REF3112: Request for Circuit Diagram Review

Hello,

I would recommend to pay close attention to the load capacitor selection. The REF31xx-Q1 does not require a load capacitor. If a load capacitor is used, it is recommended to use one with an ESR of at least 0.5Ω. (see section 8.1 of the datasheet). For the bypass capacitor on the input, I would recommend 0.47µF (see section 8.3 of the datasheet)

I would recommend using our new device, REF30E, which is a drop in replacement with performance improvements when compared to REF31. Please find information here:

https://www.ti.com/product/REF30E 

Full part number: REF3012EAIDBZR

Thanks,

Jackson

Hello, 

I would make sure to also take a look at the resistance up to 1 kHz to account for capacitor tolerances and variance. The ESR of GCM155D70E106M does seem to be getting a little low around that frequency. You might be fine depending on the resistance of the PCB trace, but just being cautious, I would suggest either considering a capacitor with a slightly higher ESR or adding a resistor in series with GCM155D70E106M. 

Thanks,

Jackson

Hello,

The output behavior for REF31 when it comes to power on and transients varies depending on the output capacitor. Pages 8-9 of the REF31-Q1 datasheet have figures which provide more detail.

Additionally, some ADC or DAC reference pins have capacitance requirements to also take into account. 

Thanks,

Jackson