A 24-bit sigma-delta analog-to-digital converter provides a low power front end for bridge sensors, weigh scales, strain gages, and pressure measurement. The device includes one buffered differential analog input, an on-chip low noise programmable gain amplifier, an internal oscillator, and a 2-wire SPI-compatible read-only serial interface. Pin-programmable settings select gain of 1 or 128 and output update rates of 10 Hz or 16.7 Hz, with settling times of 300 ms or 120 ms. Operation is supported from 2.7 V to 5.25 V analog and digital supplies over a −40°C to +105°C temperature range. Package options include 14-lead narrow SOIC and 16-lead TSSOP variants.
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| ADC resolution | 24bit |
| ADC architecture | Sigma-delta |
| Analog input channels | 1 differential |
| Output update rate | 10 or 16.7Hz |
| Settling time | 300 at 10 Hz; 120 at 16.7 Hzms |
| Programmable gain | 1 or 128V/V |
| Differential input voltage range | ±VREF/gainV |
| No missing codes | 24bit |
| Integral nonlinearity | ±6 typppm of FSR |
| Analog supply voltage | 2.7 to 5.25V |
| Digital supply voltage | 2.7 to 5.25V |
| Supply current at gain 1 | 115 typ at 3 V; 130 typ, 160 max at 5 VµA |
| Supply current at gain 128 | 330 typ at 3 V; 420 typ, 500 max at 5 VµA |
| Power-down current | 10 typµA |
| Internal clock frequency | 64 ±3%kHz |
| Operating temperature | -40 to +105°C |
| Serial interface | 2-wire SPI-compatible read-only |
| Bridge power-down switch on resistance | 9 typohm |
| Bridge power-down switch current | 30 continuousmA |
| RMS noise at 3 V, gain 128 | 44 at 10 Hz; 65 at 16.7 HznV |
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