What is the jelly bean DAC du jour?
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Posted by Joerg on November 8, 2006, 2:04 pm
Please log in for more thread options Hello Folks, Haven't used DACs in a while, did it with PWM all the time. Now I need to design something that requires lots of low noise DC levels to be set. What is the common jelly-bean 8-bit multi-DAC with a serial bus these days? The requirements would be the usual. Multi-sourced if possible, lots of channels, under 50c/channel or at least under $1/channel, 8 bits or more, serial bus with two or at the most three wires, speed can be in the low kHz range. A chip select would be nice but that could also be handled by gating logic. I have seen some nice octal 8-bitters like the TLC5628 which unfortunately needs an extra load command line (but that would be ok). Don't know whether that one is a mainstream part and I want to avoid settling for a boutique part, which is why I am asking. Then there'll be the challenge to bus the data to several dozen modules with the DACs on them but that's a whole 'nother matter. Got to wait until the guys tell me what the bus is going to be. Hopefully nothing that needs lots of arbitration. -- Regards, Joerg http://www.analogconsultants.com | |||||||||||||||||||||||||
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Posted by on November 8, 2006, 6:50 pm
Please log in for more thread options On Wed, 08 Nov 2006 19:04:54 GMT, Joerg >The requirements would be the usual. Multi-sourced if possible, lots of
>channels, under 50c/channel or at least under $1/channel, 8 bits or >more, serial bus with two or at the most three wires, speed can be in >the low kHz range. A chip select would be nice but that could also be >handled by gating logic. > >I have seen some nice octal 8-bitters like the TLC5628 which >unfortunately needs an extra load command line (but that would be ok). >Don't know whether that one is a mainstream part and I want to avoid >settling for a boutique part, which is why I am asking. > >Then there'll be the challenge to bus the data to several dozen modules >with the DACs on them but that's a whole 'nother matter. Got to wait >until the guys tell me what the bus is going to be. Hopefully nothing >that needs lots of arbitration. | |||||||||||||||||||||||||
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Posted by on November 8, 2006, 6:54 pm
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sdeyoreo@hotmail.com wrote: > On Wed, 08 Nov 2006 19:04:54 GMT, Joerg
> > >Hello Folks,
> > > >Haven't used DACs in a while, did it with PWM all the time. Now I need > >to design something that requires lots of low noise DC levels to be set. > > > >What is the common jelly-bean 8-bit multi-DAC with a serial bus these days? > > > LTC1090. 2 wire I2C bus, 8 ch.
Wow, those are $12-$25 each from Digikey. | |||||||||||||||||||||||||
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Posted by Joerg on November 8, 2006, 7:13 pm
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sdeyoreo@hotmail.com wrote: > On Wed, 08 Nov 2006 19:04:54 GMT, Joerg
> > >>Hello Folks,
>> >>Haven't used DACs in a while, did it with PWM all the time. Now I need >>to design something that requires lots of low noise DC levels to be set. >> >>What is the common jelly-bean 8-bit multi-DAC with a serial bus these days? >> >
> LTC1090. 2 wire I2C bus, 8 ch. > > Thanks. It is a bit on the pricey side, probably because it's 10-bit. -- Regards, Joerg http://www.analogconsultants.com | |||||||||||||||||||||||||
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Posted by Spehro Pefhany on November 8, 2006, 7:25 pm
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On Wed, 08 Nov 2006 19:04:54 GMT, the renowned Joerg >Hello Folks,
> >Haven't used DACs in a while, did it with PWM all the time. Now I need >to design something that requires lots of low noise DC levels to be set. > >What is the common jelly-bean 8-bit multi-DAC with a serial bus these days? > >The requirements would be the usual. Multi-sourced if possible, lots of >channels, under 50c/channel or at least under $1/channel, 8 bits or >more, serial bus with two or at the most three wires, speed can be in >the low kHz range. A chip select would be nice but that could also be >handled by gating logic. > >I have seen some nice octal 8-bitters like the TLC5628 which >unfortunately needs an extra load command line (but that would be ok). >Don't know whether that one is a mainstream part and I want to avoid >settling for a boutique part, which is why I am asking. > >Then there'll be the challenge to bus the data to several dozen modules >with the DACs on them but that's a whole 'nother matter. Got to wait >until the guys tell me what the bus is going to be. Hopefully nothing >that needs lots of arbitration. You might do better price-wise with a digital pot than a conventional DAC. Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com | |||||||||||||||||||||||||
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>
>Haven't used DACs in a while, did it with PWM all the time. Now I need
>to design something that requires lots of low noise DC levels to be set.
>
>What is the common jelly-bean 8-bit multi-DAC with a serial bus these days?
>