DRV2700: DRV2700 input use DAC instead of RC

zhang ping

Part Number: DRV2700

The RC here is implemented by two schemes, one is the active third-order filter built by operational amplifier, and the other is DAC AD5660. Now the phenomenon is that the output of AD5660 will be abnormal. What is the reason?

over 6 years ago

0 Luis Fernando Rodriguez S. over 6 years ago

TI__Guru* 84915 points

Hi, Zhang,

The RC filter shown in the picture above is used only for PWM signals. The PWM signal used as the DRV2700 input is normally around 30KHz. The RC filter is suggested to eliminate the out-of-band signal content and its audible noise (due to the harmonics). If the AD5660 doesn't use a PWM output, the RC filter is not required.

Best regards,
Luis Fernando Rodríguez S.

0 zhang ping over 6 years ago in reply to Luis Fernando Rodriguez S.

Genius 3835 points

DRV2700 uses a single-ended input mode. What is the input requirement? I used the AD5660 output as DRV2700 input, but the DRV2700 output was abnormal.

0 Luis Fernando Rodriguez S. over 6 years ago in reply to zhang ping

TI__Guru* 84915 points

Hi, Zhang,

The DRV2700 supports either a DC, AC or PWM input. The recommended voltage is 1.8V peak. Regarding the output behavior, it actually depends of the signal frequency and the output capacitance as shown in figures 9-12 ( http://www.ti.com/lit/ds/symlink/drv2700.pdf#page=7 ). I recommend to take a look at all these parameters for your application.

Do you have details about the output? What is the abnormal behavior that you are getting?

Best regards,
Luis Fernando Rodríguez S.

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DRV2700: DRV2700 input use DAC instead of RC