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AD8402ARU1

更新时间： 2024-11-07 12:29:07
品牌 Logo 应用领域
亚德诺 - ADI 转换器电位器电阻器光电二极管
页数 文件大小 规格书
32页 610K
描述
1-/2-/4-Channel Digital Potentiometers

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中文翻译

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AD8402ARU1 数据手册

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1-/2-/4-Channel  
Digital Potentiometers  
AD8400/AD8402/AD8403  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
256-position variable resistance device  
Replaces 1, 2, or 4 potentiometers  
1 kΩ, 10 kΩ, 50 kΩ, 100 kΩ  
RDAC1  
A1  
W1  
B1  
AGND1  
8
8
8
8
AD8403  
8-BIT  
V
LATCH  
DD  
DAC  
CK RS  
SELECT  
DGND  
SHDN  
Power shutdown—less than 5 μA  
3-wire,SPI-compatible serial data input  
10 MHz update data loading rate  
2.7 V to 5.5 V single-supply operation  
Qualified for automotive applications  
1
2
RDAC2  
A2  
W2  
B2  
8-BIT  
LATCH  
3
4
A1, A0  
2
CK RS  
SHDN  
AGND2  
10-BIT  
SERIAL  
LATCH  
RDAC3  
A3  
8
8-BIT  
LATCH  
W3  
B3  
AGND3  
SDI  
APPLICATIONS  
D
CK RS  
SHDN  
CK Q RS  
Mechanical potentiometer replacement  
Programmable filters, delays, time constants  
Volume control, panning  
Line impedance matching  
Power supply adjustment  
CLK  
CS  
RDAC4  
A4  
W4  
B4  
AGND4  
8-BIT  
LATCH  
CK RS  
SHDN  
SHDN  
SDO  
RS  
Figure 1.  
GENERAL DESCRIPTION  
The AD8400/AD8402/AD8403 provide a single-, dual-, or  
quad-channel, 256-position, digitally controlled variable resistor  
(VR) device.1 These devices perform the same electronic adjust-  
ment function as a mechanical potentiometer or variable  
resistor. The AD8400 contains a single variable resistor in the  
compact SOIC-8 package. The AD8402 contains two independent  
variable resistors in space-saving SOIC-14 surface-mount  
packages. The AD8403 contains four independent variable  
resistors in 24-lead PDIP, SOIC, and TSSOP packages. Each  
part contains a fixed resistor with a wiper contact that taps the  
fixed resistor value at a point determined by the digital code  
loaded into the controlling serial input register. The resistance  
between the wiper and either endpoint of the fixed resistor  
varies linearly with respect to the digital code transferred into  
the VR latch. Each variable resistor offers a completely  
programmable value of resistance between the A terminal and  
the wiper or the B terminal and the wiper. The fixed A-to-B  
terminal resistance of 1 kΩ, 10 kΩ, 50 kΩ, or 100 kΩ has a 1%  
channel-to-channel matching tolerance with a nominal  
temperature coefficient of 500 ppm/°C. A unique switching  
circuit minimizes the high glitch inherent in traditional  
switched resistor designs, avoiding any make-before-break  
or break-before-make operation.  
100  
R
R
WB  
WA  
75  
50  
25  
0
0
64  
128  
CODE (Decimal)  
192  
255  
Figure 2. RWA and RWB vs. Code  
(continued on Page 3)  
1 The terms digital potentiometer, VR, and RDAC are used interchangeably.  
Rev. E  
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  
© 2010 Analog Devices, Inc. All rights reserved.  
 
 
 
 
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AD8402ARU1 替代型号

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