M52036SP 查看數據表（PDF） - Renesas Electronics

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M52036SP

SYNC SIGNAL PROCESSOR

Renesas Electronics 

M52036SP

Fig. D shows an example of the measures for improving the allowable duty ratio in a range of 1.4 Vp-p or over of

the input signal.

For use in a range outside the specified value, confirm that the waveform complies with Fig. E when measured it

after removing the filters in pins [7] and [9].

3) Polarity detection and empty input detection (pins [7] and [9])

A capacitor is required to be installed external as a filter for polarity detection and empty input detection. The large

the capacitance, the smaller the ripple and reduces malfunction. However, the detecting time is lengthened.

For an input of 15 kHz, a capacitor of 0.05 µF or larger is recommended. For 60 Hz, a 10 µF or larger is sufficient.

If it is necessary to use a capacitor of smaller capacitance, measure the waveform at the filter terminal under the

condition of the lowest frequency of the input sync signal to be used and the smallest duty ratio. And make sure

that the signal shows 7.5 V (actually 6.6 V) or over for positive polarity input or 4.5 V (actually 5.5 V) or lower for

a negative polarity input.

4) VERT S/S IN (pins [11])

For V sync separation, signals are generated by externally integrating composite sync signals, and are then input.

The composite sync signals that are input to pin [6] (H + V) ore output to pin [14] HD+. For V sync separation, pin

[14] HD+ output is externally integrated, and input to pin [11]. Check pin [11] waveform to see if the H element is

adequately low.

In the IC, the sync separation threshold level is set to approximately 1 V when no external adjustment is provided.

Rev.1.0, Sep.22.2003, page 10 of 13

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