U4468B

Manufacturer Part NumberU4468B
DescriptionQuasi-split Sound Circuit And Am Demodulator Ic
ManufacturerATMEL Corporation
U4468B datasheet
 
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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.
Figure 1. Block Diagram
IF
FM
IF-amp
2
1
IF
AM
3
AGC
13
V
Loop
S
filter
4
14
5
05
REF
FPLL
905
Mean
AM-det
Peak
level
7
IF AGC
S
Mute
Mean/peak
1
Quasi-split
Sound Circuit
and AM
Demodulator IC
U4468B
VCO
8
VCO
9
12
Intercarrier
(FM)
6
AF (AM)
10
S
2
Rev. 4777A–TVVCR–01/04

U4468B Summary of contents

  • Page 1

    ... 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 ...

  • Page 2

    ... AM Demodulator Quasi-Split-Sound (QSS) Mixer Mute Switch U4468B 2 The symmetrical IF input signal from the external SAW filter is fed to the pins 1 and 2. In case of FM/NICAM applications, a SAW filter with double band-pass characteristic is required for the vision and sound carrier. In case of the L-standard, a band-pass filter with the center frequency at the L-sound carrier is used ...

  • Page 3

    ... VCO circuit 10 VSW,MUTE Mute switch 12 VO,FM Intercarrier output (FM sound) 13 GND Ground 14 VS Supply voltage (5 V) 11, 15 Not connected 4777A–TVVCR–01/04 VIIF VIIF 3 14 CAGC 4 13 CREF U4468B VO, VSW,AGC 8 9 VVCO GND VO,FM NC VSW,MUTE VVCO U4468B 3 ...

  • Page 4

    ... S Output currents External voltages Junction temperature Operating temperature range Storage temperature (1) Electrostatic handling Note: 1. Equivalent to discharging a 200-pF capacitor through a 0-W resistor Thermal Resistance Parameters Junction ambient when soldered to PCB U4468B 4 Pin Symbol out V ext ...

  • Page 5

    ... V 0 sw2 I ±100 sw V open mute1 V 0 mute2 I -100 mute out V 100 150 out TBD B TBD = 33.16 MHz mV. in U4468B Max. Unit 9 µV rms mV rms µF MHz MHz -0 1.5 V µA 1.5 V µ 200 mV rms MHz ...

  • Page 6

    ... 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 SC PC/SC =13 dB; PC/ Sound carrier SC = 32.4 MHz, modulated with f U4468B 6 Test Conditions B/G mod. VIF signal deviation = ±27 kHz ...

  • Page 7

    ... U4468B 4.7 µF 4.7 µF 470 nF 270 Ω 500 Ω 10 µF 2.2 µF 2.2 µ 3.3 kΩ 3.3 kΩ AF2 AF1 10 nF VCO Mute S2 (38.9 MHz 8 AGC 1 (Mean/Peak) 150 Ω AF (AM) U4468B 7 ...

  • Page 8

    ... Internal Pin Configuration U4468B 8 Figure 4. Sound IF Inputs (Pins 1 and 2) 2 kΩ Figure 5. AGC Time Constant (Pin 3) 3 Figure 6. Internal Reference Voltage (Pin 4) 4 Figure 7. Loop Filter (Pin kΩ 10 kΩ 2 kΩ 4.25 V 3.5 V 2.75 V 4777A–TVVCR–01/04 ...

  • Page 9

    ... Figure 8. AM Output (Pin 6) 1. 100 Ω Figure 9. AGC Switch (Pin 7) 7 Figure 10. VCO (Pins 8 and 9) 3 kΩ 8 Figure 11. Mute Switch (Pin 10) 20 kΩ kΩ IDC 3 kΩ 15.5 kΩ 23 kΩ 3 kΩ 9 3.5 V 2.6 V U4468B 9 ...

  • Page 10

    ... Ordering Information Extended Type Number U4468B Package Information Package DIP16 Dimensions in mm Alternative U4468B 10 Figure 12. Intercarrier Output (Pin 12) 12 1.4 mA Package DIP16 20.0 max 1.64 0.58 2.54 1.44 0.48 17. 120 Ω IDC Remarks – 7.82 7.42 4.8 max 6.4 max 3.3 0.5 min 0.39 max 9.75 8.15 technical drawings according to DIN specifications 4777A–TVVCR–01/04 ...

  • Page 11

    ... Fax: (81) 3-3523-7581 Disclaimer: Atmel Corporation makes no warranty for the use of its products, other than those expressly contained in the Company’s standard warranty which is detailed in Atmel’s Terms and Conditions located on the Company’s web site. The Company assumes no responsibility for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without notice, and does not make any commitment to update the information contained herein ...

  • Page 12

    ... This datasheet has been download from: www.datasheetcatalog.com Datasheets for electronics components. ...