LTC6655_1.25V high precision voltage reference source

LTC6655_1.25V high-precision voltage reference source, the voltage accuracy reaches 50UV level, can be used to calibrate a 4.5-digit multimeter, and has 6 sets of high-precision voltage outputs (1.2500/2.000/4.000/6.000/8.000//10.000V), The temperature drift should be 10ppm. There is no high-end meter calibration. Anyway, it is no problem to calibrate a four-and-a-half-digit multimeter! The picture below shows the lithium battery charger. I used four polymer lithium batteries (maximum voltage 17V)

The picture below shows a 10v power supply circuit using a dual reference power supply    . The picture below shows a high-precision low-temperature drift reference voltage circuit. The picture below shows a 1.250V amplification circuit 8 times using a 5uV input offset, low-temperature drift, and single-voltage precision operational amplifier. , To ensure the accuracy of the 5 sets of voltages, you must purchase high-precision, low-temperature drift precision resistors! The following is an empty PCB board. Voltage 1.250V Voltage 2.000V Voltage 4.000V Voltage 6.000V Voltage 8.000V Voltage 10.000V Through testing, it was found that the 1.2500V and 10.000V of this voltage reference source are very accurate. The other sets of voltages are through resistors. It is obtained by dividing the voltage, so the internal resistance of the multimeter affects the accuracy of the test when testing these sets of voltages, so I reduced the voltage dividing resistors to 1K, and the output current of the op amp is also a maximum of 2MA. This reduction It is 20 times smaller, so the impact of the internal resistance of the multimeter will be reduced by 20 times. In the next version, I will use several independent op amps to make emitter followers to eliminate the impact of the multimeter. Some components in the circuit are optional and secondary. One thing, I hope everyone will solder the ESD and TVS diodes. I also modified some of the component parameters after debugging in the circuit schematic. Regarding the accuracy of the resistors, the lithium battery charging circuit can use 1% accuracy. The rest You can buy a resistor of 0.01%, which is best. If the capacitor has a withstand voltage of not less than 25V, I hope you can make it successfully! Ollie, just do it!

Here is the video link: https://v.youku.com/v_show/id_XNDU5OTg4NTg1Mg==.html