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Analog Devices Semiconductor Electronic Components Datasheet

AD8400 Datasheet

1-/2-/4-Channel Digital Potentiometers

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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.
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
1-/2-/4-Channel
Digital Potentiometers
AD8400/AD8402/AD8403
FUNCTIONAL BLOCK DIAGRAM
VDD
DGND
SDI
CLK
CS
AD8403
DAC
SELECT
1
2
3
A1, A0 4
2
10-BIT
SERIAL 8
LATCH
D
CK Q RS
8-BIT 8 RDAC1
LATCH
CK RS
SHDN
RDAC2
8-BIT 8
LATCH
CK RS
SHDN
RDAC3
8-BIT 8
LATCH
CK RS
SHDN
RDAC4
8-BIT 8
LATCH
CK RS
SHDN
A1
W1
B1
AGND1
A2
W2
B2
AGND2
A3
W3
B3
AGND3
A4
W4
B4
AGND4
SDO
RS SHDN
Figure 1.
100
RWA
75
RWB
50
25
0
0 64 128 192 255
CODE (Decimal)
Figure 2. RWA and RWB vs. Code
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.


Analog Devices Semiconductor Electronic Components Datasheet

AD8400 Datasheet

1-/2-/4-Channel Digital Potentiometers

No Preview Available !

AD8400/AD8402/AD8403
TABLE OF CONTENTS
Features .............................................................................................. 1 
Applications....................................................................................... 1 
General Description ......................................................................... 1 
Functional Block Diagram .............................................................. 1 
Revision History ............................................................................... 2 
Specifications..................................................................................... 4 
Electrical Characteristics—10 kΩ Version................................ 4 
Electrical Characteristics—50 kΩ and 100 kΩ Versions......... 6 
Electrical Characteristics—1 kΩ Version.................................. 8 
Electrical Characteristics—All Versions ................................. 10 
Timing Diagrams........................................................................ 10 
Absolute Maximum Ratings.......................................................... 11 
Serial Data-Word Format .......................................................... 11 
REVISION HISTORY
7/10—Rev. D to Rev. E
Changes to Features Section ............................................................1
Changes to IAB Continuous Current Parameter (Table 5) .........11
Updated Outline Dimensions........................................................26
Changes to Ordering Guide...........................................................30
Added Automotive Products Section ...........................................31
10/05—Rev. C to Rev. D
Updated Format.................................................................. Universal
Changes to Features...........................................................................1
Changes to Table 1.............................................................................4
Changes to Table 2.............................................................................6
Changes to Table 3.............................................................................8
Changes to Table 5...........................................................................11
Added Figure 36...............................................................................18
Replaced Figure 37 ..........................................................................19
Changes to Theory of Operation Section.....................................20
Changes to Applications Section ...................................................24
Updated Outline Dimensions ........................................................26
Changes to Ordering Guide ...........................................................28
ESD Caution................................................................................ 11 
Pin Configurations and Function Descriptions ......................... 12 
Typical Performance Characteristics ........................................... 14 
Test Circuits..................................................................................... 19 
Theory of Operation ...................................................................... 20 
Programming the Variable Resistor......................................... 20 
Programming the Potentiometer Divider............................... 21 
Digital Interfacing ...................................................................... 21 
Applications..................................................................................... 24 
Active Filter ................................................................................. 24 
Outline Dimensions ....................................................................... 26 
Ordering Guide .......................................................................... 30 
Automotive Products ................................................................. 31 
11/01—Rev. B to Rev. C
Addition of new Figure.....................................................................1
Edits to Specifications .......................................................................2
Edits to Absolute Maximum Ratings ..............................................6
Edits to TPCs 1, 8, 12, 16, 20, 24, 35 ...............................................9
Edits to
the Programming the Variable Resistor Section..........................13
Rev. E | Page 2 of 32


Part Number AD8400
Description 1-/2-/4-Channel Digital Potentiometers
Maker Analog Devices
Total Page 30 Pages
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