Overview
The AD7172-2BRUZ, produced by Analog Devices Inc., is an intelligent, low noise, low power, multiplexed, Σ-Δ analog-to-digital converter (ADC). This device is designed for low bandwidth signals and features 2- or 4-channel inputs that can be configured as fully differential or single-ended. The AD7172-2 integrates key analog and digital signal conditioning blocks, allowing users to configure individual setups for each analog input channel via the SPI interface. It includes integrated true rail-to-rail buffers on the analog inputs and external reference inputs, as well as a precision 2.5 V low drift internal reference. The device operates over a temperature range of −40°C to +105°C and is packaged in a 24-lead TSSOP package.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 24-bit | |
| Maximum Sample Rate | 31.25 kSPS | |
| Maximum Channel Scan Rate | 6.21 kSPS (161 µs) | |
| Output Data Rates | 1.25 SPS to 31.25 kSPS | |
| Input Configuration | 2- or 4-channel (fully differential/single-ended) | |
| Operating Temperature Range | −40°C to +105°C | |
| Package Type | 24-Lead TSSOP | |
| Internal Reference Voltage | 2.5 V (low drift, 2 ppm/°C) | |
| Power Consumption (Full Operating Mode) | 3.16 mW (AVDD1 = 3.3 V, AVDD2 = 2 V, IOVDD = 2 V) | |
| Standby Mode Current | 32 µA (Reference off), 420 µA (Reference on) | |
| Power-Down Mode Current | 1 µA to 10 µA |
Key Features
- Integrated true rail-to-rail buffers on the analog inputs and external reference inputs.
- Precision 2.5 V low drift (2 ppm/°C) internal reference with an output reference buffer.
- Digital filter allowing simultaneous 50 Hz and 60 Hz rejection at a 27.27 SPS output data rate.
- Offset and gain calibration registers configurable on a per channel basis.
- General-purpose inputs/outputs (GPIOs) for controlling external multiplexers synchronous to the ADC conversion timing.
- 3- or 4-wire serial digital interface (SPI, QSPI-, MICROWIRE-, and DSP-compatible).
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 is the maximum sample rate of the AD7172-2?
The maximum sample rate is 31.25 kSPS.
- What types of input configurations are supported by the AD7172-2?
The AD7172-2 supports 2- or 4-channel inputs that can be configured as fully differential or single-ended.
- What is the operating temperature range of the AD7172-2?
The operating temperature range is −40°C to +105°C.
- What package type is the AD7172-2 available in?
The AD7172-2 is available in a 24-lead TSSOP package.
- Does the AD7172-2 have an internal reference voltage?
Yes, it has a precision 2.5 V low drift (2 ppm/°C) internal reference.
- What are the power consumption characteristics of the AD7172-2?
The power consumption in full operating mode is 3.16 mW (AVDD1 = 3.3 V, AVDD2 = 2 V, IOVDD = 2 V), and in standby mode, it is 32 µA (Reference off) or 420 µA (Reference on).
- What digital interfaces are supported by the AD7172-2?
The AD7172-2 supports 3- or 4-wire serial digital interfaces (SPI, QSPI-, MICROWIRE-, and DSP-compatible).
- Can the AD7172-2 reject 50 Hz and 60 Hz noise?
Yes, the digital filter allows simultaneous 50 Hz and 60 Hz rejection at a 27.27 SPS output data rate.
- What are some common applications of the AD7172-2?
Common applications include process control, temperature and pressure measurement, medical and scientific multichannel instrumentation, and chromatography.
