8

November 25, 2008

Detailed Description

The ISL54215 device is a dual single pole/double throw

(SPDT) analog switch that operates from a single DC power

supply in the range of 2.5V to 5.0V. It was designed to

function as a dual 2 to 1 multiplexer to select between USB

differential data signals and audio L and R stereo signals. It

comes in tiny µTQFN package for use in MP3 players,

PDAs, cellular phones and other personal media players.

The part consists of two 2.5

Ω audio switches and two 5Ω

USB switches. The audio switches can accept signals that

swing below ground. They were designed to pass audio left

and right stereo signals, that are ground referenced, with

minimal distortion. The USB switches were designed to pass

high-speed USB differential data signals with minimal edge

and phase distortion.

The ISL54215 was specifically designed for MP3 players,

personal media players and cellular phone applications that

need to combine the audio headphone jack and the USB

Typical Application Block Diagrams

FIGURE 8. LOGIC CONTROL VIA MICROPROCESSOR

ISL54215

USB

TRANSCEIVER

HIGH-SPEED

AUDIO

COM -

COM +

IN

GND

D-

D+

R

L

VDD

CTRL

LOGIC CONTROL

µCONTROLLER

4M

Ω

CODEC

3.3V

4M

Ω

ISL54215

USB

TRANSCEIVER

HIGH-SPEED

AUDIO

COM -

COM +

IN

GND

D-

D+

R

L

VDD

CTRL

LOGIC CONTROL

µCONTROLLER

4M

Ω

CODEC

3.3V

4M

Ω

500k

Ω

ISL54215