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ISL54406IRTZ-T 数据表(PDF) 10 Page - Intersil Corporation

部件名 ISL54406IRTZ-T
功能描述  Stereo Click and Pop Eliminator with Audio Muting
Download  16 Pages
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制造商  INTERSIL [Intersil Corporation]
网页  http://www.intersil.com/cda/home
标志 INTERSIL - Intersil Corporation

ISL54406IRTZ-T 数据表(HTML) 10 Page - Intersil Corporation

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ISL54406
10
FN6578.1
July 14, 2010
Audio Playback Mode
If the SEL1 and SEL2 pins are Logic “1”, the device will be
in the Audio Playback mode. In Audio Playback mode the
LIN (left) and RIN (right) 2.5Ω audio switches are
connected to LOUT and ROUT respectively, and the audio
Click and Pop circuitry is inactive (high impedance).
When headphones are connected to the LOUT and ROUT
outputs of the ISL54406, the audio source drives the
headphones with low distortion audio.
Audio Mute Mode
If SEL1 is Logic “0” and SEL2 is Logic “1”, the device will
be in the Audio Mute Mode. In Audio Mute Mode the
audio switches are OFF (high impedance), the audio Click
and Pop shunt circuitry is OFF (high impedance), and the
LOUT and ROUT pins are shorted through 6Ω resistors to
ground. Off Isolation performance in Audio Mute Mode
gives a 110 dB signal reduction across a 32Ω load when
driving with a 0.707VRMS signal at the switch input.
Click and Pop Mode
Note: Click and Pop Mode should not be used for audio
muting applications. In Click and Pop Mode, a low
impedance (35Ω) path to ground at the LIN/RIN inputs
will degrade Off Isolation performance (see Figure 14).
If SEL1 is Logic “1” and SEL2 is Logic “0”, the device will
go into Click and Pop Mode. This mode is optimal when
powering up or down the audio sources. In Click and Pop
Mode the audio in-line 2.5Ω switches are OFF (high
impedance). The LOUT and ROUT pins are shorted
through 6Ω resistors to ground and the LIN and RIN are
shunted through 35Ω resistors to ground (Click and Pop
circuitry is active).
Before powering down or powering up of the audio
source drivers, the ISL54406 should be put in the Click
and Pop Mode. In Click and Pop Mode, transients
generated at the LIN and RIN pins due to a DC step
voltage at the audio drivers will not pass through the
ISL54406 audio switches, preventing Click and Pop noise
to the load.
Shutdown Mode
If SEL1 and SEL2 pins are Logic “0”, the device will enter
a low powered Shutdown (SHDN) Mode. In SHDN, the
audio switches are OFF, the 6Ω path is high impedance,
the Click and Pop circuitry is inactive, and the device will
draw a typical supply current of 5nA.
Note: When the logic inputs are floated, the ISL54406
will automatically be placed in SHDN mode due to the
internal 4MΩ pull down resistors on the logic pins.
Note: In Shutdown Mode, the Off-Isolation of the audio
switch degrades in performance compared to Audio Mute
Mode. In SHDN, the negative charge pumps that permit
the signal to swing below ground are turned off to reduce
power consumption, thus any negative signal swing at
the LIN and RIN will appear at the LOUT and ROUT pins.
The device should not be placed into SHDN when the
source is still active or for high Off-Isolation performance.
CLICK AND POP OPERATION
Single supply audio sources are biased at a DC offset
that generates transients during power on/off of the
source. This DC transient is coupled into the load through
a blocking capacitor (see “Application Block Diagram” on
page 9). When the source is off and suddenly turned on
with a DC offset, the capacitor will develop a voltage
across it that is equal to the DC offset. If the switch is in
Audio mode when this occurs, a transient discharge will
occur in the speaker, generating a Click and Pop noise.
Proper elimination of Click and Pop transients requires
that the ISL54406 be placed in Click and Pop Mode
before the audio source is turned on or off. This allows
any transients generated by the source to be discharged
through the Click and Pop circuitry first. With a typical DC
blocking capacitor of 220µF and the Click and Pop
circuitry designed to have a resistance of 35Ω, allowing a
100ms dead-time for discharging a transient before
placing the switch in Audio mode will eliminate the DC
transient generated by the blocking capacitor.
Note: The ISL54406 should not be brought into Audio
Playback Mode directly from Shutdown Mode and vice
versa. A DC transient may occur at the LOUT/ROUT pins
when brought from Shutdown directly to Audio Playback
mode. The recommended procedure is to place the
ISL54406 into Mute mode for at least 100ms when
entering or leaving Audio Playback mode.
Power supply considerations
The power supply connected at VDD and GND provides
power to the ISL54406 part. In a typical application VDD
will be in the range of +2.7V to +5.0V and will be
connected to the battery or LDO of the MP3 player or
cellphone. A 0.1µF local decoupling capacitor should be
placed near the VDD pin of the IC to eliminate power
supply transients.
Before power-up and power-down of the ISL54406 part,
the SEL1 and SEL2 logic control pins should be driven to
Logic “0” or left floating. In a high impedance state, 4MΩ
internal pull down resistors on the SEL1 and SEL2 pins
will set the ISL54406 logic pins to “0”. This will put the
switch in the SHDN state which turns all switches OFF
and deactivates the Click and Pop circuitry which will
minimize power supply currents and increase battery life.


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