ISL54206A_1010 Datasheet, PDF (9/20 Pages) Intersil Corporation – MP3/USB 2.0 High Speed Switch with Negative Signal Handling

ISL54206A
Application Block Diagrams
VBUS
IN
COM-
COM+
VDD
ISL54206A
LOGIC
4MΩ
CTRL
D-
D+
50kΩ L
R
50kΩ
µCONTROLLER
USB
HIGH-SPEED
TRANSCEIVER
CODEC
GND
LOGIC CONTROL VIA MICRO-PROCESSOR
VBUS
22kΩ
IN
4MΩ
COM-
COM+
VDD
ISL54206A
LOGIC
4MΩ
CTRL
D-
D+
50kΩ L
R
50kΩ
µCONTROLLER
USB
HIGH-SPEED
TRANSCEIVER
CODEC
GND
LOGIC CONTROL VIA VBUS VOLTAGE FROM COMPUTER OR USB HUB
Detailed Description
The ISL54206A device is a dual single pole/double throw
(SPDT) analog switch device that can operate from a
single DC power supply in the range of 2.5V to 5.5V. 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, cell phones, and
other personal media players.
The part consists of two 3Ω 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 ISL54206A was specifically designed for MP3
players, cell phones and other personal media player
applications that need to combine the audio headphone
jack and the USB data connector into a single shared
connector, thereby saving space and component cost.
Typical application block diagrams of this functionality is
shown above.
The ISL54206A has a single logic control pin (IN) that
selects between the audio switches and the USB
switches. This pin can be driven Low or High to switch
between the audio CODEC drivers and USB transceiver of
the MP3 player or cellphone. The ISL54206A also
contains a logic control pin (CTRL) that when driven Low
while IN is Low, opens all switches and puts the part into
a low power state, drawing typically 1nA of I_DD current.
A detailed description of the two types of switches is
provided in the following sections. The USB transmission
and audio playback are intended to be mutually exclusive
operations.
9
FN6515.3
October 28, 2010