isl23328 Intersil Corporation, isl23328 Datasheet

isl23328

Manufacturer Part Number

isl23328

Description

Dual, 128-tap, Low Voltage Digitally Controlled Potentiometer Xdcp™

Manufacturer

Intersil Corporation

Datasheet

1.ISL23328.pdf (20 pages)

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Dual, 128-Tap, Low Voltage Digitally Controlled

Potentiometer (XDCP™)

ISL23328

The ISL23328 is a volatile, low voltage, low noise, low power,

128-Tap, dual 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 I

bus interface. Each potentiometer has an associated volatile

Wiper Register (WRi, i = 0, 1) 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 (64 tap position).

The low voltage, low power consumption, and small package

of the ISL23328 make it an ideal choice for use in battery

operated equipment. In addition, the ISL23328 has a V

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

directly to the ISL23328 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

August 19, 2011

FN7902.0

C Bus™ interface. It integrates two DCP cores, wiper switches

10000

FIGURE 1. FORWARD AND BACKWARD RESISTANCE vs TAP

8000

6000

4000

2000

value. This allows for low logic levels to be connected

POSITION, 10kΩ DCP

TAP POSITION (DECIMAL)

LOGIC

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

Intersil (and design) and XDCP are trademarks owned by Intersil Corporation or one of its subsidiaries.

128

1-888-INTERSIL or 1-888-468-3774

Features

• Two potentiometers per package

• 128 resistor taps

• 10kΩ, 50kΩ or 100kΩ total resistance

• I

• Power supply

• Maximum supply current without serial bus activity

• Shutdown Mode

• Wiper resistance: 70Ω typical @ V

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

• Extended industrial temperature range: -40

• 14 Ld TSSOP or 16 Ld UTQFN packages

• Pb-free (RoHS Compliant)

- No additional level translator for low bus supply

- Three address pins allow up to eight devices per bus

- V

(standby)

- 3µA @ V

- 1.7µA @ V

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

- Reduces power consumption by disconnecting the DCP

ISL23328

1 DCP

C serial interface

connected to RLi internally

resistor from the circuit

All other trademarks mentioned are the property of their respective owners

LOGIC

= 1.7V to 5.5V analog power supply

= 1.2V to 5.5V I

REF

RH1

RL1

FIGURE 2. V

and V

RW1

LOGIC

= 5V

REF

C bus/logic power supply

= 1.7V

ADJUSTMENT

ISL28114

= 3.3V

C to +125

REF_M

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