ANALOG DEVICES AD5162 Service Manual

Dual, 256-Position, SPI

AD5162

A1

A = 0 A = 1

V

DD

GND

SDI

CLK

CS

W1

WIPER

REGISTER 1

SPI INTERFACE

AD5162

B1 W2

W

IPER

REGISTER 2

B2

FEATURES

2-channel, 256-position potentiometer
End-to-end resistance: 2.5 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ
Compact 10-lead MSOP (3 mm × 4.9 mm) package
Fast settling time: t
Full read/write of wiper register
Power-on preset to midscale
Computer software replaces microcontroller in factory

programming applications
Single supply: 2.7 V to 5.5 V
Low temperature coefficient: 35 ppm/°C
Low power: I
Wide operating temperature: −40°C to +125°C
Evaluation board available
Qualified for automotive applications

APPLICATIONS

Systems calibrations
Electronics level settings
Mechanical trimmers replacement in new designs
Permanent factory PCB setting
Transducer adjustment of pressure, temperature, position,

chemical, and optical sensors
RF amplifier biasing
Automotive electronics adjustment
Gain control and offset adjustment

= 5 µs typical on power-up

S

= 6 µA maximum

DD

Digital Potentiometer

FUNCTIONAL BLOCK DIAGRAM

Figure 1.

GENERAL DESCRIPTION

The AD5162 provides a compact 3 mm × 4.9 mm packaged
solution for dual, 256-position adjustment applications. This
device performs the same electronic adjustment function as a
3-terminal mechanical potentiometer. Available in four end-to­end resistance values (2.5 kΩ, 10 kΩ, 50 kΩ, 100 kΩ), this low
temperature coefficient device is ideal for high accuracy and
stability-variable resistance adjustments. The wiper settings are
controllable through an SPI digital interface. The resistance
between the wiper and either endpoint of the fixed resistor
varies linearly with respect to the digital code transferred into
the RDAC latch.

1

1

The terms digita l potentiometer, VR, and RDAC are used interchangeably.

Rev. C

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. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.

Operating from a 2.7 V to 5.5 V power supply and consuming
less than 6 µA allows the AD5162 to be used in portable battery­operated applications.

For applications that program the AD5162 at the factory,
Analog Devices offers device programming software running
on Windows® NT/2000/XP operating systems. This software
effectively replaces the need for external SPI controllers, which
in turn enhances the time to market of systems. An AD5162
evaluation kit and software are available. The kit includes a
cable and instruction manual.

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