev. E

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FEATURES

Low offset voltage: 50 μV maximum

Very low offset voltage drift: 0.3 μV/°C maximum

Low noise: 0.12 μV p-p (0.1 Hz to 10 Hz)

Excellent output drive: ±10 V at ±50 mA

Capacitive load stability: up to 1 μF

Gain range: 0.1 to 10,000

Excellent linearity: 16-bit at G = 1000

High CMR: 125 dB minimum (G = 1000)

Low bias current: 4 nA maximum

Can be configured as a precision op amp

Output-stage thermal shutdown

Available in die form

GENERAL DESCRIPTION

The AMP011 is a monolithic instrumentation amplifier

designed for high-precision data acquisition and instrumen-

tation applications. The design combines the conventional

features of an instrumentation amplifier with a high current

output stage. The output remains stable with high capacitance

loads (1 μF), a unique ability for an instrumentation amplifier.

Consequently, the AMP01 can amplify low level signals for

transmission through long cables without requiring an output

buffer. The output stage can be configured as a voltage or

current generator.

Input offset voltage is very low (20 μV), which generally

eliminates the external null potentiometer. Temperature changes

Excellent low frequency noise performance is achieved with a

minimal compromise on input protection. The bias current is

very low, less than 10 nA over the military temperature range.

High common-mode rejection of 130 dB, 16-bit linearity at a

gain of 1000, and 50 mA peak output current are achievable

simultaneously. This combination takes the instrumentation

amplifier one step further towards the ideal amplifier.

AC performance complements the superb dc specifications. The

AMP01 slews at 4.5 V/μs into capacitive loads of up to 15 nF, settles

in 50 μs to 0.01% at a gain of 1000, and boasts a healthy 26 MHz

gain bandwidth product. These features make the AMP01 ideal

for high speed data acquisition systems.

The gain is set by the ratio of two external resistors over a range of

0.1 to 10,000. A very low gain temperature coefficient of 10 ppm/°C

is achievable over the whole gain range. Output voltage swing is

guaranteed with three load resistances: 50 Ω, 500 Ω, and 2 kΩ.

Loaded with 500 Ω, the output delivers ±13.0 V minimum. A

thermal shutdown circuit prevents destruction of the output

transistors during overload conditions.

The AMP01 can also be configured as a high performance

operational amplifier. In many applications, the AMP01 can be

used in place of op amp/power buffer combinations.

FUNCTIONAL BLOCK DIAGRAM

NULL

NULL

R1

47.5kΩ

R2

2.5kΩ

R4

2.5kΩ

R3

47.5kΩ

A1

A3

A2

Q1

Q2

250Ω

250Ω

–IN

+IN

REFERENCE

V+

OUTPUT

SENSE

V–

Figure 1.