HA12203NT データシートの表示（PDF） - Hitachi -> Renesas Electronics

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HA12203NT

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

Hitachi -> Renesas Electronics 

HA12203NT/HA12204NT

The Sensitivity Adjustment of Music Sensor

Adjusting MS Amp gain by external resistor, the sensitivity of music sensor can set up.

REP

PB (L)

–6dB

VCC

C17 R18

1000p 330k

+ C16

0.33µ

D VCC

8.2k

LPF

25kHz

MAI

MA MSIN MS

RL

100k

OUT

DET

–

+

MS AMP

DET

50k

MS OUT

GND

Microcomputer

GND

PB (R)

Figure 4 Music Sensor Block Diagram

The Sensitivity of Music Sensor

Gv

f1 =

1

[Hz]

2π • C17 • 50k

f2 = 25k [Hz]

f

f1

f2

Figure 5 Frequency Characteristic of MSIN

Occasion of the external component of figure 4, f1 is 3.18 kHz.

Rev.3, Jun. 1999, page 12 of 97

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