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3 nV/√Hz, Low Power
Instrumentation Amplifier
Data Sheet
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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
2012 Analog Devices, Inc. All rights reserved.
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)
APPLICATIONS
Medical instrumentation
Precision data acquisition
Microphone preamplification
Vibration analysis
Multiplexed input applications
ADC driver
PIN CONNECTION DIAGRAM
TOP VIEW
(Not to Scale)
–IN
1
RG 2
RG 3
+IN
4
+VS
8
VOUT
7
REF
6
–VS
5
AD8421
10
123-
00
1
Figure 1.
10
1n
100
1M
TOTA
L
N
O
IS
E
D
E
N
S
ITY
A
T
1
kH
z(
V
/√
Hz)
SOURCE RESISTANCE, RS ()
101
23-
078
1
100n
10n
1k
10k
100k
G = 100
AD8421
BEST AVAILABLE
1mA LOW POWER IN-AMP
BEST AVAILABLE
7mA LOW NOISE IN-AMP
RS NOISE ONLY
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.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AD8421BRMZ_PROMO | 制造商:Analog Devices 功能描述:IC INST AMP 35VIN 10MHZ M |
| AD8421BRMZ-R7 | 功能描述:IC OPAMP INST 10MHZ LP LN 8MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:1 系列:- 放大器類型:通用 電路數(shù):2 輸出類型:滿擺幅 轉換速率:2.1 V/µs 增益帶寬積:3MHz -3db帶寬:- 電流 - 輸入偏壓:1pA 電壓 - 輸入偏移:2000µV 電流 - 電源:750µA 電流 - 輸出 / 通道:16mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 16 V，±1.35 V ~ 8 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:14-SOIC 包裝:剪切帶 (CT) 其它名稱:296-10529-1 |
| AD8421BRMZ-RL | 功能描述:IC OPAMP INST 10MHZ LP LN 8MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:1 系列:- 放大器類型:通用 電路數(shù):2 輸出類型:滿擺幅 轉換速率:2.1 V/µs 增益帶寬積:3MHz -3db帶寬:- 電流 - 輸入偏壓:1pA 電壓 - 輸入偏移:2000µV 電流 - 電源:750µA 電流 - 輸出 / 通道:16mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 16 V，±1.35 V ~ 8 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:14-SOIC 包裝:剪切帶 (CT) 其它名稱:296-10529-1 |
| AD8421BRZ | 功能描述:IC OP AMP INSTRUMENTATION 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:1 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉換速率:0.028 V/µs 增益帶寬積:105kHz -3db帶寬:- 電流 - 輸入偏壓:3nA 電壓 - 輸入偏移:100µV 電流 - 電源:3.3µA 電流 - 輸出 / 通道:12mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 12 V，±1.35 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:14-TSSOP 包裝:剪切帶 (CT) 其它名稱:OP481GRUZ-REELCT |
| AD8421BRZ_PROMO | 制造商:Analog Devices 功能描述:IC INST AMP 35VIN 10MHZ S |
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