ISL54215 Datasheet, PDF (8/15 Pages) Intersil Corporation – MP3/USB 2.0 High Speed Switch with Negative Signal Handling and Low Power Shutdown

ISL54215
Typical Application Block Diagrams
3.3V
V_BUS
VDD
ISL54215
IN
LOGIC CONTROL
4MΩ
COM -
COM +
CTRL
4MΩ
D-
D+
L
R
GND
µCONTROLLER
USB
HIGH-SPEED
TRANSCEIVER
AUDIO
CODEC
FIGURE 8. LOGIC CONTROL VIA MICROPROCESSOR
3.3V
V_BUS
500kΩ
VDD
ISL54215
IN
LOGIC CONTROL
4MΩ
COM -
COM +
CTRL
4MΩ
D-
D+
L
R
GND
µCONTROLLER
USB
HIGH-SPEED
TRANSCEIVER
AUDIO
CODEC
FIGURE 9. LOGIC CONTROL VIA V_BUS VOLTAGE FROM COMPUTER OR USB HUB
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 2.5Ω 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
8
November 25, 2008