A low power, low noise integrated analog front end provides a 24-bit sigma-delta ADC for precision measurement applications. The converter supports 8 differential inputs or 15 single-ended or pseudo differential inputs, with programmable gain from 1 to 128 and per-channel configuration. Three power modes trade current consumption, noise, and output data rate, with output rates up to 19.2 kSPS in full-power mode. The device operates from a 2.7 V to 3.6 V analog supply or dual 1.8 V supplies, uses an independent 1.65 V to 3.6 V interface supply, and is specified from -40 °C to +125 °C. It includes an internal reference, excitation currents, calibration, diagnostics, CRC support, and a 3-wire or 4-wire SPI-compatible serial interface in a 32-lead LFCSP package.
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| ADC Resolution | 24bit |
| Input Channels | 8 differential or 15 single-ended/pseudo differential |
| ADC Architecture | Sigma-delta |
| Programmable Gain | 1 to 128V/V |
| Output Data Rate, Full Power | 9.38 to 19200SPS |
| Output Data Rate, Mid Power | 2.34 to 4800SPS |
| Output Data Rate, Low Power | 1.17 to 2400SPS |
| RMS Noise, Low Power, Gain 128 | 24 at 1.17 SPSnV rms |
| RMS Noise, Mid Power, Gain 128 | 20 at 2.34 SPSnV rms |
| RMS Noise, Full Power, Gain 128 | 23 at 9.4 SPSnV rms |
| Noise-Free Resolution | Up to 22 at gain = 1bit |
| Analog Supply Voltage | 2.7 to 3.6 or ±1.8V |
| Interface Supply Voltage | 1.65 to 3.6V |
| Power-Down Current | 5 maximumµA |
| Operating Temperature Range | -40 to +125°C |
| Reference Drift | 10 maximumppm/°C |
| Serial Interface | 3-wire or 4-wire SPI, QSPI, MICROWIRE, DSP compatible |
| ESD Rating | 4kV |
| Package | 32-lead LFCSP |
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