As shown in FIG constituted by OPA340 INA321/322 output buffer circuit. INA321/322 optimum load impedance 10k or more. When the load impedance decreases, the output current wil
l increase. Op amp OPA340 constitute a voltage follower as an output buffer circuit for increasing the output drive capability INA321/322s. OPA340 maximum output voltage swing is lower than the supply voltage 50mV, able to drive up to 600 load.