The ADS1131 is a precision, 18-bit analog-to-digital converter (ADC). With an onboard, low-noise amplifier, onboard oscillator, precision 18-bit delta-sigma (ΔΣ) ADC, and bridge power switch, the ADS1131 provides a complete front-end solution for bridge sensor applications including weigh scales, strain gauges, and load cells.
The low-noise amplifier has a gain of 64, supporting a full-scale differential input of ±39mV. The ΔΣ ADC has 18-bit effective resolution and is comprised of a third-order modulator and fourth-order digital filter. Two data rates are supported: 10SPS (with both 50Hz and 60Hz rejection) and 80SPS. The ADS1131 can be put into a low-power standby mode or shut off completely in power-down mode.
The ADS1131 is controlled by dedicated pins; there are no digital registers to program. Data are output over an easily-isolated serial interface that connects directly to the MSP430 and other microcontrollers.
The ADS1131 is available in an SO-16 package and is specified from –40°C to +85°C.
| Resolution (Bits) | 18 |
| Sample rate (max) (ksps) | 0.08 |
| Number of input channels | 1 |
| Interface type | SPI |
| Architecture | Delta-Sigma |
| Input type | Differential, Single-ended |
| Rating | Catalog |
| Reference mode | External |
| Input voltage range (max) (V) | 0.041 |
| Input voltage range (min) (V) | 0 |
| Features | 50/60 Hz Rejection, Oscillator, PGA |
| Operating temperature range (°C) | -40 to 85 |
| Power consumption (typ) (mW) | 2.9 |
| Analog supply (min) (V) | 3 |
| Analog supply voltage (max) (V) | 5.3 |
| Digital supply (min) (V) | 3 |
| Digital supply (max) (V) | 5.3 |
| SOIC (D) | 16 | 59.4 mm² 9.9 x 6 |
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