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VSP9405B Datasheet(PDF) 8 Page - Micronas |
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VSP9405B Datasheet(HTML) 8 Page - Micronas |
8 / 126 page VSP 94x2A DATA SHEET 8 Aug. 16, 2004; 6251-552-1DS Micronas Fig. 2–2: CVBS, Y and C Amplitude Characteristics. When using the sync height based AGC mode, the A/D gain increases or decreases depending on the incom- ing signal. When using overflow detection only, the gain is set to maximum and is reduced whenever an ’overflow’ occurs. The signal is low pass filtered so that chrominance and noise are not used for detection. The threshold can be adjusted by PWTHD. A setting of ’11’ equals 511 and means an overflow of the ADC. Other settings react for a lower level. The gain only becomes higher when a change of the channel is detected or is manually reset by AGCRES. AGCFRZE holds the current AGC value. A manual setting of the ADCs gain control is possible using the parameters AGCADJ1 and AGCADJ2. The conversion range (CR) is bigger than the signal range (SRY, SRC) leaving a headroom for overshoots (see Fig. 2–2). . Fig. 2–3: CVBS ADC Characteristic 2.1.3. Clamping The timing of the clamping (pulse) control signals for the analog inputs are derived from its corresponding CVBS input signal. The clamping algorithm works with a split measurement pulse and a clamping pulse. The measurement pulse is used to detect the clamping error. The clamping pulse is used to enable current sources for reducing the detected clamping errors. The start and length of the measurement signals are inde- pendently adjustable for both channels (CLMPST1, CLMPD1 , CLMPST2, CLMPD2). The same applies for the clamping signals (CLMPST1S, CLMPD1S, CLMPST2S, CLMPD2S). Clamping and measurement signals for RGB channel are not separate. Clamping for these ADC are con- trolled by CLMPST2S and CLMPD2S only. Clamping can be suppressed for some lines by CLMPLOW and CLMPHIGH to ignore copyprotection information. No external sync signals are required. Fig. 2–4: Clamping Signals 511 442 144 16 0 white black 511 446 256 64 0 upper headroom lower headroom upper headroom 0 8 16 24 32 40 48 56 64 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 Gain Control Characteristic AGCADJ1, AGCADJ2 (I²C) CLMPD2 CLMPD1S CLMPST1S CLMPD1 CLMPST1 Clamping ADC1 CLMPD2S CLMPST1S CLMPST2 Measurement ADC1 Measurement and Clamping RGBF Clamping ADC2 Measurement ADC2 |
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