X64-AN Quad User's Manual
Theory of Operation
47
Sapera parameters for Contrast and Brightness :
CORACQ_PRM_CONTRAST: Contrast percentage
CORACQ_PRM_BRIGHTNESS: Brightness percentage
Note
: For the X64-AN Quad under Sapera, contrast percentage ranges from 60% to 170% with
100% being the default value. Brightness percentage ranges from –20% to 29% with 0 % being
the default value.
A/D Converter
The X64-AN Quad uses a high speed Analog to Digital Converter (ADC). The ADC outputs a 8-bit
unsigned binary values from 0x0 to 0xFF based on: the sampled analog input signal level, the ADC
sampling window, and by the clamping voltage level. The Pixel Clock used by the ADC to sample the
analog video comes from the PLL clock.
Analog Video
ADC
Digital Video
Pixel Clock
Figure 26: A/D Converter diagram