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AD5231BRU50-REEL7 Datasheet

  • AD5231BRU50-REEL7

  • Nonvolatile Memory, 1024-Position Digital Potentiometers

  • 24頁

  • AD

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a
Nonvolatile Memory,
1024-Position Digital Potentiometers
AD5231
*
FUNCTIONAL BLOCK DIAGRAM
CS
CLK
SDI
GND
SDI
SERIAL
INTERFACE
EEMEM1
ADDR
DECODE
RDAC
REGISTER
FEATURES
Nonvolatile Memory
1
Preset Maintains Wiper Settings
1024-Position Resolution
Full Monotonic Operation
10 k , 50 k , and 100 k Terminal Resistance
Permanent Memory Write-Protection
Wiper Settings Read Back
Linear Increment/Decrement
Log Taper Increment/Decrement
Push Button Increment/Decrement Compatible
SPI Compatible Serial Interface with Readback Function
3 V to 5 V Single Supply or 2.5 V Dual Supply
28 Bytes User Nonvolatile Memory for Constant Storage
100 Year Typical Data Retention T
A
= 55 C
APPLICATIONS
Mechanical Potentiometer Replacement
Instrumentation: Gain, Offset Adjustment
Programmable Voltage to Current Conversion
Programmable Filters, Delays, Time Constants
Line Impedance Matching
Power Supply Adjustment
Low Resolution DAC Replacement
AD5231
RDAC
V
DD
A
W
B
SDO
WP
RDY
SDO
EEMEM
CONTROL
DIGITAL
REGISTER
2
O1
DIGITAL
OUTPUT
BUFFER
O2
EEMEM2
28 BYTES
USER EEMEM
PR
V
SS
100
R
WA
(D), R
WB
(D) 鈥?Percent of Nominal 鈥?% R
AB
R
WA
R
WB
75
GENERAL DESCRIPTION
50
The AD5231 provides nonvolatile memory digitally controlled
potentiometers
2
with 1024-position resolution. These devices
perform the same electronic adjustment function as a mechanical
potentiometer. The AD5231鈥檚 versatile programming via a stan-
dard 3-wire serial interface allows 16 modes of operation and
adjustment, including scratch pad programming, memory stor-
ing and retrieving, increment/decrement, log taper adjustment,
wiper setting read back, and extra user-defined EEMEM.
In the scratch pad programming mode, a specific setting can be
programmed directly to the RDAC
2
register, which sets the resis-
tance at terminals W-A and W-B. The RDAC register can also
be loaded with a value previously stored in the EEMEM
1
regis-
ter. The value in the EEMEM can be changed or protected.
When changes are made to the RDAC register, the value of the
new setting can be saved into the EEMEM. Thereafter, such value
will be transferred automatically to the RDAC register during
system power ON. It is enabled by the internal preset strobe.
EEMEM can also be retrieved through direct programming and
external preset pin control.
25
0
0
256
512
CODE 鈥?Decimal
768
1023
Figure 1. R
WA
(D) and R
WB
(D) vs. Decimal Code
Other operations include linear step increment and decrement
commands such that the setting in the RDAC register can be
moved UP or DOWN, one step at a time. For logarithmic changes
in wiper setting, a left/right bit shift command adjusts the level
in
鹵
6 dB steps.
The AD5231 is available in thin TSSOP-16 package. All parts
are guaranteed to operate over the extended industrial tempera-
ture range of 鈥?0擄C to +85擄C.
NOTES
1
The terms Nonvolatile Memory and EEMEM are used interchangeably.
2
The terms Digital Potentiometer and RDAC are used interchangeably.
*Patent
pending
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. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
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 Analog Devices, Inc., 2001

AD5231BRU50-REEL7 產(chǎn)品屬性

  • 1,000

  • 集成電路 (IC)

  • 數(shù)據(jù)采集 - 數(shù)字電位器

  • -

  • 1024

  • 50k

  • 1

  • 標準值 600 ppm/°C

  • 非易失

  • 4 線 SPI（芯片選擇）

  • 2.7 V ~ 5.5 V，±2.25 V ~ 2.75 V

  • -40°C ~ 85°C

  • 表面貼裝

  • 16-TSSOP（0.173"，4.40mm 寬）

  • 16-TSSOP

  • 帶卷 (TR)

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