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AD8235

更新时间： 2024-11-18 06:36:11
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亚德诺 - ADI 仪表放大器
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20页 508K
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40 μA Micropower Instrumentation Amplifier in WLCSP Package

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AD8235 数据手册

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40 μA Micropower Instrumentation  
Amplifier in WLCSP Package  
AD8235  
FEATURES  
CONNECTION DIAGRAM  
RG  
Low power  
+VS  
A1  
–VS  
D1  
RG  
RG  
B3  
C3  
40 μA maximum supply current  
6 nA shutdown current  
Low input currents  
ESD  
PROTECTION  
ESD  
PROTECTION  
SDN  
A2  
B1  
50 pA input bias current  
25 pA input offset current  
High Common Mode Rejection Ratio (CMRR)  
110 dB CMRR , G = 100  
Space saving  
ESD  
PROTECTION  
C1  
REF  
210kΩ  
52.5kΩ  
52.5kΩ  
210kΩ  
OP AMP  
A
ESD  
PROTECTION  
VOUT  
OP AMP  
B
B2  
D2  
NC  
NC  
WLCSP package  
ESD  
ESD  
PROTECTION  
PROTECTION  
Zero input crossover distortion  
Versatile  
AD8235  
A3  
D3  
Rail-to-rail input and output  
Shutdown  
+IN  
–IN  
Figure 1.  
Gain set with single resistor (G = 5 to 200)  
AD8236: ꢀSOIC package version of AD8235  
PIN CONFIGURATION  
BALL A1  
INDICATOR  
APPLICATIONS  
1
2
3
Medical instrumentation  
Low-side current sense  
Portable electronics  
+V  
–IN  
SDN  
S
A
B
V
OUT  
RG  
RG  
+IN  
NC  
NC  
GENERAL DESCRIPTION  
REF  
The AD8235 is the smallest and lowest power instrumentation  
amplifier in the industry. It is available in a 1.5 mm × 2.2 mm  
wafer level chip scale package (WLCSP). The AD8235 draws  
a maximum quiescent current of 40 μA. In addition, it draws a  
maximum 500 nA of current during shutdown mode, making  
it an excellent instrumentation amplifier for battery powered,  
portable applications.  
C
D
–V  
S
TOP VIEW  
(BALL SIDE DOWN)  
Not to Scale  
NC = NO CONNECT  
Figure 2. 11-Ball WLCSP (CB-11-1)  
The AD8235 can operate on supply voltages as low as 1.8 V. The  
input stage allows for wide rail-to-rail input voltage range without  
the crossover distortion, common in other designs. The rail-to-  
rail output enables easy interfacing to ADCs.  
5.0  
4.5  
4.0  
3.5  
3.0  
2.5  
2.0  
1.5  
1.0  
0.5  
0
G = 5  
V
V
= 5V  
S
= 2.5V  
REF  
The AD8235 is an excellent choice for signal conditioning. Its  
low input bias current of 50 pA and high CMRR of 110 dB  
(G = 100) offer tremendous value for its size and low power.  
It is specified over the extended industrial temperature range of  
−40°C to 125°C.  
G = 5  
V
V
= 1.8V  
S
= 0.9V  
REF  
–0.5  
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5  
OUTPUT VOLTAGE (V)  
Figure 3. Wide Common-Mode Voltage Range vs. Output Voltage  
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 registeredtrademarks arethe property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Fax: 781.461.3113  
www.analog.com  
©2009 Analog Devices, Inc. All rights reserved.  
 
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