adr1001 BUF_F pin

Question

I saw the "SHORT-CIRCUIT CURRENT LIMIT" in the datasheet of ADR1001. Could anyone tell its detailed meaning to me? 
 Moreover, is it safe to short the BUF_F pin to GND or VCC? In other words, can the BUF_F pin be connected to GND or VCC through a small resistor (for example,10m&Omega;) for a short period (about 10 seconds) without causing permanent damage? (For example,when using it as a calibration source, accidentally shorting two connectors.) 
 More specifically, when the op amp output is shorted to the ground or source, the op amp will still work because the short-circuit protection. And its current is given in the "SHORT-CIRCUIT CURRENT" of the datasheet. Some op amps can even be shorted for long time. However, in the ADR1001 datasheet, I found that it has an extra "LIMIT", which caused me confused.

BrendanWhelan · Accepted Answer

The BUF_F output is protected from damage in overcurrent conditions, this is why it has a short-circuit LIMIT. It is not likely to damage ADR1001 from a brief short-circuit, however this condition should be limited in both power dissipation and time. The current protection does not stop the IC from heating, and at maximum current and voltage, ADR1001 will heat substantially. This will pull it out of thermal regulation, causing drift in the reference voltage. 
 If shorted for more than a few milliseconds, I expect there to be a notable die temp rise. It will take time for the die to cool and return to thermal regulation. Vout may not be within specification in such a condition until the thermals settle again. 
 If die temp rises above abs max, lifetime and performance may be affected. 
 If die temp rise is significant, it may cause some thermal hysteresis or additional long-term drift.)

Partner Forums

Partner Libraries

adr1001 BUF_F pin