QS7785PF Datasheet, PDF (9/15 Pages) Nippon Precision Circuits Inc – 3D 2/4-Channel Stereo Surround Synthesizer

QS7785PF/CF
In output modes 9 to 11, the input stereo signal is
output to the speakers without processing. The
bypass function works for both stereo and mono
input signals, and is used to listen to the original sig-
nals. In mode 9, the stereo signal is output on front
speakers only. In mode 10, the stereo signal is output
Center signal output
on both front and surround speakers. In mode 11, the
stereo signal is output on surround speakers only.
In output mode 12, the input stereo signal is output
on front speakers, and a surround effect enhanced
signal is output on the surround speakers.
Control pins/SDA signal¹
BYP
MONO
SUR
SP
×
×
×
×
×
×
×
×
1. – (dash) = no output signal.
× = indicates don’t care.
1 = HIGH, 0 = LOW
Output signal
AC
COUT
0
–
1
(RIN + LIN) / 2
The center signal is output on COUT. See “Center Control.”
Bass boost mode
Control pins/SDA signal¹
BYP MONO SUR
SP
AC
×
×
×
×
×
×
×
×
×
×
1. × = indicates don’t care.
1 = HIGH, 0 = LOW
BASS
0
1
FROUT/FLOUT
Bass boost OFF
Bass boost ON
Output signal
SROUT/SLOUT
Bass boost OFF
Bass boost ON
COUT
Bass boost OFF
Bass boost ON
The bass boost function is used to enhance the bass frequency component. See “Bass Boost.”
Mute and power save
Control pins/SDA signal¹
BYP MONO SUR SP
AC BASS
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
1. – (dash) = no output signal.
× = indicates don’t care.
1 = HIGH, 0 = LOW
MUTE
0
1
1
PSAVE
0
0
1
FROUT/FLOUT
Available
–
–
Output signal
SROUT/SLOUT
Available
–
–
When PSAVE is HIGH, the analog stages of the
device are turned OFF to save power. When MUTE
is HIGH, all outputs are muted.
COUT
Available
–
–
NIPPON PRECISION CIRCUITS—9