AD8229_16 Datasheet, PDF (1/25 Pages) Analog Devices – 1 nV/√Hz Low Noise 210°C Instrumentation Amplifier

Data Sheet
1 nV/√Hz Low Noise
210°C Instrumentation Amplifier
AD8229
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
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.
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
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)
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).
Rev. B
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