CXA1910Q
(3) Adjustment of playback equalizer
R1
C2
C1
3
G1
PBFB
PBTC
Ri
PBOUT
1
G2
G3
300k
2
fc
Fig. 4
E IREF
PBIN
1
F
R
R4
Fig. 3
1) Adjustment of EQ curve gain difference (= adjustment of internal variable R) → E IREF resistor
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. G3 are obtained by the following
equations.
R1+300k
G1=10+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 → External resistor R1 and external capacitor C1
The low-band cut-off frequency (fc) can be determined by the external resistor R1 and external
capacitor C1.
—13—
SONY [ SONY CORPORATION ]
