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About AD1674 Reference Circuit

Category: Hardware
Product Number: AD1674TD/883B


I have been using the AD573, but since it is a newly developed deprecated product, So I have been looking for an alternative, and the AD1674TDseems to work.

(I chose the AD1674TD because it must support a temperature range of -55°C and ±5 V input.)

However, the AD1674 datasheet does not include a reference circuit. There is no evaluation board either.

Are there any reference circuits or documents that can be used as a reference for the design?

I posted the same thing in the Reference Designs column first, but I was advised to post it in the Precision AD Converter column.



  • Hi Kazu,  

           There are no available evaluation board and reference design for AD1674. The available resource for a design is figures 11 and 12 in the AD1674 datasheet. The device has been in the market for a long time. Are you designing new application? We have newer that qualifies for -55 temperature, example AD7980, AD7981 or MAX176. These parts have available reference design and evaluation boards. I suggest designing the new application with newer parts. Are there other factors or requirement for the ADC aside from the -55C temperature?



  • Hi Jonathan,

    Thank you for the prompt reply.

    In addition to the lower limit of operating temperature: -55°C, the required specifications are as follows

    - Analog signal input: -5 to +5V

    - Resolution: 10 bits or more

    - AD conversion time: 30us or less

    Please let me know if you have a product that meets the above requirements. Thank you in advance.



  • Hi Kazu,

    I recommend using an analog front end which is the ADA4625-1 to shift the level from -5V - +5V to 0V - 5V to drive the AD7691 which is an 18-bit, charge redistribution, successive approximation, analog-to-digital converter (ADC) that operates from a single power supply, VDD, between 2.3 V and 5 V.

    Here is the schematic below that will be connected to the driven ADC.