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ADV7343 Not Recommended for New Designs
The ADV7342/ADV7343 are high speed, digital-to-analog video encoders in a 64-lead LQFP package. Six high speed, 3.3 V, 11-bit video DACs provide support...
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ADV7343 Video issue

Revanth

on Aug 28, 2019

Hi,

I have my custom made ADV7343 board where iam giving 27MHZ clock input now i want the test pattern to be generated. This is our secon revision in first revision we had some problem but got resolved ( https://ez.analog.com/video/f/q-a/102379/adv7343-output-video-not-proper ) now in this board when i give 27MHZ input i2C lines is alsi in 27 MHZ as shown below

My input clock is shown below

Even in the output i think this clock is influencing

I checked my input clock it clean and proper, voltages and pull ups are proper i also doubt whether the 27mhz show in the i2c lines is not allowing proper configuration of I2C, i checked for short between 12C , supply and input clock there is no short. i also attach schematic down for ur reference.

Kindly suggest any solution for this problem.

Thanks!

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0 PoornimaSubramani

on Aug 28, 2019 7:00 PM
Hi,

The I2C registers can be accessed read/write without the input clock because it uses the I2C SCLK.

The internal clock comes directly from the external clock, 27MHz.

After power-up, Wait 5mS to access I2C,because internal clock should be stable,then the device will work fine.

Thanks,

Poornima
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0 Revanth
on Aug 28, 2019 7:21 PM in reply to PoornimaSubramani
Hi Poornima ,

I2C is fine when no external clock has been given, I can also able to write without external clock, but the moment when I connect 27mhz to the pin it's affecting every where, I can see the 27mhz at the scl and SDA pin. This is bit weird!
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0 Revanth
on Aug 28, 2019 7:21 PM in reply to PoornimaSubramani
Hi Poornima ,

I2C is fine when no external clock has been given, I can also able to write without external clock, but the moment when I connect 27mhz to the pin it's affecting every where, I can see the 27mhz at the scl and SDA pin. This is bit weird!
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