Overview
The AD7731BR-REEL, manufactured by Analog Devices Inc., is a low noise, high throughput 24-bit Sigma-Delta Analog-to-Digital Converter (ADC). This device is designed to serve as a complete analog front-end for process control applications. It features a proprietary programmable gain front end, allowing it to accept a wide range of input signal levels directly from transducers. The AD7731BR-REEL operates from a single +5 V supply and is available in various package types, including 24-lead SOIC, 24-lead TSSOP, and 24-lead PDIP.
Key Specifications
| Parameter | Value | Units | Conditions/Comments |
|---|---|---|---|
| Number of Bits | 24 | - | - |
| Sampling Rate | 6.4 kS/s | - | - |
| Number of Inputs | 3 (differential), 5 (pseudo-differential) | - | - |
| Data Interface | SPI, DSP | - | - |
| Configuration | MUX-PGA-ADC | - | - |
| Voltage - Supply, Analog | 5 V | V | - |
| Voltage - Supply, Digital | 5 V | V | - |
| Operating Temperature | -40°C to +85°C | °C | - |
| SNR - Signal to Noise Ratio | 125 dB | dB | - |
| INL - Integral Nonlinearity | 15 ppm | ppm | - |
| Input Voltage Ranges | 0 to +20 mV, +40 mV, +80 mV, +160 mV, +320 mV, +640 mV, +1.28 V (unipolar); ±20 mV, ±40 mV, ±80 mV, ±160 mV, ±320 mV, ±640 mV, ±1.28 V (bipolar) | V | - |
Key Features
- 24-bit Sigma-Delta ADC with high resolution and low noise.
- Programmable gain front end to accept a wide range of input signal levels.
- Three buffered differential programmable gain analog inputs (configurable as five pseudo-differential inputs).
- Differential reference input.
- Programmable output rates up to 6.4 kHz.
- Self-calibration and system calibration options.
- Low offset drift (< 5 nV/°C) and gain drift (< 2 ppm/°C).
- Serial interface compatible with microcontrollers and digital signal processors, configurable for three-wire operation.
- Available in 24-lead SOIC, 24-lead TSSOP, and 24-lead PDIP packages.
Applications
The AD7731BR-REEL is suitable for various applications, including:
- Process control systems.
- Industrial automation.
- Transducer interfaces (e.g., strain gauges, thermocouples, and pressure sensors).
- High-precision measurement systems.
- Medical devices requiring accurate analog-to-digital conversion.
Q & A
- What is the resolution of the AD7731BR-REEL?
The AD7731BR-REEL has a 24-bit resolution.
- What are the sampling rates available for the AD7731BR-REEL?
The device supports programmable output rates up to 6.4 kHz.
- How many input channels does the AD7731BR-REEL have?
The device has three buffered differential programmable gain analog inputs, which can be configured as five pseudo-differential inputs.
- What is the operating temperature range of the AD7731BR-REEL?
The operating temperature range is -40°C to +85°C.
- What is the signal-to-noise ratio (SNR) of the AD7731BR-REEL?
The SNR is 125 dB.
- Does the AD7731BR-REEL support self-calibration?
Yes, the device supports self-calibration and system calibration options.
- What are the input voltage ranges supported by the AD7731BR-REEL?
The device supports seven unipolar and seven bipolar analog input ranges, from ±20 mV to ±1.28 V.
- What types of packages are available for the AD7731BR-REEL?
The device is available in 24-lead SOIC, 24-lead TSSOP, and 24-lead PDIP packages.
- Is the AD7731BR-REEL compatible with microcontrollers and digital signal processors?
Yes, the serial interface is compatible with microcontrollers and digital signal processors and can be configured for three-wire operation.
- What is the typical application of the AD7731BR-REEL?
The AD7731BR-REEL is typically used in process control systems, industrial automation, and high-precision measurement systems.
