Post Go back to editing

Using Single ended analog input in AD7356

Hi,

I'm planning to use AD7356 IC in my board design, but I need to provide single ended analog signal as the input for monitoring. As per the Data sheet and Application note related to the IC, it is suggested that I may have to include a single to differential converter as well as an OP-AMP buffer ( for Vocm input) for the single to differential interfacing. If planned so I need to add two single to differential converters and two more OP-AMP buffers - as I need to monitor two single ended analog signals. The problem is - I have space constraints in my board and incorporating these many components into it is not at all possible. Can anyone suggest any alternate method for using my single ended signal directly into that IC ( without any buffers or converters)? What if I connect my single ended input directly to the Vin+ of the IC (AD7356) and connect the Vin- pin to ground? Is there any problem if I do so? 

Kindly suggest any methods/  measures so that I can proceed with my design.

Thanks in advance,

Janani.

  • Hi Janani,

    AD7356 is a differential input SAR ADC. Thus, it needs to have differential signal as input and since it is a SAR ADC, it needs to have buffer to drive the internal DAC capacitors. Based on your requirements, you need only a single or pseudo differential ADC so I would recommend AD7866. it is a dual 12-bit high speed, low power, successive approximation ADC. The part operates from a single 2.7 V to 5.25 V power supply and features throughput rates up to 1 MSPS. Similar with AD7356, it contains two ADCs. But since this is a SAR ADC, you need to have two buffer to drive the two ADCs.

    Regards,

    Daryl

  • This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

    Thank you,
    EZ Admin