DAC11001B: Glitch, Temperature calibration, ROFS|RFB matching

Hi Jens,

Please check my response below - 

Jens Reimann said:

How long does the temp calibration process take typ. and worst case?

[Sanjay] >>  It's ~2.5ms typical. 

Jens Reimann said:

How good is the matching of the ROFS|RFB resistors and woutd it make sense to include this value in the electrical characteristics section of the datasheet (or did I just miss it)?

[Sanjay] >>  Here is typical device data (there is no spec for this though)
DUT#1 - 
R(ROFS-RCM) = 5.2128k ohm & R(RCM-CFB) = 5.2034k ohm

DUT#2 - 
R(ROFS-RCM) = 5.1208k ohm & R(RCM-CFB) = 5.1110k ohm

DUT#3 - 
R(ROFS-RCM) = 5.1982k ohm & R(RCM-CFB) = 5.1901k ohm

The matching error is in range of 0.156% to 0.191%

Jens Reimann said:

Looking at Fig.  6-31 and 6-32 the glitch occures roughly 1.4us after the falling edge of LDAC. I wonder why this is so late. What setting of UP_RATE was used for these figures and I would be very interested to see what UP_RATE=01 look like?

[Sanjay] >> Let me check and will get back to you by early next week.

Thanks,
Sanjay

Hi Jens,

Regarding the Fig.  6-31 and 6-32 on glitch - 
1. 1.4us times is combination of digital operation and TNH circuit (track and hold). 
2. In this case the UR_RATE is = 0x10 (lowest update rate.
3. Setting the UR_RATE = 0x01 would not have any wors impact on the glitch energy (it would reduce the time between the two large flitch Fig. 6-31). But it will degrade the dynamic performance i.e. - THD of this device.  



Di let us know for any further help.

Thanks,
Sanjay