Texas Instruments' ADS131A02/04 is a two- or four-channel, simultaneous-sampling, 24-bit, delta-sigma (ΔΣ) analog-to-digital converter (ADC). The wide dynamic range, scalable data rates, and internal fault monitors make the ADS131A02/04 ideally suited for energy monitoring, protection, and control applications.
The ADC inputs can be independently and directly interfaced to a resistor-divider network, a transformer (to measure voltage or current), or a Rogowski coil (to measure current). Flexible power-supply options, including an internal negative-charge pump, are available to maximize the effective number of bits (ENOB) for high dynamic range applications.
Asynchronous and synchronous master and slave interface options are available, providing ADC configuration flexibility when chaining multiple devices in a single system. Several interface checks, ADC startup checks, and data integrity checks can be enabled on the interface to report errors in the ADC and during data transfer.
The ADS131A02/04 supports data rates up to 128 kSPS. The complete analog front-end (AFE) solution is packaged in a 32-pin TQFP package and is specified over the industrial temperature range of -40°C to 125°C.
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- Two or four simultaneous-sampling differential inputs
- Data rates up to 128 kSPS
- Noise performance:
- Single-channel accuracy, better than 0.1% at 10,000:1 dynamic range
- ENOB: 19.1 bits at 8 kSPS
- THD: -100 dB at 50 Hz and 60 Hz
- Integrated negative-charge pump
- Flexible analog power-supply operation:
- Using negative-charge pump: 3 V to 3.45 V
- Unipolar supply: 3.3 V to 5.5 V
- Bipolar supply: ±2.5 V
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- Digital supply: 1.65 V to 3.6 V
- Low-drift internal voltage reference: 4 ppm/°C
- ADC self-checks
- Cyclic redundancy check (CRC) and hamming code error correction on communications
- Multiple SPI™ data interface modes:
- Asynchronous interrupt
- Synchronous master and slave
- Package: 32-pin TQFP
- Operating temperature range: -40°C to 125°C
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Texas Instruments' ADS131A02/04 is a two- or four-channel, simultaneous-sampling, 24-bit, delta-sigma (ΔΣ) analog-to-digital converter (ADC). The wide dynamic range, scalable data rates, and internal fault monitors make the ADS131A02/04 ideally suited for energy monitoring, protection, and control applications. 
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