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AD5235 Arkusz danych(PDF) 1 Page - Analog Devices

Numer części AD5235
Szczegółowy opis  Nonvolatile Memory, Dual 1024 Position Digital Potentiometers
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Strona internetowa  http://www.analog.com
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AD5235 Arkusz danych(HTML) 1 Page - Analog Devices

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PRELIMINARY TECHNICAL DATA
a
Nonvolatile Memory, Dual 1024
Position Digital Potentiometers
AD5235
REV PrD 6 Nov 2000
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 which 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
Fax:781/326-8703
FEATURES
Dual, 1024 Position Resolution
25K, 250K Ohm Terminal Resistance with 50ppm/°C Tempco
Nonvolatile Memory Preset
SPI Compatible Serial Data Input with Readback Function
Increment/Decrement Commands, Push Button Command
+3 to +5V Single Supply Operation
±2.5V Dual Supply Operation
30 bytes of general purpose nonvolatile memory
APPLICATIONS
Mechanical Potentiometer Replacement
Instrumentation: Gain, Offset Adjustment
Programmable Voltage to Current Conversion
Programmable Filters, Delays, Time Constants
Line Impedance Matching
Power Supply Adjustment
DIP Switch Setting
GENERAL DESCRIPTION
The AD5235 provides a dual channel, digitally controlled variable
resistor (VR) with resolutions of 1024 positions. These devices
perform the same electronic adjustment function as a potentiometer or
variable resistor. The AD5235’s versatile programming via a Micro
Controller allows multiple modes of operation and adjustment.
In the direct program mode a predetermined setting of the RDAC
register can be loaded directly from the micro controller. Another key
mode of operation allows the RDAC register to be refreshed with the
setting previously stored in the EEMEM register. When changes are
made to the RDAC register to establish a new wiper position, the
value of the setting can be saved into the EEMEM by executing an
EEMEM save operation. Once the settings are saved in the EEMEM
register, these values will be transferred automatically to the RDAC
register to set the wiper position at system power ON. Such operation
is enabled by the internal preset strobe and the preset can also be
accessed externally.
An internal scratch pad RDAC register can be programmed by the
micro controller to set the resistance between terminals W-and-B.
Once the target value is achieved, the RDAC content register can be
placed in the non-volatile memory for automatic recall during Power
Up.
The AD5235 is available in the thin TSSOP-16 package. All parts are
guaranteed to operate over the extended industrial temperature range
of -40°C to +85°C.
FUNCTIONAL BLOCK DIAGRAMS
GND
RDAC2
RDAC1
PWR ON
PRESET
SER I A L
IN P U T
R E GIST ER
RDAC1
REGISTER
PR
WP
CS
GND
VDD
W1
A1
B1
VSS
ADDRESS
DECO DE
RDY
CLK
EEMEM1
W2
A2
B2
EEMEM2
EEMEM
CONTROL
RDAC2
REGISTER
SDI
SDO
SPARE
EEMEM


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