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AD5253BRU100-RL7 Datasheet

  • AD5253BRU100-RL7

  • Quad 64-/256-Position I2C Nonvolatile Memory Digital Potenti...

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Quad 64-/256-Position I
2
C Nonvolatile
Memory Digital Potentiometers
AD5253/AD5254
FEATURES
AD5253: Quad 64-position resolution
AD5254: Quad 256-position resolution
1 k鈩? 10 k鈩? 50 k鈩? 100 k鈩?/div>
Nonvolatile memory
1
stores wiper settings with write
protection
Power-on refreshed to EEMEM settings in 300 碌s typ
EEMEM rewrite time = 540 碌s typ
Resistance tolerance stored in nonvolatile memory
12 extra bytes in EEMEM for user-defined information
I
2
C廬 compatible serial interface
Direct read/write accesses of RDAC
2
and EEMEM registers
Predefined linear increment/decrement commands
Predefined 鹵6 dB step change commands
Synchronous or asynchronous quad channel update
Wiper setting readback
4 MHz bandwidth鈥? k鈩?version
Single supply 2.7 V to 5.5 V
Dual supply 鹵2.25 V to 鹵2.75 V
2 slave address decoding bits allow operation of 4 devices
100-year typical data retention, T
A
= 55擄C
Operating temperature: 鈥?0擄C to +85擄C
V
DD
V
SS
DGND
WP
SCL
SDA
DATA
I
2
C
SERIAL
INTERFACE
AD0
AD1
CONTROL
COMMAND
DECODE LOGIC
ADDRESS
DECODE LOGIC
CONTROL LOGIC
RDAC3
RDAC3
REGIS-
TER
A3
W3
B3
03824-0-001
FUNCTIONAL BLOCK DIAGRAM
RDAC EEMEM
EEMEM
POWER-ON
REFRESH
R
AB
TOL
RDAC0
REGIS-
TER
RDAC0
A0
W0
B0
RDAC1
RDAC1
REGIS-
TER
A1
W1
B1
RDAC2
RDAC2
REGIS-
TER
A2
W2
B2
AD5253/AD5254
Figure 1.
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
The AD5253/AD5254 allow the host I
2
C 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 鈥? dB step change in synchronous or
asynchronous channel update modes. The increment and
decrement functions allow stepwise linear adjustments, while
鹵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 k鈩? 10 k鈩? 50 k鈩? and 100 k鈩?options. All parts are
guaranteed to operate over the 鈥?0擄C to +85擄C extended
industrial temperature range.
GENERAL DESCRIPTION
The AD5253/AD5254 are quad channel, I
2
C, 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鈥檚 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 鹵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.
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.
1
2
The terms nonvolatile memory and EEMEM are used interchangeably.
The terms digital potentiometer and RDAC are used interchangeably.
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
漏 2004 Analog Devices, Inc. All rights reserved.

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