1

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

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Quad, 256 Tap, Low Voltage Digitally Controlled

Potentiometer (XDCP™)

ISL23345

The ISL23345 is a volatile, low voltage, low noise, low power,

256 tap, quad digitally controlled potentiometer (DCP) with an

and control logic on a monolithic CMOS integrated circuit.

Each 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 (WRi, i = 0, 1, 2, 3) that can be directly

written to and read by the user. The contents of the WRi

controls the position of the wiper. When powered on, the wiper

of each DCP will always commence at mid-scale (128 tap

position).

The low voltage, low power consumption, and small package

of the ISL23345 make it an ideal choice for use in battery

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

directly to the ISL23345 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.

Applications

• Power supply margining

• Trimming sensor circuits

• Gain adjustment in battery powered instruments

• RF power amplifier bias compensation

Features

• Four potentiometers per package

• 256 resistor taps

•10k

Ω, 50kΩ or 100kΩ total resistance

- No additional level translator for low bus supply

- Three address pins allow up to eight devices per bus

• Maximum supply current without serial bus activity

(standby)

•Shutdown Mode

- Forces the DCP into an end-to-end open circuit and RWi is

connected to RLi internally

- Reduces power consumption by disconnecting the DCP

resistor from the circuit

•Power supply

• Wiper resistance: 70

• Power-on preset to mid-scale (128 tap position)

• 20 Ld TSSOP or 20 QFN packages

• Pb-free (RoHS compliant)

FIGURE 1. FORWARD AND BACKWARD RESISTANCE vs TAP

POSITION, 10kΩ DCP

0

2000

4000

6000

8000

10000

0

64

128

192

256

TAP POSITION (DECIMAL)

ISL28114

1 DCP

of

ISL23345

+

-

RL1

RW1

RH1

June 21, 2011

FN7872.0