ADS1120IRVAR

The ADS1120 is a 16-bit high-precision analog-to-digital converter (ADC) that integrates various features, capable of reducing system cost and the number of components in small sensor signal measurement applications. This device features two differential inputs or four single-ended inputs implemented through an input multiplexer (MUX), a low-noise programmable gain amplifier (PGA), two programmable excitation current sources, a voltage reference, an oscillator, a low-side switch, and a precision temperature sensor. This device can perform conversions at a sampling data rate of up to 2000 samples per second (SPS) and can stabilize within a single cycle. For industrial applications in noisy environments, the digital filter can provide both 50Hz and 60Hz rejection when the sampling frequency is 20SPS. The internal PGA provides a gain of up to 128V/V. This PGA makes the ADS1120 well-suited for small sensor signal measurement applications, such as resistance temperature detectors (RTDs), thermocouples, thermistors, and bridge sensors. This device supports the measurement of pseudo-differential or fully differential signals when using the PGA. Additionally, the device can be configured to disable the internal PGA while still providing high input impedance and a gain of up to 4V/V, enabling single-ended measurements. The power consumption can be as low as 120μA when operating in the duty cycle mode after disabling the PGA. The ADS1120 is available in a leadless VQFN - 16 or thin small outline package (TSSOP) - 16, with a rated operating temperature range from - 40°C to + 125°C.

Applications

• Temperature sensor measurement:
• Thermistor
• Thermocouple
• RTD: 2-wire, 3-wire, or 4-wire types
• Resistive bridge sensor measurement:
• Pressure sensor
• Strain gauge
• Weighing instrument
• Portable instrumentation
• Factory automation and process control

Key features

• Low current consumption: as low as 120μA (typical) in duty-cycle mode
• Wide supply range: 2.3V to 5.5V
• Programmable gain: 1V/V to 128V/V
• Programmable data rate: up to 2kSPS
• 16-bit noise-free resolution (at 20SPS)
• Single-cycle settling digital filter with 50Hz and 60Hz notch rejection at 20SPS
• Two differential inputs or four single-ended inputs
• Dual matched programmable current sources: 50μA to 1.5mA
• Internal 2.048V reference: 5ppm/°C drift (typical)
• Integrated 2% accuracy oscillator
• Integrated temperature sensor: 0.5°C accuracy (typical)
• SPI-compatible interface (Mode 1)
• Package: 3.5mm×3.5mm×0.9mm ultra-thin VQFN