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| 型號： | AD8400AR50-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 1/32頁 |
| 文件大小： | 0K |
| 描述： | IC POT DIG SGLE 50K 8BIT 8SOIC |
| 產(chǎn)品變化通告： | Product Discontinuance 27/Oct/2011 |
| 標準包裝： | 2,500 |
| 接片： | 256 |
| 電阻（歐姆）： | 50k |
| 電路數(shù)： | 1 |
| 溫度系數(shù)： | 標準值 500 ppm/°C |
| 存儲器類型： | 易失 |
| 接口： | 3 線 SPI（芯片選擇） |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SO |
| 包裝： | 帶卷 (TR) |
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1-/2-/4-Channel
Digital Potentiometers
AD8400/AD8402/AD8403
Rev. E
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother
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
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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