Texas Instruments ADS131M02/ADS131M02-Q1 Delta-Sigma ADC
Texas Instruments ADS131M02/ADS131M02-Q1 Delta-Sigma Analog-to-Digital Converter (ADC) is a two-channel, simultaneously-sampling, 24-bit, delta-sigma (ΔΣ) ADC that offers wide dynamic range and low power. It also offers 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, shunt, 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. Additionally, this device integrates channel-to-channel phase calibration and offset and gain calibration registers to help remove signal-chain errors.
A low-drift, 1.2V reference is integrated into the Texas Instruments ADS131M02/ADS131M02-Q1 reducing printed circuit board (PCB) area. Cyclic redundancy check (CRC) options can be individually enabled on the data input, data output, and register map to ensure communication integrity. The complete analog front-end (AFE) is offered in a 20-pin TSSOP or leadless 20-pin WQFN package and is specified over the industrial temperature range of –40°C to +125°C. The ADS131M02-Q1 devices are AEC-Q100 qualified for automotive applications.
Features
- Two simultaneously sampling differential inputs
- Programmable data rate up to 32kSPS
- Programmable gain up to 128
- Noise performance
- 102dB dynamic range at gain = 1, 4kSPS
- 80dB dynamic range at gain = 64, 4kSPS
- –100dB total harmonic distortion
- High-impedance inputs for direct sensor connection
- 330kΩ input impedance for gains of 1, 2, and 4
- 1MΩ input impedance for gains of 8, 16, 32, and 64
- Programmable channel-to-channel phase delay calibration
- 244ns resolution, 8.192MHz fCLKIN
- Current-detect mode allows for extremely low power tamper detection
- Integrated negative charge pump allows input signals below ground
- –120dB crosstalk between channels
- A low-drift internal voltage reference
- Cyclic redundancy check (CRC) on communications and register map
- 2.7V to 3.6V analog and digital supplies
- 2.3mW at 3V AVDD and DVDD low power consumption
- 20-pin TSSOP or 20-pin WQFN packages
- –40°C to +125°C operating temperature range
Applications
- Electricity meters (commercial and residential)
- Circuit breakers
- Protection relays
- Power quality meters
- Battery test equipment
- Battery management systems
Datasheets
Functional Block Diagram
Related Development Tool
Texas Instruments ADS131M04EVM Evaluation Module
A platform for evaluating the performance of the ADS131M04 a 4-ch, 24-bit, delta-sigma (ΔΣ) ADC.