Selecting an 8 bit DAC

[tejashs]

hello,
i need a 8 bit dac for my college project,
i saw some DAC's on internet.
But they require a negative power supply. and i need one that works only on +5 volts only
(single supply).
is there any DAC IC(must be easily available). or should i make an R2R ladder DAC using discrete resistors......
which is better......????
the application is not too much dependent upon accuracy, a little error is tolerable i think

 

[Sanchayan]

**broken link removed**

Digital to Analog Converter - Precision DAC (=<10MSPS) - TLC5615 - TI.com

How about these? It's a 10 bit DAC though. You can order 5 free samples after registering on their website. DAC's working on 5V only shouldn't be really hard to find. Try other vendor sites as well like Analog Devices.

 

[tejashs]

i think from the above suggestion tlc5615 might be enough
Digital to Analog Converter - Precision DAC (=<10MSPS) - TLC5615 - TI.com
does anyone know if its available in India, Bangalore?

 

[papunblg]

Are you sure that you can handle 3 line serial interface of TLC6515 ?

Use DAC 0808. There are tons of tutorial vailable. Have you ever search google for TLC6515 circuits? The DAC0808 will interface directly with popular TTL, DTL or CMOS logic levels, and is a direct replacement for the MC1508/MC1408. Easy to use and low price.

Tutorial Microcontroller MCS-51 ATMEL ISP

https://www.physics.wisc.edu/undergrads/courses/fall2011/623/ds/MC1408-dac.pdf

 

[poorchava]

You don't even need an IC. You can make a DAC yourself using a microcontroller and R-2R ladder. You'll just need to add some cheap rail to rail amplifier to buffer the voltage.
Look at wikipedia for 'resistor ladder'.

As for ICs I'd use MCP4801/MCP4802. Those have internal bandgap reference voltage of some easily dividable value (like 8 mV / LSM or similiar) and are driven by SPI which is included in almost all MCus and also very easy to bitbang with those MCUs that don't have it.

 

[tejashs]

but DAC 0808 requires VEE other than +5V i think i havent seen any ckt on google whithout it. (it requires a negative VEE)