TDA8296 datasheet(11/87 Pages) NXP

No de pièce	TDA8296

Description	Digital global standard low IF demodulator for analog TV and FM radio

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TDA8296

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Product data sheet

Rev. 1 — 3 March 2011

11 of 87

NXP Semiconductors

TDA8296

Digital global standard low IF demodulator for analog TV and FM radio

A video leveling stage follows, which brings the output within the SCART specification

(

±3 dB overall), despite heavy over modulation. The response time is made very slow.

Finally, a video equalizer allows to compensate the perhaps non-flat frequency response

from the tuner or to change the overall video response according to customer wish (i.e.

peaking or early roll-off).

8.5 Upsampler and video DAC

The filtered and compensated CVBS signal is connected to the oversampled 10-bit video

DAC (fs = 108 MHz) via an interpolation stage. The strong oversampling replaces a

former complicated LCR postfiltering by a simple first-order RC low-pass filter to remove

the DAC image frequencies sufficiently. This holds also for the sound DAC, described in

Section 8.6.

8.6 SSIF/mono sound processing

The complex signal is routed via a band-pass, AGC and interpolation filter to the 10-bit

sound DAC for the recovery of the second sound carriers (SSIF). A very sharp band-pass

filter at 5.5 MHz is added in the FM Radio mode to remove neighbor channels. This also

eases the dynamic burden on the following ADC in the demodulator/decoder chip. The

afore-mentioned high-selectivity band-pass, which replaces the former ceramic filter, is

located behind a frequency shifter. In there, the incoming wanted FM radio channel from

the Silicon Tuner is changed from 1.25 MHz to 5.5 MHz.

Moreover, the complex signal is demodulated in a linear CORDIC detector and low-pass

filtered to attenuate the video spectrum and the second sound carrier, respectively other

disturbers above the intercarrier. The output of the linear CORDIC (phase information) is

differentiated for getting the demodulated FM audio. The AM demodulation is executed in

a synchronous fashion by using a narrow-band PLL demodulator.

A de-emphasis filter is implemented for FM standards, before the audio is interpolated to

108 MHz as in the CVBS case.

The mono audio is made available in the sound DAC via an I2C-bus controlled selector in

case the intercarrier path is not used for driving an external stereo demodulator.

However, if the mono audio output has to meet the SCART specification, an external

cheap operational amplifier with 12 dB gain becomes necessary, because the low supply

voltage for the TDA8296 doesn’t allow such high levels like 2 V (RMS) maximum.

8.7 Tuner IF AGC

This AGC controls the tuner IF AGC amplifier in the TDA1827x in such a way, that the

IF ADC is always running with a permanent headroom of 3 dB for the sum of all signals

present at the ADC input. This ensures an always optimal exploitation of the dynamic

range in the IF ADC.

The detection is done in peak Search mode during a field period. The attack time is made

much faster than the decay time in order to avoid transient clipping effects in the IF ADC.

This can happen during channel change or airplane flutter conditions.

Numéro de pièce similaire - TDA8296

Fabricant	No de pièce	Fiches technique	Description
NXP Semiconductors	TDA8295	474Kb / 77P	Digital global standard low IF demodulator for analog TV and FM radio Rev. 01-4 February 2008
	TDA8295	3Mb / 83P	Digital global standard low IF demodulator for analog TV and FM radio Rev. 02-27 November 2009
	TDA8295C2	3Mb / 83P	Digital global standard low IF demodulator for analog TV and FM radio Rev. 02-27 November 2009
	TDA8295HN	474Kb / 77P	Digital global standard low IF demodulator for analog TV and FM radio Rev. 01-4 February 2008
	TDA8295HN	3Mb / 83P	Digital global standard low IF demodulator for analog TV and FM radio Rev. 02-27 November 2009

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NXP Semiconductors	TDA8295	474Kb / 77P	Digital global standard low IF demodulator for analog TV and FM radio Rev. 01-4 February 2008
	TDA8295	3Mb / 83P	Digital global standard low IF demodulator for analog TV and FM radio Rev. 02-27 November 2009
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