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PDF TDA3840 Data sheet ( Hoja de datos )
| Número de pieza | TDA3840 | |
| Descripción | TV IF Amplifier and Demodulator | |
| Fabricantes | Philips | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TDA3840 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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DATA SHEETwww.DataSheet4U.comINTEGRATED CIRCUITS
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Preliminary specification
File under Integrated Circuits, IC02
www.DataShAeperilt419U9.1com
1 page  
Philips Semiconductors
TV IF amplifier and demodulator with TV
signal identification
Preliminary specification
TDA3840
13. AFC gating, AFC amplifier and AFC switch
With negative modulated video IF signals the output of the
AFC detector is gated by composite sync pulses to prevent
video modulation on the AFC output. The gated signal is
integrated by an AFC capacitor. The AFC amplifier
converts the capacitor voltage to an AFC current (open
collector sink/source output). The AFC function can be
externally switched off for test purposes.
For high-performance signal handling the AFC signal can
be used to track the resonant circuit as shown in Fig.11.
14. Voltage stabilizer
An integrated bandgap voltage stabilizer generates an
internal supply voltage of 4 V. A decoupling capacitor
reduces noise and supply voltage ripple.
April 1991
Fig.3 Internal circuits.
5
5 Page 
Philips Semiconductors
TV IF amplifier and demodulator with TV
signal identification
Preliminary specification
TDA3840
Fig.5 AGC characteristics with different values of R2.
Fig.6 Video waveforms at intercarrier (pin 14) and
buffered video (pin 12) outputs.
Fig.7 Signal-to-noise ratio as a function of IF input
voltage (RMS value) at pins 1 and 20.
SC = sound carrier level; with respect to TOP sync level
CC = chrominance carrier level; with respect to TOP sync level
PC = picture carrier level; with respect to TOP sync level
Sound trap attenuation: 17 dB
Fig.8 Input conditions for intermodulation
measurements.
April 1991
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet TDA3840.PDF ] | |
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