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PDF ( 数据手册 , 数据表 ) U4488B

零件编号 U4488B
描述 Quasi-Split Sound Circuit and AM Demodulator
制造商 TEMIC Semiconductors
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U4488B 数据手册, 描述, 功能
U4488B
Quasi-Split Sound Circuit and AM Demodulator
Description
The U4488B is an integrated bipolar circuit for full multi-
standard sound IF signal processing in TV/VTR and
Multimedia applications. It supplies AM signals as well
as FM/NICAM sound IF signals and thus allows the de-
sign of a universal sound IF module for various
applications. The U4488B has the same performance like
the U4468B, with the additional feature of a second sym-
metrical IF input.
Features
D 5-V supply voltage; low power consumption
D Gain-controlled 3-stage wideband IF amplifier
D Active carrier generation by FPLL principle
(frequency-phase-locked-loop) for true quadrature
demodulation
Block Diagram
D Complete alignment-free AM demodulator
D Switchable amplitude detector for gain control, which
operates as a peak detector for FM sound and as a
mean level detector for AM sound
D Two symmetrical IF inputs
IFFM
IFAM
IF1/IF2
S3
11
1
2
VS
4 14
REF
IF-Amp
15 IF-Switch
16
Loop
filter
FPLL
5
0° VCO
90°
8
9
VCO
12
Intercarrier
(FM)
Mean
3
AGC
13
Ordering Information
Extended Type Number
U4488B
6
Peak
level
7
IF AGC
Mean/peak
S1
AM-Det
10
Mute S2
Figure 1. Block diagram
AF(AM)
13789
Package
DIP16
Remarks
TELEFUNKEN Semiconductors
Rev. A2, 15-Jan-98
Preliminary Information
1 (9)







U4488B pdf, 数据表
U4488B
Internal Pin Configuration
3 k
8
3 k
9
13801
Figure 10. VCO (Pins 8 and 9)
3.5 V
60 k
11
2.0 V
10 k
13793
Figure 12. IF input switch (Pin 11)
3.5 V
20 k
10
20 k
2.6 V
13802
Figure 11. Mute switch (Pin 10)
Package Information
Package DIP16
Dimensions in mm
20.0 max
12 120
1.4 mA
IDC
13803
Figure 13. Intercarrier output (Pin 12)
7.82
7.42
Alternative
16
1.64 0.58
1.44 0.48
17.78
4.8 max
0.5 min 3.3
2.54
6.4 max
0.39 max
9.75
8.15
9
technical drawings
according to DIN
specifications
13015
18
8 (9) TELEFUNKEN Semiconductors
Preliminary Information
Rev. A2, 15-Jan-98














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