AD7740 Output frequency instability

Hi Ranjit ,

The AD7740 requires a stable clock source with a frequency range of 32 kHz to 1 MHz and a duty cycle between 40:60 and 60:40. Since you're using a 1 MHz clock from a microcontroller, ensure that the clock signal meets these requirements. Any deviation in frequency or duty cycle can cause instability in the output frequency.

While using an external clock applied to the CLKIN pin is valid, better stability may be achieved by using a crystal oscillator connected between the CLKIN and CLKOUT pins. The on-chip oscillator, when used with a crystal, provides a stable clock signal, which can help improve the performance of the voltage-to-frequency conversion.

Thanks,
Francis

Hi Ranjit ,

The AD7740 requires a stable clock source with a frequency range of 32 kHz to 1 MHz and a duty cycle between 40:60 and 60:40. Since you're using a 1 MHz clock from a microcontroller, ensure that the clock signal meets these requirements. Any deviation in frequency or duty cycle can cause instability in the output frequency.

While using an external clock applied to the CLKIN pin is valid, better stability may be achieved by using a crystal oscillator connected between the CLKIN and CLKOUT pins. The on-chip oscillator, when used with a crystal, provides a stable clock signal, which can help improve the performance of the voltage-to-frequency conversion.

Thanks,
Francis