CXA1980Q

Manufacturer Part NumberCXA1980Q
ManufacturerSony
CXA1980Q datasheet
 
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(3) Adjustment of playback equalizer
R1
C2
2
C1
3
PBFB
300k
300k
PBIN
F
R
Fig. 3
1
Adjustment of EQ curve gain difference (= adjustment of internal variable R)
The internal variable resistor Ri should be adjusted to adjust the EQ curve gain differences (G1-G2),
(G1-G3). Therefore, adjust the external resistor R4 for E IREF pin.
2
AC gain adjustment
External resistor R1
The external resistor R1 should be adjusted to adjust the AC gain. G1 are obtained by the following
equations.
R1+300k
G1=20log
(dB)
R1
[AC gain can be also adjusted by attaching VR to PBOUT pin, fixing R1. However, the low-band cut-
off frequency can be more lowered by R1 adjustment method with the same C1 value used for this
method.]
3
Low-band cut-off frequency
The low-band cut-off frequency (fc) can be determined by the external resistor R1 and external
capacitor C1.
3
PBTC
PBOUT
Ri
fc
E IREF
1
R4
External resistor R1 and external capacitor C1
—12—
CXA1980Q
G1
1
G2
G3
2
Fig. 4
E IREF resistor