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AD5253 Datasheet(PDF) 1 Page - Analog Devices

Part No. AD5253
Description  Quad 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD5253 Datasheet(HTML) 1 Page - Analog Devices

 
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Quad 64-/256-Position I2C Nonvolatile
Memory Digital Potentiometers
AD5253/AD5254
Rev. 0
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. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703
© 2004 Analog Devices, Inc. All rights reserved.
FEATURES
AD5253: Quad 64-position resolution
AD5254: Quad 256-position resolution
1 kΩ, 10 kΩ, 50 kΩ, 100 kΩ
Nonvolatile memory1 stores wiper settings with write
protection
Power-on refreshed to EEMEM settings in 300 µs typ
EEMEM rewrite time = 540 µs typ
Resistance tolerance stored in nonvolatile memory
12 extra bytes in EEMEM for user-defined information
I2C® compatible serial interface
Direct read/write accesses of RDAC2 and EEMEM registers
Predefined linear increment/decrement commands
Predefined ±6 dB step change commands
Synchronous or asynchronous quad channel update
Wiper setting readback
4 MHz bandwidth—1 kΩ version
Single supply 2.7 V to 5.5 V
Dual supply ±2.25 V to ±2.75 V
2 slave address decoding bits allow operation of 4 devices
100-year typical data retention, TA = 55°C
Operating temperature: –40°C to +85°C
APPLICATIONS
Mechanical potentiometer replacement
Low resolution DAC replacement
RGB LED backlight control
White LED brightness adjustment
RF base station power amp bias control
Programmable gain and offset control
Programmable attenuators
Programmable voltage-to-current conversion
Programmable power supply
Programmable filters
Sensor calibrations
GENERAL DESCRIPTION
The AD5253/AD5254 are quad channel, I2C, nonvolatile mem-
ory, digitally controlled potentiometers with 64/256 positions,
respectively. These devices perform the same electronic adjust-
ment functions as mechanical potentiometers, trimmers, and
variable resistors.
The AD5253/AD5254’s versatile programmability allows multi-
ple modes of operation, including read/write accesses in the
RDAC and EEMEM registers, increment/decrement of
resistance, resistance changes in ±6 dB scales, wiper setting
readback, and extra EEMEM for storing user-defined informa-
tion, such as memory data for other components, look-up table,
or system identification information.
FUNCTIONAL BLOCK DIAGRAM
RDAC0
REGIS-
TER
RDAC1
REGIS-
TER
RDAC2
REGIS-
TER
RDAC3
REGIS-
TER
RDAC0
RDAC1
RDAC2
RDAC3
DATA
CONTROL
COMMAND
DECODE LOGIC
ADDRESS
DECODE LOGIC
CONTROL LOGIC
AD5253/AD5254
I2C
SERIAL
INTERFACE
VDD
A0
W0
B0
A1
W1
B1
A2
W2
B2
A3
W3
B3
VSS
DGND
SCL
SDA
AD0
AD1
WP
EEMEM
POWER-ON
REFRESH
RAB TOL
RDAC EEMEM
Figure 1.
The AD5253/AD5254 allow the host I2C controllers to write any
of the 64-/256-step wiper settings in the RDAC registers and
store them in the EEMEM. Once the settings are stored, they are
restored automatically to the RDAC registers at system power-
on; the settings can also be restored dynamically.
The AD5253/AD5254 provide additional increment, decrement,
+6 dB step change, and –6 dB step change in synchronous or
asynchronous channel update modes. The increment and
decrement functions allow stepwise linear adjustments, while
±6 dB step changes are equivalent to doubling or halving the
RDAC wiper setting. These functions are useful for steep-slope
nonlinear adjustment applications such as white LED brightness
and audio volume control.
The AD5253/AD5254 have a patented resistance tolerance
storing function that allows the user to access the EEMEM and
obtain the absolute end-to-end resistance values of the RDACs
for precision applications.
The AD5253/AD5254 are available in TSSOP-20 packages in
1 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ options. All parts are
guaranteed to operate over the –40°C to +85°C extended
industrial temperature range.
1The terms nonvolatile memory and EEMEM are used interchangeably.
2The terms digital potentiometer and RDAC are used interchangeably.


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