1 Features

1• 2 or 4 simultaneous-sampling differential inputs

• Data rates up to 128 kSPS

• High performance:

– Single-channel accuracy: better than 0.1% at

10,000:1 dynamic range

– Effective resolution: 20.6 bits at 8 kSPS

– THD: –100 dB at 50 Hz and 60 Hz

• Integrated negative charge pump allows absolute

input voltages below ground

• Flexible analog power-supply operation:

– Using negative charge pump: 3.0 V to 3.45 V

– Unipolar supply: 3.3 V to 5.5 V

– Bipolar supply: ±2.5 V

• Digital supply: 1.65 V to 3.6 V

• Low-drift internal voltage reference: 6 ppm/°C

• ADC self checks

• Cyclic redundancy check (CRC) and hamming

code error correction on communications

• Multiple SPI data interface modes:

– Asynchronous interrupt

– Synchronous master and slave

• Package: 32-pin TQFP

• Operating temperature range:

–40°C to +125°C

2 Applications

• Electricity meters: commercial and residential

• Circuit breakers

• Battery test equipment

• Battery management systems

• Data acquisition systems

3 Description

The ADS131A02 and ADS131A04 devices are twoand

four-channel, simultaneous-sampling, 24-bit,

delta-sigma (ΔΣ), analog-to-digital converters (ADCs).

The wide dynamic range, with scalable data rates up

to 128 kSPS, and internal fault monitors make the

ADS131A02 or ADS131A04 a good choice when

designing for energy monitoring, grid protection, and

control applications. The ADC inputs can be

independently and directly interfaced to a resistordivider

network, a current transformer, or a Rogowski

coil to measure voltage or current. Flexible powersupply

options, including an internal negative charge

pump, are available to maximize the effective

resolution for high dynamic range applications.

Asynchronous and synchronous master and slave

interface options are available, providing ADC

configuration flexibility when chaining multiple devices

in a single system. Several interface checks, ADC

startup checks, and data integrity checks can be

enabled on the interface to report errors in the ADC

and during data transfer.

The complete analog front-end (AFE) solutions are

packaged in a 32-pin TQFP package and are

specified over the industrial temperature range of

–40°C to +125°C.