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PDF U2860B-M Data sheet ( Hoja de datos )
| Número de pieza | U2860B-M | |
| Descripción | Dual-Channel FM Sound Demodulator | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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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
1 page  
U2860B-M
Electrical Characteristics
VS = 5 V, Tamb = 25° C, reference point pin , unless otherwise specified
Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
DC Supply (Pin 13)
Supply voltage range
Supply current
Intercarrier Input 1 (Pin 1)
VS 4.5 5.0
IS 27
DC input voltage
Input resistance(1)
Input limiting voltage
Intercarrier Input 2, Pin 14
Input signal vin:
f = 5.5 MHz
output signal AF1:
vAF1 = -3 dB
VDC 1.75
Rin 680
vlim
DC input voltage
Input resistance(1)
Input limiting voltage
Input signal for automatic
second sound carrier mute off
(squelch)
Input signal vin:
f = 5.74 MHz
output signal AF2:
vAF2 = -3 dB
Audio output AF2 active
VDC 1.75
Rin 680
vlim
vin
> 0.7
1.0
FM Demodulators, Internal VCO’s (Pin 10)
Free-running frequency
Oscillator drift (free-running) as
function of temperature
∆T = 55° C
fVCO
∆fVCO
5.5
500
Oscillator shift (free-running)
as function of supply voltage
4.5 V < VS < 5.5 V
∆fVCO
200
Adjustment range of
free-running frequencies
By external resistor Rref at
pin 10
∆fadj
±1
Adjustment resistance for
free-running frequencies
Rref 15 22
FM Demodulators, Internal VCO’s (Pin 10)
Steepness of free-running
frequency adjustment
Resistor Rref at pin 10
S 200
Capture range of PLL’s
Holding range of PLL’s
Audio Outputs, AF1 (Pin 7) and AF2 (Pin 6)
∆fcap
∆fhold
±1.4
±2.0
±1.9
±3.0
DC output voltage
VDC
DC output current
Output resistance(1)
IDC
Rout
AC output peak current
iAC
Note: 1. This parameter is given as an application information and not measured during final testing.
2.2
1.0
150
Max.
Unit
9.0 V
33 mA
V
750 Ω
150 µV
V
750 Ω
150 µV
< 1.5
mV
MHz
kHz
kHz
MHz
30 kΩ
kHz/kΩ
MHz
MHz
-1.3
±1.0
V
mA
Ω
mA
4794A–TVVCR–02/04
5
5 Page 
U2860B-M
Figure 15. Test Circuit
SIF 2
22 nF
50Ω
14
+5 V
22 mF
22 nF
13 12
Cstab
10 µF
11 10
2.2 µF 2.2 µF
98
U2860B-M
SIF 1
1
22 nF
50 Ω
23 456 7
3.3 k Ω
3.3 k Ω
Mute Squelch
15 nF
15 nF
AF2 AF1
Figure 16. Application Circuit
SFE 5.74 MC
680 Ω
14
+5 V
22 µF
10 µF
22 nF
13 12 11
2.2 kΩ
1 kΩ
2.2 µF
2.2 µF
10 9
8
SIF U2860B-M
680 Ω
SFE 5.5 MC
SFE 6.0 MC
1 23456 7
3.3 k Ω
3.3 kΩ
Mute Squelch
15 nF
15 nF
AF2 AF1
4794A–TVVCR–02/04
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet U2860B-M.PDF ] | |
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