HA12209F データシートの表示（PDF） - Hitachi -> Renesas Electronics

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HA12209F

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

Hitachi -> Renesas Electronics 

HA12209F

Music Sensor Output (MSOUT)

As for internal circuit of music sensor block, music sensor out 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 = 10k to 22kΩ)

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 C2 and C15.

BIAS1

1

R1

33k

±2%

C15

0.1µ

±10%

39

DET (L)

HA12209

DET (R)

4

C2

0.1µ

±10%

Unit R : Ω

C:F

Figure 7 Tolerance of External Components

Low-Boost

EQIN

CEX2 REX1

CEX4

2.2µ 20k

0.47µ

Vin

REX2 REX3

6.8k 5.1k

+ CEX3

0.47µ

GND

REC EQ

EQOUT

Unit R : Ω

C:F

Figure 8 Example of Low Boost Circuit

Rev.2, Jun. 1999, page 12 of 49

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