CXA2019 Просмотр технического описания (PDF) - Sony Semiconductor
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CXA2019 Datasheet PDF : 30 Pages
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CXA2019AQ
4. YUV Reinput System
The U and V color difference signals (output from the PINP processor) input to Pins 12 and 13 are clamped
according to the pulse input to Pin 10, gain controlled by the U2 and V2 drive circuits, the DC of their video
portion is controlled by the U2PED and V2PED circuits, and then these signals are output from Pins 6 and 7.
This function allows adjustment of the white balance and black level of the PINP sub picture.
In addition, the Y signal input to Pin 11 is clamped in the same manner, gain controlled by the Y2 drive
circuit, and output from Pin 8. At this time, bright ABL with a polarity opposite that of the main picture ABL
can be applied by inputting the main picture Y/C/J IC ABLFIL voltage to Pin 9. This allows fluctuation of the
black level of the sub picture caused by the main picture ABL to be suppressed. This reverse polarity ABL
can be turned ON and OFF and the gain and control curve center values can be set by the I2C bus register.
Notes on Operation
• The CXA2019AQ does not perform the initial settings during power ON. This initial data should be input from
a microcomputer.
• Because the YUV signal output from the CXA2019AQ are DC direct connected, the board pattern must be
designed consideration given to minimizing interference from around the power supply and GND.
Do not separate the GND patterns for each pin; a solid earth is ideal. Locate the power supply side of the
bypass capacitor which is inserted between the power supply and GND as near to the pin as possible. Also,
locate the XTAL oscillator, ceramic oscillator and IREF resistor as near to the pin as possible, and do not wire
signal lines near this pin.
• Use lead type (HC-49/U type) for each XTAL oscillator. Confirm that there is no problem for capture range
color response and others at resistors and capacitors as shown in Application Circuit.
• Murata's Ceralock is recommended for ceramic oscillator. When using only for NTSC, 503.5kHz Ceralock; for
NTSC/PAL, 500kHz Ceralock is recommended.
• Use a resistor (such as a metal film resistor) with an error of less than 1% for the IREF pin.
• For unused pins, leave them open.
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