**Part Number:**CD74HC4046A

**Other Parts Discussed in Thread:**CD4046B, SN74LV4046A

Hi,

my customer has the following question:

I* would like to implement a HC4046 in one of our circuit designs to monitor a voltage and convert it into a frequency. So I just need the VCO of the integrated circuit.** Looking for equations to calculate the frequencies I need. I found just something for the CD4046B. But the calculated value is different from the measured and indicated values in the HC4046 datasheet. Another problem I couldn't understand the 400kHz Offset frequency which is indicated for R2=220kOhm and C1=1nF (page 11) but in the diagram in figure 28 this isn't possible because a value between 150k and 1,5M should be a offset frequency between 10kHz and 100kHz. So my question is how I could calculate the estimated frequency for a dedicated setup and as well estimate the error for part tolerances?*

The customer has already seen the following threads:

https://e2e.ti.com/support/logic/f/logic-forum/907678/sn74lv4046a-how-to-design

Thanks

Jan