Overview
The AD7711AR-REEL7, produced by Analog Devices Inc., is a comprehensive analog front end designed for low-frequency measurement applications. This device is particularly suited for systems requiring high accuracy and low power consumption. It features a sigma-delta analog-to-digital converter (ADC) with up to 24 bits of no missing codes performance, ensuring high precision in signal conversion. The AD7711AR-REEL7 supports single or dual-supply operation and includes on-chip current sources for excitation in 3-wire and 4-wire RTD configurations. It is ideal for use in smart, microcontroller-based systems and is widely used in applications such as RTD transducers, process control, smart transmitters, and portable industrial instruments.
Key Specifications
| Parameter | Description |
|---|---|
| Number of Bits | 24 |
| Sampling Rate | 1 kSPS |
| Number of Inputs | 2 (Differential and Single-Ended) |
| Input Type | Differential |
| Data Interface | SPI |
| Architecture | Sigma-Delta |
| Reference Type | External, Internal |
| Voltage - Supply, Analog | 5 V ~ 10 V |
| Voltage - Supply, Digital | 5 V |
| Operating Temperature | -40°C ~ 85°C |
| Package | 24-SOIC (0.295", 7.50mm Width) |
| Power Consumption | 25 mW (typical), 7 mW (power-down mode) |
Key Features
- Programmable Gain Front End: Allows the AD7711 to accept input signals directly from an RTD transducer, reducing the need for additional signal conditioning.
- On-Chip Current Sources: Provides excitation for 3-wire and 4-wire RTD configurations.
- No Missing Codes: Ensures true, usable 23-bit dynamic range with excellent ±0.0015% accuracy.
- Self-Calibration and Background Calibration: Eliminates zero-scale and full-scale errors due to temperature drift.
- Software Programmable Power-Down Mode: Reduces standby power consumption to 7 mW typical.
- Flexible Input Configuration: Supports single or dual-supply operation and includes differential and single-ended analog inputs.
- Serial Interface: SPI interface for easy communication with microcontrollers or DSP processors.
Applications
- RTD Transducers: Ideal for temperature measurement applications using RTD transducers.
- Process Control: Used in industrial process control systems for precise measurement and control.
- Smart Transmitters: Integrated into smart transmitter systems for accurate and reliable data transmission.
- Portable Industrial Instruments: Suitable for portable industrial instruments due to its low power consumption and compact design.
Q & A
- What is the resolution of the AD7711AR-REEL7?
The AD7711AR-REEL7 has a resolution of up to 24 bits.
- What types of inputs does the AD7711AR-REEL7 support?
The AD7711AR-REEL7 supports both differential and single-ended analog inputs.
- What is the sampling rate of the AD7711AR-REEL7?
The sampling rate of the AD7711AR-REEL7 is 1 kSPS.
- Does the AD7711AR-REEL7 support power-down mode?
Yes, the AD7711AR-REEL7 has a software programmable power-down mode that reduces power consumption to 7 mW typical.
- What is the operating temperature range of the AD7711AR-REEL7?
The operating temperature range is -40°C to 85°C.
- What type of data interface does the AD7711AR-REEL7 use?
The AD7711AR-REEL7 uses an SPI (Serial Peripheral Interface) for data communication.
- Does the AD7711AR-REEL7 have on-chip current sources for RTD excitation?
Yes, the AD7711AR-REEL7 includes on-chip current sources for 3-wire and 4-wire RTD configurations.
- What is the typical power consumption of the AD7711AR-REEL7?
The typical power consumption is 25 mW, with a power-down mode of 7 mW.
- What kind of calibration options are available on the AD7711AR-REEL7?
The AD7711AR-REEL7 offers self-calibration, system calibration, and background calibration options.
- What is the package type of the AD7711AR-REEL7?
The AD7711AR-REEL7 is available in a 24-SOIC package.
