器件名称: U2860BB
功能描述: Dual-Channel FM Sound Demodulator for TV Systems
文件大小: 417.07KB 共11页
简 介: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 Mute function for both sound channels D 5 V supply voltage, low power consumption D Few external components
Package: DIP14, SO14
D Mono and dual channel application D Sound IF inputs provided for ceramic filters D Automatic mute for 2nd sound channel (squelch)
VS Cstab 13 12 Supply 11 8 7 VAF1
Vin1
1
VCO 1
Loop filter 1
Mute
3 Mute
VCO offset
10
VCO offset Rref (optional)
Vin2
14
VCO 1
Loop filter 2 6 VAF2
Squelch 4 Squelch Squelch (second carrier)
94 8139 e
9
Figure 1. Block diagram
TELEFUNKEN Semiconductors Rev. A1, 17-Jun-96
1 (11)
Preliminary Information
U2860B-B
Circuit Description
The U2860B includes two identical sound IF channels. Each consists of a limiter amplifier, PLL FM demodulator and AF amplifier. Additionally, this circuit contains a squelch function, mute switch and internal voltage regulation.
Audio Amplifiers
The demodulated signals are amplified to 500 mVrms with low output impedance ……
