Post by thread:R-2R resistor netwoks.

Sorry whoever sent the message about the R-2R sip networks. I lost the original post, but remembered the resistors. (I'm down to a one finger keyboard operation for a while.) :( I feel sure you will find what you are after in the digikey catalog. have a look at the 'bourns' resistor netwoks, at Fig G, dual term. They have a 10 pin device with zero ohms at the correct pins and what appears to be the correct R and 2R values in the resistor ladder. All you need it the 10K version for that DAC to PIC circuit. Don McKenzie spam_OUTdonTakeThisOuTdontronics.com http://www.dontronics.com PICSTART and Newfound PIC Programmers Firmware Upgrades. SLI, the serial LCD that auto detects baud rates from 100 to 125K bps. SimmStick(tm) A PIC proto PCB the size of a 30 pin Simm Memory Module. Send a blank message to .....infoKILLspam@spam@dontronics.com for more details.

> I feel sure you will find what you are after in the digikey catalog. > have a look at the 'bourns' resistor netwoks, at Fig G, dual term. > They have a 10 pin device with zero ohms at the correct pins and what > appears to be the correct R and 2R values in the resistor ladder. > All you need it the 10K version for that DAC to PIC circuit. There are two uses for R/2R resistor networks: line termination and digital-to-analog conversion. A network set up for the former will bias a bunch of signals at 1/3 rail. This may be used either to terminate certain types of communications lines, or as part of a "poor man's" multiplex LCD circuit. Unfortunately, it won't be much use for the latter application (D/A conversion). As far as I'm aware, neither Digi-Key, nor Mouser, nor Jameco have any SIPs of the latter type.