AD9213S
Recommended for New Designs
The AD9213S-CSH is a single, 12-bit, 10.25 GSPS, RF analog-to-digital converter (ADC) with a 6.5 GHz input bandwidth. The AD9213S-CSH supports high dynamic...
Datasheet
AD9213S on Analog.com
(1) AD9213's datasheet states that the internal VREF = 0.5V, corresponding to the maximum input voltage Vp-p is 1.4V, it seems that these two values are not related. Theoretically VREF directly determines the ADC input range, and it seems more reasonable to have VREF=0.7V for a differential input range Vp-p of 1.4V, here because of the voltage conversion done?
(2) In addition, the port VREF is connected out on the evaluation board, and we measured the voltage of VREF on the evaluation board drifting between 0.1V~0.25V, is it possible to accurately measure this VREF, or to increase the maximum input voltage range Vp-p by external voltage VREF=0.6V?
Hello,
While scaling factor of 1 or 2x of VREF is often the case.......it need not be that always and can be set by changing gain setting resistors as shown on some other ADC's below. While the AD9213 has a different implementation (i.e. R2/R1 resides is fixed and resides inside the device).............the example below shows that it is possible to have a full-scale input of 1.4 Vpp while having a 0.5 V VREF.
Hello,
While scaling factor of 1 or 2x of VREF is often the case.......it need not be that always and can be set by changing gain setting resistors as shown on some other ADC's below. While the AD9213 has a different implementation (i.e. R2/R1 resides is fixed and resides inside the device).............the example below shows that it is possible to have a full-scale input of 1.4 Vpp while having a 0.5 V VREF.
