GENERAL DESCRIPTION
The 1B21 is an isolated voltage-to-current converter that incorporates a unique circuit design utilizing transformer-based isolation and automated surface-mount manufacturing technology. It provides an unbeatable combination of versatility and performance in a compact plastic package. Designed for industrial applications, it is especially suited for harsh environments with extremely high common-mode interference.

FEATURES
    Wide input range: 0 V to 1 V up to 0 V to 10 V
    High CMV isolation: 1500 V rms
    Programmable output ranges: 4mA to 20mA
        0 to 20 mA
    Load resistance range: 0 to 1.35 kΩ maximum
    High accuracy
        Low offset tempco: ±300 nA/°C
        Low gain tempco: ±50 ppm/°C
        Low nonlinearity: ±0.02%
        High CMR: 90 dB minimum
    Small package: 0.7” × 2.1” × 0.35”
    Meets IEEE Standard 472: transient protection (SWC)

APPLICATIONS
    Multichannel process control
    DAC—current loop interface
    Analog transmitters and controllers
    Remote data acquisition systems