Datasheet Analog Devices AD8421 — Datenblatt

REVISIONS
LTR DESCRIPTION DATE Prepared in accordance with ASME Y14.24 APPROVED Vendor item drawing REV
PAGE
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OF PAGES REV
PAGE 1 2 PMIC N/A PREPARED BY
RICK OFFICER Original date of drawing
YY-MM-DD CHECKED BY
RAJESH PITHADIA 13-09-18 4 A
REV 5 6 7 8 9 10 11 12 13 14 DLA LAND AND MARITIME
COLUMBUS, OHIO 43218-3990
http://www.landandmaritime.dla.mil/
TITLE
MICROCIRCUIT, LINEAR, LOW POWER
INSTRUMENTATION AMPLIFIER, MONOLITHIC
SILICON APPROVED BY
CHARLES F. SAFFLE
SIZE AMSC N/A 3 CODE IDENT. NO. DWG NO. V62/13625 16236
PAGE 1 OF 14
5962-V075-13 1. SCOPE
1.1 Scope. This drawing documents the general requirements of a high performance low power instrumentation amplifier …

3 nV/√Hz, Low Power
Instrumentation Amplifier
AD8421 Data Sheet Medical instrumentation
Precision data acquisition
Microphone preamplification
Vibration analysis
Multiplexed input applications
ADC driver AD8421 –IN 1 8 +VS RG 2 7 VOUT RG 3 6 REF +IN 4 5 –VS TOP VIEW
(Not to Scale) Figure 1. 10µ G = 100
BEST AVAILABLE
7mA LOW NOISE IN-AMP 1µ 100n 10n BEST AVAILABLE
1mA LOW POWER IN-AMP
AD8421
RS NOISE ONLY 1n
100 1k 10k 100k SOURCE RESISTANCE, RS (Ω) 1M 10123-078 APPLICATIONS PIN CONNECTION DIAGRAM TOTAL NOISE DENSITY AT 1kHz (V/√Hz) Low power
2.3 mA maximum supply current
Low noise
3.2 nV/√Hz maximum input voltage noise at 1 kHz
200 fA/√Hz current noise at 1 kHz
Excellent ac specifications
10 MHz bandwidth (G = 1)
2 MHz bandwidth (G = 100)
0.6 μs settling time to 0.001% (G = 10) …

3 nV/√Hz, Low Power
Instrumentation Amplifier
AD8421-KGD Known Good Die FUNCTIONAL BLOCK DIAGRAM Low power: 2.3 mA maximum quiescent current
Low noise
3.2 nV/√Hz maximum input voltage noise at 1 kHz
200 fA/√Hz typical current noise spectral density at 1 kHz
Excellent ac specifications
10 MHz typical small signal bandwidth (gain = 1 and gain = 10)
2 MHz typical small signal bandwidth (gain = 100)
0.6 µs typical settling time to 0.001% (gain = 10)
80 dB minimum CMRR at 20 kHz (gain = 1)
35 V/µs typical slew rate
High precision dc performance
84 dB minimum CMRR DC to 60 Hz with 1 kΩ source
imbalance (gain = 1)
0.9 µV/°C maximum input offset voltage, average
temperature coefficient
5 ppm/°C maximum gain vs. temperature (gain = 1)
2 nA maximum input bias current
Inputs protected to 40 V from opposite supply
±2.5 V to ±18 V dual supply (+5 V to +36 V single supply)
Gain set with a single resistor (gain = 1 to 10,000)
Known Good Die (KGD): these die are fully guaranteed to …

3 nV/√Hz, Low Power
Instrumentation Amplifier
AD8421-EP Enhanced Product PIN CONNECTION DIAGRAM Supports defense and aerospace applications (AQEC standard)
Military temperature range (−55°C to +125°C)
Controlled manufacturing baseline
One assembly/test site
One fabrication site
Enhanced product change notification
Qualification data available on request GENERAL DESCRIPTION
The AD8421-EP is a low cost, low power, extremely low noise,
ultralow bias current, high speed instrumentation amplifier that
is ideally suited for a broad spectrum of signal conditioning and
data acquisition applications. This product features extremely
high CMRR, allowing it to extract low level signals in the presence
of high frequency common-mode noise over a wide
temperature range.
The 10 MHz bandwidth, 35 V/μs slew rate, and 0.6 μs settling
time to 0.001% (G = 10) allow the AD8421-EP to amplify high
speed signals and excel in applications that require high channel
count, multiplexed systems. Even at higher gains, the current
feedback architecture maintains high performance; for example,
at G = 100, the bandwidth is 2 MHz and the settling time is
0.8 μs. The AD8421-EP has excellent distortion performance, …

3 nV/√Hz, Low Power
Instrumentation Amplifier
AD8421 Data Sheet Medical instrumentation
Precision data acquisition
Microphone preamplification
Vibration analysis
Multiplexed input applications
ADC driver AD8421 –IN 1 8 +VS RG 2 7 VOUT RG 3 6 REF +IN 4 5 –VS TOP VIEW
(Not to Scale) Figure 1. 10µ G = 100
BEST AVAILABLE
7mA LOW NOISE IN-AMP 1µ 100n 10n BEST AVAILABLE
1mA LOW POWER IN-AMP
AD8421
RS NOISE ONLY 1n
100 1k 10k 100k SOURCE RESISTANCE, RS (Ω) 1M 10123-078 APPLICATIONS PIN CONNECTION DIAGRAM TOTAL NOISE DENSITY AT 1kHz (V/√Hz) Low power
2.3 mA maximum supply current
Low noise
3.2 nV/√Hz maximum input voltage noise at 1 kHz
200 fA/√Hz current noise at 1 kHz
Excellent ac specifications
10 MHz bandwidth (G = 1)
2 MHz bandwidth (G = 100)
0.6 μs settling time to 0.001% (G = 10) …