器件名称: U2860B-MFPG3
功能描述: Dual-Channel FM Sound Demodulator for TV Systems
文件大小: 336.16KB 共14页
简 介:Features
Two Alignment-free PLL FM Demodulators, Automatic Lock-in on the Received Sound
Carrier Frequency Mono and Dual Channel Application Sound IF Inputs Provided for Ceramic Filters Automatic Mute for Second Sound Channel (Squelch) Mute Function for Both Sound Channels 5-V Supply Voltage, Low-power Consumption Few External Components
Description
The U2860B-M is a dual-channel FM sound demodulator realized with Atmel ’s advanced bipolar process. All TV FM standards, from 4.5 MHz 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-M is suitable for TV, VCR and multimedia applications.
Dual-Channel FM Sound Demodulator for TV Systems U2860B-M
Figure 1. Block Diagram
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) 9
Rev. 4794A–TVVCR–02/04
Pin Configuration
Figure 2. Pinning
Vin1 NC Vmute Vsque NC VAF2 VAF1 1 2 3 4 5 6 7 14 13 12 11 10 9 8 Vin2 VS GND Cstab Rref C9 C8
Pin Description
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Symbol Vin1 NC Vmute Vsque NC VAF2 VAF1 C8 C9 Rref Cstab GND VS Vin2 Function Intercarrier input of sound channel 1 (5.5 MHz) Not connected Mute for sound channel 1+2 “on/off” Automatic mute for 2nd sound channel (squelch) “on/off” Not connected Aud……