Texas Instruments ADS1235 Delta-Sigma Analog-to-Digital Converter
Texas Instruments ADS1235 Delta-Sigma Analog-to-Digital Converter
Texas Instruments ADS1235 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 that support three differential signal inputs 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.
Features
24-Bit, High-Precision ADC
120,000 Noise-Free Counts (10mV Input, 10SPS)
Offset Drift: 1nV/°C
Gain Drift: 0.5ppm/°C
Three Differential or Five Single-Ended Inputs
Two Reference Inputs
Wide Input Voltage Range: ±7mV to ±5V
Low-Noise PGA, Gain: 1, 64, and 128
Data Rate: 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 Overrange 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
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