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AD8244BRMZ-R7 参数 Datasheet PDF下载

AD8244BRMZ-R7图片预览
型号: AD8244BRMZ-R7
PDF下载: 下载PDF文件 查看货源
内容描述: 单电源,低功耗,高精度FET输入器Quad Buffer [Single-Supply, Low Power, Precision FET Input Quad Buffer]
分类和应用:
文件页数/大小: 20 页 / 448 K
品牌: AD [ ANALOG DEVICES ]
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Data Sheet
FEATURES
Low power
250 µA maximum supply current per amplifier
FET input
2 pA maximum input bias current at 25°C
Extremely high input impedance
Low noise
13 nV/√Hz voltage noise at 1 kHz
0.4 µV p-p voltage noise (0.1 Hz to 10 Hz)
0.8 fA/√Hz current noise at 1 kHz
High dc precision
3 µV/°C maximum offset drift (B grade)
3 MHz bandwidth
Unique pinout
No leakage from inputs to supply pins
Provides guarding capability
Rail-to-rail output
Single-supply operation
Input range extends to ground
Wide supply range
Single-supply: 3 V to 36 V
Dual-supply: ±1.5 V to ±18 V
Available in a compact 10-lead MSOP
Single-Supply, Low Power,
Precision FET Input Quad Buffer
PIN CONFIGURATION
AD8244
IN A
1
OUT A
2
+V
S 3
OUT B
4
IN B
5
10
9
8
7
6
IN D
OUT D
–V
S
IN C
11689-001
OUT C
Figure 1.
10
TYPICAL MISMATCH
BETWEEN ANY
TWO CHANNELS
1
IN-AMP
GAIN MATCHING (%)
1/2
0.1
AD8244
0.01
Biopotential electrodes
Medical instrumentation
High impedance sensor conditioning
Filters
Photodiode amplifiers
100
1k
FREQUENCY (Hz)
10k
100k
Figure 2. Gain Matching vs. Frequency
GENERAL DESCRIPTION
The
is a precision, low power, FET input, quad unity-gain
buffer that is designed to isolate very large source impedances
from the rest of the signal chain. The 2 pA maximum bias
current, near zero current noise, and 10 TΩ input impedance
introduce almost no error, even with source impedance well
into the megaohms.
Many traditional operational amplifier pinouts have a supply
pin that is next to the noninverting input. A guard trace must be
routed between these pins to avoid leakage currents much larger
than the bias current of a FET input op amp. Guard traces can
be routed between pins for large packages, such as DIP or even
SOIC; however, the board area consumed by these packages is
prohibitive for many modern applications. The
solves
this problem with a unique pinout that physically separates the
Rev. 0
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
©2013 Analog Devices, Inc. All rights reserved.
high impedance inputs from the low impedance supplies and
outputs of the other buffers. This configuration simplifies
guarding while reducing board space, allowing high performance
and high density in the same design.
The
design is focused on solving problems specific to
buffers. This includes close channel-to-channel matching which
allows channels of the
to be used in differential signal
chains with minimal error. With its low voltage noise, wide
supply range, and high precision, the
is also flexible
enough to provide high performance anywhere a unity-gain
buffer is needed, even with low source resistance.
The
is specified over the industrial temperature range
of −40°C to +85°C. It is available in a 10-lead MSOP package.
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.
11689-002
APPLICATIONS
0.001
10