Dac Driver ready

This picture shows the pic 16F877 board. It worked till I tried to reprogram it. The PIC is dead since.

Software development continues on a 16F84 board. I put one of the DAC chips on that board. Then I wrote a driver for it. This was not hard to do.

The DAC uses a 3 wire serial bus. The protocol is simple. I uses 4 control bits, 10 databits and 2 don't care bits. Sending these bits to the Dac can be done fast. I made a sawtooth generator as test project . The resolution is 10 bits the period is 2Hz. If the PWM sawtooth generator won't met the expectations I can fall back to this one.

I have to wait for the arrival of the new 16F877 chips. Until then I will work on the analog board. That board will adjust the amplitude of the sweep signal. It will also add the center frequency offset and the centerfrequency regulation voltages.
I may put a linearization circuit on this board.