CXA1910 SONY [Sony Corporation], CXA1910 Datasheet - Page 13

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CXA1910

Manufacturer Part Number
CXA1910
Description
Dolby B Type Noise Reduction System with Playback Equalizer
Manufacturer
SONY [Sony Corporation]
Datasheet
(3) Adjustment of playback equalizer
1) Adjustment of EQ curve gain difference (= adjustment of internal variable R)
2) AC gain adjustment
3) Low-band cut-off frequency
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.
The external resistor R1 should be adjusted to adjust the AC gain. G3 are obtained by the following
equations.
[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.]
The low-band cut-off frequency (fc) can be determined by the external resistor R1 and external
capacitor C1.
G1=10+20log
R1
F
PBFB
C1
PBIN
R1+300k
Fig. 3
R
R1
External resistor R1
C2
300k
(dB)
PBTC
External resistor R1 and external capacitor C1
E IREF
Ri
R4
PBOUT
1
—13—
3
fc
G1
2
Fig. 4
E IREF resistor
1
G2
G3
CXA1910Q

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