Transcription of AD421 data sheet - Analog Devices
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AD421 data sheet - Analog Devices
A Loop-Powered 4 mA to 20 mA DAC. AD421 . FEATURES FUNCTIONAL BLOCK DIAGRAM. 4 mA to 20 mA Current Output HART Compatible REF IN REF OUT1 REF OUT2. 16-Bit Resolution and Monotonicity (+ ) (+ ) (+ ) LV VCC. Integral Nonlinearity 5 V or 3 V Regulator Output . 75k . V and V Precision Reference AD421 . 750 A Quiescent Current max 134k . Programmable Alarm Current Capability BANDGAP DRIVE. Flexible High Speed Serial Interface REFERENCE. 121k COMP. 16-Lead SOIC and PDIP Packages LOCAL BOOST. OSCILLATOR. data INPUT SHIFT. CLOCK REGISTER. SWITCHED. 16-BIT CURRENT. LATCH DAC LATCH SIGMA- SOURCES. DELTA DAC AND 40 . GENERAL DESCRIPTION FILTERING. 80k LOOP. The AD421 is a complete, loop-powered, digital to 4 mA to POWER-ON. RTN. RESET. 20 mA converter, designed to meet the needs of smart trans- mitter manufacturers in the Industrial Control industry. It pro- COM C1 C2 C3.
functional block diagram local oscillator switched current sources and filtering bandgap reference ref in (+2.5v) ref out1 (+1.25v) ref out2 (+2.5v) lv vcc drive
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