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STV2310 数据表(PDF) 14 Page - STMicroelectronics |
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STV2310 数据表(HTML) 14 Page - STMicroelectronics |
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14 / 112 page  Functional Description STV2310 14/112 4 Functional Description 4.1 Analog Input Stage 4.1.1 General Description The Analog Input Stage provides the interface between the incoming video signals and the Analog- to-Digital Converters (ADC) using Clamp and Automatic Gain Control (AGC) stages to fit the analog signals to the ADC range. Several video sources are processed in this stage: ● CVBS signals from a broadcast signal or the SCART connector. ● S-Video (Y/C) signals coming from an external video source (VCR, DVD, STB). ● RGB signals with Fast Blanking (FB) input coming from the SCART connector. ● Analog YCrCb signals coming from a DVD player (1H interlaced). The CVBS/Y signal from the selected input channel goes through an automatic clamp and a Programmable Gain Amplifier (PGA) circuit. The clamping circuit automatically adjusts the black level to a programmable A/D output digital code. The clamp voltage is stored on the input coupling capacitor (22 nF, external to the STV2310). The PGA automatically adjusts the input signal Figure 5: Analog Input Stage Functional Block Diagram FB R_CR G B_CB CVBS1/Y CVBS2/Y C Chroma Bias Composite and Luminance Input Channels 8-bit ADC Chrominance Input Channel 8-bit ADC 8-bit ADC 8-bit ADC B_CB Clamp Control RGB and Fast Blanking Input Channels Anti-Aliasing Filter ADC Bias 2 6-bit Interpolator Controller G Clamp Control Controller R_CR Clamp Control Controller 10-bit ADC ADC Bias 1 PGA Analog Switch CVBS Clamp Control ±6 dB |
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