AM1806 Load capacity

H.ro

Intellectual 280 points

Other Parts Discussed in Thread: AM1806

I'm thinking to divide Oscillator(24MHz) into OSCIN and Sensor's VCLK.

- Please let me know how large input load capacity of OSCIN.

On the other part

I'm thinking to divide Sonsor's PCLK(24MHz) into VPCLKIN_0 and VPCLKIN_2.

- Please let me know how large input load capacity of VPCLKIN_0 and VPCLKIN_2.

I wanna use VPIF output (VP_DOUT0 - VP_DOUT7 and VPCLKOUT_2).

- It must be synchronized VPCLKIN_0 and VPCLKIN_2?

[Connection diagram]

                          ---------------------
                          | [AM1806]        |
Oscillator ------| OSCIN            |
                     |    |                          |
                     |    | VPCLKIN_0   |----|
                     |    |                          |     |
                     |    | VPCLKIN_2   |----|
                     |    |                          |     |
                     |    ---------------------     |
                     |                                     |
                     |   ----------------------     |
                     |   | [Sensor]    |     |
                     --- VCLK -> PCLK -----
                         |                           |
                         ----------------------

over 13 years ago

0 Paul.Yin over 13 years ago

TI__Genius 14405 points

For max/min current, please have a look at section 4.4 (electrical characteristics) of the device datasheet.

I wanna use VPIF output (VP_DOUT0 - VP_DOUT7 and VPCLKOUT_2). - It must be synchronized VPCLKIN_0 and VPCLKIN_2?

could you please elaborate here? if you want to synchronize input and ouput, you need to make sure VPCLKIN_0 and VPCLKIN_2 are sourced by the same clock.

0 H.ro over 13 years ago in reply to Paul.Yin

Intellectual 280 points

Thanks for answering my quesions.

> could you please elaborate here?

Now on my board VPCLKIN_0 don't synchronize VPCLKIN_2.

Does it cause any problems?

[sequence]

- AM1806 takes a VGA picture from sensor and adds some word on it.

After that, AM1806 put the picture to VPIF output.

repeat these.

0 Paul.Yin over 13 years ago in reply to H.ro

TI__Genius 14405 points

I would recommend you to syncrhonize the two. Otherwise, in the long run, I believe you will see a corrupted screen once a while caused by the mismatch in frequencies.

0 H.ro over 13 years ago in reply to Paul.Yin

Intellectual 280 points

Thank you very much.

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AM1806 Load capacity