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AD5121 Datasheet

(AD5121 / AD5141) Nonvolatile Digital Potentiometer

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Data Sheet
Single Channel, 128-/256-Position, I2C/SPI,
Nonvolatile Digital Potentiometer
AD5121/AD5141
FEATURES
10 kΩ and 100 kΩ resistance options
Resistor tolerance: 8% maximum
Wiper current: ±6 mA
Low temperature coefficient: 35 ppm/°C
Wide bandwidth: 3 MHz
Fast start-up time < 75 µs
Linear gain setting mode
Single- and dual-supply operation
Independent logic supply: 1.8 V to 5.5 V
Wide operating temperature: −40°C to +125°C
3 mm × 3 mm LFCSP package
4 kV ESD protection
APPLICATIONS
Portable electronics level adjustment
LCD panel brightness and contrast controls
Programmable filters, delays, and time constants
Programmable power supplies
FUNCTIONAL BLOCK DIAGRAM
VLOGIC
VDD
INDEP
POWER-ON
RESET
AD5121/
AD5141
RESET
DIS
SCLK/SCL
SDI/SDA
SYNC/ADDR0
SDO/ADDR1
SERIAL
7/8
INTERFACE
RDAC
INPUT
REGISTER
EEPROM
MEMORY
A
W
B
GND VSS
Figure 1.
WP
GENERAL DESCRIPTION
The AD5121/AD5141 potentiometers provide a nonvolatile
solution for 128-/256-position adjustment applications, offering
guaranteed low resistor tolerance errors of ±8% and up to ±6 mA
current density in the A, B, and W pins.
The low resistor tolerance and low nominal temperature coefficient
simplify open-loop applications as well as applications requiring
tolerance matching.
The linear gain setting mode allows independent programming
of the resistance between the digital potentiometer terminals,
through RAW and RWB string resistors, allowing very accurate
resistor matching.
The high bandwidth and low total harmonic distortion (THD)
ensure optimal performance for ac signals, making it suitable
for filter design.
The low wiper resistance of only 40 Ω at the ends of the resistor
array allows for pin-to-pin connection.
The wiper values can be set through an SPI-/I2C-compatible digital
interface that is also used to read back the wiper register and
EEPROM contents.
The AD5121/AD5141 is available in a compact, 16-lead, 3 mm ×
3 mm LFCSP. The parts are guaranteed to operate over the
extended industrial temperature range of −40°C to +125°C.
Rev. 0
Document Feedback
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responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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.
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Table 1. Family Models
Model
Channel Position
AD51231 Quad
128
AD5124 Quad
128
AD5124 Quad
128
AD51431 Quad
256
AD5144 Quad
256
AD5144 Quad
256
AD5144A Quad
256
AD5122 Dual
128
AD5122A Dual
128
AD5142 Dual
256
AD5142A Dual
256
AD5121 Single
128
AD5141 Single
256
Interface
I2C
SPI/I2C
SPI
I2C
SPI/I2C
SPI
I2C
SPI
I2C
SPI
I2C
SPI/I2C
SPI/I2C
Package
LFCSP
LFCSP
TSSOP
LFCSP
LFCSP
TSSOP
TSSOP
LFCSP/TSSOP
LFCSP/TSSOP
LFCSP/TSSOP
LFCSP/TSSOP
LFCSP
LFCSP
1 Two potentiometers and two rheostats.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
©2012 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
Free Datasheet http://www.datasheet4u.com/
Analog Devices
Analog Devices


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