Overview
The AD420AR-32-REEL, produced by Analog Devices Inc., 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, and low-cost single-chip solution for generating current loop signals. The AD420 is available in a compact 24-lead SOIC or PDIP package and operates over an industrial temperature range of −40°C to +85°C.
Key Specifications
| Parameter | Min | Typ | Max | Units | Comments |
|---|---|---|---|---|---|
| Power Supply Range | 12 | 32 | V | ||
| Quiescent Current | 4.2 | 5.5 | mA | ||
| Output Current Range | 0 | 20 | mA | Programmable: 4 mA to 20 mA, 0 mA to 20 mA, or 0 mA to 24 mA | |
| Integral Nonlinearity | ±0.012% | ||||
| Offset Error | ±0.05% | Trimable | |||
| Total Output Error | ±0.15% | Trimable | |||
| Serial Data Input Rate (3-Wire Mode) | No Minimum | 3.3 MBPS | |||
| Serial Data Input Rate (Asynchronous Mode) | No Minimum | 150 kBPS | |||
| Output Loop Compliance | 0 | VCC - 2.75 | V | ||
| Temperature Range | -40 | +85 | °C |
Key Features
- High precision 16-bit resolution and monotonicity
- Flexible serial digital interface (3.3 MBPS in 3-wire mode, 150 kBPS in asynchronous mode)
- On-chip loop fault detection and asynchronous CLEAR function
- On-chip 5 V reference (25 ppm/°C max) with option for external precision reference
- Programmable output current range: 4 mA to 20 mA, 0 mA to 20 mA, or 0 mA to 24 mA
- Optional voltage output from a separate pin: 0 V to 5 V, 0 V to 10 V, ±5 V, or ±10 V with an external buffer amplifier
- Compact 24-lead SOIC and PDIP packages
Applications
The AD420 is widely used in industrial control systems, process control, and automation. It is particularly suitable for applications requiring high precision current loop signals, such as in chemical processing, oil and gas, and power generation. The device can also be used in various other industrial settings where reliable and accurate current loop communication is essential.
Q & A
- What is the primary function of the AD420? The AD420 is a digital to current loop output converter designed to generate precise current loop signals in industrial control applications.
- What are the available output current ranges for the AD420? The AD420 can be programmed to output current ranges of 4 mA to 20 mA, 0 mA to 20 mA, or an overrange function of 0 mA to 24 mA.
- What is the resolution of the AD420? The AD420 has a 16-bit resolution.
- What is the maximum integral nonlinearity of the AD420? The maximum integral nonlinearity is ±0.012%.
- Does the AD420 have on-chip loop fault detection? Yes, the AD420 includes on-chip loop fault detection.
- What is the operating temperature range of the AD420? The AD420 operates over an industrial temperature range of −40°C to +85°C.
- What are the package options for the AD420? The AD420 is available in 24-lead SOIC and PDIP packages.
- Can the AD420 provide a voltage output? Yes, the AD420 can provide a voltage output from a separate pin, configurable to 0 V to 5 V, 0 V to 10 V, ±5 V, or ±10 V with an external buffer amplifier.
- What is the maximum power supply range for the AD420? The maximum power supply range is from 12 V to 32 V.
- What is the purpose of the on-chip 5 V reference? The on-chip 5 V reference can be used to supply a precision +5 V to external components and can be replaced with an external precision reference for higher temperature stability.
