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.