Overview
The AD7711AAR is a 24-bit, low-frequency, sigma-delta analog-to-digital converter (ADC) produced by Analog Devices Inc. This component is designed as a complete analog front end for low-frequency measurement applications, particularly suitable for use with RTD transducers and other low-level signal sources. It features a programmable gain front end, differential inputs, and a built-in current source for RTD excitation. The AD7711AAR operates with high accuracy and low power consumption, making it ideal for smart, microcontroller-based systems.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 24 bits |
| Accuracy | ±0.0015% |
| Noise | <250 nV rms |
| Input Type | Differential |
| Gain Range | 1 to 128 |
| Reference Input | Differential |
| Current Source | 400 μA for RTD excitation |
| Supply Voltage | Single or dual supply operation |
| Operating Temperature | -40°C to +85°C |
| Power Consumption | 25 mW typical, 7 mW in power-down mode |
| Package Options | 24-lead SOIC, 24-lead CERDIP |
Key Features
- Charge balancing ADC with 24-bit no missing codes performance
- Programmable gain front end with gains from 1 to 128
- Differential inputs and differential reference input
- Low-pass filter with programmable filter cutoffs
- Ability to read/write calibration coefficients
- Bidirectional microcontroller serial interface
- Internal/external reference option
- Single or dual supply operation
- Low power consumption with power-down mode
- Self-calibration, system calibration, and background calibration options
Applications
The AD7711AAR is primarily used in low-frequency measurement applications, particularly with RTD transducers. It is suitable for use in smart, microcontroller-based systems and is often employed in industrial and instrumentation settings. The device's high accuracy and low power consumption make it ideal for applications requiring precise signal conditioning and conversion.
Q & A
- What is the resolution of the AD7711AAR?
The AD7711AAR has a resolution of 24 bits. - What is the accuracy of the AD7711AAR?
The accuracy of the AD7711AAR is ±0.0015%. - What type of inputs does the AD7711AAR have?
The AD7711AAR has differential inputs and a differential reference input. - What is the gain range of the AD7711AAR?
The gain range of the AD7711AAR is from 1 to 128. - Does the AD7711AAR have a built-in current source?
Yes, the AD7711AAR has a 400 μA current source for RTD excitation. - What are the operating temperature ranges for the AD7711AAR?
The operating temperature range for the AD7711AAR is -40°C to +85°C. - How much power does the AD7711AAR consume?
The AD7711AAR consumes 25 mW typical and 7 mW in power-down mode. - What package options are available for the AD7711AAR?
The AD7711AAR is available in 24-lead SOIC and 24-lead CERDIP packages. - Can the AD7711AAR operate on a single supply?
Yes, the AD7711AAR can operate on a single supply by tying the VSS pin to AGND. - Does the AD7711AAR support calibration options?
Yes, the AD7711AAR supports self-calibration, system calibration, and background calibration options.
