About AD1674 Reference Circuit

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?

Regards,

Jonathan

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.

Regards,

Kazu

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, V_DD, between 2.3 V and 5 V.

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

Regards,

Andrei