Automotive 24-bit, 32-kSPS, two-channel, simultaneous-sampling, delta-sigma ADC

The ADS131B02-Q1 is a two-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.