QS7785PF 查看數據表（PDF） - Nippon Precision Circuits
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QS7785PF Datasheet PDF : 15 Pages
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QS7785PF/CF
Bass Boost
With a signal input connected to BASC1 and
BASC2, a bass boost function can be implemented.
When BASS is HIGH, resistors RA and RB and
capacitor C are connected to form a lowpass filter.
The lowpass filter signal and the original signal
(RIN, LIN) are combined to boost bass frequencies.
RA=10k
C:0.15µF
RIN
/LIN
37
RB:10k
36
BASC1
/BASC2
R1:20k
R2:20k
To Internal
VREFOUT
Close when BASS=H
Open when BASS=L
Bass boost connection (Gb = 6dB, fC = 300Hz)
.
Gain
Gb
0dB
fL fC fH
( ) Gb=20 log
1+
R1
RA+RB
fC=
1+
R1
RA+RB
2πC
RA RB
RA+RB
( ) fL=fC
−
10
1
2
log
1+
R1
RA+RB
1+2
RA+RB
R1
( ) Freq.
1
fH=fC 10 2
log
1+
R1
RA+RB
1+2
RA+RB
R1
Bass boost frequency response
NIPPON PRECISION CIRCUITS—12
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