HA12163 Datasheet, PDF (17/66 Pages) Hitachi Semiconductor – Audio Signal Processor for Car Deck and Cassette Deck (Dolby B-type NR with PB Amp)

HA12163 Series
4. Input Block Diagram and Level Diagram
R34
5.1 k
R35
5.1 k
R38
330 k
R39
180
R36
12 k
R37
18 k
C25
0.01 µ
C24
0.1 µ
EQ OUT
TAI
30 mVrms
EQ OUT-M ^{(–28.2 dBs)}
HA12163: 300 mVrms (–8.2 dBs)
HA12164: 450 mVrms (–4.7 dBs)
HA12165: 580 mVrms (–2.5 dBs)
HA12160: 550 mVrms (–2.9 dBs)
RAI
42.4 mVrms
(–25.2 dBs)
PBOUT
EQ AMP.
–+
NFI
R_IN
V_REF
0.6 mVrms
(–62.2 dBs)
INPUT AMP.
+
–
NR circuit
RECOUT
300 mVrms
(–8.2 dBs)
F_IN
The each level shown above is typical value
when offering PBOUT level to PBOUT pin.
(EQ AMP Gv = 40 dB f = 1 kHz)
Figure 2 Input Block Diagram
5. Adjustment of Playback Dolby Level
After replace R34 and R35 with a half-fix volume of 10 kΩ, adjust RECOUT level to be Dolby level
with playback mode.
Rev.4, Jun. 1999, page 17 of 66