420AR-32

a FEATURES 4–20 mA, 0–20 mA or 0–24 mA Current Output 16-Bit Resolution and Monotonicity ؎ 0.012% max Integral Nonlinearity ؎ 0.05% max Offset (Trimmable) ؎ 0.15% max Total Output Error (Trimmable) Flexible Serial Digital Interface (3.3 MBPS) On-Chip Loop Fault Detection On-Chip 5 V Reference (25 ppm/؇C max) Asynchronous CLEAR Function Maximum Power Supply Range of 32 V Output Loop Compliance of 0 V to VCC – 2.5 V 24-Pin SOIC and PDIP Packages PRODUCT DESCRIPTION VLL REF OUT Serial Input 16-Bit 4–20 mA, 0–20 mA DAC AD420 FUNCTIONAL BLOCK DIAGRAM VCC REFERENCE 4kΩ 40Ω BOOST www.DataSheet4U.com AD420 REF IN DATA OUT CLEAR LATCH CLOCK DATA IN RANGE SELECT 1 RANGE SELECT 2 CLOCK DATA I/P REGISTER IOUT 16-BIT DAC SWITCHED CURRENT SOURCES AND FILTERING VOUT 1.25kΩ FAULT DETECT The AD420 is a complete digital to current loop output converter, designed to meet the needs of the industrial control market. It provides a high precision, fully integrated, low cost single-chip solution for generating current loop signals in a compact 24-pin SOIC or PDIP package. The output current range can be programmed to 4 mA–20 mA, 0 mA–20 mA or an overrange function of 0 mA–24 mA. The AD420 can alternatively provide a voltage output from a separate pin that can be configured to provide 0 V–5 V, 0 V–10 V, ± 5 V or ± 10 V with the addition of a single external buffer amplifier. The 3.3M Baud serial input logic design minimizes the cost of galvanic isolation and allows for simple connection to commo...