To make a conditioning circuit that requires lower drift and offset, I would like to ask if there is a power supply with higher accuracy, lower noise, and more stable power that can power the op amp. The input is 220V AC. The power supply must have high accuracy and cannot increase the error of the entire system. If there is a power module or power chip, it is best to mention the peripheral circuit a little.
Hope the experienced can provide some help.
Ivey ポストする September 9, 2020
This depends on the specific requirements of the product. If ±5V can meet the requirements of the entire system and does not affect the output of the subsequent stage, the same power supply can be used.
Aly ポストする September 9, 2020
If the op amp used is powered by a single power supply of 5V, the landlord can use the TPS7350. This regulator chip can meet the needs of the landlord, but the price is relatively high; if the op amp is dual power +5V and -5V power supply, the landlord can Using TPS7350+ILC7660, the former is a 5V precision voltage regulator chip, and the latter is a +5V to -5V chip.
The reference circuit of TPS7350 is as follows:
ICL7660 reference circuit is as follows:
