1 Features

• 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:

– Input impedance 330-kΩ for gains of

1, 2, and 4

– Input impedance ≥ 1-MΩ for gains of

8, 16, 32, 64, and 128

• Programmable channel-to-channel phase delay

calibration:

– 244-ns resolution, 8.192-MHz fCLKIN

• Current-detect mode allows for extremely low

power tamper detection

• Fast startup: 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

• 2.7-V to 3.6-V analog and digital supplies

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

and DVDD

• Packages: 32-pin TQFP or 32-pin WQFN

• Operating temperature range: –40°C to +125°C

2 Applications

• Electricity meters: commercial and residential

• Circuit breakers

• Protection relays

• Power quality meters

• Battery test equipment

• Battery management systems

3 Description

The ADS131M08 is a eight-channel, simultaneouslysampling,

24-bit, delta-sigma (ΔΣ), analog-to-digital

converter (ADC) that offers wide dynamic range, low

power, and energy-measurement-specific features,

making the device an excellent fit for energy metering,

power metrology, and circuit breaker applications. The

ADC inputs can be directly interfaced to a resistordivider

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 lownoise,

programmable gain amplifier (PGA) provides

gains ranging from 1 to 128 to amplify low-level

signals. Additionally, this device integrates channel-tochannel

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 or a leadless 32-pin WQFN

package and is specified over the industrial

temperature range of –40°C to +125°C.