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U2860B-M

Dual-Channel FM Sound Demodulator



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U2860B-M pdf
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
13
Cstab
12 11
Supply
Vin1 1
VCO 1
Loop
filter 1
Mute
3
Mute
VCO
offset
Vin2 14
VCO 1
Loop
filter 2
Squelch
4
Squelch
Squelch (second carrier)
8
7 VAF1
10 VCO offset
Rref
(optional)
6 VAF2
9
Rev. 4794A–TVVCR–02/04



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U2860B-M pdf
Pin Configuration
Figure 2. Pinning
Vin1
NC
Vmute
Vsque
NC
VAF2
VAF1
1
2
3
4
5
6
7
14 Vin2
13 VS
12 GND
11 Cstab
10 Rref
9 C9
8 C8
Pin Description
Pin Symbol
1 Vin1
2 NC
3 Vmute
4 Vsque
5 NC
6 VAF2
7 VAF1
8 C8
9 C9
10 Rref
11 Cstab
12 GND
13 VS
14 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
Audio output AF2 of sound channel 2
Audio output AF1 of sound channel 1
Decoupling capacitor for sound channel 1
Decoupling capacitor for sound channel 2
VCO offset of the free-running frequency
Internal supply voltage stabilization
Ground
Supply voltage
Intercarrier input of sound channel 2 (5.74 MHz)
2 U2860B-M
4794A–TVVCR–02/04



Part Number U2860B-M
Description Dual-Channel FM Sound Demodulator
Maker Atmel - Atmel
Total Page 14 Pages
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