AD8229 Datasheet, PDF (1/24 Pages) Analog Devices – 1nV/√Hz Low Noise 210°C Instrumentation Amplifier

1nV/√Hz Low Noise
210°C Instrumentation Amplifier
AD8229
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
APPLICATIONS
Down-hole instrumentation
Harsh environment data acquisition
Exhaust gas measurements
Vibration analysis
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
compensate for the low VBE voltages at high temperatures. To
enhance long term reliability, the wire bonding in the packaging
is designed to avoid intermetallic absorption at high
temperatures.
The AD8229 excels at distinguishing tiny signals. It delivers
industry leading 1 nV/√Hz input noise performance. The
AD8229’s high CMRR prevents unwanted signals from
corrupting the acquisition. The CMRR increases as the gain
increases, offering high rejection when it is most needed.
FUNCTIONAL BLOCK DIAGRAM
–IN 1
R_G 2
R_G 3
+IN 4
AD8229
8 +V_S
7 V_OUT
6 REF
5 –V_S
TOP VIEW
(Not to Scale)
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)
The AD8229 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.
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.
The AD8229 is available in an 8-pin ceramic DIP package.
Rev. 0
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