Other Parts Discussed in Thread: ADS8864,
Hi experts,
My customer was evaluating ADS8664 and found ADS8864 is easy to reset 。 could you please check their design and help to comment how to improve this ?
thanks.
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Dale,
They also use a MCU Io to control the RST of ADS8664. but they don't think it was caused by MCU. This happened in their end customer and the input range changed. for example, they set to +-10V at the beginning , but after running for a period of time, it changed back to default 0-5V. If MCU reset, it should set the ADC parameters back.
They think the RST timing of ADS8664 is too short according to the datasheet, only 400ns, and they also tried to increase the RC value, but can't be completely avoided.
They wonder if there is a SW approach to increase the RST timing or mechanism to avoid this happen[MCU not reset, but ADC doest]
Hello Yue Tang,
Since a logic low state on the /RST/PD pin is required to implement a reset, so this pin should be connected to logic high (DVDD), a good example is shown on the EVM board. Hence, R263 is suggested to connect to DVDD instead of GND_AD. Also, extend the low pulse time longer than 400ns for expected reset if it is possible to change.
Best regards,
Dale