Integrated NTSC comb filter

INTEGRATED CIRCUITS DATA SHEET TDA9183 Integrated NTSC comb filter Objective specification Supersedes data of 2000 Nov 22 File under Integrated Circuits, IC02 2000 Nov 30 Philips Semiconductors Objective specification Integrated NTSC comb filter FEATURES • One-chip NTSC adaptive comb filter • Cross luminance reduction • Cross colour reduction • No chroma trap, therefore sharper vertical luminance transients • Analog discrete-time signal processing, therefore no quantization noise • Anti-aliasing and reconstruction filters are included • Input switch selects between two Y/CVBS inputs • Output switch selects between combed CVBS and an external Y/C source • fSC as well as 2 × fSC colour subcarrier signal may be applied • Alignment free • Few external components • Low power. QUICK REFERENCE DATA SYMBOL VCCA ICCA VDDD IDDD Vi(Y/CVBS)(p-p) Vi(CIN)(p-p) Vi(FSC)(p-p) Vo(Y/CVBS)(p-p) Vo(CIN)(p-p) analog supply voltage analog supply current digital supply voltage digital supply current luminance or CVBS input signal voltage (peak-to-peak value) chrominance input signal voltage (peak-to-peak value) colour subcarrier input signal voltage (peak-to-peak value) luminance or CVBS output signal voltage (peak-to-peak value) chrominance output signal voltage (peak-to-peak value) PARAMETER MIN. 4.5 − 4.5 − 0.7 − 100 0.6 − TYP. 5.0 25 5.0 10 1.0 0.7 200 1.0 0.7 GENERAL DESCRIPTION TDA9183 The TDA9183 is a an adaptive NTSC comb filter with two internal delay lines, filters, clock control and input clamps. The NTSC M video standard is supported. Two CVBS input signals can be selected by means of an input switch. The selected CVBS input signal is filtered to obtain a combed luminance output signal and a combed chrominance output signal. Switched capacitor circuit techniques are used, requiring an internal clock, locked on to the colour subcarrier frequency. The colour subcarrier frequency as well as twice the colour subcarrier frequency may be applied to the IC. In addition to the comb filter the circuit contains an output switch so that a selection can be made between the combed CVBS signal and an external Y/C signal. The IC is available in a DIP16 and SO16 package. The supply voltage is 5 V. MAX. 5.5 − 5.5 − 1.4 1.0 400 1.54 1.1 UNIT V mA V mA V V mV V V ORDERING INFORMATION TYPE NUMBER TDA9183P TDA9183T PACKAGE NAME DIP16 SO16 DESCRIPTION plastic dual in-line package; 16 leads (300 mil); long body plastic small outline package; 16 leads; body width 7.5 mm VERSION SOT38-4 SOT162-1 2000 Nov 30 2 This text is here in white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader.This text is here in _white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader.This text is here inThis text is here in white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader. white to force landscape pages to be ... 2000 Nov 30 handbook, full pagewidth BLOCK DIAGRAM Philips Semiconductors Integrated NTSC comb filter VCCA 6 VDDD 5 14 INPSEL Y/CVBS1 2 12 Y/CVBSOUT CLAMP LPF 2H/4H DELAY ADAPTIVE COMB FILTER LPF Y/CVBS2 3 CLAMP LPF TDA9183 1 7 FILTER TUNING (LPFs) 10, 11 9 4 × fsc CLOCK GENERATOR 16 COUT 3 CIN SC SANDCASTLE DETECTOR 8 13 4 15 n.c. FSC FSCSEL AGND DGND OUTSEL MGT535 Objective specification TDA9183 Fig.1 Block diagram. Philips Semiconductors Objective specification Integrated NTSC comb filter PINNING SYMBOL CIN INPSEL Y/CVBS2 DGND VDDD VCCA SC FSCSEL FSC n.c. n.c. Y/CVBS1 AGND Y/CVBSOUT OUTSEL COUT PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 TDA9183 DESCRIPTION chrominance signal input input switch select input luminance or CVBS signal 2 input digital ground digital supply voltage analog supply voltage sandcastle signal input colour subcarrier select input colour subcarrier signal input not connected not connected luminance or CVBS signal 1 input analog ground (signal reference) luminance or CVBS signal output output switch select input chrominance signal output handbook, halfpage CIN 1 handbook, halfpage 16 COUT 15 OUTSEL 14 Y/CVBSOUT 13 AGND CIN 1 16 COUT 15 OUTSEL 14 Y/CVBSOUT 13 AGND INPSEL 2 Y/CVBS2 3 DGND 4 INPSEL 2 Y/CVBS2 3 DGND 4 TDA9183P VDDD 5 VCCA 6 SC 7 FSCSEL 8 MGT536 TDA9183T 12 Y/CVBS1 11 n.c. 10 n.c. 9 FSC VDDD 5 VCCA 6 SC 7 FSCSEL 8 MGT537 12 Y/CVBS1 11 n.c. 10 n.c. 9 FSC Fig.2 Pin configuration (DIP16). Fig.3 Pin configuration (SO16). 2000 Nov 30 4 Philips Semiconductors Objective specification Integrated NTSC comb filter 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. One delay line delays the signal over 1H (1H = one line-time). 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 signal 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 TDA9183 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 30 5 Philips Semiconductors Objective specification Integrated NTSC comb filter Mode definitions Table 1 General mode definitions; note 1 MODE COMB YC Table 4 TDA9183 Input switch mode definitions; note 1 INPUT SWITCH MODE Y/CVBS1 input selected Y/CVBS2 input selected PIN INPSEL LOW HIGH Note PIN OUTSEL LOW HIGH Note 1. If the OUTSEL pin is left open-circuit, the pin is pulled LOW by means of an internal pull-down resistor to analog ground (AGND). Thus the COMB mode can also be selected by not connecting the OUTSEL pin. Table 2 Y/CVBSOUT output signal definitions Y/CVBSOUT OUTPUT SIGNAL comb filtered luminance signal Y/CVBS1 or Y/CVBS2 signal COUT output signal definitions COUT OUTPUT SIGNAL comb filtered chrominance signal CIN signal 1. If the INPSEL pin is left open-circuit, the pin is pulled LOW by means of an internal pull-down resistor to analog ground (AGND). Thus the Y/CVBS1 input can also be selected by not connecting the INPSEL pin. Table 5 FSC mode definitions; note 1 FSC INPUT SIGNAL FREQUENCY fSC 2 × fSC PIN FSCSEL LOW HIGH Note MODE COMB YC Table 3 MODE COMB YC 1. If the FSCSEL pin is left open-circuit, the pin is pulled LOW by means of an internal pull-down resistor to analog ground (AGND). Thus the fSC mode can also be selected by not connecting the FSCSEL pin. 2000 Nov 30 6 Philips Semiconductors Objective specification Integrated NTSC comb filter LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 60134). SYMBOL VDDD VCCA Vi(prot)(th) Tstg Tamb Tsol Tj Ves PARAMETER digital supply voltage analog supply voltage input voltage protection threshold storage temperature ambient temperature soldering temperature junction temperature electrostatic handling voltage HBM; all pins, except pins 5 and 6; notes 1, 2 and 3 MM; all pins, except pins 5 and 6; notes 1, 4 and 5 Notes 1. All pins are protected against ESD by means of internal clamping diodes. 2. Human Body M