Low-noise integrated analog front end includes a 24-bit sigma-delta ADC for high precision measurement applications. The converter supports four differential or eight single-ended or pseudodifferential inputs with an integrated PGA programmable from 0.5 to 128. Output data rates span 3.8 SPS to 62.5 kSPS, and the device includes flexible digital filters with simultaneous 50 Hz and 60 Hz rejection. Integrated functions include a 2.5 V reference, excitation current sources, bias voltage generation, GPIO, diagnostics, calibration, an internal oscillator, and SPI-compatible serial communication. Operation is specified from −40 °C to +105 °C, with functional operation to +125 °C in a 32-lead 4 mm × 6 mm LFCSP package.
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| ADC resolution | 24bit |
| ADC architecture | Sigma-delta |
| Input channels | 4 differential or 8 single-ended/pseudodifferential |
| Maximum output data rate | 62500SPS |
| Minimum output data rate | 3.8SPS |
| Input referred noise | 10 at 3.8 SPS, gain = 128nV |
| PGA gain range | 0.5 to 128 |
| Analog supply voltage | 4.75 to 5.25 or ±2.5V |
| Digital supply voltage | 1.7 to 5.25V |
| Internal reference voltage | 2.5V |
| Internal reference drift | 5 typicalppm/°C |
| Excitation current settings | 10, 50, 100, 250, 500, 1000, 1500µA |
| Internal clock frequency | 16MHz |
| Serial interface | 3-wire or 4-wire SPI, QSPI, MICROWIRE, DSP compatible |
| GPIO count | 4 |
| Performance temperature range | -40 to +105°C |
| Functional temperature range | -40 to +125°C |
| Package | 32-lead 4 mm × 6 mm LFCSP |
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These are design resources that include the Analog Devices AD4195-4
Reference design for a precision weigh scale using the AD4190-4 24-bit Sigma-Delta ADC. Includes integrated PGA, low-noise power regulation, and support for 6-wire load cells.
