Texas Instruments ADS131M04/ADS131M04-Q1 4-Channel ADC
Texas Instruments ADS131M04/ADS131M04-Q1 4-Channel Analog-to-Digital Converter (ADC) is a 24-bit delta-sigma (ΔΣ) ADC that offers a wide dynamic range, low power, and energy-measurement-specific features. This feature makes these devices excellent 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 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 device, reducing the 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) solution 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 Texas Instruments ADS131M04-Q1 devices are AEC-Q100 qualified for automotive applications.
Features
- Four 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
- Total harmonic distortion: –100dB
- High-impedance inputs for direct sensor connection
- 300kΩ 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
- The current detect mode allows for super low-power tamper detection
- Fast startup: first data within 0.5ms of the supply ramp
- An 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
- Low power consumption of 3.3mW at 3V AVDD and DVDD
- 20-pin TSSOP or 20-pin WQFN package
- –40°C to +125°C operating temperature range
Applications
- Electricity meters (commercial and residential)
- Circuit breakers
- 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.