Overview
The Texas Instruments ADS131M08IRSNR is an eight-channel, simultaneously-sampling, 24-bit, delta-sigma (ΔΣ) analog-to-digital converter (ADC). This device is designed to offer a wide dynamic range, low power consumption, and energy-measurement-specific features, making it an excellent fit for applications such as energy metering, power metrology, and circuit breaker systems. The ADC allows for direct interface with various sensors, including resistor-divider networks, power transformers, current transformers, and Rogowski coils, to measure voltage and current. It features a low-noise, programmable gain amplifier (PGA) and integrates channel-to-channel phase calibration and offset and gain calibration registers to minimize signal-chain errors.
Key Specifications
| Parameter | Value |
|---|---|
| Number of Channels | 8 |
| Resolution | 24-bit |
| Sampling Rate | Up to 32 kSPS |
| Programmable Gain | Up to 128 |
| Dynamic Range | 102 dB at gain = 1, 4 kSPS; 80 dB at gain = 64, 4 kSPS |
| Total Harmonic Distortion | –100 dB |
| Input Impedance | 330 kΩ for gains of 1, 2, and 4; ≥ 1 MΩ for gains of 8, 16, 32, 64, and 128 |
| Supply Voltage | 2.7 V to 3.6 V (AVDD and DVDD) |
| Power Consumption | 6.0 mW at 3 V AVDD and DVDD |
| Operating Temperature Range | –40°C to +125°C |
| Package Options | 32-pin TQFP, 32-pin WQFN |
Key Features
- Eight simultaneously sampling differential inputs
- Programmable data rate up to 32 kSPS
- Programmable gain up to 128
- High-impedance inputs for direct sensor connection
- Programmable channel-to-channel phase delay calibration with 244 ns resolution
- Current-detect mode 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
Applications
- Commercial and industrial electricity meters
- Circuit breakers
- Battery test equipment
- Battery management systems
- Automotive applications (ADS131M08-Q1 is AEC-Q100 qualified)
Q & A
- What is the resolution of the ADS131M08 ADC?
The ADS131M08 is a 24-bit analog-to-digital converter.
- What is the maximum sampling rate of the ADS131M08?
The maximum sampling rate is up to 32 kSPS.
- What are the programmable gain options for the ADS131M08?
The programmable gain ranges from 1 to 128.
- What is the dynamic range of the ADS131M08 at different gains?
The dynamic range is 102 dB at gain = 1, 4 kSPS, and 80 dB at gain = 64, 4 kSPS.
- What is the input impedance of the ADS131M08 at different gains?
The input impedance is 330 kΩ for gains of 1, 2, and 4, and ≥ 1 MΩ for gains of 8, 16, 32, 64, and 128.
- What are the supply voltage and power consumption of the ADS131M08?
The supply voltage is 2.7 V to 3.6 V (AVDD and DVDD), and the power consumption is 6.0 mW at 3 V AVDD and DVDD.
- What are the package options for the ADS131M08?
The device is available in 32-pin TQFP and 32-pin WQFN packages.
- What is the operating temperature range of the ADS131M08?
The operating temperature range is –40°C to +125°C.
- Does the ADS131M08 support automotive applications?
- What calibration features are available in the ADS131M08?
The device includes programmable channel-to-channel phase delay calibration and offset and gain calibration registers.
