isl54405 Intersil Corporation, isl54405 Datasheet - Page 8

• Manufacturer Part Number: isl54405
• Description: Cd/mp3 Quality Stereo 2 1 Multiplexer With Click And Pop Elimination
• Manufacturer: Intersil Corporation

Sound Card AC Coupled Application Block Diagrams
Detailed Description
The ISL54405 is a single supply, bi-directional, dual single
pole/double throw (SPDT) ultra low distortion, high
off-isolation analog switch. It was designed to operate from
either a 3.3V or 5V single supply. When operated with a 3.3V
or 5V single supply, the switches can accommodate
±2.83V
switch r
resulting in excellent THD+N performance (0.0006% with
20kΩ load and 0.0014% with 32Ω load at 707mV
T-Type configuration of the switch cells prevents signals
from getting through to the output when a switch is in the
OFF-state providing for superior mute performance
(>120dB) in audio applications.
PEAK
µCONTROLLER
AUDIO
CODEC
ON
µCONTROLLER
FRONT PANEL
HEAD-PHONE
LOGIC
LINE OUT
LOGIC
flatness across this range is extremely small
JACK
(2V
OR
RMS
) ground reference analog signals. The
R
L
L
R
8
R
L
DIR_SEL
AC/DC
MUTE
SEL
R
L
DIR_SEL
AC/DC
MUTE
SEL
RMS
5V_Supply
5V_Supply
FLOAT
). The
FLOAT
CLICK/POP
CLICK/POP
ISL54405
CONTROL
CONTROL
ISL54405
GND
LOGIC
ISL54405
LOGIC
GND
AND
AND
3.3V
3.3V
VDD
VDD
The ISL54405 has special circuitry to eliminate click and
pops in the speakers during power-up and power-down of
the audio CODEC drivers, during removal and insertion of
headphones, and while switching between sources and
loads.
The ISL54405 was designed primarily for consumer and
professional audio switching applications such as computer
sound cards and home theater products. The “Application
Block Diagrams” on this page show two typical sound card
applications. In the upper block diagram the ISL54405 is being
used to route a single stereo source to either the front or back
panel line outs of the computer sound card. In the lower block
diagram the ISL54405 is being used to multiplex two stereo
sources to a single line out of the computer sound card.
CAP_SS
CAP_SS
L1
L2
R1
R2
R2
L1
L2
R1
SOFT-START
CAPACITOR
SOFT-START
CAPACITOR
0.1µF
0.1µF
L1
R1
L2
R2
L1
R1
L2
R2
FRONT PANEL
BACK PANEL
HEAD-PHONE
HEAD-PHONE
LINE OUT
LINE OUT
JACK
JACK
OR
OR
CODEC
CODEC
AUDIO
AUDIO
June 5, 2008
FN6699.1