Basic connection circuit of signal and power supply of INA326/327

The figure shows the basic connection circuit of the signal and power supply of INA 326/327 . Choose the highest precision 0.1μF capacitor as power filter and place it as close to the chip power pin as possible. Ro and Co are output filters, which can filter out the noise output by the circuit; at the same time, they can be used as input filters for the next-level circuit , such as input filtering for analog-to-digital converters. The output voltage is based on the ground terminal of R2//C2. Co and C2 combine to form a -3dB bipolar frequency response at 1kHz, with each pole at 1.5kHz. Unlike other instrumentation amplifiers, INA326/327 uses unique internal technology to achieve excellent common mode rejection ratio, so there is contact resistance during the connection process (such as socket contact resistance), which will not reduce the common mode rejection ratio. In order to achieve better high-frequency CMR, a small capacitor can be added between pins 1 and 8.