HA12216F Datasheet, PDF (11/53 Pages) Hitachi Semiconductor – Audio Signal Processor for Car Deck(Decode only Dolby B type NR with PB Amp.)

HA12216F/HA12221F Series
The Sensitivity Adjustment of Music Sensor
Adjusting MS Amp. gain by external resistor, the sensitivity of music sensor can set up. The music sensor block
diagram is shown in figure 4, and frequency response is shown in figure 5.
CEX2
REX2
V_CC
+^CEX1
REX1
C8
0.01µF
R11
330kΩ
+ _C6
0.33µF
DV_CC
28 _{TAI (L)}
×1
21 20
19 18
MS MS MA MSI
SER REP OUT
17
MS
DET
L⋅R signal
addition circuit
−6dB ₊
−
LPF
25kHz
20dB
90kΩ
−
+
MS
Amp.
×1
TAI (R)
3
DET
100kΩ
MSOUT
15
GND
36
35
R_L
Micro
computer
Figure 4 Music Sensor Block Diagram
G_V2
f₃
f₄
Repeat mode (REP)
G_V1
f₁
f₂
Search mode (SER)
10
100
1k
10k 25k 100k
f (Hz)
Figure 5 Frequency Response
Rev.6.00 Jun 15, 2005 page 11 of 52