U4488B Datasheet, PDF (6/9 Pages) TEMIC Semiconductors – Quasi-Split Sound Circuit and AM Demodulator

U4488B
Test Circuit
V_S
+5 V
22 µF
SFT 5.74 MA
Rx
14
680 Ω
10 nF
270 Ω
500 Ω
10 µF
13 12 11 10
2.2 µF 2.2 µF
9
8
U2860B
680 Ω
1
2
3
4
5
6
7
SFT 5.5MA
3.3 kΩ
15 nF
3.3 kΩ
15 nF
Intercarrier
frequency
Standard L
IF2
32.4 MHz
16
Mute Squelch
AF2 AF1
V_S
22 µF ^{+5 V}
10 nF
IF1/IF2 Mute
S3 S2
10 nF
10 nF
15 14 13 12 11 10
9
VCO
(38.9 MHz)
L₁
IF
U4488B
8.2 pF
Standard B/G
1
2
3
4
5
6
7
8
10 nF
IF1
33.4 38.9
MHz MHz
4.7 µF 4.7 µF 470 nF
150 Ω
S1 ^AGC
(Mean/Peak)
AF (AM)
13790
Figure 3.
6 (9)
TELEFUNKEN Semiconductors
Preliminary Information
Rev. A2, 15-Jan-98