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NOISE

DETECT

NOISE

BLANKER

PILOT

CANCEL

INPUT

SELECT

25

26

5

23

24

21

20

22

CDL

CDR

CDCM

TAPEL

TAPER

PHONE

PHCM

FMMPX

7

AM

6

MPXRDS

1

LEVEL

3

4

SCLG

SDAG

10

i.c.

8, 12, 13, 14, 15, 19,

31, 33, 34, 35, 36, 40

AFSAMP

9

AFHOLD

37

38

39

2

RDSGND

MHC328

RDQ

RDDA

RDCL

42

SDA

43

SCL

+

+

+

+

+

+

+

−

−

PILOT/

REFERENCE

PLL

STEREO

DECODER

HIGH

CUT

f: 1.5 to 15 kHz/wide

stereo adjust

roll-off correction

fm/am

NOISE

DETECT

nb sensitivity

usn

sensitivity

level

detection timings

and control

usn

sclg

11

FREF

fref

sdag

USN

MPX

snc start, slope

hcc start, slope

sm start, slope

MULTIPATH/

WEAK SIGNAL

DETECTION

AND LOGIC

SNC

HCC

DETECT

SM

hold

RDS

DEMODULATOR

57 kHz

sclg

write

autogate

INTERFACE

SUPPLY

read

addr

sdag

RDS

PULSE

TIMER

TEF6890H

PULSE

TIMER

amnb

amnb

fmsnc

amfm-

softmute

afu-

mute

asi

asi

asi time

asi active

level/off

pitch

on/off

asi

fmnb

amfmhcc

fmnb

fmsnc

amfm-

hcc

wam

sensitivity

amfm-

softmute

LOUDNESS

input select

0 to

−20 dB

low f: 50/100 Hz

high boost

DE-EMPHASIS

50/75

µs

Vref

standby

44

ADDR

41

DGND

18

CREF

17

AGND

16

VCC

32

NAV

30

RROUT

29

LROUT

28

RFOUT

27

LFOUT

wam

WAM

afus

reset/hold

afumute

Iref

fref

TREBLE

AUDIO STEP INTERPOLATION (asi)

BEEP

+14 to −14 dB

f: 8 to 15 kHz

+14 to −14 dB

f: 60 to 120 Hz

shelve/band-pass

BASS

asi

asi

front/rear

0 to

−59 dB

FRONT/

REAR

FADER

mute:

LF, RF,

LR, RR

mix:

LF, RF,

LR, RR

MUTE

MIX

VOLUME/

BALANCE/

MUTE

vol:

+20 to −59 dB

bal: L/R, 0 to

−79 dB

mute

57 kHz

38 kHz

19 kHz

stereo

DETECT

level

Fig.1 Block diagram.