AD5235 Analog Devices, AD5235 Datasheet

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AD5235

Manufacturer Part Number
AD5235
Description
8-Bit Dual Nonvolatile Memory Digital Potentiometer
Manufacturer
Analog Devices
Datasheet

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a
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.
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.
PRELIMINARY TECHNICAL DATA
Tel: 781/329-4700
Nonvolatile Memory, Dual 1024
Position Digital Potentiometers
One Technology Way, P.O. Box 9106,
CLK
CS
SDI
SDO
RDY
WP
PR
PWR ON
PRESET
CONTROL
R E G IS T E R
EEMEM
FUNCTIONAL BLOCK DIAGRAMS
S E R I A L
IN P U T
ADDRESS
DECODE
G ND
Norwood, MA 02062-9106 U
REGISTER
REGISTER
EEMEM2
EEMEM1
RDAC1
RDAC2
EEMEM
SPARE
AD5235
Fax:781/326-8703
RDAC1
RDAC2
.
S
.
A
.
V DD
A1
W1
B1
A2
W2
B2
V SS
G ND

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AD5235 Summary of contents

Page 1

... 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. ...

Page 2

... VDD, V =0V, 50% of final value A B 25K/250K R = 10K , f = 1KHz 0V, Measue V with adjacent making full scale change 2 AD5235 (V = +3V±10% or +5V±10% and V =0V Min Typ Max Units -1 ±1/4 +1 LSB -2 ±1/2 +2 LSB - ppm/°C ...

Page 3

... SDO CLK IDLES LOW SDO CLK IDLES HIGH Figure 1. Timing Diagram 3 AD5235 (V = +3V±10% to +5V±10% and Min Typ Max for both V =+ =+5V ...

Page 4

... X2/25 -40/+85°C TSSOP-16 AD5235BRU250 X2/250 -40/+85°C TSSOP-16 The AD5235 contains 16,000 transistors. Die size: 100 x 105 mil = 10,500 sq. mil REV PrD 6 NOV, 2000 Information contained in this Product Concept data sheet describes a product in the early definition stage. There is no guarantee that the information contained here will become a final product in its present form. For latest information contact Walt Heinzer/Analog Devices, Santa Clara, CA. TEL(408)562-7254 ...

Page 5

... PRELIMINARY TECHNICAL DATA Nonvolatile Memory Digital Potentiometers OPERATIONAL OVERVIEW The AD5235 digital potentiometer is designed to operate as a true variable resistor replacement device for analog signals that remain within the terminal voltage range of V <V SS voltage range is limited <5.5V. Control of the digital DD SS ...

Page 6

... PRELIMINARY TECHNICAL DATA Nonvolatile Memory Digital Potentiometers Table 2. AD5235 Instruction/Operation Truth Table Inst Instruction Byte 1 B15 •••••••••••••••• ...

Page 7

... The number of points is the resolution of the device. The AD5235 has 1024 connection points allowing it to provide better than 0.5% set-ability resolution. Figure 3 provides an equivalent diagram of the connections between the three terminals that make up one channel of the RDAC ...

Page 8

... Figure 5C. Equivalent SDO Output ESD Protection Circuit Figure 5 shows the equivalent ESD protection circuit for digital pins. Figure 6 shows the equivalent analog-terminal protection circuit for the variable resistors. Figure 6. Equivalent VR-Terminal ESD Protection 8 AD5235 ...

Page 9

... For latest information contact Walt Heinzer/Analog Devices, Santa Clara, CA. TEL(408)562-7254; FAX (408)727-1550; walt.heinzer@analog.com Figure 12. Non-Inverting Gain test circuit Figure 13. Gain Vs Frequency test circuit Figure 14. Incremental ON Resistance Test Circuit Figure 15. Common Mode Leakage current test circuit TYPICAL PERFORMANCE GRAPHS TBD 9 AD5235 ...

Page 10

... Information contained in this Product Concept data sheet describes a product in the early definition stage. There is no guarantee that the information contained here will become a final product in its present form. For latest information contact Walt Heinzer/Analog Devices, Santa Clara, CA. TEL(408)562-7254; FAX (408)727-1550; walt.heinzer@analog.com OUTLINE DIMENSIONS Dimensions shown in inches and (mm) 10 AD5235 ...

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