I'm using AD8542 to create relaxation oscillator with the schematic below
But it has problem with temperature. Frequency out is drift about 4-5Hz/*C.
Can you help me to reduce this effect?
Thank Harryh for your reply.
I used NP0 type capacitor and resistor with 25ppm/*C.
Can you suggest partnumber of suitable opamp to replace AD8542?
I will try and show the results later.
I've tried with AD8535 and AD8552 but the problem is not fixed.
The output is still effected by temperature. And I found new problem.
With the same circuit (just change opamp), there are the different frequency output
- With AD8542: Fout ~ 5050Hz, drift about 4-5Hz/*C
- With AD8552: Fout ~ 4800Hz, drift about 5-6Hz/*C
- With AD8538: Fout ~ 5170Hz, drift about 4-5Hz/*C