TLV3501: design questions about TLV3501

Hi Jimmy,

Could you tell us more about your application and system requirements? Where is the comparator being used in this structure? to generate the 3.3V sq wave clock? And what would be the input signals that goes into the comparator?

Hi Chi,

We appreciated your great support.

1. Square wave to sine wave:
sqr2sin is to solve the square wave EMI low frequency harmonics 30/50/70/90Mhz, please provide suggestions on this part, thank you!

2. Design the comparator to support 1.2V and 5.5V 1PPS input swing:
Output will go to WANPLL, the requirement is 3.3V swing@ 1PPS, Vmin=0
The original design uses SN74AUP1T17, because the delay and VT+=1.19 (if the input is 1.2, the margin will be very large), so I want to use the comparator design
Do you have any suggestions for reference, thank you!

Many Thanks,

Jimmy

Hi Jimmy,

I am assuming that you meant the input could be from 1.2V-0V or 5.5V-0V. Is 50% duty cycle required?  IF so, I am not sure this is doable as the reference of the comparator will need to be set to the midpoint of the input signal; but this would be limited by the 1.2V signal and midpoint of 1.2V would not be the midpoint of the 5.5V signal. For example, the reference could be 0.6V and the output will be 50% duty cycle if the signal is 1.2V but the comparator output would not be 50% for a 5.5V signal. If 50% duty cycle is not needed, then this could work, but you would need to divide down the input signal to accommodate for the 5.5V signal as the comparator is being powered by 3.3V.