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AD420R32, AD421, AD421 BN

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Info of AD420R32
Info of AD421
Info of AD421 BN

AD420R32, AD421, AD421 BN Selling Leads, Datasheet

MFG:ANALOGDEVI Package Cooled:N/A D/C:09+

AD420R32, AD421, AD421 BN Datasheet download

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Part Number: AD420R32

MFG: ANALOGDEVI

Package Cooled: N/A

D/C: 09+

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AD421 General Description

The AD421 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 AD421 is ideal for extending the resolution of smart 4 mA to 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-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 to +85.

AD421 Maximum Ratings

(T_A = +25 unless otherwise noted)
DRIVE, BOOST, COMP to COM .  . . 0.5 V to V_CC+ 0.5 V
LOOP RTN to COM . . . . . . . . . . .  . . . . . . 2 V to + 0.5 V
Digital Input Voltage to COM . .   . 0.5 V to V_CC + 0.5 V
Operating Temperature Range
Commercial (B Version) . . . . . . . . . .  . . . 40 to +85
Storage Temperature Range . . . . . . . . 65 to +150
Junction Temperature . . . . . . . . . . . . . . . . . . . . . +150
Plastic DIP Package, Power Dissipation . . . . . . . 670 mW
JA Thermal Impedance . . . . . . . . . . . . . . .. .. . . 116/W
Lead Temperature (Soldering, 10 sec) . . . .. . .. . . . 260
SOIC Package, Power Dissipation . . . . . . .. . . . . 450 mW
JA Thermal Impedance . . . . . . . . . . . . . . .. . . . 110/W
Lead Temperature, Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . .. . .. . . . . +215
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . .. . . . +220

AD421 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

AD421 Typical Application

Figure 11 shows the basic connection diagram for the AD421 operating at 5 V. This circuit shows the minimum of external components to operate the AD421. In the diagram, the AD421's regulator loop in conjunction with the DN25D pass transistor provides the VCC voltage for the AD421 itself and for other devices in the transmitter. The VCC pin should be well decoupled with a 2.2 F capacitor to ensure regulator stability and to absorb power glitches on the VCC line of the AD421 and other devices in the system. If the AD421 is operated with VCC = 3 V, the transfer function shifts negative. To correct for this a 16 k resistor connected between COM and LOOPRTN will approximately compensate for the VCC supply sensitivity in moving from 5 V to 3 V by adjusting the gain of the AD421.

AD421 Connection Diagram

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