參數(shù)資料
型號(hào)： AD8428BRZ-RL
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 1/20頁(yè)
文件大小： 0K
描述： IC OPAMP INST 3.5MHZ LN 8SOIC
標(biāo)準(zhǔn)包裝： 2,500
放大器類(lèi)型： 儀表
電路數(shù)： 1
轉(zhuǎn)換速率： 50 V/µs
-3db帶寬： 3.5MHz
電流 - 輸入偏壓： 200nA
電壓 - 輸入偏移： 25µV
電流 - 電源： 6.5mA
電流 - 輸出 / 通道： 30mA
電壓 - 電源，單路/雙路(±)： ±4 V ~ 18 V
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： *
封裝/外殼： *
供應(yīng)商設(shè)備封裝： *
包裝： *
Low Noise, Low Gain Drift, G = 2000
Instrumentation Amplifier
Data Sheet
Rev. A
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
2011–2012 Analog Devices, Inc. All rights reserved.
FEATURES
Fixed gain of 2000
Access to internal nodes provides flexibility
Low noise: 1.5 nV/√Hz input voltage noise
High accuracy dc performance
Gain drift: 5 ppm/°C
Offset drift: 0.3 μV/°C
Gain accuracy: 0.05%
CMRR: 140 dB min
Excellent ac specifications
Bandwidth: 3.5 MHz
Slew rate: 40 V/μs
Power supply range: ±4 V to ±18 V
8-lead SOIC package
ESD protection: 5000 V (HBM)
Temperature range for specified performance:
40°C to +85°C
Operational up to 125°C
APPLICATIONS
Sensor interface
Medical instrumentation
Patient monitoring
FUNCTIONAL BLOCK DIAGRAM
+IN
–IN
–FIL
+FIL
+VS
–VS
AD8428
3k
6k
120k
30.15
3k
OUT
REF
09
73
1-
0
01
Figure 1.
Table 1. Instrumentation Amplifiers by Category1
General-
Purpose
Zero
Drift
Military
Grade
Low
Power
Low
Noise
1 See www.analog.com for the latest instrumentation amplifiers.
GENERAL DESCRIPTION
The AD8428 is an ultralow noise instrumentation amplifier
designed to accurately measure tiny, high speed signals. It
delivers industry-leading gain accuracy, noise, and bandwidth.
All gain setting resistors for the AD8428 are internal to the part
and are precisely matched. Care is taken in both the chip pinout
and layout. This results in excellent gain drift and quick settling
to the final gain value after the part is powered on.
The high CMRR of the AD8428 prevents unwanted signals
from corrupting the signal of interest. The pinout of the AD8428
is designed to avoid parasitic capacitance mismatches that can
degrade CMRR at high frequencies.
The AD8428 is one of the fastest instrumentation amplifiers
available. The circuit architecture is designed for high bandwidth
at high gain. The AD8428 uses a current feedback topology for
the initial preamplifier gain stage of 200, followed by a difference
amplifier stage of 10. This architecture results in a 3.5 MHz
bandwidth at a gain of 2000 for an equivalent gain bandwidth
product of 7 GHz.
The AD8428 pinout allows access to internal nodes between the
first and second stages. This feature can be useful for modifying
the frequency response between the two amplification stages,
thereby preventing unwanted signals from contaminating the
output results.
The performance of the AD8428 is specified over the industrial
temperature range of 40°C to +85°C. It is available in an 8-lead
plastic SOIC package.
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