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CXA2075M Datasheet

  • CXA2075M

  • RGB Encoder

  • Sony   Sony

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CXA2075M
Notes on Operation
Be careful of the following when using the CXA2075M.
1. 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.
2. 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 V
CC
. Accordingly, when a 5.0Vp-p pulse is input and the duty factor
deviates from 50%, High- and Low-level pulse voltages may exceed V
CC
and GND in the IC, which causes
subcarrier distortion. In such a case, be very careful that the duty factor keeps to 50%.
3. When designing a printed circuit board pattern, pay careful attention to the routing of the V
CC
and GND
leads. To decouple the V
CC
pin, 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.
V
CC
1... GND1
V
CC
2... GND2
Design the pattern so that V
CC
is connected to GND via a capacitor at the shortest distance.
4. SC and SYNC input pulses
Attach a resistor and a capacitor to eliminate high-frequency components of SC (Fig. A) and SYNC (Fig. B)
before input.
2.2k
5P
2.2k
47P
Fig. A
Fig. B
Be careful not to input pulses containing high-frequency components. Otherwise, high-frequency
components may flow into V
CC
, GND and peripheral parts, resulting in malfunctions.
5. Connecting an external resistor to the 75鈩?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鈩?resistor is mounted near the pin (see Fig. C).
鈭?/div>
75
鈭?/div>
Make these leads short.
鈭?/div>
Fig. C
When any of the 75鈩?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.
鈥?13 鈥?/div>

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