Tuner HF-MOD.OS.OPT.FS.5,6 MHz RF-IF Module Os. 5829 01 18
HF-MOD.OS.OPT.FS.5,6 MHz RF-IF Module Os. 5829 01 18
Details:
TDA5030A OSC + Mixer
TDA2556 Stereo IF AMP - Demod
TDA4427A VIF VIDEO IF AMPL - Demod
U664B Prescaler
OFW G 3251 SAW Filter.
TDA2556 QUASI-SPLIT-SOUND CIRCUIT WITH DUAL SOUND DEMODULATORS
GENERAL DESCRIPTION
The TDA2556 is a monolithic integrated circuit for quasi-split-sound processing, including two FM
demodulators, for two carrier stereo TV receivers and VTR.
Features
First IF (vision carrier plus sound carrier).
0 3 stage gain controlled IF amplifier
0 AGC circuit
0 Reference amplifier and limiter amplifier for vision carrier (V.C.) processing
0 Linear multiplier for quadrature demodulation
Second IF (two separate channels for both FM sound signals).
0 4-stage-limiting amplifier
0 Ouadrature demodulator
0 AF amplifier with de-emphasis
O Output buffer
0 Muting for one or both AF outputs
TDA 4427 VIDEO IF CIRCUIT
Technology: Bipolar
Features:
o Very high input sensitivity
0 Very low intermodulation
products
0 Minimum differential error
o Constant input impedance
independent of AGC
o Fixed video output, voltage
with small tolerance range
o Negative video signal hardly
affected by supply voltage
variations
o Very few external components
TDA 4427 A: For ceramic sound traps
Extreme fast AGC action - gating
largely independent of pulse shape
and amplitude
Positive as well as neg. video signal
available from low-impedance outputs
Positive or negative going gating pulse
Large AFC output current swing
(push-pull output)
Switchable AFC
Connecting and basic circuitry compa-
tible to the TELEFUNKEN electronic
video IF type programme - permits
building block system for video IF
module.
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