| ??? 09/30/10 23:53 Read: times |
#178811 - There are several ways... Responding to: ???'s previous message |
Richard said:
I just got a call from a former colleague who wants to use a small MCU (just a few pins) to receive and interpret output from a V to F converter (remote) into ten digital output signals and an analog output. Have any of you guys run across a small MCU (low pin count) that can do this? I've found a number of small (20 or 24 pin) MCU's that have ADC, but what DAC? By ten digital outputs you mean that the frequency shall be translated into a 10bit word? Well, there are many ways to accomplish this: 1. You form a 10bit R2R-ladder using 10 port pins of the micro. -> A bit critical if high precision is desired. 2. You feed a tiny high precision serial DAC. -> Probably offering the best cost effectivness. 3. You feed a 16bit-PWM and low pass filter the resulting pulse train, like Michael already mentioned. SILABS micros contain superb 16bit-PWMs. -> Rather high settling time if high precision and low ripple is needed. 4. You take a MCU already containing a DAC. SILABS have very precise ones. -> Might result in a MCU having many more port pins than you actually need... Kai Klaas |
| Topic | Author | Date |
| What would you use? | 01/01/70 00:00 | |
| Try this | 01/01/70 00:00 | |
| Another query | 01/01/70 00:00 | |
| If even you Americans don't understand each other... | 01/01/70 00:00 | |
| My point was ... | 01/01/70 00:00 | |
| PSoC | 01/01/70 00:00 | |
| The display is really simple | 01/01/70 00:00 | |
| there is a '51 PSoC | 01/01/70 00:00 | |
| 8051=PSoC3 | 01/01/70 00:00 | |
| There are several ways... | 01/01/70 00:00 | |
| It's going to have to be a delicate introduction to MCU's | 01/01/70 00:00 | |
| parametric search | 01/01/70 00:00 | |
| Couldn't find that ... this time | 01/01/70 00:00 | |
| built-in DAC | 01/01/70 00:00 | |
| also in some 3xx's | 01/01/70 00:00 | |
| C8051F330-GP | 01/01/70 00:00 | |
| I've decided that's a good choice | 01/01/70 00:00 | |
| Maybe drive LEDs without LED driver? | 01/01/70 00:00 | |
I haven't yet considered that ... | 01/01/70 00:00 | |
| Analog DevicesADUC814 | 01/01/70 00:00 | |
| That's one of the sheets I sent him | 01/01/70 00:00 | |
| 2 chips maybe better | 01/01/70 00:00 | |
| what resolution? | 01/01/70 00:00 | |
| They're under consideration | 01/01/70 00:00 | |
| '51 with d to a | 01/01/70 00:00 |