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參數(shù)資料
| 型號(hào)： | U4488B |
| 英文描述： | Quasi-Split Sound Circuit and AM Demodulator |
| 中文描述： | 準(zhǔn)分離聲音電路和AM解調(diào)器 |
| 文件頁(yè)數(shù)： | 1/9頁(yè) |
| 文件大小： | 272K |
| 代理商： | U4488B |
U4488B
Preliminary Information
TELEFUNKEN Semiconductors
Rev. A2, 15-Jan-98
1 (9)
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
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
Block Diagram
Mean
FPLL
VCO
8
9
12
AM-Det
6
Peak
level
IF-Amp
1
2
REF
14
4
V
S
5
Loop
filter
VCO
7
13
10
3
IF AGC
Mean/peak
S1
S2
Mute
Intercarrier
(FM)
AF(AM)
AGC
IF
FM
IF
AM
13789
15
16
IF-Switch
11
S3
IF1/IF2
0
°
90
°
Figure 1. Block diagram
Ordering Information
Extended Type Number
Package
Remarks
U4488B
DIP16
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