XTR101 internal functional principle and basic application circuit

The XTRIOO series 4~20mA current transmitter mainly includes XTRIOJ, XTR103 to XTR117 (except XTR110
).
    XTR101 is a 4-20mA two-wire current transmitter, which integrates instrument amplifier , voltage-controlled current source, dual-paired
precision current source and other circuits. Its internal functional principle and basic application circuit are shown in Figure IO-26.
    Pins ⑩ and ⑩ are two ImA current source output terminals, which are fed back to the amplifier A3 inside pin ⑦ through an external circuit. A3
amplifies the current and provides a reference current to the amplifier Al; the input signal is sent to the amplifiers
Al and A2 for amplification, and is limited by the external resistor Rs. The size of the output current, because the standard current transmitter output current range is 4~20mA, so
the maximum output current must be set to 20m.A; the relationship between the output current, Rs, and the input voltage eIN is
    gross = 4mA+ (0.016n +40/Rs) e II\ ,elN 2 e2 -81
    For example, assuming the input voltage is 0—100mV, then
    (0. 016fl+40/ RS )×AeIH=AIo=16(mA)
    40
    Rs 2 Ao /A. 1N -0. 016
    Rs -can be five-sided and ≤) rF 006=——plastic-one-404=278(fl,)
    0.016 -0~6016 -0.1