Hi team,
Could you tell how to deal with NC-pins?
Looking at figure 72 of the datasheet, all NC-pins are connected to RTN Plane, but looking at P.3 of the user's guide, 11 & 21 pins are open. Need to understand the correct way.
Could you also tell the value of R_PU of SHDN-pin?
Regards,
Noriyuki Takahashi
Hi Noriyuki,
Thanks for reaching out to us. Pin 11 and 21 can also be connected to RTN to achieve better thermal performance. There is no issue.
Regarding R_PU, are you taking about this resistance? If yes, it's internal to the device. We don't have access to this. May I know why this value is required?
Avishek,
Yes, they want to know it.
They want to confirm whether the voltage level of the SHDN-pin will be low enough, even if they add a switch circuit that is connected to SHDN-pin. The switch circuit has a certain resistor. That's why they need to understand it.
Could you also tell the value of AVdd as below?
Regards,
Noriyuki Takahashi
Hi Noriyuki,
The SHDN/ pin equivalent circuit is shown below. With high value of resistance at SHDN/ pin, the voltage at SHDN/ pin will be limited to 2.7V (typ) by the internal clamp circuit. As the external resistance at the SHDN/ pin decreases, the SHDN/ pin voltage follows the ohms law with AVdd = 4.275V and Rpu as 700k+200k
Best Regards, Rakesh
