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AD420ARZ-32-REEL

16-bit 4-20mA current loop DAC, sigma-delta, SOIC-24W, 12-32V

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Pieza del fabricante：

AD420ARZ-32-REEL

Paquete：

SOIC-24 Wide (15.4 x 7.5 x 2.65 mm)

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Descripción

Productos

The AD420ARZ-32-REEL from Analog Devices is a serial-input 16-bit 4-20mA/0-20mA current loop DAC in a 24-pin wide SOIC package. Using sigma-delta architecture with 0.012% INL, integrated 5V reference, and loop fault detection, it provides a complete single-chip solution for industrial process control current loop outputs.

Especificaciones

Resolution 16-bit monotonic
Output Range 4-20mA, 0-20mA, or 0-24mA (current)
Voltage Output 0-5V, 0-10V, +/-5V, +/-10V (with ext amp)
INL +/-0.012% max (FSR)
Offset Error +/-0.05% max (adjustable)
Total Output Error +/-0.15% max (adjustable)
Settling Time 2.5 ms typical to 0.1% FS
Interface 3-wire serial (3.3 Mbps)
Reference Internal +5V (25 ppm/C max)
Tensión de alimentación 12V to 32V
Power Dissipation 176 mW typical
Compliance Voltage 0V to VCC-2.5V
Loop Fault Detect Yes (open-drain output)
CLEAR Pin Asynchronous output clear
BOOST Pin External transistor for power offload
Temperatura de funcionamiento -40 to +85 C
Paquete SOIC-24 Wide (15.4 x 7.5 mm)

Características

  • 16-bit monotonic sigma-delta DAC
  • 4-20mA, 0-20mA, or 0-24mA current output
  • 0-5V/10V voltage output with external buffer
  • +/-0.012% INL (16-bit accuracy)
  • Integrated +5V reference (25 ppm/C)
  • 3.3 Mbps serial interface with daisy chain
  • Loop fault detection (open-circuit)
  • Asynchronous CLEAR function
  • BOOST pin for external transistor power offload
  • Only 3 external capacitors required

Aplicaciones

  • Industrial process control (4-20mA loops)
  • PLC analog output modules
  • Valve positioners
  • Field instrument transmitters

The AD420ARZ-32-REEL from Analog Devices is a complete 16-bit digital-to-current-loop converter in a 24-pin wide SOIC package. The ARZ denotes SOIC-W package, 32 indicates 32V maximum supply voltage, and REEL indicates tape and reel packaging. Using a second-order sigma-delta architecture, the AD420 achieves 16-bit monotonicity with +/-0.012% INL at very low cost. The programmable output ranges include 4-20mA, 0-20mA, and over-range 0-24mA for current, plus an uncommitted voltage output pin for 0-5V, 0-10V, +/-5V, or +/-10V with an external buffer amplifier. The internal +5V reference (25 ppm/C max) can also supply external circuitry. The 3.3 Mbps 3-wire serial interface supports daisy-chaining multiple DACs across an isolation barrier. Loop fault detection signals when the output current loop is open. The BOOST pin allows an external transistor to offload power dissipation at high supply voltages and currents.

The AD420 operates through four subsystems: (1) Sigma-Delta DAC: A second-order sigma-delta modulator converts the 16-bit digital input to a 1-bit stream at a high oversampling ratio. This architecture inherently guarantees monotonicity, a critical requirement for industrial control loops. The 1-bit stream controls a switched current source that is filtered by two continuous-time RC sections using three external capacitors. (2) Current Output: The filtered current is amplified and mirrored to the supply rail, providing a 4-20mA, 0-20mA, or 0-24mA current source with respect to ground. The RANGE SELECT pins configure the output range. The output compliance voltage extends from 0V to VCC-2.5V. (3) Voltage Output: The VOUT pin provides an unbuffered voltage output from the sigma-delta filter. An external op-amp buffer can be configured for 0-5V, 0-10V, +/-5V, or +/-10V ranges using the internal reference. (4) Fault Detection: When the current loop is open or the compliance voltage is exceeded, the internal output amplifier saturates and the FAULT DETECT open-drain output goes low. This provides early warning before output accuracy degrades.

Pin Nombre Tipo Descripción
1 VLL Potencia Logic supply (decouple with 0.1uF)
2</td RANGE SELECT 2 Entrada Output range selection
3 FAULT DETECT Salida Open-drain fault output (active low)
4 RANGE SELECT 1 Entrada Output range selection
5 CLEAR Entrada Asynchronous output clear
6 LATCH Entrada Serial data latch (rising edge)
7 CLOCK Entrada Serial clock input
8 DATA IN Entrada Entrada de datos serie
9 DATA OUT Salida Serial data output (daisy chain)
10 GND Potencia Suelo
14 REF OUT Salida +5V reference output (25 ppm/C)
15 REF IN Entrada Reference input (internal or external)
16 OFFSET TRIM Entrada Offset adjustment
17 VOUT Salida Voltage output (unbuffered)
18 IOUT Salida Current output (4-20mA loop)
19 BOOST Salida External transistor connection
20-21 CAP1/CAP2 Analógico External filter capacitors to VCC
23 VCC Potencia Supply voltage (12-32V)
  • PLC analog output module with 4-20mA current loop, +/-0.012% INL, and daisy-chained SPI interface
  • Pressure transmitter with 16-bit DAC, loop fault detection, and internal +5V reference for sensor excitation
  • Valve positioner with 0-10V voltage output using external buffer and 12V supply
  • Industrial control with 0-24mA over-range output, BOOST pin offloading power to external transistor at 32V
Modelo Fabricante Resolution Salida Notas
AD5420 ADI 16-bit 4-20mA Newer, lower power
AD5410 ADI 12-bit 4-20mA Lower resolution
DAC8760 TI 16-bit 4-20mA/V Voltage+current output
XTR116 TI Loop-powered 4-20mA Loop-powered transmitter
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All products are sourced from official authorized channels and are 100% original genuine parts. Every batch of goods undergoes strict full-process quality inspection before delivery, with complete batch records and traceability documents provided. Our products comply with AEC-Q standards for automotive electronics and high-reliability specifications for medical devices. We eliminate counterfeits, refurbished parts and defective products from the source to secure your project production.

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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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