TDA4557 Ver la hoja de datos (PDF) - Philips Electronics
Número de pieza
componentes Descripción
Fabricante
TDA4557 Datasheet PDF : 11 Pages
| |||
Philips Semiconductors
Multistandard decoder
Product specification
TDA4557
GENERAL DESCRIPTION
The TDA4557 is a monolithic integrated multistandard
colour decoder for the PAL, SECAM, NTSC 3.58 MHz and
NTSC 4.43 MHz standards.
• Two quadrature demodulators with external reference
tuned circuits (SECAM)
• Internal filtering of residual carrier
• De-emphasis (SECAM)
FEATURES
Chrominance part
• Gain controlled chrominance amplifier for PAL, SECAM
and NTSC
• ACC rectifier circuits (PAL/NTSC, SECAM)
• Burst blanking (PAL) in front of 64 µs glass delay line
• Chrominance output stage for driving the 64 µs glass
delay line (PAL, SECAM)
• Limiter stages for direct and delayed SECAM signal
• SECAM permutator
Demodulator part
• Flyback blanking incorporated in the demodulators
(PAL, NTSC, SECAM)
• PAL switch
• Internal PAL matrix
Identification part
• Automatic standard recognition by sequential inquiry
• Delay for colour-on and scanning-on
• Reliable SECAM identification by PAL priority circuit and
50/60 Hz recognition
• Forced switch-on of a standard
• Four switching voltages for chrominance filters, traps
and crystals
• Two identification circuits for PAL/SECAM (H/2) and
NTSC
• PAL/SECAM flip-flop
• SECAM identification mode switch (horizontal, vertical
or combined horizontal and vertical)
• Crystal oscillator with divider stages and PLL circuitry
(PAL, NTSC) for double colour subcarrier frequency
• HUE control (NTSC)
• Service switch
QUICK REFERENCE DATA
PARAMETER
Supply voltage (pin 13)
Supply current (pin 13)
Chrominance input voltage
(peak-to-peak value)
Chrominance output voltage
(peak-to-peak value)
Colour difference output voltages
(peak-to-peak values)
−(R-Y)
−(B-Y)
Sandcastle pulse (pin 24)
Required amplitude to separate
vertical and horizontal pulse
horizontal pulse
burst gating pulse
SYMBOL
VP
IP
MIN.
TYP.
10.8 12.0
−
65
V15(p-p)
20
100
V12(p-p)
−
1.6
MAX.
13.2
−
UNIT
V
mA
400
mV
−
V
V1(p-p)
V3(p-p)
−
1.05 V ± 2 dB −
V
−
1.33 V ± 2 dB −
V
V24(p-p)
V24(p-p)
V24(p-p)
2.0 2.5
4.1 4.5
7.7 −
3.0
V
4.9
V
VP
V
PACKAGE OUTLINE
28-lead DIL; plastic (SOT117); SOT117-1; 1996 November 27.
March 1991
2
Share Link: 