HA12229F View Datasheet(PDF) - Hitachi -> Renesas Electronics

Part Name

Description

Manufacturer

HA12229F

Audio Signal Processor for Car Deck (Decode only Dolby B-type NR* with PB Amp.)

Hitachi -> Renesas Electronics 

HA12228F/HA12229F

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

VCC

+CEX1

REX1

C8

0.01µF

R11

330kΩ

+ C6

0.33µF

DVCC

TAI(R)

×1

MS MS MA MSI

SER REP OUT

MS

DET

−6dB

L/R signal

addition

+

−

LPF

25kHz

20dB

×1

TAI(L)

90kΩ

−

+

MS

Amp.

DET

100kΩ

MSOUT

GND

IL

RL

Micro

computer

Note: The impedance of MSI is 100kΩ.

Figure 4 Music Sensor Block Diagram

GV2

f3

f4

Repeat mode

GV1

f1

f2

Search mode

10

100

1k

10k 25k 100k

f (Hz)

Figure 5 Frequency Response

Rev.2, Dec. 2000, page 13 of 51

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