1

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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Single, 128-taps Low Voltage Digitally Controlled

Potentiometer (XDCP™)

ISL23318

The ISL23318 is a volatile, low voltage, low noise, low power,

(DCP), which integrates DCP core, wiper switches and control

logic on a monolithic CMOS integrated circuit.

The digitally controlled potentiometer is implemented with a

combination of resistor elements and CMOS switches. The

position of the wipers are controlled by the user through the

volatile Wiper Register (WR) that can be directly written to and

read by the user. The contents of the WR controls the position

of the wiper. When powered on, the ISL23318’s wiper will

always commence at mid-scale (64 tap position).

The low voltage, low power consumption, and small package

of the ISL23318 make it an ideal choice for use in battery

pin allowing down to 1.2V bus operation, independent from the

directly to the ISL23318 without passing through a voltage

level shifter.

The DCP can be used as a three-terminal potentiometer or as a

two-terminal variable resistor in a wide variety of applications

including control, parameter adjustments, and signal

processing.

Features

•128 resistor taps

- No additional level translator for low bus supply

- Two address pins allow up to four devices per bus

•Power supply

• Shutdown Mode - forces the DCP into an end-to-end open

• Power-on preset to mid-scale (64 tap position)

• Shutdown and standby current <2.8µA max

•10kΩ

, 50kΩ or 100kΩ total resistance

• 10 Ld MSOP or 10 Ld UTQFN packages

• Pb-free (RoHS compliant)

Applications

• Gain adjustment in battery powered instruments

• Trimming sensor circuits

• Power supply margining

• RF power amplifier bias compensation

FIGURE 1. FORWARD AND BACKWARD RESISTANCE vs TAP

POSITION, 10k DCP

0

2000

4000

6000

8000

10000

032

64

96

128

TAP POSITION (DECIMAL)

ISL28114

ISL23318

+

-

RL

RW

RH

July 26, 2011

FN7887.0