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TDA2545A <SIF DEMODULATOR>
TDA2546A
1st Sound IF &
Demodulator
17
18
IF
1
INPUT
2
TDA9821 <DUAL CHANNEL SOUND DEMODULATOR>
5.5MHz (B/G)
INTERCARRIER
5.74MHz (B/G)
F2JE
9
10
REF.
AMP.
DEMODU-
LATOR
AGC
DEMO.
3
14
TDA9821
7-STAGE
1
LIMITTER
AMPLIFIER 1
15
7-STAGE
LIMITTER
AMPLIFIER 2
SUPPLY
13 14 12 11
VCO
Vp
38.9MHz
LIMITER
AMP.
LIMITER
AMP.
12
5.5MHz
(5.742MHz)
External
FM demodulator
MUTE
REF
OPTIONAL STEREO
CHANNEL SEPARATION
ADJUSTMENT
-11-
5.5MHz
(5.742MHz)
8
7
2nd Sound IF
& FM Demo.
FM
DEMO.
OUTPUT
6
MUTE
4
13
11
5
Cd
9
8
V
VCO1
VCO2
7
10
AF1
V
AF2
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