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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

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

IF1/IF2

S3

11

1

2

IF-Amp

12

Intercarrier

(FM)

4

14

REF

FPLL

V

S

Loop

filter

5

0擄

90擄

VCO

9

8

VCO

IF

FM

IF

AM

15

16

IF-Switch

Mean

3

AGC

Peak

level

13

IF AGC

Mean/peak

7

S1

Mute

AM-Det

6

AF(AM)

10

S2

13789

Figure 1. Block diagram

Ordering Information

Extended Type Number

U4488B

Package

DIP16

Remarks

TELEFUNKEN Semiconductors

Rev. A2, 15-Jan-98

1 (9)

Preliminary Information

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U4488B相關(guān)型號PDF文件下載

• 型號
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  描述
  廠商
  下載
• U448B
  英文版
  Telecommunication IC
  ETC
  U448B
• U448B
  英文版
  Telecommunication IC
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• U4488B
  英文版
  Quasi-Split Sound Circuit and AM Demodulator
  TEMIC
  U4488B
• U4488B
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  Quasi-Split Sound Circuit and AM Demodulator
  TEMIC [TEM...
  U4488B
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  英文版
  QSS + AM demodulator 
  U4488B 

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