AD9361 1.3V range in 1.267V ~ 1.33V, tolerance only 2.5%.
If use ADP1755 to design,
Looks like all of tolerances depends on external resistor, ADP1755 ADJ has no any tolerances, right?
As far as adjustable voltage LDO tolerances, if you look at a datasheet, you will see that the output voltage is a function of input voltage, load, temperature etc... This is all in addition to the resistive feedback network tolerances.
You need to make sure that the supply voltage holds up over temperature and over the whole range of the LDO input voltage.
The LDO you are using is an adjustable output voltage LDO. Can you adjust the feedback network such that your 1.3V is within specification? The adjustment would involve selecting different resistor values.
For adjustable output version Vout=Vref*(1+Rtop/Rbot), therefore the tolerance of the Vref, which is 1% as shown in the spec table, affects the accuracy of Vout as well. For better output voltage accuracy, noise performance and PSRR, use the fixed output voltage version ADP1754ACPZ-1.3-R7 for example.
Thanks for your answer,
We have use TI LP38852 LDO to provide 1.3V for AD9361,
When power VDD1P3 load up to 1A, the 1.3V will down to 1.260V~1.264V that seems to over AD9361 SPEC.
Does it casue any potential side effect and performance issue of AD9361?
As project schedule tight, we may can't modify schematic to use ADP1755,
Please kindly give me some suggestions to find tuning this issue.
Retrieving data ...