ANALOG DEVICES AD8229-KGD Service Manual
1 nV/√Hz Low Noise 210°C
AD8229-KGD
10107-003
–IN
R
G
R
G
+IN
+V
S
V
OUT
REF
–V
S
AD8229-KGD
100
80
60
40
20
0
–20
–40
–60
–80
–100
V
OSI
(µV)
–55 –35 –15 5 25 45 65 85 105 125 145 165 185 205 225
TEMPERATURE (°C)
09412-016
Known Good Die
FEATURES
Designed 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 dB (1 kHz, G = 1)
Versatile
±4 V to ±17 V dual supply
Gain set with single resistor (G = 1 to 1000)
Temperature range: −40°C to +210°C
Known good die (KGD): these die are fully guaranteed to
data sheet specifications
APPLICATIONS
Down-hole instrumentation
Harsh environment data acquisition
Exhaust gas measurements
Vibration analysis
GENERAL DESCRIPTION
The AD8229-KGD is an ultralow noise instrumentation amplifier
designed for measuring small signals in the presence of large
common-mode voltages and high temperatures.
The AD8229-KGD 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 compensate for the low V
The AD8229-KGD excels at distinguishing tiny signals. It delivers
industry leading 1 nV/√Hz input noise performance. The high
CMRR of the AD8229-KGD prevents unwanted signals from
corrupting the acquisition. The CMRR increases as the gain
increases, offering high rejection when it is most needed.
The AD8229-KGD is one of the fastest instrumentation amplifiers
available. Its current feedback architecture provides bandwidth
that is quite high, even at high gains, for example, 1.2 MHz at
G = 100. With the high bandwidth comes excellent distortion
performance, allowing use in demanding applications such as
vibration analysis.
Rev. 0
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responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
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Trad emarks and registered trademarks are the property of their respective owners.
voltages at high temperatures.
BE
Instrumentation Amplifier
FUNCTIONAL BLOCK DIAGRAM
Figure 1.
Gain is set from 1 to 1000 with a single resistor. A reference pin
allows the user to offset the output voltage. This feature is useful
when interfacing with analog-to-digital converters.
Additional application and technical information can be found
in the AD8229 standard product data sheet.
Figure 2. Typical Input Offset vs. Temperature (G = 100)
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Tel: 781.329.4700
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