Overview
The AD7172-2BRUZ-RL, produced by Analog Devices Inc., is an intelligent, low noise, low power, multiplexed, Σ-Δ (Sigma-Delta) analog-to-digital converter (ADC). This device is designed for low bandwidth signals and features 2 or 4-channel inputs, which can be configured as fully differential or single-ended channels. The AD7172-2 integrates key analog and digital signal conditioning blocks, allowing users to configure individual setups for each analog input channel via a SPI interface. It is housed in a 24-lead TSSOP package and operates over a temperature range of −40°C to +105°C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 24-bit | |
| Output Data Rates | 1.25 SPS to 31.25 kSPS | |
| Channel Scan Rate | 6.21 kSPS (161 µs settling) | |
| Input Channels | 2 fully differential or 4 single-ended | |
| Analog Input Buffers | True rail-to-rail | |
| Internal Reference | 2.5 V, ±2 ppm/°C drift | |
| Power Supply | AVDD1 = 3.0 V to 5.5 V, AVDD2 = IOVDD = 2 V to 5.5 V | |
| Current Consumption | 1.5 mA (full operating mode) | |
| Temperature Range | −40°C to +105°C | |
| Package | 24-Lead TSSOP |
Key Features
- Low noise and low power consumption, making it suitable for battery-powered applications.
- Integrated true rail-to-rail analog and reference input buffers for easy driving of high impedance inputs.
- Precision 2.5 V internal reference with low drift (±2 ppm/°C).
- Digital filter with simultaneous 50 Hz and 60 Hz rejection at a 27.27 SPS output data rate.
- Configurable offset and gain calibration registers on a per channel basis.
- General-purpose inputs/outputs (GPIOs) for controlling external multiplexers synchronous to the ADC conversion timing.
- Support for SPI, QSPI, MICROWIRE, and DSP-compatible serial interfaces.
Applications
- Process control: PLC/DCS modules.
- Temperature and pressure measurement.
- Medical and scientific multichannel instrumentation.
- Chromatography.
Q & A
- What is the resolution of the AD7172-2 ADC?
The AD7172-2 has a resolution of 24 bits.
- What are the output data rates of the AD7172-2?
The output data rates range from 1.25 SPS to 31.25 kSPS.
- How many input channels does the AD7172-2 support?
The AD7172-2 supports 2 fully differential or 4 single-ended input channels.
- What is the temperature range of the AD7172-2?
The operating temperature range is −40°C to +105°C.
- What type of package does the AD7172-2 come in?
The AD7172-2 is housed in a 24-lead TSSOP package.
- Does the AD7172-2 have an internal reference?
Yes, it has a precision 2.5 V internal reference with ±2 ppm/°C drift.
- What types of serial interfaces does the AD7172-2 support?
The AD7172-2 supports SPI, QSPI, MICROWIRE, and DSP-compatible serial interfaces.
- Can the AD7172-2 reject 50 Hz and 60 Hz noise?
Yes, the digital filter can reject both 50 Hz and 60 Hz noise simultaneously at a 27.27 SPS output data rate.
- What are some typical applications of the AD7172-2?
Typical applications include process control, temperature and pressure measurement, medical and scientific instrumentation, and chromatography.
- How does the AD7172-2 manage power consumption?
The AD7172-2 is designed for low power consumption, with a current draw of 1.5 mA in full operating mode and lower consumption in standby and power-down modes.
