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零件编号 | U4488B | ||
描述 | Quasi-Split Sound Circuit and AM Demodulator | ||
制造商 | TEMIC Semiconductors | ||
LOGO | |||
1 Page
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
Internal Pin Configuration
3 kΩ
8
3 kΩ
9
13801
Figure 10. VCO (Pins 8 and 9)
3.5 V
60 kΩ
11
2.0 V
10 kΩ
13793
Figure 12. IF input switch (Pin 11)
3.5 V
20 kΩ
10
20 kΩ
2.6 V
13802
Figure 11. Mute switch (Pin 10)
Package Information
Package DIP16
Dimensions in mm
20.0 max
12 120 Ω
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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页数 | 9 页 | ||
下载 | [ U4488B.PDF 数据手册 ] |
零件编号 | 描述 | 制造商 |
U4488B | Quasi-Split Sound Circuit and AM Demodulator | TEMIC Semiconductors |
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