AD421BRZRL7 product image


Data Acquisition - ADCs/DACs - Special Purpose
Analog Devices


The  AD421BRZRL7  is a complete, loop-powered, digital to 4 mA to 20 mA converter, designed to meet the needs of smart transmitter manufacturers in the Industrial Control industry. It provides a high precision, fully integrated, low cost solution in a compact 16-lead package. The AD421BRZRL7 is ideal for extending the resolution of smart 4 mA to 20 mA transmitters at very low cost.The AD421BRZRL7 includes a selectable regulator that is used to power itself and other devices in the transmitter. This regulator provides either a +5 V, +3.3 V or +3 V regulated output voltage.The part also contains +1.25 V and +2.5 V precision references.The AD421BRZRL7 thus eliminates the need for a discrete regulator and voltage reference. The only external components required are a number of passive components and a pass transistor to span large loop voltages.The AD421BRZRL7 can be used with standard HART FSK protocol communication circuitry without any degradation in specified performance. The high speed serial interface is capable of operating at 10 Mbps and allows for simple connection to commonly-used microprocessors and microcontrollers via a standard three-wire serial interface.The sigma-delta architecture of the DAC guarantees 16-bit monotonicity while the integral nonlinearity for the AD421BRZRL7 is ±0.01%. The part provides a zero scale 4 mA output current with ±0.1% offset error and a 20 mA full-scale output current with ±0.2% gain error.The AD421BRZRL7 is available in a 16-lead, 0.3 inch-wide, plastic DIP and in a 16-lead, 0.3 inch-wide, SOIC package. The part is specified over the industrial temperature range of –40°C to +85°C.


AD421BRZRL7 Features 



• 4 mA to 20 mA Current Output HART® Compatible
• 16-Bit Resolution and Monotonicity
• 0.01% Integral Nonlinearity
• 5 V or 3 V Regulator Output
• 2.5 V and 1.25 V Precision Reference
• 750 A Quiescent Current max
• Programmable Alarm Current Capability
• Flexible High Speed Serial Interface
• 16-Lead SOIC and PDIP Packages
Resolution (Bits)16 b
Voltage Supply SourceSingle Supply
Voltage - Supply3V, 3.3V, 5V
Operating Temperature-40°C ~ 85°C
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