Overview
The ADS125H02IRHBR from Texas Instruments is a 24-bit, 40-kSPS, 2-channel delta-sigma analog-to-digital converter (ADC) designed for high-precision data acquisition applications. This device features a wide input range of ±20 V, a low-noise programmable gain amplifier (PGA), an internal reference, a clock oscillator, and signal or reference out-of-range monitors. The integration of these components into a single package reduces board area by up to 50% compared to discrete solutions. The ADS125H02IRHBR is housed in a 5-mm × 5-mm VQFN package and is fully specified over the –40°C to +125°C temperature range.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 24-bit | |
| Sampling Rate | 2.5 SPS to 40 kSPS | |
| Input Range | ±20 V | |
| Programmable Gain | 0.125 to 128 | |
| Input Impedance | 1 GΩ (minimum) | |
| Common-Mode Rejection Ratio (CMRR) | 105 dB | |
| Normal-Mode Rejection at 50 Hz, 60 Hz | 95 dB | |
| Offset Drift | 5 nV/°C | |
| Gain Drift | 1 ppm/°C | |
| Integral Non-Linearity (INL) | 2 ppm | |
| Input Noise | 45 nV | |
| Power Supplies | AVDD: 4.75 V to 5.25 V, DVDD: 2.7 V to 5.25 V, HVDD: ±5 V to ±18 V | V |
| Operating Temperature | –40°C to +125°C | °C |
| Package | 5-mm × 5-mm VQFN |
Key Features
- Low-noise programmable gain amplifier (PGA) with a gain range of 0.125 to 128.
- Internal 2.5-V reference with 3 ppm/°C drift.
- Integrated clock oscillator with a maximum error of 2.5%.
- Excitation current sources and GPIOs to drive external multiplexers.
- Signal and reference voltage monitors.
- Cyclic redundancy check (CRC) for data integrity.
- Digital filter to attenuate 50-Hz and 60-Hz line cycle noise.
- No-latency conversion data for high data throughput during channel sequencing.
- Direct connections to bridge, resistance temperature detector (RTD), and thermocouple sensors due to low noise and low drift performance.
Applications
- PLC analog input modules for voltage, current, and temperature measurements.
- Test and measurement applications involving high common-mode voltage inputs, battery testing, and high-side current measurement.
- Data acquisition systems requiring high precision and low noise.
- Sensor interfaces for bridge, RTD, and thermocouple sensors.
Q & A
- What is the resolution of the ADS125H02IRHBR ADC?
The ADS125H02IRHBR has a 24-bit resolution.
- What is the sampling rate range of the ADS125H02IRHBR?
The sampling rate ranges from 2.5 SPS to 40 kSPS.
- What is the input range of the ADS125H02IRHBR?
The input range is ±20 V.
- What is the programmable gain range of the ADS125H02IRHBR?
The programmable gain ranges from 0.125 to 128.
- What is the minimum input impedance of the ADS125H02IRHBR?
The minimum input impedance is 1 GΩ.
- What is the common-mode rejection ratio (CMRR) of the ADS125H02IRHBR?
The CMRR is 105 dB.
- What are the power supply requirements for the ADS125H02IRHBR?
The power supplies are AVDD: 4.75 V to 5.25 V, DVDD: 2.7 V to 5.25 V, and HVDD: ±5 V to ±18 V.
- What is the operating temperature range of the ADS125H02IRHBR?
The operating temperature range is –40°C to +125°C.
- What package type is the ADS125H02IRHBR available in?
The ADS125H02IRHBR is housed in a 5-mm × 5-mm VQFN package.
- What are some of the key applications of the ADS125H02IRHBR?
Key applications include PLC analog input modules, test and measurement, and data acquisition systems.
