> 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
>
Impressive!
Why the 2 packages? The big one is rather wasteful of space..
Reply by whit3rd●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 supply
The 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...
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 Winfield Hill●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 Winfield Hill●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 bitrex●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 Phil Hobbs●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.nethttp://hobbs-eo.com
Reply by Winfield Hill●February 21, 20182018-02-21
Phil Hobbs wrote...
>
> The Rohm BH2226F.
BH2221 12-channels.
--
Thanks,
- Win
Reply by Phil Hobbs●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 buck
Those 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.nethttps://hobbs-eo.com
Reply by bitrex●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