ADS131B04-Q1

• AEC-Q100 qualified for automotive applications:
  • Temperature grade 1: –40°C to +125°C, T_A
• Functional Safety-Capable
  • Documentation available to aid functional safety system design
• 4 simultaneous-sampling, differential input ADCs
• Programmable data rate up to 32 kSPS
• Programmable gain up to 128
• Noise performance:
  • 0.82 µV_RMS at 1 kSPS, gain = 8
• Global-chop mode to remove offset drift over temperature and time
• High-impedance analog inputs for direct sensor connection
• Integrated negative charge pump allows input signal measurements below ground
• Crosstalk between channels: –120 dB
• Low-drift internal 1.2-V reference
• Precision internal oscillator
• Cyclic redundancy check (CRC) on communications and register map
• 2.7-V to 3.6-V analog and digital supplies
• Low power consumption: 5 mW at 3.3-V AVDD and DVDD

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The ADS131B04-Q1 is a four-channel, simultaneous-sampling, 24-bit, delta-sigma (ΔΣ) analog-to-digital converter (ADC) that offers wide dynamic range, low power, and buffered analog inputs, making the device an excellent fit for automotive battery management systems (BMS). The ADC inputs can be directly interfaced to shunt resistors for bidirectional battery-current measurements, to resistor-divider networks for high-voltage measurements, or to temperature sensors (such as thermistors or analog output temperature sensors).

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. The device features a global-chop mode to remove offset drift over temperature and time. Additionally, this device integrates offset and gain calibration registers to help remove signal-chain errors.

A low-drift, 1.2-V reference and precision oscillator are integrated into the device reducing printed circuit board (PCB) area. Optional cyclic redundancy checks (CRCs) on the data input, data output, and register map maintain communication integrity.

The complete analog front-end (AFE) is offered in a 20-pin TSSOP package and is specified over the automotive temperature range of –40°C to +125°C.