VSP1000: output of vsp1000 getting attenuated

VISHAL KALWANI

Part Number: VSP1000

I have apply 8V offset and 1V peak to peak of 1Mhz.

But at output of vsp1000 getting half voltage that 0.5v peak to peak.

I have attached the input,output waveform and schematic.

0 Praveen Aroul over 5 years ago

Hi Vishal,

This device is not recommended for new designs and additionally, the applications support is also very limited.

I am checking with my team and will get back to you by Wednesday.

0 Praveen Aroul over 5 years ago in reply to Praveen Aroul

Hi Vishal,

Can you please confirm if the RIDRV on the board is 133 KOhm?

The resistor connected at IDRV determines the drive strength of the output buffer.

There is a dependency of IDRV (uA) and the input margin voltage from VCC (Refer figure 3).

Please measure the IDRV on your board and set the appropriate input voltage offset from VCC.

0 VISHAL KALWANI over 5 years ago in reply to Praveen Aroul

YES RIDRV ON BOARD IS 133K.

And VCC on Board getting 10v.

So input margin will between 2v to 2.2v right from figure 3.

so does this mean i should apply the input voltage between 0 to 7.8v.

0 Praveen Aroul over 5 years ago in reply to VISHAL KALWANI

Hi Vishal,

Can you measure the IDRV current on your board and sweep the input voltage between 0 and 7.8V?

0 Praveen Aroul over 5 years ago in reply to Praveen Aroul

Hi Vishal,

Since I have not heard back from you, I am assuming you were able to resolve the issue and so I am closing the post.

If you still have any pending questions, please feel free to post them here.

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