Other Parts Discussed in Thread: LMV611
Hi team,
The customer is using LMV321. He uses the voltage follower to design a digital potentiometer.
VCC is 5V single power supply. He uses 0~5V pulse signal as the input signal. He needs the output voltage is also 0~5V.
The schematic and the input pulse signal are in the attachment.
His problem is only 1/3 of LMV321 devices can output 5V voltage. Others can only reach 4.45V.
I uses TINA to simulate his circuit. I note if the input voltage is 0~5V, the output voltage can also be 0~5V.
But the datasheet shows the max input common voltage is 4.2V when VCC is 5V. And the output voltage is about 300mV~400mV swing.
My understanding:
For the customer's problem, because of the input common voltage range limitation,the output voltage range limitation
and VCC voltage limitation, the output voltage can only reach 4.45V.
If it is this reason, would you recommend a suitable device and a suitable VCC to meet the customer's requirement?
Why 1/3 of LMV321 device can output 5V?
Best Wishes,
Mickey Zhang
Asia Customer Support Center
Texas Instruments
