Hi, I'm working on an analog to frequency converter based on AD654. I have a problem because the input signal (coming from a uP board D/A converter) always generate a minimum 5 mV DC which generate output pulses out of my AD654... This circuit is used to control a Step Motor drive and I should have a zero pulse output.
First solution is to have a 10 mV offset circuit at the input. Second solution is a comparator which shot down the output when the input is under 5-10 mV (precision is not very important).
Any other solution welcome.
- I only have single supply available for this circuit +24V or +5V
- No place for potentiometer on the board
- I have 1/2 LM358 Opamp available
I'm not familiar with these small DC analog signals. If you can help, I will appreciate.
Michel
First solution is to have a 10 mV offset circuit at the input. Second solution is a comparator which shot down the output when the input is under 5-10 mV (precision is not very important).
Any other solution welcome.
- I only have single supply available for this circuit +24V or +5V
- No place for potentiometer on the board
- I have 1/2 LM358 Opamp available
I'm not familiar with these small DC analog signals. If you can help, I will appreciate.
Michel