Low-noise precision analog front end integrates a 24-bit sigma-delta ADC for high-precision measurement applications. The input mux supports four differential or eight pseudodifferential inputs with a programmable gain amplifier from 0.5 to 128. Output data rates span 3.8 SPS to 62.5 kSPS, with flexible digital filters and simultaneous 50 Hz and 60 Hz rejection. The device operates from a 4.75 V to 5.25 V analog supply and a 1.7 V to 5.25 V digital supply. A 32-lead 4 mm × 6 mm LFCSP package supports operation over the −40 °C to +105 °C performance temperature range.
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| ADC resolution | 24bit |
| Output data rate | 3.8 to 62,500SPS |
| Analog input channels | 4 differential or 8 pseudodifferential |
| Input referred noise | 10 at 3.8 SPS, gain = 128nV |
| Programmable gain | 0.5, 1, 2, 4, 8, 16, 32, 64, 128 |
| Analog supply voltage | 4.75 to 5.25V |
| Digital supply voltage | 1.7 to 5.25V |
| Internal reference voltage | 2.5V |
| Reference temperature coefficient | ±5 typppm/°C |
| Internal clock frequency | 16MHz |
| External clock frequency | 1 to 17MHz |
| Excitation current settings | 10, 50, 100, 250, 500, 1000, 1500µA |
| GPIO count | 4 |
| Performance temperature range | -40 to +105°C |
| Functional temperature range | -40 to +125°C |
| Package body size | 4 x 6mm |
| Package pin count | 32 |
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These are design resources that include the Analog Devices AD4190-4
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.
