ISL54217_09 Datasheet, PDF (9/21 Pages) Intersil Corporation – USB 2.0 High-Speed x 2Channels/Stereo Audio Dual SP3T (Dual 3-to-1 Multiplexer)

ISL54217
Test Circuits and Waveforms (Continued)
AUDIO PRECISION
SYSTEM II CASCADE
ANALYZER
CHA CHB
R_LOAD
R_LOAD
3.3V
C
COM-
COM+
V_DD
L
CLICK
AND
R
POP
GND C0, C1
0V TO V_DD
SQUARE WAVE
Set Audio Analyzer for Peak Detection, 32 Samples/Sec, Aweighted Filter, Manual Range 1X/Y, Units to dBV
FIGURE 9. CLICK AND POP TEST CIRCUIT
Block Diagram
USB
HIGH-SPEED
TRANSCEIVER
#2
AUDIO
CODEC
USB
HIGH-SPEED
TRANSCEIVER
#1
OR
UART
TRANSCEIVER
3.3V
VDD
ISL54217
C0
LOGIC CONTROL
4MΩ ^C1
2D-
COM -
2D+
L _CLICK/
R _POP
1D-
1kΩ
1D+
50kΩ
50kΩ
GND
COM +
µCONTROLLER
V_BUS
Detailed Description
The ISL54217 device consists of dual SP3T (single
pole/triple throw) analog switches. It operates from a single
DC power supply in the range of 2.7V to 4.6V. It was
designed to function as differential 3-to-1 multiplexer to
select between two different USB differential data signals
and audio L and R stereo signals. It comes in a tiny µTQFN
and TQFN packages for use in MP3 players, PDAs, cell
phones, and other personal media players.
9
A device consists of two 2.3Ω audio switches and four 6.2Ω
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 ISL54217 was specifically designed for MP3 players,
personal media players and cellphone applications that need
FN6817.3
May 4, 2009