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U2861B Datasheet, PDF (1/11 Pages) TEMIC Semiconductors – Mono FM Sound Demodulator for TV Systems
U2861B
Mono FM Sound Demodulator for TV Systems
Description
The U2861B is an alignment-free FM sound IF demo-
dulator for all TV standards from 4.5 MHz up to 6.5 MHz
(standard M, N, B/G, I, D/K). The circuit includes two
switchable audio inputs and volume control. With a
supply voltage of 5 V, the U2861B is suitable for TV,
VCR and Multimedia applications.
Features
D Completely alignment-free
D PLL demodulator for FM intercarrier sound IF signals
(mono)
D Two audio switches
D Very few external components
D Volume control by DC voltage
D Supply voltage: 5 V; low power consumption
Sound IF
input 3
vi,SIF
4
GND
AF1in
AF1out
AF2in
VS
VCO
vi,AF1
1
vo,AF1
12
Switch1
5 kW
vi,AF2
10
Cref
VS
6
7
Bandgap
reference
Switch2
8 vo,AF2
AF2out
2
Cdec
5
Vmute
14
Cdem
13
VSW1
11
9
VSW2
Vvol
Decoupling FM De-
Audio
mute emphasis switch1
Figure 1. Block diagram
Audio Volume
switch2 control
96 11832
Ordering Information
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TELEFUNKEN Semiconductors
1 (11)
Rev. A1, 20-May-97
Preliminary Information