Loop-powered digital-to-analog converter provides a 16-bit serial-input current-output solution for 4 mA to 20 mA smart transmitter designs. Pin-selectable NAMUR-compliant ranges support 4 mA to 20 mA, 3.8 mA to 21 mA, and 3.2 mA to 24 mA operation with programmable alarm currents. The device includes a SPI-compatible 3-wire interface up to 30 MHz, integrated 1.22 V and 2.5 V references, and a selectable 1.8 V to 12 V regulated output. It operates from a 5.5 V to 52 V loop voltage range over −40°C to +105°C and is offered in 28-lead TSSOP and 32-lead LFCSP packages.
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| Resolution | 16bit |
| Output current range | 4 to 20mA |
| Selectable current range | 3.8 to 21mA |
| Selectable current range | 3.2 to 24mA |
| Downscale alarm current | 3.2mA |
| Upscale alarm current | 22.8 or 24mA |
| Total unadjusted error | 0.05 max% |
| INL error | 0.0035 max% FSR |
| Output temperature coefficient | 3 typppm/°C |
| Quiescent current | 300 maxµA |
| Reference temperature coefficient | 4 maxppm/°C |
| Loop voltage range | 5.5 to 52V |
| Regulated output voltage | 1.8 to 12V |
| Reference voltages | 1.22 and 2.5V |
| Serial interface clock rate | 30MHz |
| Operating temperature range | −40 to +105°C |
| Integral nonlinearity | 0.0015 typ% |
| Gain error | 0.0006 typ% |
These are design resources that include the Analog Devices AD5421
A complete HART-compatible 4 mA to 20 mA solution using the AD5700 low-power modem and AD5420 16-bit DAC for industrial transmitter applications.
