AD8421BRMZ-RL datasheet, PDF - EEWORLD Datasheet

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AD8421BRMZ-RL: DescriptionInstrumentation Amplifiers 3nV/Hz Low Power; CategoryAnalog mixed-signal IC Amplifier circuit; File Size631KB，28 Pages; ManufacturerADI; Websitehttps://www.analog.com; Environmental Compliance

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Instrumentation Amplifiers 3nV/Hz Low Power

AD8421BRMZ-RL Parametric

Parameter Name	Attribute value
Source Url Status Check Date	2013-05-01 14:56:26.34
Brand Name	Analog Devices Inc
Is it lead-free?	Contains lead
Is it Rohs certified?	conform to
Maker	ADI
package instruction	TSSOP, TSSOP8,.19
Contacts	8
Manufacturer packaging code	RM-8
Reach Compliance Code	compliant
ECCN code	EAR99
Amplifier type	INSTRUMENTATION AMPLIFIER
Maximum average bias current (IIB)	0.006 µA
Nominal bandwidth (3dB)	10 MHz
Minimum Common Mode Rejection Ratio	93 dB
Maximum input offset current (IIO)	0.0008 µA
Maximum input offset voltage	45 µV
JESD-30 code	S-PDSO-G8
JESD-609 code	e3
length	3 mm
Humidity sensitivity level	1
Negative supply voltage upper limit	-18 V
Nominal Negative Supply Voltage (Vsup)	-15 V
maximum nonlinearity	0.005%
Number of functions	1
Number of terminals	8
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Package body material	PLASTIC/EPOXY
encapsulated code	TSSOP
Encapsulate equivalent code	TSSOP8,.19
Package shape	SQUARE
Package form	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	260
power supply	+-2.5/+-18/5/36 V
Certification status	Not Qualified
Maximum seat height	1.1 mm
Nominal slew rate	35 V/us
Maximum slew rate	2.6 mA
Supply voltage upper limit	18 V
Nominal supply voltage (Vsup)	15 V
surface mount	YES
technology	BIPOLAR
Temperature level	INDUSTRIAL
Terminal surface	Matte Tin (Sn)
Terminal form	GULL WING
Terminal pitch	0.65 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	30
Maximum voltage gain	10000
Minimum voltage gain	1
Nominal voltage gain	10
width	3 mm

User Manual

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Data Sheet

FEATURES

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)

80 dB CMRR at 20 kHz (G = 1)

35 V/μs slew rate

High precision dc performance (AD8421BRZ)

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

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)

3 nV/√Hz, Low Power

Instrumentation Amplifier

AD8421

PIN CONNECTION DIAGRAM

–IN

+IN

AD8421

OUT

REF

–V

10123-001

TOP VIEW

(Not to Scale)

Figure 1.

10µ

TOTAL NOISE DENSITY AT 1kHz (V/√Hz)

G = 100

BEST AVAILABLE

7mA LOW NOISE IN-AMP

1µ

100n

APPLICATIONS

Medical instrumentation

Precision data acquisition

Microphone preamplification

Vibration analysis

Multiplexed input applications

ADC driver

10n

BEST AVAILABLE

1mA LOW POWER IN-AMP

AD8421

NOISE ONLY

10k

100k

10123-078

100

SOURCE RESISTANCE, R

(Ω)

Figure 2. Noise Density vs. Source Resistance

GENERAL DESCRIPTION

The

AD8421

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

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

has excellent distortion performance, making it suitable

for use in demanding applications such as vibration analysis.

The

AD8421

delivers 3 nV/√Hz input voltage noise and

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

AD8421

employs

innovative process technology and design techniques to provide

noise performance that is limited only by the sensor.

The

AD8421

uses unique protection methods to ensure robust

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

AD8421

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

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

and SOIC packages.

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.

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

Tel: 781.329.4700

www.analog.com

Fax: 781.461.3113

AD8421

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications....................................................................................... 1

Pin Connection Diagram ................................................................ 1

General Description ......................................................................... 1

Revision History ............................................................................... 2

Specifications..................................................................................... 3

AR and BR Grades........................................................................ 3

ARM and BRM Grades................................................................ 5

Absolute Maximum Ratings............................................................ 8

Thermal Resistance ...................................................................... 8

ESD Caution.................................................................................. 8

Pin Configuration and Function Descriptions............................. 9

Typical Performance Characteristics ........................................... 10

Theory of Operation ...................................................................... 20

Architecture................................................................................. 20

Data Sheet

Gain Selection............................................................................. 20

Reference Terminal .................................................................... 21

Input Voltage Range................................................................... 21

Layout .......................................................................................... 21

Input Bias Current Return Path ............................................... 22

Input Voltages Beyond the Supply Rails.................................. 22

Radio Frequency Interference (RFI)........................................ 23

Calculating the Noise of the Input Stage................................. 23

Applications Information .............................................................. 25

Differential Output Configuration .......................................... 25

Driving an ADC ......................................................................... 26

Outline Dimensions ....................................................................... 27

Ordering Guide .......................................................................... 27

REVISION HISTORY

5/12—Revision 0: Initial Version

Rev. 0 | Page 2 of 28

AD8421BRMZ-RL Related Products

	AD8421BRMZ-RL	AD8421ARZ	AD8421BRZ-RL	AD8421BRZ	AD8421BRMZ-R7	AD8421BRMZ
Description	Instrumentation Amplifiers 3nV/Hz Low Power	Instrumentation Amplifiers 3nV/Hz Low Power	Instrumentation Amplifiers 3nV/Hz Low Power	Instrumentation Amplifiers 3nV/Hz Low Power	Instrumentation Amplifiers 3nV/Hz Low Power	Instrumentation Amplifiers 3nV/Hz Low Power
Source Url Status Check Date	2013-05-01 14:56:26.34	2013-05-01 14:56:26.336	2013-05-01 14:56:26.343	2013-05-01 14:56:26.341	2013-05-01 14:56:26.339	2013-05-01 14:56:26.339
Brand Name	Analog Devices Inc	Analog Devices Inc	Analog Devices Inc	Analog Devices Inc	Analog Devices Inc	Analog Devices Inc
Is it lead-free?	Contains lead	Contains lead	Contains lead	Contains lead	Contains lead	Contains lead
Is it Rohs certified?	conform to	conform to	conform to	conform to	conform to	conform to
Maker	ADI	ADI	ADI	ADI	ADI	ADI
package instruction	TSSOP, TSSOP8,.19	SOP, SOP8,.25	SOP, SOP8,.25	SOP, SOP8,.25	TSSOP, TSSOP8,.19	TSSOP, TSSOP8,.19
Contacts	8	8	8	8	8	8
Manufacturer packaging code	RM-8	R-8	R-8	R-8	RM-8	RM-8
Reach Compliance Code	compliant	compliant	compliant	compliant	compliant	compliant
ECCN code	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99
Amplifier type	INSTRUMENTATION AMPLIFIER	INSTRUMENTATION AMPLIFIER	INSTRUMENTATION AMPLIFIER	INSTRUMENTATION AMPLIFIER	INSTRUMENTATION AMPLIFIER	INSTRUMENTATION AMPLIFIER
Maximum average bias current (IIB)	0.006 µA	0.008 µA	0.006 µA	0.006 µA	0.006 µA	0.006 µA
Nominal bandwidth (3dB)	10 MHz	10 MHz	10 MHz	10 MHz	10 MHz	10 MHz
Minimum Common Mode Rejection Ratio	93 dB	80 dB	93 dB	93 dB	93 dB	93 dB
Maximum input offset current (IIO)	0.0008 µA	0.0022 µA	0.0008 µA	0.0008 µA	0.0008 µA	0.0008 µA
Maximum input offset voltage	45 µV	86 µV	45 µV	45 µV	45 µV	45 µV
JESD-30 code	S-PDSO-G8	R-PDSO-G8	R-PDSO-G8	R-PDSO-G8	S-PDSO-G8	S-PDSO-G8
JESD-609 code	e3	e3	e3	e3	e3	e3
length	3 mm	4.9 mm	4.9 mm	4.9 mm	3 mm	3 mm
Humidity sensitivity level	1	1	1	1	1	1
Negative supply voltage upper limit	-18 V	-18 V	-18 V	-18 V	-18 V	-18 V
Nominal Negative Supply Voltage (Vsup)	-15 V	-15 V	-15 V	-15 V	-15 V	-15 V
maximum nonlinearity	0.005%	0.005%	0.005%	0.005%	0.005%	0.005%
Number of functions	1	1	1	1	1	1
Number of terminals	8	8	8	8	8	8
Maximum operating temperature	85 °C	85 °C	85 °C	85 °C	85 °C	85 °C
Minimum operating temperature	-40 °C	-40 °C	-40 °C	-40 °C	-40 °C	-40 °C
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	TSSOP	SOP	SOP	SOP	TSSOP	TSSOP
Encapsulate equivalent code	TSSOP8,.19	SOP8,.25	SOP8,.25	SOP8,.25	TSSOP8,.19	TSSOP8,.19
Package shape	SQUARE	RECTANGULAR	RECTANGULAR	RECTANGULAR	SQUARE	SQUARE
Package form	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE	SMALL OUTLINE	SMALL OUTLINE	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	260	260	260	260	260	260
power supply	+-2.5/+-18/5/36 V	+-2.5/+-18/5/36 V	+-2.5/+-18/5/36 V	+-2.5/+-18/5/36 V	+-2.5/+-18/5/36 V	+-2.5/+-18/5/36 V
Certification status	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified
Maximum seat height	1.1 mm	1.75 mm	1.75 mm	1.75 mm	1.1 mm	1.1 mm
Nominal slew rate	35 V/us	35 V/us	35 V/us	35 V/us	35 V/us	35 V/us
Maximum slew rate	2.6 mA	2.6 mA	2.6 mA	2.6 mA	2.6 mA	2.6 mA
Supply voltage upper limit	18 V	18 V	18 V	18 V	18 V	18 V
Nominal supply voltage (Vsup)	15 V	15 V	15 V	15 V	15 V	15 V
surface mount	YES	YES	YES	YES	YES	YES
technology	BIPOLAR	BIPOLAR	BIPOLAR	BIPOLAR	BIPOLAR	BIPOLAR
Temperature level	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL
Terminal surface	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)
Terminal form	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING
Terminal pitch	0.65 mm	1.27 mm	1.27 mm	1.27 mm	0.65 mm	0.65 mm
Terminal location	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL
Maximum time at peak reflow temperature	30	30	30	30	30	30
Maximum voltage gain	10000	10000	10000	10000	10000	10000
Minimum voltage gain	1	1	1	1	1	1
Nominal voltage gain	10	10	10	10	10	10
width	3 mm	3.9 mm	3.9 mm	3.9 mm	3 mm	3 mm

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