参数资料
型号: AD8402AR10-REEL
厂商: Analog Devices Inc
文件页数: 1/32页
文件大小: 0K
描述: IC DGTL POT DUAL 10K 8BIT 14SOIC
产品变化通告: Product Discontinuance 27/Oct/2011
标准包装: 2,500
接片: 256
电阻(欧姆): 10k
电路数: 2
温度系数: 标准值 500 ppm/°C
存储器类型: 易失
接口: 3 线 SPI(芯片选择)
电源电压: 2.7 V ~ 5.5 V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 14-SOIC(0.154",3.90mm 宽)
供应商设备封装: 14-SOICN
包装: 带卷 (TR)
1-/2-/4-Channel
Digital Potentiometers
AD8400/AD8402/AD8403
Rev. E
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rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
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Tel: 781.329.4700
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Fax: 781.461.3113
2010 Analog Devices, Inc. All rights reserved.
FEATURES
256-position variable resistance device
Replaces 1, 2, or 4 potentiometers
1 k
, 10 k, 50 k, 100 k
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
APPLICATIONS
Mechanical potentiometer replacement
Programmable filters, delays, time constants
Volume control, panning
Line impedance matching
Power supply adjustment
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.
(continued on Page 3)
1 The terms digital potentiometer, VR, and RDAC are used interchangeably.
FUNCTIONAL BLOCK DIAGRAM
8
8-BIT
LATCH
CK RS
8
8-BIT
LATCH
CK RS
8
8-BIT
LATCH
CK RS
8
8-BIT
LATCH
CK RS
DAC
SELECT
A1, A0
1
10-BIT
SERIAL
LATCH
CK
RS
Q
D
SDO
SHDN
RS
AD8403
VDD
DGND
SDI
CLK
CS
8
2
3
2
4
RDAC1
W1
A1
B1
AGND1
RDAC2
W2
A2
B2
AGND2
RDAC3
W3
A3
B3
AGND3
RDAC4
W4
A4
B4
AGND4
SHDN
0
10
92
-00
1
Figure 1.
CODE (Decimal)
100
75
50
25
0
64
128
192
255
R
WA
(D
),
R
WB
(D
)(
%
o
fN
o
m
in
a
lR
AB
)
RWA
RWB
01
09
2-
0
02
Figure 2. RWA and RWB vs. Code
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