I'm examine two parties of AD5660ARJ-1 (about 20 units same kind) with SOT-23 packaging
label D30 (AD5660ARJ-1) and D5G (AD5660ARJZ-1) - both must have 1.25V internal reference,
but at pin 2 they demonstrate 2.5V. At output pin, with writed code
0x3fff, some about 1.25V with temperature depend about 1mV per gradus
C (400ppm vs declared 5ppm).
Please see applied picture for aplication shem.
What would your recommend?