HA12215 Hitachi Semiconductor, HA12215 Datasheet - Page 13

• Manufacturer Part Number: HA12215
• Description: Audio Signal Processor for Cassette Deck(Dolby B-type NR with Recording System)
• Manufacturer: Hitachi Semiconductor

Music Sensor Output (MSOUT)
Note: Supply voltage of MSOUT pin must be less than V
The Tolerances of External Components
For Dolby NR precision securing, please use external components shown at figure 7. If leak-current are a
few electrolytic-capacitor, it can be applicable to C5 and C23.
Low-Boost
External components shown figure 8 gives frequency response to take 6 dB boost. And cut off frequency
can request it, by C9 (C19).
As for internal circuit of music sensor block, music sensor output pin is connected to the collector of
NPN type directly, output level will be “high” when sensing no signal. And output level will be “low”
when sensing signal.
Connection with microcomputer, it is requested to use external pull up resistor (R
EQIN
Figure 7 Tolerance of External Components
Figure 8 Example of Low Boost Circuit
24.6dB
10%
0.1
4.8k
C5
DET (R)
V
DET (L)
EE
1
HA12215F
42
+
4.8k
BOOST
C9(C19)
0.47
V
C23
0.1
10%
EE
BIAS1
2
CC
R5
33k
REC EQ
2%
voltage.
EQOUT
Rev.5, Oct. 1999, page 13 of 69
L
= 10 k to 22 k )
HA12215F