DAC0808 circuit parameters

[miketan3904]

Hi. I wanted to use DAC0808 for my project but I couldn't find any resources on how to choose the value for the voltages and resistors value. There is a circuit being provided in the page 4 of the datasheet and I followed all the settings in the datasheet except I used LM358N to replace the op amp in the schematic diagram. I have a few questions below:
1. Does anyone knows if the -15V at the VEE is compulsory and could it be some other voltage?
2. When I use the setting in the circuit, I only get half of the expected output voltage. For example, I only get 5V when I expect 10V at the output. Does anyone know the reason for this?

Datasheet: https://www.ti.com/lit/ds/symlink/dac0808.pdf?ts=1637242773375

[CaptDon]

I think the National Semiconductor original data book had some excellent info and diagrams. I used the DAC0808's all the time and had great luck with them. I am currently using a pair to generate sine/cosine signals to form circular traces on a radar system. I generated the truth tables by hand but also found an online calculator where you program the number of bits and number of steps and it will generate the binary truth table for you. The book explains the scaling, offset from zero if desired, and overall gain. If I remember, the 0808 is designed as a variable current source, not a variable voltage source, so some external circuitry will convert the current output to voltage output, thereby requiring the opamp you mentioned with inverting feedback to set gain.

[miketan3904]

From your experience of using it, have you tried to use other value of VEE like connecting it to ground? I was trying to modify the circuit without affecting the operation too much so that I can easily use the power supply that I have.