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Hot-selling and scarce AD421BR Loop-Powered 4 mA to 20 mA DAC SOP16 spot stock
Manufacturer Product Number
AD421BR
Description
AD421BR Loop-Powered 4 mA to 20 mA DAC SOP16 spot stock
Package Condition
TaPe & Reel
Datasheet
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Product Descriptions
The AD421 is a complete, loop-powered, digital to 4 mA to20 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 acompact 16-lead package . The AD421 is ideal for extending theresolution of smart 4 mA to 20 mA transmitters at very low cost .
The AD421 includes a selectable regulator that is used to poweritself 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 regulatorand voltage reference . The only external components requiredare a number of passive components and a pass transistor tospan large loop voltages .
The AD421 can be used with standard HART FSK protocolcommunication circuitry without any degradation in specifiedperformance . 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 standardthree-wire serial interface .
The sigma-delta architecture of the DAC guarantees 16-bitmonotonicity while the integral nonlinearity for the AD421 is±0.01%. The part provides a zero scale 4 mA output currentwith ±0.1% offset error and a 20 mA full-scale output currentwith ±0.2% gain error .
The AD421 is available in a 16-lead, 0.3 inch-wide, plastic DIPand 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 .
Product 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
Product Specification
| Attribute | Attribute value |
| ANSM-Part# | ANSM-AD421BR |
| Category | Integrated Circuits (ICs) |
| Data Acquisition | |
| ADCs/DACs - Special Purpose | |
| Manufacturer | - |
| Packaging | Tube |
| Part Status | Obsolete |
| Type | DAC |
| Number of Channels | 1 |
| Resolution (Bits) | 16 b |
| Data Interface | MICROWIRE™, Serial |
| Voltage Supply Source | Single Supply |
| Voltage - Supply | 3V, 3.3V, 5V |
| Operating Temperature | -40°C ~ 85°C |
| Mounting Type | Surface Mount |
| Package / Case | 16-SOIC (0.295", 7.50mm Width) |
| Supplier Device Package | 16-SOIC |
| Base Product Number | AD421 |
Product Photos
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AD421BR Loop-Powered 4 mA to 20 mA DAC SOP16 spot stock
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