Is there any suggested part to compete AD7740YRMZ-REEL7?

Hi Aki,

Thank you for reaching out. The competitor device requires an external clock source to operate and TI currently only offers asynchronous voltage-to-frequency converters such as the  VFC320 with high linearity at 1MHz. Rather than utilizing a clock source, these devices simply use two resistors and two capacitors to operate. If the customer does not require synchronous operation please visit the following page for more devices:

http://www.ti.com/amplifier-circuit/special-function/frequency-converters/products.html.

I hope that this helps answer your question.

Best,

Daniel