Overview
The ADS125H02IRHBT, produced by Texas Instruments, is a high-performance, 24-bit, delta-sigma (ΔΣ) analog-to-digital converter (ADC) designed for a wide range of applications requiring high accuracy and low noise. This ADC features a ±20-V input range, a programmable gain amplifier (PGA), an internal reference, a clock oscillator, and various diagnostic and monitoring capabilities. The integration of these components into a single package significantly reduces board area compared to discrete solutions, making it ideal for space-constrained designs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 24-bit | |
| Input Range | ±20 V | |
| Programmable Gain | 0.125 to 128 | |
| Data Rate | 2.5 SPS to 40 kSPS | |
| Input Impedance | 1 GΩ (minimum) | |
| Input Noise | 45 nV RMS (at 20 SPS) | |
| CMRR | 105 dB | |
| Normal-mode Rejection | 95 dB (at 50 Hz, 60 Hz) | |
| Offset Drift | 5 nV/°C | |
| Gain Drift | 1 ppm/°C | |
| INL | 2 ppm | |
| Power Supplies | AVDD: 4.75 V to 5.25 V, DVDD: 2.7 V to 5.25 V, HVDD: ±5 V to ±18 V | |
| Operating Temperature | –40°C to +125°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.
- High input impedance (1 GΩ minimum) to reduce sensor loading errors.
Applications
- PLC analog input modules for voltage, current, and temperature measurements (e.g., RTDs, thermocouples).
- Test and measurement equipment requiring high common-mode voltage inputs.
- Battery testing and high-side current measurement.
Q & A
- What is the resolution of the ADS125H02IRHBT ADC? The ADS125H02IRHBT has a 24-bit resolution.
- What is the input voltage range of the ADS125H02IRHBT? The input voltage range is ±20 V.
- What are the programmable gain options for the PGA? The PGA has a programmable gain range of 0.125 to 128.
- What are the data rate options for the ADS125H02IRHBT? The data rate can be programmed from 2.5 SPS to 40 kSPS.
- What is the input impedance of the ADS125H02IRHBT? The minimum input impedance is 1 GΩ.
- How does the digital filter in the ADS125H02IRHBT work? The digital filter attenuates 50-Hz and 60-Hz line cycle noise and provides no-latency conversion data for high data throughput during channel sequencing.
- What are the power supply requirements for the ADS125H02IRHBT? The power supplies required 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 ADS125H02IRHBT? The operating temperature range is –40°C to +125°C.
- What package type is the ADS125H02IRHBT available in? The ADS125H02IRHBT is housed in a 5-mm × 5-mm VQFN package.
- What are some common applications for the ADS125H02IRHBT? Common applications include PLC analog input modules, test and measurement equipment, battery testing, and high-side current measurement.
