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420AR-32

Analog Devices
Part Number 420AR-32
Manufacturer Analog Devices
Description AD420AR-32
Published Jun 2, 2011
Detailed Description a FEATURES 4–20 mA, 0–20 mA or 0–24 mA Current Output 16-Bit Resolution and Monotonicity ؎ 0.012% max Integral Nonlinear...
Datasheet PDF File 420AR-32 PDF File

420AR-32
420AR-32

Overview
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 commonly used microprocessors.
It can be used in three-wire or asynchronous mode and a serial-out pin is provided to allow daisy chaining of multiple DACs on the current loop side of the isolation barrier.
The AD420 uses sigma-delta (Σ∆) DAC technology to achieve 16-bit monotonicity at very low cost.
Full-scale settling to 0.
1% occurs within 3 ms.
The only external components that are required (in addition to normal transient protection circuitry) are three low cost capacitors which are used in the D...


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