+30 V/15 V Operation
128-Position Digital Potentiometer
AD7376
FEATURES FUNCTIONAL BLOCK DIAGRAM
128 positions
AD7376 V
DD
10 k, 50 k, 100 k
SDO Q
A
20 V to 30 V single-supply operation
7-BIT 7 7
7-BIT
10 V to 15 V dual-supply operation
SERIAL
LATCH
REGISTER
3-wire SPI-compatible serial interface
W
THD 0.006% typical
SDI D
Programmable preset
CK
B
SHDN
Power shutdown: less than 1 A
R
iCMOS process technology CLK
CS
V
SS
APPLICATIONS
High voltage DAC
GND RS SHDN
Programmable power supply
Figure 1.
Programmable gain and offset adjustment
Programmable filters, delays
Actuator control
Audio volume control
Mechanical potentiometer replacement
GENERAL DESCRIPTION
1
The AD7376 is one of the few high voltage, high performance The AD7376 features sleep-mode programmability in shutdown
2
digital potentiometers on the market. This device can be used that can be used to program the preset before device activation,
as a programmable resistor or resistor divider. The AD7376 thus providing an alternative to costly EEPROM solutions.
performs the same electronic adjustment function as mechanical
The AD7376 is available in 14-lead TSSOP and 16-lead wide
potentiometers, variable resistors, and trimmers with enhanced
body SOIC packages in 10 k, 50 k, and 100 k options. All
resolution, solid-state reliability, and programmability. With
parts are guaranteed to operate over the 40C to +85C
digital rather than manual control, the AD7376 provides layout
extended industrial temperature range.
flexibility and allows closed-loop dynamic controllability.
1
Patent number: 54952455.
2
The terms digital potentiometer and RDAC are used interchangeably.
Rev. D
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
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rights of third parties that may result from its use. Specifications subject to change without notice. No
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Trademarks and registered trademarks are the property of their respective owners. Fax: 781.461.3113 19972011 Analog Devices, Inc. All rights reserved.
01119-001AD7376
TABLE OF CONTENTS
Features .............................................................................................. 1 Programming the Variable Resistor ......................................... 12
Applications ....................................................................................... 1 Programming the Potentiometer Divider ............................... 13
Functional Block Diagram .............................................................. 1 3-Wire Serial Bus Digital Interface .......................................... 13
General Description ......................................................................... 1 Daisy-Chain Operation ............................................................. 14
Revision History ............................................................................... 2 ESD Protection ........................................................................... 14
Specifications ..................................................................................... 3 Terminal Voltage Operating Range ......................................... 14
Electrical Characteristics10 k Version ................................ 3 Power-Up and Power-Down Sequences .................................. 14
Electrical Characteristics50 k, 100 k Versions ............... 4 Layout and Power Supply Biasing ............................................ 15
Timing Specifications .................................................................. 5 Applications Information .............................................................. 16
3-Wire Digital Interface ................................................................... 6 High Voltage DAC ...................................................................... 16
Absolute Maximum Ratings ............................................................ 7 Programmable Power Supply ................................................... 16
ESD Caution .................................................................................. 7 Audio Volume Control .............................................................. 17
Pin Configurations and Function Descriptions ........................... 8 Outline Dimensions ....................................................................... 18
Typical Performance Characteristics ............................................. 9 Ordering Guide .......................................................................... 19
Theory of Operation ...................................................................... 12
11/05Rev. 0 to Rev. A
REVISION HISTORY
Updated Format .................................................................. Universal
8/11Rev. C to Rev. D
Deleted DIP Package .......................................................... Universal
Changes to Output Logic Low Conditions, Table 1 ..................... 3
Changes to Features ..........................................................................1
Changes to Output Logic Low Conditions, Table 2 ..................... 5
Separated Electrical Characteristics into Table 1 and Table 2 .....3
Changes to Figure 28 ...................................................................... 14
Separated Interface Timing into Table 3 ........................................5
Updates Outline Dimensions ........................................................ 18
Changes to Table 1 Through Table 3...............................................3
7/09Rev. B to Rev. C
Added Table 4 ....................................................................................6
Changes to Features Section............................................................ 1
Added Figure 2...................................................................................6
Updates Outline Dimensions ........................................................ 19
Changes to Absolute Maximum Ratings Section ..........................7
Changes to Ordering Guide .......................................................... 20
Deleted Parametric Test Circuits Section .......................................7
Changes to Typical Performance Characteristics..........................9
3/07Rev. A to Rev. B
Added Daisy-Chain Operation Section ...................................... 14
Updated Format .................................................................. Universal
Added ESD Protection Section ..................................................... 14
Changes to Absolute Maximum Ratings ....................................... 7
Added Terminal Voltage Operating Range Section ................... 14
Changes to ESD Protection Section ............................................. 14
Changes to Ordering Guide .......................................................... 19 Added Power-Up and Power-Down Sequences Section ........... 14
Added Layout and Power Supply Biasing Section ..................... 15
Added Applications Section .......................................................... 16
Updated Outline Dimensions ....................................................... 18
Changes to Ordering Guide .......................................................... 19
10/97Revision 0: Initial Version
Rev. D | Page 2 of 20