Nonvolatile Memory, Quad
64-Position Digital Potentiometer
AD5233
FEATURES
FUNCTIONAL BLOCK DIAGRAM
Nonvolatile memory stores wiper setting
4-channel independent programmable
64-position resolution
Power-on refreshed with EEMEM settings
EEMEM restore time: 140 μs typical
AD5233
V
DD
ADDR
DECODE
RDAC1
REGISTER
CS
CLK
SDI
A1
W1
SDI SERIAL
INTERFACE
B1
EEMEM1
SDO
SDO
RDAC1
RDAC2
RDAC3
RDAC4
Full monotonic operation
WP
RDAC2
REGISTER
EEMEM
CONTROL
10 kΩ, 50 kΩ, and 100 kΩ terminal resistance
Permanent memory write protection
Wiper setting readback
Predefined linear increment/decrement instructions
Predefined 6 dB/step log taper increment/decrement
instructions
SPI-compatible serial interface with readback function
2.7 V to 5.5 V single supply or 2.5 V dual supply
11 bytes extra nonvolatile memory for user-defined data
100-year typical data retention, TA = 55°C
A2
RDY
W2
B2
11 BYTES
USER EEMEM
EEMEM2
RDAC3
REGISTER
DIGITAL
OUTPUT
BUFFER
O1
O2
A3
W3
2
B3
EEMEM3
DIGITAL 5
REGISTER
RDAC4
REGISTER
A4
PR
W4
APPLICATIONS
B4
EEMEM5
EEMEM4
Mechanical potentiometer replacement
Instrumentation: gain, offset adjustment
Programmable voltage-to-current conversion
Programmable filters, delays, time constants
Programmable power supply
GND
V
SS
Figure 1.
Sensor calibration
GENERAL DESCRIPTION
The AD5233 is a quad-channel nonvolatile memory,1 digitally
controlled potentiometer2 with a 64-step resolution. The device
performs the same electronic adjustment function as a mechanical
potentiometer with enhanced resolution, solid-state reliability,
and remote controllability. The AD5233 has versatile program-
ming using a serial peripheral interface (SPI) for 16 modes of
operation and adjustment, including scratchpad programming,
memory storing and restoring, increment/decrement, 6 dꢀ/step
log taper adjustment, wiper setting readback, and extra EEMEM
for user-defined information such as memory data for other
components, look-up tables, or system identification
information.
In the scratchpad programming mode, a specific setting can
be programmed directly to the RDAC register, which sets the
resistance between Terminal W to Terminal A and Terminal W
to Terminal ꢀ. This setting can be stored into the EEMEM and
is transferred automatically to the RDAC register during system
power-on.
The EEMEM content can be restored dynamically or through
PR
WP
external
strobing. A
function protects EEMEM contents.
To simplify the programming, independent or simultaneous
increment or decrement commands can be used to move the
RDAC wiper up or down, one step at a time. For logarithmic
6 dꢀ step changes in wiper settings, the left or right bit shift
command can be used to double or halve the RDAC wiper
setting.
The AD5233 is available in a thin 24-lead TSSOP package. The
part is guaranteed to operate over the extended industrial
temperature range of −40°C to +85°C.
1 The terms nonvolatile memory and EEMEM are used interchangeably.
2 The terms digital potentiometer and RDAC are used interchangeably.
Rev. B
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 registeredtrademarks arethe 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: 781.461.3113 ©2002–2008 Analog Devices, Inc. All rights reserved.
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