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TDA8340 Datasheet(PDF) 4 Page - NXP Semiconductors |
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TDA8340 Datasheet(HTML) 4 Page - NXP Semiconductors |
4 / 14 page November 1987 4 Philips Semiconductors Product specification Television IF amplifier and demodulator TDA8340 TDA8341 PINNING FUNCTIONAL DESCRIPTION IF amplifier This is a 3-stage, gain-controlled IF amplifier with a wide dynamic range. On-chip capacitors in the d.c. feedback loop of the amplifier maintain stability at maximum gain. Internal stabilization of the supply voltage ensures the desired sensitivity and gain control range over the whole supply voltage range and also gives very good power supply ripple rejection in this part of the circuit. Demodulator The redesigned IF demodulator is a quasi-synchronous circuit that employs passive carrier regeneration and logarithmic clamping to give improved signal handling. The demodulator input is a.c. coupled to the IF amplifier to reduce d.c. offsets and thus minimize residual IF carrier in the output signal. Video amplifier The linearity and bandwidth of the video amplifier are sufficient to meet all wide band requirements, e.g. for teletext transmissions. Second harmonics of the IF carrier are effectively reduced by a Sallen-Key low pass interstage filter between the demodulator output and the video amplifier input. An integrated filter in the noise inverter reduces the sensitivity of the video amplifier for high sound carriers. White spot protection comprises a white spot clamp system combined with a delayed-action inverter which is also highly resistant to high sound carriers. Note. To prevent radiated video output at the input pins, connect a 6,8 µH inductor in series with pin 12 and fit as close as possible to the IC body. Use short leads. AGC detector A Bessel low-pass filter between the video output and the AGC detector improves the detector function in the presence of high sound carriers. No ‘hang-up’ occurs in the detector after pin 14 has been short-circuited to ground (VCR switch operated). The detector also generates the sample-and-hold pulse for the AFC system. 1 and 16 Balanced IF inputs 2 and 15 IF amplifier decoupling 3 Tuner AGC starting point adjustment 4 Tuner AGC output 5 AFC output 6 AFC on/off switch and sample-and-hold capacitor 7 and 10 Reference carrier π/2 rad. phase shift 8 and 9 IF picture carrier passive regeneration 11 Positive supply voltage (VCC) 12 Video output 13 Ground (VEE) 14 IF AGC capacitor and VCR switch |
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