U4468B ATMEL Corporation, U4468B Datasheet - Page 7

• Manufacturer Part Number: U4468B
• Description: Quasi-split Sound Circuit And Am Demodulator Ic
• Manufacturer: ATMEL Corporation

Figure 3. Test Circuit
4777A–TVVCR–01/04
IF
MHz
Standard B/G
33.4
Standard L
32.4 MHz
MHz
38.9
Intercarrier
frequency
680 Ω
680 Ω
Rx
SFT 5.74 MA
NC
16
1
SFT 5.5MA
NC
14
15
1
2
22 µF
4.7 µF 4.7 µF
+5 V
V
S
13
14
2
3
10 nF
+5 V
22 µF
V
S
Mute
U4468B
12
13
4
3
470 nF
U2860B
Squelch
11
12
4
5
150 Ω
10 µF
10 nF
15 nF
NC
10
11
5
6
3.3 kΩ
270 Ω
AF (AM)
S2
S
AF2
1
10
9
6
7
2.2 µF
Mute
AGC
(Mean/Peak)
AF1
8
7
9
8
2.2 µF
500 Ω
3.3 kΩ
L
(38.9 MHz)
1
15 nF
8.2 pF
VCO
U4468B
7