1 Features

? AEC-Q100 qualified for automotive applications:

– Temperature grade 1: –40°C to +125°C, TA

? Functional Safety-Capable

– Documentation available to aid functional safety

system design

? 8 simultaneously sampling differential inputs

? Programmable data rate up to 32 kSPS

? Programmable gain up to 128

? Noise performance:

– 102-dB dynamic range at gain = 1, 4 kSPS

– 80-dB dynamic range at gain = 64, 4 kSPS

? Total harmonic distortion: –100 dB

? High-impedance inputs for direct sensor

connection:

– 330-kΩ input impedance for gains of

1, 2, and 4

– ≥1-MΩ input impedance for gains of

8, 16, 32, 64, and 128

? Programmable channel-to-channel phase delay

calibration:

– Resolution = 244 ns, fCLKIN = 8.192 MHz

? Fast start-up: First data within 0.5 ms of supply

ramp

? Integrated negative charge pump allows input

signals below ground

? Crosstalk between channels: –120 dB

? Low-drift internal voltage reference

? Cyclic redundancy check (CRC) on

communications and register map

? Analog and digital supplies: 2.7 V to 3.6 V

? Low-power consumption: 6.0 mW at 3-V AVDD

and DVDD

? Package: 32-pin TQFP

2 Applications

? Automotive battery management systems (BMS):

– Current-shunt measurements

– Voltage measurements using external resistor

dividers

– Temperature measurements using thermistors

or analog output temperature sensors

? EV charging stations:

– DC e-metering

– AC e-metering

? Energy storage systems (ESS)

3 Description

The ADS131M08-Q1 is a eight-channel,

simultaneously sampling, 24-bit, delta-sigma (ΔΣ),

analog-to-digital converter (ADC) that offers wide

dynamic range and low power, making the

device designed for automotive battery management

systems (BMS). The ADC inputs can be directly

interfaced to shunt resistors for bidirectional batterycurrent

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 lownoise,

programmable gain amplifier (PGA) provides

gains ranging from 1 to 128 to amplify low-level

signals. Additionally, this device integrates channelto-

channel phase calibration and offset and gain

calibration registers to help remove signal-chain

errors.

A low-drift, 1.2-V reference is 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 32-pin TQFP package and is specified over the

automotive temperature range of –40°C to +125°C.