isl54209 Intersil Corporation, isl54209 Datasheet - Page 8

• Manufacturer Part Number: isl54209
• Description: Mp3/usb 2.0 High Speed Switch With Negative Signal Handling And Low Power Shutdown
• Manufacturer: Intersil Corporation

Application Block Diagrams
Detailed Description
The ISL54209 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 and TDFN packages for use in MP3
players, PDAs, cellular phones and other personal media
players.
V
FIGURE 9. LOGIC CONTROL VIA V
BUS
V
BUS
8
FIGURE 8. LOGIC CONTROL VIA MICRO-PROCESSOR
COM -
COM +
IN
IN
COM -
COM +
4MΩ
4MΩ
LOGIC CONTROL
LOGIC CONTROL
3.3V
GND
3.3V
ISL54209
GND
ISL54209
VDD
VDD
ISL54209
BUS
50kΩ
50kΩ
VOLTAGE FROM COMPUTER OR USB HUB
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 ISL54209 was specifically designed for MP3 players,
personal media players and cellular phone applications that
need to combine the audio headphone jack and the USB
4MΩ
50kΩ
4MΩ
CTRL
CTRL
50kΩ
D-
D+
L
R
D-
D+
L
R
µCONTROLLER
TRANSCEIVER
HIGH-SPEED
μCONTROLLER
TRANSCEIVER
HIGH-SPEED
CODEC
AUDIO
CODEC
USB
AUDIO
USB
December 20, 2007
FN6627.0