Seven-channel sigma-delta ADC provides simultaneous 24-bit sampling for polyphase energy metering, branch monitoring, power quality monitoring, circuit breakers, and related measurement systems. The converter supports programmable sample rates up to 64 kSPS and differential analog inputs with ±1.2 V full-scale range at 1x gain. An integrated 1.25 V reference, per-channel gain, phase, and offset compensation, and DSP filtering support current transformers, shunts, voltage dividers, and Rogowski coil interfaces. The device operates from a 3.3 V supply over a −40°C to +125°C temperature range and communicates through a 4-wire SPI interface with CRC and daisy-chain functionality. It is supplied in a 32-lead 5 mm × 5 mm LFCSP package with RoHS-compliant ordering options.
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| Converter Type | Sigma-delta ADC |
| Resolution | 24bit |
| Number of ADC Channels | 7 |
| Sampling Mode | Simultaneous sampling |
| Maximum Programmable Sample Rate | 64kSPS |
| Supply Voltage | 3.3 ±10%V |
| High Resolution Supply Current | 11.5 typ, 13.1 maxmA |
| Default Configuration Supply Current | 5.4 typ, 6.3 maxmA |
| Low Power Supply Current | 2.2 typ, 2.8 maxmA |
| Standby/Reset Power | 4µW |
| Internal Voltage Reference | 1.25V |
| Reference Temperature Coefficient | 5 typ, 15 maxppm/°C |
| Differential Input Range at 1x Gain | ±1.2V |
| Differential Input Range at 2x Gain | ±0.6V |
| Signal-to-Noise Ratio at 4 kSPS, 1x Gain | 102 typdBFS |
| SPI SCLK Frequency | 250 to 22000kHz |
| External Clock Input Frequency | 0.3 to 16.547MHz |
| Operating Temperature Range | −40 to +125°C |
| Package | 32-lead LFCSP, 5 mm × 5 mm × 0.75 mm |
| Moisture Sensitivity Level | MSL 3 |
| RoHS | Compliant |
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Calibration guide for ADEMA124/ADEMA127 energy measurement ICs. Details ADC/DSP configuration and gain/phase calibration for voltage dividers, CTs, and Rogowski coils.
User guide for the EVAL-ADEMA127KTZ evaluation kit featuring ADEMA124 and ADEMA127 sigma-delta ADCs for 3-phase energy measurement applications.
