PDF TDA9181P Data sheet ( Hoja de datos )

Número de pieza	TDA9181P
Descripción	Integrated multistandard comb filter
Fabricantes	NXP Semiconductors
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No Preview Available ! INTEGRATED CIRCUITS DATA SHEET TDA9181 Integrated multistandard comb filter Objective speciﬁcation File under Integrated Circuits, IC02 2000 Nov 22 1 page Philips Semiconductors Integrated multistandard comb ﬁlter Objective speciﬁcation TDA9181 FUNCTIONAL DESCRIPTION Input conﬁguration The Y/CVBS1 and Y/CVBS2 input signals are clamped by means of an internally generated clamp pulse which is derived from the sandcastle input signal (pin SC). If no sandcastle signal is available, a clamp pulse signal may be applied to pin SC. External clamp capacitors are needed. The buffered and clamped Y/CVBS1 and Y/CVBS2 signals are then applied to the input switch. The input switch select signal (INPSEL) determines whether Y/CVBS1 or Y/CVBS2 is passed through to the anti-alias low-pass filter. This 3rd-order low-pass filter is optimized for best performance with respect to step response and clock suppression. The filtered signal is sampled at a clock frequency of four times the colour subcarrier frequency (fSC). A colour subcarrier frequency signal is applied to pin FSC. The colour subcarrier select input signal (FSCSEL) indicates whether the colour subcarrier frequency (fSC) or twice the colour subcarrier frequency (2 × fSC) is being applied at the FSC input. An external coupling capacitor is needed for the colour subcarrier input signal. Comb ﬁlter The sampled CVBS signal is applied to two delay lines. Depending on the applied standard, one delay line delays the signal over 1 or 2H for NTSC and PAL respectively (1H = one line-time). The standard select inputs SYS1 and SYS2 indicate which standard, PAL B, G, H, D, I, M, N or NTSC M, is being applied. The direct and delayed signals are applied to an adaptive comb filter. The adaptive comb filter performs band-pass filtering around the colour subcarrier frequency and compares the contents of adjacent lines. In this way the combing of signals with different information is prevented and artifacts such as hanging dots are avoided. Both the combed chrominance and the combed luminance signals are passed through a reconstruction low-pass filter to obtain continuous-time signals. These low-pass filters are 3rd-order, optimized for best performance with respect to step response and clock suppression. The reconstructed signals are applied to the output switches. Output conﬁguration The luminance output switch selects between the reconstructed combed luminance signal and one of the buffered and clamped input signals, Y/CVBS1 or Y/CVBS2. The chrominance output switch selects between the reconstructed combed chrominance signal and the chrominance input signal (CIN). An external coupling capacitor is needed for CIN. The selected signals are applied to the outputs Y/CVBSOUT and COUT respectively via a buffer stage. The output switch signal (OUTSEL) determines whether the output switches select the internal combed signals or the external Y/C signals. Clock generation and ﬁlter tuning The clock generator is driven by a Phase-Locked Loop (PLL) circuit which generates a reference frequency of four times the colour subcarrier frequency. This PLL circuit is phase-locked to the colour subcarrier input signal (FSC). Several internal clock signals are derived from the 4 × fSC reference. The filter tuning ensures the automatic alignment of the anti-alias and the reconstruction low-pass filters. A 4 × fSC clock signal is used as a reference for the alignment. The tuning takes place each line during the line blanking and is initiated by means of an internally generated signal which is derived from the sandcastle input signal. If the output switches select external Y/C signals the oscillator of the PLL circuit is stopped regardless of the FSC input and no internal clock signals are generated. The filter tuning is also stopped. 2000 Nov 22 5 5 Page Philips Semiconductors Integrated multistandard comb ﬁlter Objective speciﬁcation TDA9181 SYMBOL PARAMETER CONDITIONS MIN. Chrominance output; pin COUT Vo(COUT)(p-p) chrominance output signal (peak-to-peak value) EG(chrom) B−3dB(chrom) chrominance gain error −3 dB chrominance bandwidth ∆t(proc)(Y) VDC S/Nchrom αct fclk(res)(chrom) difference with luminance processing delay DC voltage level chrominance signal-to-noise ratio (0.7 V/Vrms noise) crosstalk between different inputs residues of clock frequencies in the chrominance signal (Vrms/0.7 V) FSCres(YC) αct FSC residue in YC mode (Vrms/0.7 V) crosstalk suppression at vertical transient no-colour colour [0.7 V/V (p-p)] COMB mode, around fSC; note 2 YC mode; base-band unweighted; fSC ± 0.3fSC; note 2 0 to 5 MHz COMB mode; note 2 f = 4 × fSC f = 2 × fSC f = 1.33 × fSC f = fSC f = fSC; fSC at FSC input; note 2 f = 2 × fSC; 2 × fSC at FSC input vertical transition active video ↔ vertical blanking; see Figs 6 and 7 and note 6 − −1 1.5 10 − − 56 − − − − − − − 26 TYP. 0.7 0 − − 0 1.5 − − − − − − − − − MAX. UNIT 1.1 V +1 dB − MHz − MHz 20 ns −V − dB −50 dB −30 dB −30 dB −40 dB −50 dB −60 dB −60 dB − dB 2000 Nov 22 11 11 Page

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