1 nV/√Hz Low Noise

210°C Instrumentation Amplifier

Data Sheet

AD8229

Rev. B

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FEATURES

Designed and guaranteed for 210°C operation

Low noise

1 nV/√Hz input noise

45 nV/√Hz output noise

High CMRR

126 dB CMRR (minimum), G = 100

80 dB CMRR (minimum) to 5 kHz, G = 1

Excellent ac specifications

15 MHz bandwidth (G = 1)

1.2 MHz bandwidth (G = 100)

22 V/μs slew rate

THD: −130 dBc (1 kHz, G = 1)

Versatile

±4 V to ±17 V dual supply

Gain set with single resistor (G = 1 to 1000)

Specified temperature range

−40°C to +210°C, SBDIP package

−40°C to +175°C, SOIC package

APPLICATIONS

Down-hole instrumentation

Harsh environment data acquisition

Exhaust gas measurements

Vibration analysis

FUNCTIONAL BLOCK DIAGRAM

TOP VIEW

(Not to Scale)

–IN

1

2

3

+IN

4

8

7

REF

6

5

AD8229

Figure 1.

100

80

60

40

20

0

–20

–40

–60

–80

–100

–55 –35 –15

5

25

45

65

85 105 125 145 165 185 205 225

TEMPERATURE (°C)

Figure 2. Typical Input Offset vs. Temperature (G = 100)

GENERAL DESCRIPTION

The AD8229 is an ultralow noise instrumentation amplifier

designed for measuring small signals in the presence of large

common-mode voltages and high temperatures.

The AD8229 has been designed for high temperature operation.

The process is dielectrically isolated to avoid leakage currents at

high temperatures. The design architecture was chosen to

The AD8229 excels at measuring tiny signals. It delivers industry

leading 1 nV/√Hz input noise performance. The high CMRR of

the AD8229 prevents unwanted signals from corrupting the

acquisition. The CMRR increases as the gain increases, offering

high rejection when it is most needed.

The AD8229 is one of the fastest instrumentation amplifiers

available. Its current feedback architecture provides high

bandwidth at high gain, for example, 1.2 MHz at G = 100. The

design includes circuitry to improve settling time after large

input voltage transients. The AD8229 was designed for excellent

distortion performance, allowing use in demanding applications

such as vibration analysis.

Gain is set from 1 to 1000 with a single resistor. A reference pin

allows the user to offset the output voltage. This feature can be

useful when interfacing with analog-to-digital converters.

For the most demanding applications, the AD8229 is available

in an 8-lead side-brazed ceramic dual in-line package (SBDIP).

For space-constrained applications, the AD8229 is available in

an 8-lead plastic standard small outline package (SOIC).