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CXA1645P Datasheet(PDF) 12 Page - Sony Corporation

Part No. CXA1645P
Description  RGB Encoder
Download  14 Pages
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Maker  SONY [Sony Corporation]
Homepage  http://www.sony.co.jp

 12 page
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– 12 –
Notes on Operation
Be careful of the following when using the CXA1645P/M.
1. This IC is designed for image processing of personal computers and video games. When using the IC in
other video devices, make thorough investigations on image quality.
2. Be sure that analog RGB signals are input at 1.0Vp-p maximum and have low enough impedance. High
impedance may affect color saturation, hue, etc. Inputting RGB signals in excess of 1.3Vp-p may disable
the clamp operation.
3. The SC input (Pin 6) can be either a sine wave or a pulse in the range from 0.4 to 5.0Vp-p.
However, when a pulse is input, its phase may be shifted several degrees from that of the sine wave input.
In the IC, the SC input is biased to 1/2 VCC. Accordingly, when a 5.0Vp-p pulse is input and the duty factor
deviates from 50%, High- and Low-level pulse voltages may exceed VCC and GND in the IC, which causes
subcarrier distortion. In such a case, be very careful that the duty factor keeps to 50%.
4. When designing a printed circuit board pattern, pay careful attention to the routing of the VCC and GND
leads. To decouple the VCC and VREF pins, use tantalum, ceramic or other capacitors with good frequency
characteristics. Ground the capacitors by connections shown below as closely to each IC pin as possible.
Try to design the leads as short and wide as possible.
... GND1
... GND2
Design the pattern so that VCC (or VREF) is connected to GND via a capacitor at the shortest distance.
5. SC and SYNC input pulses
Attach a resistor and a capacitor to eliminate high-frequency components of SC (Figure A) and SYNC
(Figure B) before input.
Be careful not to input pulses containing high-frequency components. Otherwise, high-frequency
components may flow into VCC, GND and peripheral parts, resulting in malfunctions.
6. Connecting an external resistor to the 75
Ω driver output pin
A capacitance of several dozen picofarads at each pin may start oscillation. To prevent oscillation, design
the pattern so that a 75
Ω resistor is mounted near the pin (see Figure C).
When any of the 75
Ω driver output pins is not in use, leave it unconnected and design the pattern so that
no parasitic capacitance is generated on the printed circuit board.
Fig. A
Fig. B
Fig. C
Make these leads short.

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