Overview
The AD7711ASQ, produced by Analog Devices Inc., is a comprehensive analog front end designed for low-frequency measurement applications. This device utilizes a sigma-delta conversion technique to achieve up to 24 bits of no missing codes performance, making it highly accurate for precision measurements. It accepts low-level signals directly from transducers and outputs a serial digital word. The AD7711ASQ is ideal for use in smart, microcontroller-based systems due to its programmable gain front end, internal/external reference options, and bidirectional serial interface.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 24 bits |
| Input Type | 2 differential analog inputs, 1 differential reference input |
| Gain Settings | Programmable gain from 1 to 128 |
| Filter Cutoff | Programmable via on-chip control register |
| RTD Current Source | 400 mA current source for RTD excitation |
| Supply Voltage | Single or dual supply operation |
| Operating Temperature | -55°C to +125°C |
| Package Type | 24-lead CerDIP (Narrow 0.3 Inch), 24-lead SOIC |
| Power Consumption | 25 mW typical, 7 mW in power-down mode |
| Data Interface | Bidirectional serial port (SPI) |
Key Features
- 24-bit sigma-delta analog-to-digital converter with no missing codes performance.
- Programmable gain front end with gains from 1 to 128.
- Differential and single-ended analog inputs, along with a differential reference input.
- Internal/external reference options and bidirectional serial interface.
- Self-calibration, system calibration, and background calibration options.
- Low power consumption with a software programmable power-down mode.
- CMOS construction ensuring low power dissipation.
- Ability to read and write calibration coefficients.
Applications
- RTD transducers and other low-frequency measurement applications.
- Smart, microcontroller-based systems requiring precision analog-to-digital conversion.
- Industrial automation and process control systems.
- Medical devices and diagnostic equipment.
- High-precision data acquisition systems.
Q & A
- What is the resolution of the AD7711ASQ?
The AD7711ASQ has a resolution of 24 bits with no missing codes performance.
- What types of inputs does the AD7711ASQ support?
The device supports two differential analog inputs and one differential reference input.
- Can the gain settings of the AD7711ASQ be programmed?
Yes, the gain settings are programmable from 1 to 128.
- How does the AD7711ASQ handle RTD excitation?
The device provides a 400 mA current source for RTD excitation in three-wire and four-wire configurations.
- What is the operating temperature range of the AD7711ASQ?
The operating temperature range is -55°C to +125°C.
- What are the available package types for the AD7711ASQ?
The device is available in 24-lead CerDIP (Narrow 0.3 Inch) and 24-lead SOIC packages.
- How much power does the AD7711ASQ consume?
The typical power consumption is 25 mW, and it reduces to 7 mW in power-down mode.
- What type of data interface does the AD7711ASQ use?
The device uses a bidirectional serial port (SPI) for data communication.
- Does the AD7711ASQ support calibration options?
Yes, it supports self-calibration, system calibration, and background calibration options.
- Can the calibration coefficients be read and written on the AD7711ASQ?
Yes, the user can read and write the on-chip calibration registers.
