Texas Instruments ADS125H01 24-Bit Delta-Sigma ADC
Texas Instruments ADS125H01 24-Bit Delta-Sigma (ΔΣ) Analog-to-Digital Converter (ADC) features a low-noise programmable gain amplifier (PGA), a clock oscillator, and signal or reference out-of-range monitors. The integration of a wide input range, ±18V supply PGA and an ADC into a single package reduces board area up to 50% compared to discrete solutions.
Programmable attenuation and gain of 0.125 to 128 (corresponding to an equivalent input range from ±20V to ±20mV) eliminates the need for an external attenuator or external gain stages. A 1GΩ minimum input impedance reduces the error resulting from sensor loading. Additionally, the low-noise and low-drift performance allow direct connections to strain-gauge bridge and thermocouple sensors that are affected by high common-mode voltage.
The digital filter is programmable over a wide range from 2.5SPS to 40kSPS. Attenuation of 50Hz and 60Hz line cycle noise for data rates ≤ 50SPS or 60SPS reduces measurement error. In most data rates, the filter provides no-latency conversion data for high data throughput during external channel sequencing. The Texas Instruments ADS125H01 is housed in a 5mm × 5mm VQFN package and is fully specified over the –40°C to +125°C temperature range.
Features
- ±20V input, 24-bit delta-sigma ADC
- 2.5SPS to 40kSPS programmable data rate
- High-voltage, 1GΩ input impedance PGA
- Up to ±20V differential input range
- Up to ±15.5V absolute input range
- Programmable attenuation and gain
- 0.125 to 128
- High-performance ADC
- 45nVRMS (gain = 128, 20SPS) noise
- 105dB CMRR
- 95dB 50Hz and 60Hz rejection
- 10nV/°C offset drift
- 1ppm/°C gain drift
- 2ppm INL
- Integrated features and diagnostics
- Internal oscillator
- Signal and reference voltage monitors
- Cyclic redundancy check (CRC)
- Power supplies
- 4.75V to 5.25V AVDD
- 2.7V to 5.25V DVDD
- ±5V to ±18V HVDD
- –40°C to +125°C operating temperature
- 5mm × 5mm VQFN package
Applications
- PLC analog input modules
- Voltage (±10V or 0V to 5V)
- Current (4mA to 20mA with shunt)
- Battery tests
- Data acquisition (DAQ)
- High common-mode voltage inputs
- High-side current measurement
Functional Block Diagram
Related Development Tool
Texas Instruments ADS125H02EVM Evaluation Module Kit
Configured to evaluate the operation of the ADS125H02 ADC with PGA.