TDA9881TS datasheet(9/42 Pages) NXP

Part #	TDA9881TS

Description	Alignment-free vision and FM sound IF PLL demodulator for negative modulated TV standards

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Manufacturer	NXP [NXP Semiconductors]

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9397 750 13417

Product data sheet

Rev. 01 — 16 November 2004

9 of 42

Philips Semiconductors

TDA9881

Alignment-free vision and FM sound IF PLL demodulator

The AFC signal is derived from the corresponding downcounter stop value after a

counting cycle. The last four bits are latched and the digital-to-analog converted value is

given as current at pin AFC.

8.7 Video demodulator and ampliﬁer

The video demodulator is realized by a multiplier which is designed for low distortion and

large bandwidth. The VIF signal is multiplied with the ‘in phase’ signal of the VIF PLL

VCO.

The demodulator output signal is fed into the video preampliﬁer via a level shift stage with

integrated low-pass ﬁlter to achieve carrier harmonics attenuation.

The output signal of the preampliﬁer is fed to the VIF AGC detector (see Section 8.3) and

in the sound trap mode is also fed internally to the integrated sound carrier trap;

see Section 8.8. The differential trap output signal is converted and ampliﬁed by the

following postampliﬁer. The video output level at pin CVBS is 2 V (p-p).

Noise clipping is provided.

8.8 Sound carrier trap

The sound carrier trap consists of a reference ﬁlter, a phase detector and the sound trap

itself.

A sound carrier reference signal is fed into the reference low-pass ﬁlter and is shifted by

nominal 90 degrees. The phase detector compares the original reference signal with the

signal shifted by the reference ﬁlter and produces a DC voltage by charging or discharging

an integrated capacitor with a current proportional to the phase difference between both

signals, respectively to the frequency error of the integrated ﬁlters. The DC voltage

controls the frequency position of the reference ﬁlter and the sound trap. Thus the

accurate frequency position for the different standards is set by the sound carrier

reference signal.

The sound trap itself is constructed of three separate traps to realize sufﬁcient

suppression of the ﬁrst and second sound carrier.

8.9 SIF ampliﬁer

The SIF ampliﬁer consists of three AC-coupled differential stages. Gain control is

performed by emitter degeneration. The total gain control range is typical 66 dB. The

differential input impedance is typical 2 k

Ω in parallel with 3 pF.

8.10 SIF AGC detector

SIF gain control is performed by the detection of the SIF voltage at the output of the SIF

ampliﬁer so that a constant SIF signal is supplied to the single reference QSS mixer.

For an optimum adaption between the SIF AGC and the VIF AGC characteristics at 13 dB

picture-to-sound FM carrier ratio, the internal SIF level is reduced.

The integrated AGC capacitor is charged or discharged for the generation of the required

SIF gain via a comparator. An additional circuit (threshold approximately 7 dB) ensures a

very fast gain reduction for a large increasing IF amplitude step.

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