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RC5513
PRODUCT SPECIFICATION
2
Functional Description
The Rapper Stereo Sound Driver is an audio device that can
be used on PC motherboards and add-in sound cards. It con-
sists of stereo output drivers for headphone or speakers, a
low noise microphone amplifier with AGC, and a regulator to
provide a clean 5V supply.
The output drivers can deliver up to 2 Watts peak and 4 Watts
peak into 8
W
and 4
W
speakers, respectively, from a 12V
source. The drivers use class AB amplifiers and maintain a
low bias current. To help prevent popping signals a delay is
provided to these output drivers to allow settling. The time
constant is user-defined through an external capacitor
(C
DELAY
) on the SFTSTART pin.
The microphone amplifier feeds into an AGC with a dynamic
range of 40dB. An external capacitor is used to provide
attack and decay features. Attack and decay times can be var-
ied linearly by varying an external capacitor (C
AGCTC pin. The attack and decay time ratio has been set for
pleasant audio quality.
AD
) on the
The 12 V to 5V voltage regulator can provide up to 20mA of
current without external components. It can provide a clean
regulated voltage supply to the other devices that complete
the sound channel. Use of an external transistor can boost the
regulator output to 150mA or higher with the appropriate
thermal precautions. The line regulation of 50dB improves
the cross talk and the power supply rejection ratio of all other
audio blocks that are supplied by the 5V source.
The thermal limiting circuitry activates if the chip tempera-
ture typically exceeds 150
°
C.
Pin Assignments
65-5513-02
LIN
REGSEN
REGOUT
VCC
GNDREG
GNDMIC
MICSEL
AGCTC
MICIN1
MICIN2
RIN
MICOUT
SPKAMPINL
LLINE
SPKMUTE
VCCL
SPKOUTL
GNDSPKL
GNDSPKR
SPKOUTR
SFTSTART
VCCR
RLINE
SPKAMPINR
RC5513
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