AD420ARZ-32

AD420 is a complete digital to current loop output converter, designed to meet the needs of the industrial control market. It provides a high precision, fully integrated, low cost single-chip solution for generating current loop signals in a compact package. The 3.3M Baud serial input logic design minimizes the cost of galvanic isolation and allows for simple connection to commonly used microprocessors. It can be used in 3-wire or asynchronous mode and a serial-out pin is provided to allow daisy chaining of multiple DACs on the current loop side of the isolation barrier. If the AD420 is used at extreme temperatures and supply voltages, an external output transistor can be used to minimize power dissipation on the chip via the BOOST pin. The FAULT DETECT pin signals when an open circuit occurs in the loop.

• At power-up, this initializes its output to the low end of the selected range
• This has an asynchronous CLEAR pin, which sends the output to the low end of the selected range
• BOOST pin accommodates an external transistor to off-load power dissipation from the chip
• Resolution is 16bit minimum (TA=TMIN − TMAX, VCC=+24V)
• Operating current ranges from 4 to 20mA (TA=TMIN − TMAX, VCC=+24V)
• Output impedance (current mode) is 25Mohm typ (TA=TMIN − TMAX, VCC=+24V)
• Offset drift is 50ppm/°C maximum (TA=TMIN − TMAX, VCC=+24V)
• PSRR is 10µA/V maximum (TA=TMIN − TMAX, VCC=+24V), 32V maximum operating voltage
• 24-lead SOIC-W package
• Temperature rating range from -40°C to +85°C

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party