Summary of ADS131M08 8-CHANNEL SIMULTANEOUS SAMPLING DELTA-SIGMA (ΔΣ) ADC
The Texas Instruments ADS131M08 is an 8-channel, 24-bit, simultaneously-sampling ΔΣ ADC designed for cost-sensitive energy metering and power metrology. It features a programmable gain amplifier (PGA), low power consumption, and integrated calibration to minimize signal-chain errors. The device supports direct interfacing with various sensors like voltage dividers, current transformers, and Rogowski coils, making it ideal for circuit breakers and battery management systems.
Parts used in the ADS131M08 Project:
- Texas Instruments ADS131M08 8-channel ADC
- Resistor-divider network
- Power transformer
- Current transformer
- Rogowski coil
- Low-noise programmable gain amplifier (PGA)
Texas Instruments’ 24-bit, 32 kSPS ADC is optimized for cost-sensitive applications that require simultaneous sampling
Texas Instruments’ ADS131M08 8-channel, simultaneously-sampling, 24-bit ΔΣ ADC offers wide dynamic range, low power, and energy-measurement-specific features. These features make the device ideal for energy metering, power metrology, and circuit breaker applications. The ADC inputs can be directly interfaced with 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 sensor input. A low-noise programmable gain amplifier (PGA) provides gains ranging from 1 to 128 to amplify low-level signals. This device integrates channel-to-channel phase calibration and offset and gain calibration registers to help remove signal-chain errors.
Features
- Eight simultaneously sampling differential inputs
- Programmable data-rate up to 32 kSPS
- Programmable gain up to 128
- Noise performance:
- Dynamic ranges: 102 dB (gain = 1, 4 kSPS), 80 dB (gain = 64, 4 kSPS)
- High-impedance inputs for direct sensor connection:
- Input impedance for gains of 1, 2, and 4 (330 kΩ), 8, 16, 32, and 64 (1 MΩ)
- Programmable channel-to-channel phase delay calibration:
- 244 ns resolution, 8.192 MHz fCLKINTotal harmonic distortion: -100 dB
- Current-detect mode allows for extremely low power tamper detection
- Fast startup: first data within 0.5 ms of the supply ramp
- Integrated negative charge pump allows input signals below ground
- Crosstalk between channels: -120 dB
- Low-drift internal voltage reference
- CRC on communications and the register map
- Analog and digital supplies: 2.7 V to 3.6 V
- Low power consumption: 6.0 mW at 3 V AVDD and DVDD
- Package: 32-pin TQFP or 32-pin WQFN
- Operating temperature range: -40°C to +125°C
Applications
- Electricity meters: commercial and residential
- Circuit breakers
- Battery test equipment
- Battery management systems
Read more: ADS131M08 8-CHANNEL SIMULTANEOUS SAMPLING DELTA-SIGMA (ΔΣ) ADC
- What are the primary applications for this device?
The device is ideal for energy metering, power metrology, circuit breaker applications, electricity meters, battery test equipment, and battery management systems. - How can the ADC inputs be directly interfaced?
Inputs connect to a resistor-divider network or power transformer for voltage measurement, or to a current transformer or Rogowski coil for current measurement. - Can individual channels be configured independently?
Yes, the individual ADC channels can be independently configured depending on the sensor input. - What is the maximum programmable gain available?
The programmable gain ranges from 1 to 128. - Does the device support simultaneous sampling?
Yes, it offers eight simultaneously sampling differential inputs. - What is the fast startup time of the device?
The first data is available within 0.5 ms of the supply ramp. - How does the device handle signals below ground?
An integrated negative charge pump allows input signals below ground. - What is the operating temperature range?
The operating temperature range is -40°C to +125°C.
