The Rohm BH226F. If it's any good, it could replace a lot of PWMs. https://www.digikey.com/short/qptnn7 Anybody used them? Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net https://hobbs-eo.com
Octal eight-bit DAC for 80 cents
Started by ●February 21, 2018
Reply by ●February 21, 20182018-02-21
On 02/21/2018 10:22 AM, Phil Hobbs wrote:> The Rohm BH226F. If it's any good, it could replace a lot of PWMs. > > https://www.digikey.com/short/qptnn7 > > Anybody used them? > > Cheers > > Phil Hobbs >The settling time and and integral nonlinearity specs are very Meh; 100uS (Min) - jeez, for real? I think the TI quad DAC08 variants with SPI like D084S085 are pretty nice for a buck
Reply by ●February 21, 20182018-02-21
On 02/21/2018 10:58 AM, bitrex wrote:> On 02/21/2018 10:22 AM, Phil Hobbs wrote: >> The Rohm BH226F. If it's any good, it could replace a lot of PWMs. >> >> https://www.digikey.com/short/qptnn7 >> >> Anybody used them? >> >> Cheers >> >> Phil Hobbs >> > > The settling time and and integral nonlinearity specs are very Meh; > 100uS (Min) - jeez, for real?Well, it's to replace a bunch of PWMs. ;)> > I think the TI quad DAC08 variants with SPI like D084S085 are pretty > nice for a buckThose are nicer, for sure, but twice as much money. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net https://hobbs-eo.com
Reply by ●February 21, 20182018-02-21
Reply by ●February 21, 20182018-02-21
On 02/21/2018 04:08 PM, Winfield Hill wrote:> Phil Hobbs wrote... >> >> The Rohm BH2226F. > > BH2221 12-channels. > >Have you used it for anything? Thanks Phil -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com
Reply by ●February 21, 20182018-02-21
On 02/21/2018 03:43 PM, Phil Hobbs wrote:> On 02/21/2018 10:58 AM, bitrex wrote: >> On 02/21/2018 10:22 AM, Phil Hobbs wrote: >>> The Rohm BH226F. If it's any good, it could replace a lot of PWMs. >>> >>> https://www.digikey.com/short/qptnn7 >>> >>> Anybody used them? >>> >>> Cheers >>> >>> Phil Hobbs >>> >> >> The settling time and and integral nonlinearity specs are very Meh; >> 100uS (Min) - jeez, for real? > > Well, it's to replace a bunch of PWMs. ;) > >> >> I think the TI quad DAC08 variants with SPI like D084S085 are pretty >> nice for a buck > > Those are nicer, for sure, but twice as much money. > > Cheers > > Phil Hobbs >I use the ATTiny85 as a "general purpose low-frequency thing building block" that's under a dollar, I got this software suite that lets you drag-and-drop functional blocks like clocks, counters, PWM outputs, etc. "wire" them up into a system, assign port numbers, push a button and it generates C++, compiles it and uploads it to the uP for testing in under 30 seconds. The Rohm chip might make a good team with the ATTiny, the main flaw in a lot of applications is it only has three hardware PWM outputs on fixed pins, one of which ties up an ADC channel if you use it. Stepping up to a core with any more than three hardware PWM channels is a significant increase in footprint and price
Reply by ●February 21, 20182018-02-21
Phil Hobbs wrote...> > Winfield Hill wrote: >> Phil Hobbs wrote... >>> >>> The Rohm BH2226F. >> >> BH2221 12-channels. >> > Have you used it for anything?Not that one, but other Rohm stuff, I'm happy to believe their specs. -- Thanks, - Win
Reply by ●February 21, 20182018-02-21
bitrex wrote...> > I use the ATTiny85 as a "general purpose low-frequency thing ...I'm getting down on using PWM outputs, DACs are so cheap. -- Thanks, - Win
Reply by ●February 21, 20182018-02-21
There is a crapload of microes that has fast 12bit DACs PWM has slow response, if you need 12 bit accuracy. And injects noise from the supply Cheers Klaus
Reply by ●February 22, 20182018-02-22
On Wednesday, February 21, 2018 at 3:57:32 PM UTC-8, Klaus Kragelund wrote:> There is a crapload of microes that has fast 12bit DACs > > PWM has slow response, if you need 12 bit accuracy. And injects noise from the supplyThe ROHM devices are R/2R ladder based, so they too will pass noise from the supply (no internal reference, or reference pin). ... if you get the twelve-output one, and only need nine, could it help if one were to put filter capacitor(s) on the other outputs, and set 'em all high? That would put a decoupling capacitor on the chip side of any Vcc wiring drop. Heck, you could use an AC-coupled amp to do an active filter...
