AD5282 Analog Devices, AD5282 Datasheet

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AD5282

Manufacturer Part Number
AD5282
Description
+15V/ I2C Compatible Digital Potentiometers
Manufacturer
Analog Devices
Datasheet

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a
FEATURES
256 Position
AD5280 – 1-Channel
AD5282 – 2-Channel (Independently Programmable)
Potentiometer Replacement
20K, 50K, 200K Ohm with TC < 50ppm/ºC
Internal Power ON Mid-Scale Preset
+5 to +15V Single-Supply; ±5.5V Dual-Supply Operation
I
APPLICATIONS
Multi-Media, Video & Audio
Communications
Mechanical Potentiometer Replacement
Instrumentation: Gain, Offset Adjustment
Programmable Voltage to Current Conversion
Line Impedance Matching
GENERAL DESCRIPTION
The AD5280/AD5282 provides a single/dual channel, 256 position
digitally-controlled variable resistor (VR) device. These devices
perform the same electronic adjustment function as a
potentiometer, trimmer or variable resistor. Each VR offers a
completely programmable value of resistance, between the A
terminal and the wiper, or the B terminal and the wiper. The fixed
A-to-B terminal resistance of 20, 50 or 200K ohms has a 1%
channel-to-channel matching tolerance with a nominal temperature
coefficient of 30 ppm/°C.
Wiper Position programming defaults to midscale at system power
ON. Once powered the VR wiper position is programmed by a I
compatible 2-wire serial data interface. Both parts have two
programmable logic outputs available to drive digital loads, gates,
LED drivers, analog switches, etc.
FUNCTIONAL BLOCK DIAGRAMS
REV PrE 12 MAR 02
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
2
C Compatible Interface
SHDN
GND
SDA
SCL
V
V
V
DD
SS
L
ADDRESS
DECODE
A
RDAC1 REGISTER
1
AD0
W
PRELIMINARY TECHNICAL DATA
AD1
1
SERIAL INPUT REGISTER
AD5280
R
B
1
RDAC2 REGISTER
O
1
8
PWR ON
RESET
O
2
R
2
C
One Technology Way, P.O. Box 9106,
Tel: 781/329-4700
Fax: 781/326-8703
The AD5280/AD5282 are available in ultra compact surface mount
thin TSSOP-14/-16 packages. All parts are guaranteed to operate
over the extended industrial temperature range of -40°C to +85°C.
For 3-wire, SPI compatible interface applications, see
AD5203/AD5204/AD5206/AD7376/AD8400/AD8402/AD8403/
AD5260/AD5262/AD5200/AD5201 products.
Model
AD5280BRU20
AD5280BRU50
AD5280BRU200
AD5282BRU20
AD5282BRU50
AD5282BRU200
The AD5280/AD5282 die size is 75 mil X 120 mil, 9,000 sq. mil.
Contains xxx transistors. Patent Number xxx applies.
SHDN
GND
SDA
SCL
V
V
V
DD
SS
L
ADDRESS
DECODE
A
RDAC1 REGISTER
1
AD0
Digital Potentiometers
Kilo
Ohms
20
50
200
20
50
200
+15V, I
ORDERING GUIDE
W
AD1
1
SERIAL INPUT REGISTER
AD5282
AD5280/AD5282
R
Temp
-40/+85°C
-40/+85°C
-40/+85°C
-40/+85°C
-40/+85°C
-40/+85°C
B
1
Norwood, MA 02062-9106 U
2
C Compatible
A
RDAC2 REGISTER
2
©Analog Devices, Inc., 2002
8
Package
Description
TSSOP-14
TSSOP-14
TSSOP-14
TSSOP-16
TSSOP-16
TSSOP-16
W
2
PWR ON
RESET
R
www.analog.com
B
2
REGISTER
RU-14
RU-16
R
Package
Option
RU-14
RU-14
RU-16
RU-16
OUTPUT
O
1
.
S
.
A
.

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AD5282 Summary of contents

Page 1

... C AD5280BRU20 AD5280BRU50 AD5280BRU200 AD5282BRU20 O O AD5282BRU50 1 2 AD5282BRU200 The AD5280/AD5282 die size is 75 mil X 120 mil, 9,000 sq. mil. Contains xxx transistors. Patent Number xxx applies. RDAC2 REGISTER R PWR ON RESET 8 One Technology Way, P.O. Box 9106, Tel: 781/329-4700 Fax: 781/326-8703 +15V Compatible ...

Page 2

... PRELIMINARY TECHNICAL DATA AD5280/AD5282 ELECTRICAL CHARACTERISTICS 20K, 50K, 200K OHM VERSION 0V, -40°C < T < +85°C unless otherwise noted Parameter Symbol DC CHARACTERISTICS RHEOSTAT MODE Specifications apply to all VRs 2 Resistor Differential NL R-DNL 2 Resistor Nonlinearity R-INL Nominal resistor tolerance 3 R Resistance Temperature Coefficient ...

Page 3

... H V =1Vrms + 2V dc DC, f=1KHz =0V, ±1 LSB error band 10K , f = 1KHz WB After this period the first clock pulse is generated = -5V AD5280/AD5282 = +5V +5V -5V LOGIC 1 Min Typ Max Units 650 kHz 142 kHz 69 kHz 0.005 % 2 µ ...

Page 4

... Package Power Dissipation (T J MAX - AD5280 PIN CONFIGURATION SHDN SHDN SHDN SHDN 9 6 SCL 8 7 SDA AD5282 PIN CONFIGURATION SHDN SHDN SHDN SHDN 10 7 SCL 9 ...

Page 5

... W to terminal B, and open circuit of terminal A. RDAC register contents unchanged. 7 SCL Serial Clock Input 8 SDA Serial Data Input/Output SDA t 1 SCL Data of AD5280/AD5282 is accepted from the Slave Address Byte Where: ...

Page 6

... In addition, the shutdown SHDN pin of AD5280/AD5282 places the RDAC in a zero power consumption state where terminal A is open circuited and the wiper W is connected to terminal B, resulting in only leakage currents being consumed in the VR structure ...

Page 7

... The RDACs are connected to this bus as slave devices. Referring from Figures 2 and 3, the first byte of AD5280/AD5282 is a Slave Address Byte. It has a 7-bit slave address and a R/W bit. The 5 MSBs are 01011 and the following REV PrE 12 MAR 02 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 408 382-3107 ...

Page 8

... Instruction, and Data Bytes again. Similarly, a repeated Read function of the RDAC is also allowed. MULTIPLE DEVICES ON ONE BUS Figure 5 shows four AD5282 devices on the same serial bus. Each has a different slave address sine the state of their AD0 and AD1 pins are different. This allows each RDAC within each device to be written to or read from independently ...

Page 9

... 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 408 382-3107; FAX 408 382-2721; email; walt.heinzer@analog.com AD5280/AD5282 Figure 14. Non-Inverting Gain test circuit Figure 15 ...

Page 10

... PRELIMINARY TECHNICAL DATA AD5280/AD5282 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 408 382-3107; FAX 408 382-2721; email; walt.heinzer@analog.com ...

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