Texas Instruments ADS1235/ADS1235-Q1 Delta-Sigma ADC
Texas Instruments ADS1235/ADS1235-Q1 Precision 7200SPS Delta-Sigma (ΔΣ) Analog-to-Digital Converter (ADC) comes with an integrated programmable gain amplifier (PGA). This device also includes diagnostic features such as PGA over range and reference monitors. The ADC provides high-accuracy, zero-drift conversion data for high-precision equipment, including weighing scales, strain gauges, and resistive pressure sensors.
The ADC has signal and reference multiplexers supporting three differential and two reference inputs. The ADC also includes a low-noise PGA that provides gains of 1, 64, and 128 and a 24-bit ΔΣ modulator and programmable digital filter. The high-impedance inputs (1GΩ) of the PGA reduce measurement error that is caused by sensor loading.
The ADC supports ac-bridge excitation to remove the drift errors from the sensor wiring. The ADC provides the clock control signals for the ac-excitation operation. The flexible digital filter is programmable for single-cycle settled conversions and provides 50Hz and 60Hz line cycle rejection at the same time. The ADS1235-Q1 devices are AEC-Q100 qualified for automotive applications.
Features
- 24-Bit, High-precision ADC
- 120,000 Noise-free counts (10mV input, 10SPS)
- Offset drift of 1nV/°C
- Gain drift of 0.5ppm/°C
- Three differential or five single-ended inputs
- Two reference inputs
- ±7mV to ±5V Wide input voltage range
- Low-noise PGA, Gain of 1, 64, and 128
- Data rate of 2.5 SPS to 7200SPS
- AC or DC-Bridge excitation option
- Chop mode for zero drift operation
- Simultaneous 50Hz and 60Hz rejection mode
- Single-cycle settling mode
- Missing reference input monitor
- Signal over-range monitor
- Temperature sensor
- Cyclic Redundancy Check (CRC)
- 5V or ±2.5V Power supply
Applications
- Weigh scales and strain-gauge digitizers
- Dynamic weigh systems
- Pressure measurement
- Process analytics
Datasheets
Associated Development Tool
Texas Instruments ADS1235EVM ADC Evaluation Module (EVM)
Platform for evaluating the ADS1235 analog-to-digital converter (ADC).
Functional Block Diagram
