The ISL22102 integrates two digitally controlled

potentiometers (DCP) with buffered wiper outputs and an

internal bias voltage generator (VB) on a monolithic CMOS

integrated circuit. The wiper position is adjusted by the user

through simple Up and Down push buttons, ideal for stereo

volume control in audio applications.

Each potentiometer is implemented using 31 polysilicon

resistors in a logarithmic array. Between each of the

resistors are tap points connected to the wiper terminal

through switches. When powered up, the wipers are reset to

the -20dB position.

In addition to the ISL22102’s low noise design, the ISL22102

also contains a zero-crossing detection circuitry to further

minimize click and pop noise during volume transition.

The internal VB generator of the ISL22102 provides a

precision middle scale voltage reference that reduces

external circuitry and simplifies application design.

The ISL22102 implements two power saving techniques for

power critical applications. It is a Standby Mode that can be

enabled to reduce the power consumption of the part when

DCP is not in use. The part also has Audio Detection

circuitry that provides an indication FLAG to external devices

and services. The FLAG can be delayed through D0, D1 and

D2 pin configuration. By connecting the FLAG to the standby

pin (SB), it will automatically put the part into Standby Mode.

Features

• Dual Audio Control – Two 32 Taps Log Pots

• Buffered Wiper Outputs

• Audio Detection with Threshold Input and Controlled

Delay

• Zero Amplitude Wiper Switching (ZAWS)

• Simple Push-button Interface

• Auto Increment/decrement After 1s Button Press

• Standby Mode

• Mute Function

• Total Resistance: 18.5k each DCP (Typical)

• Voltage Operation

- VCC = 2.7V to 5.5V

- AVCC = 2.7V to 5.5V

• Temp Range = -40°C to +85°C

• Package Options

- 20 Ld TSSOP

- 20 Ld QFN

• Pb-Free (RoHS Compliant)

Applications

• Set Top Boxes

• Stereo Amplifiers

• DVD Players

• Portable Audio Products