ISL54405_14 Datasheet, PDF (8/20 Pages) Intersil Corporation – CD/MP3 Quality Stereo 2:1 Multiplexer with Click and Pop Elimination

ISL54405
Sound Card AC Coupled Application Block Diagrams
FLOAT 3.3V
LOGIC
µ-CONTROLLER
L
AUDIO
CODEC
R
DIR_SEL
AC/DC
MUTE
SEL
L
5V_Supply VDD
ISL54405
LOGIC
AND
CLICK/POP
CONTROL
R
GND
CAP_SS
SOFT-START
CAPACITOR
0.1µF
L1
L1
FRONT PANEL
L2
LINE OUT
R1
OR
HEADPHONE
R1
JACK
R2
L2
BACK PANEL
LINE OUT
R2
OR
HEADPHONE
JACK
LOGIC
µ-CONTROLLER
FRONT PANEL
L
LINE OUT
OR
HEADPHONE
JACK
R
FLOAT 3.3V
DIR_SEL
AC/DC
MUTE
SEL
L
5V_Supply VDD
ISL54405
LOGIC
AND
CLICK/POP
CONTROL
R
GND
CAP_SS
SOFT-START
CAPACITOR
0.1µF
L1
L1
L2
R1
R1
R2
L2
R2
AUDIO
CODEC
AUDIO
CODEC
Detailed Description
The ISL54405 is a single supply, bidirectional, 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_PEAK
(2V_RMS) ground reference analog signals. The switch r_ON
flatness across this range is extremely small resulting in
excellent THD+N performance (0.0006% with 20k load and
0.0014% with 32 load at 707mV_RMS). The 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.
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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 “Sound Card AC
Coupled Application Block Diagrams” 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.
FN6699.2
May 6, 2014