—13—

CXA1910Q

(3) Adjustment of playback equalizer

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.

R1

C2

C1

PBFB

PBTC

PBOUT

300k

E IREF

R4

1

G1

G2

G3

PBIN

FR

Ri

3

2

1

fc

Fig. 4