HA12215 Просмотр технического описания (PDF) - Hitachi -> Renesas Electronics

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HA12215

Audio Signal Processor for Cassette Deck (Dolby B-type NR with Recording System)

Hitachi -> Renesas Electronics 

HA12215F

Music Sensor Output (MSOUT)

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 (RL = 10 kΩ to 22 kΩ)

Note: Supply voltage of MSOUT pin must be less than VCC voltage.

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.

VEE C23

0.1µ

±10%

42

DET (L)

HA12215F

Low-Boost

DET (R) BIAS1

1

2

C5

0.1µ

±10%

R5

33k

VEE ±2%

Figure 7 Tolerance of External Components

24.6dB

EQIN

4.8k

REC EQ

4.8k

EQOUT

BOOST

+C9(C19)

0.47µ

Figure 8 Example of Low Boost Circuit

External components shown figure 8 gives frequency response to take 6 dB boost. And cut off frequency

can request it, by C9 (C19).

Rev.5, Oct. 1999, page 13 of 69

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