Datasheet Analog Devices AD421 — 数据表

a Loop-Powered
4 mA to 20 mA DAC
AD421 FEATURES
4 mA to 20 mA Current Output
HARTВ® Compatible
16-Bit Resolution and Monotonicity
вґћ0.01% Integral Nonlinearity
5 V or 3 V Regulator Output
2.5 V and 1.25 V Precision Reference
750 вђ®A Quiescent Current max
Programmable Alarm Current Capability
Flexible High Speed Serial Interface
16-Lead SOIC and PDIP Packages FUNCTIONAL BLOCK DIAGRAM
REF IN
(+2.5V) REF OUT1 REF OUT2
(+2.5V)
(+1.25V) AD421 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
В± 0.01%. The part provides a zero scale 4 mA output current …