LM567C: LM567C Oscillator - Value for C2?

ee tech said:

Part Number: LM567C

Hi

I have an LM567C on the test bench running as an oscillator (Figure 18). R1=2.4k 1%, C1=3.2n, C2=(any value between 4.7n and 10n). Fo = 137.5Khz.

This is configured as an oscillator. Is there a specific value I should use for C2?

thanks

In addition, The values shown for the circuit in section 11.2.5 "AC test Circuit" do not match the frequency shown (100Khz).

Are the values correct? If so Why?

thanks

Hello, 

The C2 selection should be made with regards to the desired bandwidth. I have put the parts of the datasheet below that go over the requirements / selection. 

With regards to section 11.2.5, a note is made there to emphasize that it does not show values for fo = 100 kHz. C1 needs to be updated. 

Regards, Amin

Hi

The circuit in Figure 18 is not configured to lock on an input signal frequency. It is simply an oscillator.

But figure 18 also shows C2 which sets the bandwidth. Why is this needed if there is no need for a capture range?

If its needed, why? and what value should I use?

thanks

Hello,

These are LM567C are older devices and there is no expertise remaining within the business unit to support technical questions on these devices.

I am sorry for the inconvenience.

Regards,