8-Channel 24-Bit Delta-Sigma ADC - Texas Instruments
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ADS131M08
SBAS950A – OCTOBER 2019 – REVISED DECEMBER 2019
ADS131M08 8-Channel, Simultaneously-Sampling, 24-Bit, Delta-Sigma ADC
1 Features
•1 8 simultaneously sampling differential inputs • Programmable data rate up to 32 kSPS • Programmable gain up to 128 • Noise performance:
– 102-dB dynamic range at gain = 1, 4 kSPS – 80-dB dynamic range at gain = 64, 4 kSPS • Total harmonic distortion: –100 dB • High-impedance inputs for direct sensor connection: – 330-kΩ input impedance for gains of
1, 2, and 4 – 1-MΩ input impedance for gains of
8, 16, 32, and 64 • Programmable channel-to-channel phase delay
calibration: – 244-ns resolution, 8.
192-MHz fCLKIN • Current-detect mode allows for extremely low power tamper detection • Fast startup: first data within 0.
5 ms of supply ramp • Integrated negative charge pump allows input signals below ground • Crosstalk between channels: –120 dB • Low-drift internal voltage reference • Cyclic redundancy check (CRC) on communications and register map • 2.
7-V to 3.
6-V analog and digital supplies • Low power consumption: 6.
0 mW at 3-V AVDD and DVDD • Package: 32-pin TQFP or 32-pin WQFN (preview) • Operating temperature range: –40°C to +125°C
2 Applications
• Electricity meters: commercial and residential • Circuit breakers • Battery test equipment • Battery management systems
3 Description
The ADS131M08 is a eight-channel, simultaneouslysampling, 24-bit, delta-sigma (ΔΣ), analog-to-digital converter (ADC) that offers wide dynamic range, low power, and energy-measurement-specific features, making the device an excellent fit for energy metering, power metrology, and circuit breaker applications.
The ADC inputs can be directly interfaced to a resistor-divider network or a power transformer to measure voltage or to a current transformer or a Rogowski coil to measure current.
The individual ADC channels can be independently configured depending on the senso...
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