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TDA2545A <SIF DEMODULATOR>
TDA2546A
1st Sound IF &
Demodulator
17
18
IF
1
INPUT
2
AGC
TDA9821 <DUAL CHANNEL SOUND DEMODULATOR>
5.5MHz (B/G)
INTERCARRIER
5.74MHz (B/G)
38.9MHz
9
10
REF.
LIMITER
AMP.
AMP.
DEMODU-
LATOR
DEMO.
3
14
TDA9821
7-STAGE
1
LIMITTER
AMPLIFIER 1
15
7-STAGE
LIMITTER
AMPLIFIER 2
SUPPLY
13 14 12 11
VCO
REF
OPTIONAL STEREO
Vp
CHANNEL SEPARATION
ADJUSTMENT
8
FM
DEMO.
LIMITER
AMP.
13
12
5.5MHz
(5.742MHz)
External
FM demodulator
VCO1
VCO2
MUTE
-10-
5.5MHz
(5.742MHz)
7
2nd Sound IF
& FM Demo.
OUTPUT
6
MUTE
4
11
5
Cd
9
8
V
AF1
V
AF2
7
10
F2HT
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