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U4468B PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 U4468B
기능 Quasi-split Sound Circuit and AM Demodulator IC
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U4468B 데이터시트, 핀배열, 회로
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




U4468B pdf, 반도체, 판매, 대치품
Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating
only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Reference point pin 13, unless otherwise specified.
Parameters
Pin Symbol
Value
Unit
Supply voltage range
Supply current
Power dissipation (VS = 9 V)
Output currents
14
14
6, 12
1 - 4, 6, 12
Vs
Is
P
Iout
4.5 to 9.0
55
500
5
+4.5
V
mA
mW
mA
V
External voltages
5, 8, 9
7, 10
Vext
Junction temperature
Tj
Operating temperature range
Tamb
Storage temperature
Electrostatic handling(1)
All
Tstg
VESD
Note: 1. Equivalent to discharging a 200-pF capacitor through a 0-W resistor
+3.5
Vs
+125
0 to +85
-25 to +125
±300
V
V
°C
°C
°C
V
Thermal Resistance
Parameters
Junction ambient when soldered to PCB
Symbol
RthJA
Value
60
Unit
K/W
4 U4468B
4777A–TVVCR–01/04

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U4468B 전자부품, 판매, 대치품
U4468B
Figure 3. Test Circuit
Standard B/G
VS
+5 V
22 µF
SFT 5.74 MA
Rx
680
14
680
1
10 nF
270
500
10 µF
13 12 11 10
2.2 µF 2.2 µF
98
U2860B
234567
SFT 5.5MA
3.3 k
15 nF
3.3 k
15 nF
Intercarrier
frequency
NC
16
Mute Squelch
AF2 AF1
22 µF
VS
+5 V
NC
15 14 13
10 nF
NC
12 11
S2 Mute
10 9
VCO
(38.9 MHz)
U4468B
L1
8.2 pF
33.4 38.9
IF MHz MHz
Standard L
12345678
4.7 µF 4.7 µF 470 nF
150
S1 AGC
(Mean/Peak)
AF (AM)
32.4 MHz
4777A–TVVCR–01/04
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부품번호상세설명 및 기능제조사
U4468B

Quasi-split Sound Circuit and AM Demodulator IC

ATMEL Corporation
ATMEL Corporation

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