| ??? 10/23/05 11:09 Read: times |
#102779 - An OPamp is needed anyway Responding to: ???'s previous message |
Mike said:
However, Figure 6 on the datasheet shows how to operate it as a voltage output without the use of an external op-amp current to voltage converter. Unfortunately, there's no such advantage, because you still need an OPamp at output, as buffer. Remember, that the R/2R ladder presents a huge source impedance (namely R), which will be much too high for most applications. Only the use of an additional OPamp will guarantee a low source impedance then. Voltage mode shows the advantage of being able to omit the negative supply voltage, but at the cost of decreased precision (1LSB instead of 1/2LSB). Kai |
| Topic | Author | Date |
| TLC7628 DAC | 01/01/70 00:00 | |
| Ref Connections | 01/01/70 00:00 | |
| RFBA is important current output of DAC | 01/01/70 00:00 | |
| Ok, which is better | 01/01/70 00:00 | |
| An OPamp is needed anyway | 01/01/70 00:00 | |
| Drawbacks of Fig 6 | 01/01/70 00:00 | |
Source impedance is constant | 01/01/70 00:00 |