Name: AD5280BRU20
SKU: AD5280BRU20
Price: 2.61282 USD
Availability: OutOfStock

PRELIMINARY TECHNICAL DATA

+15V, I2C Compatible

Digital Potentiometers

Preliminary Technical Data AD5280/AD5282

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.

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 ©Analog Devices, Inc., 2002

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

C Compatible Interface

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

RDAC1 REGISTER

ADDRESS

DECODE

SERIAL INPUT REGISTER

PWR ON

RESET

SDA

SCL

GND

AD5280

SHDN

RDAC2 REGISTER

AD0 AD1

RDAC1 REGISTER

ADDRESS

DECODE

SERIAL INPUT REGISTER

PWR ON

RESET

SDA

SCL

GND

AD5282

SHDN

RDAC2 REGISTER

AD0 AD1

OUTPUT

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.

ORDERING GUIDE

Kilo Package Package

Model Ohms Temp Description Option

AD5280BRU20 20 -40/+85°C TSSOP-14 RU-14

AD5280BRU50 50 -40/+85°C TSSOP-14 RU-14

AD5280BRU200 200 -40/+85°C TSSOP-14 RU-14

AD5282BRU20 20 -40/+85°C TSSOP-16 RU-16

AD5282BRU50 50 -40/+85°C TSSOP-16 RU-16

AD5282BRU200 200 -40/+85°C TSSOP-16 RU-16

The AD5280/AD5282 die size is 75 mil X 120 mil, 9,000 sq. mil.

Contains xxx transistors. Patent Number xxx applies.

PRELIMINARY TECHNICAL DATA

AD5280/AD5282

2 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; FAX 408 382-2721; email; walt.heinzer@analog.com

ELECTRICAL CHARACTERISTICS 20K, 50K, 200K OHM VERSION

= +5V, V

= -5V, V

LOGIC

= +5V,

= +V

, V

= 0V, -40°C < T

< +85°C unless otherwise noted.)

Parameter Symbol Conditions Min Typ

Max Units

DC CHARACTERISTICS RHEOSTAT MODE Specifications apply to all VRs

Resistor Differential NL

R-DNL R

, V

=NC -1 ±0.4 +1 LSB

Resistor Nonlinearity

R-INL R

, V

=NC -1 ±0.5 +1 LSB

Nominal resistor tolerance

∆R T

= 25°C -30 30 %

Resistance Temperature Coefficient R

/∆T V

= V

, Wiper = No Connect 30 ppm/°C

Wiper Resistance R

= V

/R, V

= +3V or +5V 40 100 Ω

DC CHARACTERISTICS POTENTIOMETER DIVIDER MODE Specifications apply to all VRs

Resolution N 8 Bits

Integral Nonlinearity

INL R

=20KΩ, 50KΩ –1 ±0.5 +1 LSB

Integral Nonlinearity

INL R

=200KΩ –2 ±0.5 +2 LSB

Differential Nonlinearity

DNL –1 ±0.4 +1 LSB

Voltage Divider Temperature Coefficient ∆V

/∆T Code = 80

5 ppm/°C

Full-Scale Error V

WFSE

Code = FF

–1 -0.5 +0 LSB

Zero-Scale Error V

WZSE

Code = 00

0 +0.5 +1 LSB

RESISTOR TERMINALS

Voltage Range

A,B,W

Capacitance

A, B C

A,B

f = 1 MHz, measured to GND, Code = 80

45 pF

Capacitance

W C

f = 1 MHz, measured to GND, Code = 80

60 pF

Common Mode Leakage I

= V

1 nA

DIGITAL INPUTS

Input Logic High V

SDA & SCL 0.7V

LOGIC

+0.5 V

Input Logic Low V

SDA & SCL -0.5 0.3V

LOGIC

Input Logic High V

AD0 & AD1 2.4 V

LOGIC

Input Logic Low V

AD0 & AD1 0 0.8 V

Input Logic High V

LOGIC

= +3V, AD0 & AD1 2.1 V

LOGIC

Input Logic Low V

LOGIC

= +3V, AD0 & AD1 0 0.6 V

Input Current I

= 0V or +5V ±1 µA

Input Capacitance

3 pF

DIGITAL Output

O1, O2 V

=0.4mA 2.4 5.5 V

O1, O2 V

=-1.6mA 0 0.4 V

SDA V

= -6mA 0.6 V

SDA V

= -3mA 0.4 V

Three-State Leakage Current I

= 0V or +5V ±1 µA

Output Capacitance

3 8 pF

POWER SUPPLIES

Logic Supply V

LOGIC

+2.7 +5.5 V

Power Single-Supply Range V

DD RANGE

= 0V +5 +15 V

Power Dual-Supply Range V

DD/SS RANGE

±4.5 ±5.5 V

Logic Supply Current I

LOGIC

= +5V 10 µA

Positive Supply Current I

= +5V or V

= 0V 20 60 µA

Negative Supply Current I

20 60 µA

Power Dissipation

DISS

= +5V or V

= 0V, V

= +5V, V

= -5V 0.2 0.6 mW

Power Supply Sensitivity PSS 0.05 0.015 %/%

PRELIMINARY TECHNICAL DATA

AD5280/AD5282

REV PrE 12 MAR 02 3

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

ELECTRICAL CHARACTERISTICS 20K, 50K, 200K OHM VERSION

= +5V, V

= -5V, V

LOGIC

= +5V,

= +V

, V

= 0V, -40°C < T

< +85°C unless otherwise noted.)

Parameter Symbol Conditions Min Typ

Max Units

DYNAMIC CHARACTERISTICS

6,9,11

Bandwidth –3dB BW_20K R

= 20KΩ, Code = 80

650 kHz

BW_50K R

= 50KΩ, Code = 80

142 kHz

BW_200K R

= 200KΩ, Code = 80

69 kHz

Total Harmonic Distortion THD

=1Vrms + 2V dc, V

= 2V DC, f=1KHz 0.005 %

Settling Time t

= V

, V

=0V, ±1 LSB error band 2 µs

Resistor Noise Voltage e

N_WB

= 10KΩ, f = 1KHz 14 nV√Hz

INTERFACE TIMING CHARACTERISTICS applies to all parts(Notes 6,12)

SCL Clock Frequency f

SCL

0 400 KHz

BUF

Bus free time between STOP & START t1 1.3 µs

HD;STA

Hold Time (repeated START) t2 After this period the first clock pulse is generated 0.6 µs

LOW

Low Period of SCL Clock t3 1.3 µs

HIGH

High Period of SCL Clock t4 0.6 µs

SU;STA

Setup Time For START Condition t5 0.6 µs

HD;DAT

Data Hold Time t6 0 0.9 µs

SU;DAT

Data Setup Time t7 100 ns

Fall Time of both SDA & SCL signals t8 300 ns

Rise Time of both SDA & SCL signals t9 300 ns

SU;STO

Setup time for STOP Condition t10 0.6 µs

NOTES:

1. Typicals represent average readings at +25°C, V

= +5V, V

= -5V.

2. Resistor position nonlinearity error R-INL is the deviation from an ideal value measured between the maximum resistance and the minimum resistance wiper positions. R-DNL measures the

relative step change from ideal between successive tap positions. Parts are guaranteed monotonic.

3. V

= V

, Wiper (V

) = No connect

4. INL and DNL are measured at V

with the RDAC configured as a potentiometer divider similar to a voltage output D/A converter. V

= V

and V

= 0V.

DNL specification limits of ±1LSB maximum are Guaranteed Monotonic operating conditions.

5. Resistor terminals A,B,W have no limitations on polarity with respect to each other.

6. Guaranteed by design and not subject to production test.

9. Bandwidth, noise and settling time are dependent on the terminal resistance value chosen. The lowest R value results in the fastest settling time and highest bandwidth. The highest R value

result in the minimum overall power consumption.

10. P

DISS

is calculated from (I

x V

). CMOS logic level inputs result in minimum power dissipation.

11. All dynamic characteristics use V

= +5V.

12. See timing diagram for location of measured values.

Part #	AD5280BRU20
Description	Digital Potentiometer 256POS20KOhm Single 14-Pin TSSOP
Category	IC
Availability	Out of Stock
Qty	0

AD5280BRU20

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