Overview
The AD7711AARZ, produced by Analog Devices Inc., is a comprehensive analog front end designed for low-frequency measurement applications. This CMOS, 24-bit sigma-delta analog-to-digital converter (ADC) is optimized for direct signal acceptance from transducers and outputs a serial digital word. It incorporates a programmable gain front end and an on-chip digital filter, allowing for adjustable filter cutoff and settling times. The device supports both single and dual-channel configurations and is suitable for use in smart, microcontroller-based systems.
Key Specifications
| Parameter | Specification |
|---|---|
| Resolution | 24 bits |
| Conversion Technique | Sigma-Delta |
| Input Channels | 1 differential, 1 single-ended, 1 differential reference |
| Supply Voltage | Single supply (with VSS tied to AGND) or dual supply |
| Input Signal Range | Down to -VREF with negative VSS |
| RTD Excitation Currents | Two current sources for 3-wire and 4-wire RTD configurations |
| Package Options | 24-pin SOIC (Wide), 24-lead PDIP, 24-lead CerDIP (Narrow 0.3 Inch) |
| Power Consumption | Typical standby power: 7 mW |
| Calibration Options | Self-measurement, system, and background calibration |
Key Features
- Programmable gain front end and digital filter for flexible signal processing.
- Support for single and dual-channel measurements.
- Two current sources for RTD excitation in 3-wire and 4-wire configurations.
- Software programmable via a bidirectional serial port for gain settings, signal polarity, input channel selection, and RTD current control.
- Low power dissipation with CMOS construction and a software programmable power-down mode.
- On-chip calibration registers for self-measurement, system, and background calibration.
Applications
The AD7711AARZ is ideal for various low-frequency measurement applications, including:
- Smart, microcontroller-based systems.
- Industrial process control and monitoring.
- Temperature measurement using RTDs.
- Low-level signal measurement from transducers.
Q & A
- What is the resolution of the AD7711AARZ?
The AD7711AARZ has a resolution of 24 bits.
- What conversion technique does the AD7711AARZ use?
The AD7711AARZ employs a sigma-delta conversion technique.
- How many input channels does the AD7711AARZ support?
The device supports one differential analog input, one single-ended analog input, and one differential reference input.
- What are the supply voltage options for the AD7711AARZ?
The device can operate from a single supply (with VSS tied to AGND) or a dual supply configuration.
- What is the input signal range of the AD7711AARZ?
The input signal range can go down to -VREF when using a negative VSS.
- Does the AD7711AARZ support RTD measurements?
Yes, it provides two current sources for 3-wire and 4-wire RTD configurations.
- What package options are available for the AD7711AARZ?
The device is available in 24-pin SOIC (Wide), 24-lead PDIP, and 24-lead CerDIP (Narrow 0.3 Inch) packages.
- What is the typical standby power consumption of the AD7711AARZ?
The typical standby power consumption is 7 mW.
- Does the AD7711AARZ support calibration options?
Yes, it supports self-measurement, system, and background calibration options.
- How is the AD7711AARZ programmed?
The device is software programmable via a bidirectional serial port for various settings and controls.
