Overview
The AD7712AQ is a high-performance, 24-bit sigma-delta analog-to-digital converter (ADC) designed by Analog Devices Inc. This device is part of the AD7712 series and is specifically tailored for low-frequency measurement applications. It features a complete analog front end with two analog input channels, making it ideal for use in smart, microcontroller-based systems. The AD7712AQ supports single- or dual-supply operation and includes a bidirectional microcontroller serial interface for configuring various settings such as input channel selection, gain settings, and signal polarity.
Key Specifications
| Parameter | Value | Unit | Conditions/Comments |
|---|---|---|---|
| Resolution | 24 Bits | - | Guaranteed by Design |
| No Missing Codes | 23 Bits min | - | For Filter Notches ≤ 60 Hz |
| Nonlinearity | ±0.0015% | - | - |
| Temperature Range | -40°C to +85°C | - | - |
| Power Consumption | 25 mW typ (active), 100 µW typ (power-down) | - | - |
| Supply Voltage | Single or Dual Supply (AVDD, DVDD) | V | - |
| Package Type | 24-lead DIP, 24-lead SOIC | - | - |
Key Features
- Charge Balancing ADC with 24-bit resolution and no missing codes.
- Programmable gain for both analog input channels (gains from 1 to 128).
- Differential input for low-level channel and high-level analog input accepting signals of ±4 VREF/GAIN.
- Low-pass filter with programmable filter cutoffs.
- Ability to read/write calibration coefficients.
- Bidirectional microcontroller serial interface.
- Internal/external reference option.
- Low power consumption with power-down mode.
- Self-calibration, system calibration, and background calibration options.
Applications
The AD7712AQ is suitable for various applications, including:
- Process Control: Ideal for precision measurement and control in industrial processes.
- Smart Transmitters: Used in intelligent sensors and transmitters for accurate data transmission.
- Portable Industrial Instruments: Suitable for handheld and portable devices requiring high accuracy and low power consumption.
- Microcontroller-based Systems: Integrates well with microcontrollers and DSP processors for advanced signal processing.
Q & A
- What is the resolution of the AD7712AQ?
The AD7712AQ has a 24-bit resolution.
- What is the temperature range of the AD7712AQ?
The temperature range is -40°C to +85°C.
- Does the AD7712AQ support programmable gain?
Yes, it supports programmable gain from 1 to 128 for both analog input channels.
- What types of packages are available for the AD7712AQ?
The device is available in 24-lead DIP and 24-lead SOIC packages.
- Can the AD7712AQ operate on a single or dual supply?
Yes, it supports both single and dual supply operations.
- What is the power consumption of the AD7712AQ in active and power-down modes?
The power consumption is typically 25 mW in active mode and 100 µW in power-down mode.
- Does the AD7712AQ have calibration options?
Yes, it includes self-calibration, system calibration, and background calibration options.
- How can the AD7712AQ be configured?
It can be configured using a bidirectional microcontroller serial interface.
- What types of filters does the AD7712AQ support?
The device supports a low-pass filter with programmable filter cutoffs.
- What are some typical applications of the AD7712AQ?
Typical applications include process control, smart transmitters, portable industrial instruments, and microcontroller-based systems.
