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.