U4488B

Manufacturer Part NumberU4488B
ManufacturerATMEL Corporation
U4488B datasheet
 


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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-
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
IF1/IF2
S3
11
1
IF
FM
2
15
IF-Switch
IF
AM
16
3
AGC
13
Ordering Information
Extended Type Number
U4488B
Rev. A3, 08–Mar–01
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.
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
V
S
Loop
filter
4
14
REF
FPLL
IF-Amp
Mean
AM-Det
Peak
level
7
IF AGC
S1
Mean/peak
Figure 1. Block diagram
Package
DIP16
Preliminary Information
U4488B
5
VCO
8
0
VCO
90
9
12
Intercarrier
(FM)
6
AF(AM)
10
Mute
S2
13789
Remarks
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U4488B Summary of contents