AD421
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AD421

Loop-Powered 4-20 mA DAC

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Info: : PRODUCTION tooltip
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Part Details
Part Models 4
1ku List Price Starting From $9.24
Features
  • 4mA 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 µA Quiescent Current max
  • Programmable Alarm Current Capability
  • Flexible High Speed Serial Interface
  • 16-Lead SOIC and PDIP Packages
Additional Details
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The AD421 is a complete, loop-powered, digital to 4-20 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-pin package. The AD421 is ideal for extending the resolution of smart 4-20 mA transmitters at very low cost. 

The AD421 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 AD421 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 AD421 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 AD421 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 AD421 is available in a 16-pin, 0.3 inch-wide, plastic DIP and a 16-lead, 0.3 inch-wide, SOIC package. The part is specified over the industrial temperature range of -40°C to +85°C.

Part Models 4
1ku List Price Starting From $9.24

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
AD421BNZ
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AD421BRZ
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AD421BRZRL
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AD421BRZRL7
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Product Lifecycle

PCN

Mar 29, 2021

- 21_0033

Assembly Site Transfer for 14/16L 300_MIL PDIP to Cirtek

Aug 19, 2009

- 07_0024

Package Material Changes for SOT23, MiniSO, MQFP, PDIP, PLCC, SOIC (narrow and wide body), SSOP, TSSOP and TSSOP exposed pad

Aug 4, 2010

- 10_0117

Halogen Free Material Change for SOIC_W Products at Carsem

AD421BRZ

PRODUCTION

AD421BRZRL

AD421BRZRL7

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Mar 29, 2021

- 21_0033

arrow down
Aug 19, 2009

- 07_0024

arrow down

Package Material Changes for SOT23, MiniSO, MQFP, PDIP, PLCC, SOIC (narrow and wide body), SSOP, TSSOP and TSSOP exposed pad

Aug 4, 2010

- 10_0117

arrow down

Halogen Free Material Change for SOIC_W Products at Carsem

AD421BRZ

PRODUCTION

AD421BRZRL

AD421BRZRL7

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Software & Part Ecosystem

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