Hi,

For my project i need to use the dac0800lcn from futurlec and interface it with a pic18f452. I read the datasheet but i don't know what external components i have to use to connect it differentialy to a lm386n-3 and connect the 5v data pins to the pic pins of portc.
Moreover my pic is supplied with 5v throoug a voltage regulator 78l05.
There is a 10v reference used for dac0800 in the datasheet. Unfortunately i run the application from 9v battery so there is no way using 10v.
Could anyone give me some clues?
I even don't know if this dac is suitable for my needs which is to play a 8 bits 44khz sample from a spi eeprom...
Thanks

 

You might check, but I think the DAC0800 is an 8 bit Analog to Digital converter. You need to go the other way, with a Digital to Analog converter.

Is that file mono and only 8 bits resolution?

 

...but I think the DAC0800 is an 8 bit Analog to Digital converter. ...

Actually the first 3 letters tells you that it is Digital to Analog

 

Missed that - I'm so used to seeing questions on the ADC0800.

 

Yes, DAC--- is DAC

Is that file mono and only 8 bits resolution?

-> Mono, 8bits, yes.
The datasheet is available here:
http://www.national.com/mpf/DA/DAC0800.html

What do you think, guys?

 

The DAC0800 isn't specified for unipolar operation. +/- 4.5 volts seems to be the minimum. If you read the application notes, you will see a setup that lets you run the output through resistors so you don't need a differential input to the amp.

 

The DAC0800 isn't specified for unipolar operation. +/- 4.5 volts seems to be the minimum. If you read the application notes, you will see a setup that lets you run the output through resistors so you don't need a differential input to the amp.

By saying unipolar, you mean supplying the IC with a battery.
Okay, this DAC is not suitable. There are good SPI DACS but unfortunately I can't get them from Futurlec. I'll try something else or check the other DAC they have at futurlec.

Thanks

 

If you can supply it with +/- 6 volts, it might work.

 

Whatever you do, it will sound like crap if you take 16-bit data (from a CD) at 44.1 kHz and replay it as 8-bit data at 44.1 kHz.

If the sampled data is 8-bit data then it will prbably still sound pretty awful. You should be aware that audio systems use 20-24 bit DACS at a minimum.