AD8421 AD [Analog Devices], AD8421 Datasheet

AD8421

Manufacturer Part Number

AD8421

Description

3 nV/?Hz, Low Power

Manufacturer

AD [Analog Devices]

Datasheet

1.AD8421.pdf (28 pages)

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Download datasheet (673Kb)

Data Sheet

FEATURES

Low power

Low noise

Excellent ac specifications

High precision dc performance (AD8421BRZ)

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 (G = 1 to 10,000)

APPLICATIONS

Medical instrumentation

Precision data acquisition

Microphone preamplification

Vibration analysis

Multiplexed input applications

ADC driver

GENERAL DESCRIPTION

The

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

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

for use in demanding applications such as vibration analysis.

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

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

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

2.3 mA maximum supply current

3.2 nV/√Hz maximum input voltage noise at 1 kHz

200 fA/√Hz current noise at 1 kHz

10 MHz bandwidth (G = 1)

2 MHz bandwidth (G = 100)

0.6 μs settling time to 0.001% (G = 10)

80 dB CMRR at 20 kHz (G = 1)

35 V/μs slew rate

94 dB CMRR minimum (G = 1)

0.2 μV/°C maximum input offset voltage drift

1 ppm/°C maximum gain drift (G = 1)

500 pA maximum input bias current

AD8421

has excellent distortion performance, making it suitable

is a low cost, low power, extremely low noise, ultralow

AD8421

to amplify high speed

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

The

200 fA/√Hz current noise with only 2 mA quiescent current,

making it an ideal choice for measuring low level signals. For

applications with high source impedance, the

innovative process technology and design techniques to provide

noise performance that is limited only by the sensor.

The

inputs while still maintaining very low noise. This protection

allows input voltages up to 40 V from the opposite supply rail

without damage to the part.

A single resistor sets the gain from 1 to 10,000. The reference

pin can be used to apply a precise offset to the output voltage.

The

performance curves to 125°C. It is available in 8-lead MSOP

and SOIC packages.

AD8421

100n

10µ

10n

1µ

Instrumentation Amplifier

100

BEST AVAILABLE

1mA LOW POWER IN-AMP

G = 100

AD8421

delivers 3 nV/√Hz input voltage noise and

uses unique protection methods to ensure robust

is specified from −40°C to +85°C and has typical

Figure 2. Noise Density vs. Source Resistance

PIN CONNECTION DIAGRAM

–IN

+IN

3 nV/√Hz, Low Power

SOURCE RESISTANCE, R

(Not to Scale)

AD8421

TOP VIEW

Figure 1.

NOISE ONLY

10k

BEST AVAILABLE

7mA LOW NOISE IN-AMP

REF

–V

OUT

(Ω)

100k

AD8421

www.analog.com

employs

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