HA12167FB Datasheet, PDF (28/73 Pages) Hitachi Semiconductor – Audio Signal Processor for Cassette Deck (Deck 1 Chip)

HA12167FB/HA12169FB
Gain
g1
3dB
BW
g2
g3
f1 f2
f3
f
Figure 10 REC Equalizer Frequency Response
g1 = ⁹ ₍6.67 × R_GP + ₎ R_GH
RREF
g2
=
9 × RGL
R REF
g3 = ^{9 × RGH}
R REF



 ^{when Gain of EQ - VR is center}



1
f1 = _{2π × 6.67 × 10–10 × RFM}
RGL
f2 = _{2π × 6.67 × 10–10 × RFM × RGH}
1
f3 = _{2 π} ⋅
0.3
2.25 × 10 ^–21× R_FQ × R_F/Q
1
BW =
4π × 2.78 × 10^–10 × R_F/Q
f3
Q = _BW = 3.51×
RF/Q
R_FQ
Rev.3, Jun. 1997, page 28 of 73