The ADC inputs can be connected to shunt resistors for bidirectional battery current measurements, to divider resistor networks for high voltage measurements, or to temperature sensors (such as thermistors or analog output temperature sensors).
The individual channels of the ADS131B04-Q1 ADC can be configured independently based on the sensor input. A low-noise programmable gain amplifier (PGA) provides gains ranging from 1 to 128 to amplify low-level signals. The device features a global cutoff mode to eliminate offset drift with temperature and time. Additionally, this device integrates offset and gain calibration registers to help eliminate errors in the signal chain. The device incorporates a 1.2V low-drift reference and a precision oscillator, reducing the printed circuit board (PCB) footprint. Optional cyclic redundancy checks (CRC) on the data input, data output, and register map maintain communication integrity.
The full analog front-end (AFE) is offered in a 20-pin TSSOP package and is specified in the automotive temperature range from -40°C to +125°C.
Features
- AEC-Q100 rated for automotive applications
- Operating temperature range: -40°C to +125°C, TA 1 temperature rating
- Documentation available to assist in functional safety system design
- Four simultaneous sampling differential input ADCs
- Programmable data rate up to 32kSPS
- Programmable gain up to 128
- Noise performance 0.82µVRMS at 1kSPS, gain = 8
- Global cutoff mode to eliminate temperature and time drift
- High impedance analog inputs for direct sensor connection
- Integrated negative charge pump allows measurement of the input signal below ground
- -120dB crosstalk between channels
- 1.2V low drift internal reference
- Precision internal oscillator
- Cyclic redundancy check (CRC) on communications and register map
- Analog and digital supplies: 2.7V to 3.6V, 5mW to 3.3V, AVDD and DVDD low energy consumption
Applications
- Automotive Battery Management Systems (BMS)
- Shunt current measurements
- Voltage measurements using external resistance dividers
- Temperature measurements using thermistors or analog output temperature sensors
- Electric vehicle charging stations
