U2860BB Datasheet, PDF (1/11 Pages) TEMIC Semiconductors – Dual-Channel FM Sound Demodulator for TV Systems

U2860B-B
Dual-Channel FM Sound Demodulator for TV Systems
Description
The U2860B is a dual-channel FM sound demodulator
realized with TEMIC’s advanced bipolar process. All TV
FM standards, from 4.5 up to 6.5 MHz (standard M, B/G,
I, D/K) can be processed with high performance. The
circuit is alignment-free and has a minimum number of
external components. With 5 V supply voltage, the
U2860B is suitable for TV, VCR and multimedia
applications.
Features
D Two alignment-free PLL FM demodulators,
automatic lock in on the received sound carrier
frequency
D Mono and dual channel application
D Sound IF inputs provided for ceramic filters
D Automatic mute for 2nd sound channel (squelch)
D Mute function for both sound channels
D 5 V supply voltage, low power consumption
D Few external components
Package: DIP14, SO14
V_S
C_stab
13
12 11
Supply
V_in1
1
VCO 1
Loop
filter 1
8
7
V_AF1
Mute 3
Mute
VCO
offset
V_in2
14
VCO 1
Loop
filter 2
Squelch 4
Squelch
Squelch (second carrier)
94 8139 e
10 _{VCO offset}
R_ref
(optional)
6
V_AF2
9
Figure 1. Block diagram
TELEFUNKEN Semiconductors
1 (11)
Rev. A1, 17-Jun-96
Preliminary Information