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PDF U4468B Data sheet ( Hoja de datos )
| Número de pieza | U4468B | |
| Descripción | Quasi-split Sound Circuit and AM Demodulator IC | |
| Fabricantes | ATMEL Corporation | |
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Features
• 5-V Supply Voltage
• Gain-controlled 3-stage Wide-band IF Amplifier
• Active Carrier Generation by FPLL Principle (Frequency-Phase-Locked-Loop) for True
Quadrature Demodulation
• Complete Alignment-free AM Demodulator
• Switchable Amplitude Detector for Gain Control, which Operates as a Peak Detector for
FM Sound and as a Mean Level Detector for AM Sound
Description
The U4468B is an integrated bipolar circuit for full multistandard sound IF signal pro-
cessing in TV/VTR and multimedia applications. It supplies AM signals as well as
FM/NICAM sound IF signals and thus allows the design of a universal sound IF mod-
ule for various applications.
Quasi-split
Sound Circuit
and AM
Demodulator IC
Figure 1. Block Diagram
U4468B
IFFM
IFAM
VS
4 14
2 IF-amp
1
REF
Loop
filter
FPLL
5
8
05
905 VCO 9
VCO
12
Intercarrier
(FM)
3
AGC
Mean
Peak
level
13
7
IF AGC
Mean/peak
S1
AM-det
6
AF (AM)
10
Mute S2
Rev. 4777A–TVVCR–01/04
1 page  
U4468B
Electrical Characteristics
VS = +5 V, Tamb = +25°C; reference point pin 13, unless otherwise specified.
Parameters
Test Conditions
Symbol
Min.
Typ.
Max.
Unit
DC Supply (Pin 14)
Supply voltage
Supply current
IF Input (Pins 1, 2)
Vin =10 mV or V3 = 2 V
VS
4.5 5.0 9.0
V
IS 40 mA
Minimum IF input signal
Maximum IF input signal
Input impedance
Input capacitance
SIF-AGC (Pin 3)
Output signal: -3 dB
Output signal: +1 dB
(1)
(1)
vin 50
vin 70 100
Rin 1.2
Cin 2
µVrms
mVrms
kW
pF
IF gain control range
AGC capacitor
FPLL and VCO (Pins 5, 8, and 9)
Gv
CAGC
60 65
4.7
dB
µF
Maximum oscillator frequency
Vision carrier capture range
Oscillator drift (free running) as
function of temperature
Standard Switch (Pin 7)
For carrier generation
fVCO = 38.9 MHz
CVCO = 6.2 pF
DTamb = 55°C,
fVCO = 38.9 MHz
CVCO = 6.2 pF(2)
fVCO
Dfcap
70
±1.5
±2
MHz
MHz
Df/DT
-0.3 %
Switching voltage for mode 1:
FM/NICAM sound
Peak value control(3)
Vsw1
2.0
VS V
Switching voltage for mode 2:
AM sound
Average level control
Vsw2
0
1.5 V
Switching current
AM Mute Switch (Pin 10)
Isw
±100
µA
Switching voltage
Switching voltage
Switching current
Intercarrier Output (Pin 12)(4)
AM output active
AM output switched off
Vmute1
Vmute2
Imute
open
0 1.5 V
-100 µA
DC output voltage
Output resistance
Intercarrier output signal
(1)
vin = 10 mV
5.5 MHz output signal
VDC 2 V
Rout 200 W
Vout 100 150
mVrms
Intercarrier bandwidth
-1 dB
-3 dB
B
TBD
TBD
MHz
MHz
Notes:
1. This parameter is given as an application information and is not tested during production.
2. The oscillator drift is related to the picture carrier frequency, with an external temperature-compensated LC circuit.
3. Without external control voltage (pin 7 open), the IC automatically operates in mode 1.
4. Picture carrier PC = 38.9 MHz; sound carrier SC1 = 33.4 MHz, SC2 = 33.16 MHz;
PC/SC1 =13 dB; PC/SC2 = 20 dB; PC unmodulated (equivalent to sync peak level).
5. Sound carrier SC = 32.4 MHz, modulated with fmod = 1 kHz, m = 54%; vin = 10 mV.
4777A–TVVCR–01/04
5
5 Page 
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Printed on recycled paper.
4777A–TVVCR–01/04
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| PDF Descargar | [ Datasheet U4468B.PDF ] | |
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