ADS131M03
ADS131M03
www.ti.com
SBAS889A – JANUARY 2020 – REVISED APRIL 2021
SBAS889A – JANUARY 2020 – REVISED APRIL 2021
ADS131M03 3-Channel, Simultaneously-Sampling, 24-Bit, Delta-Sigma ADC
1 Features
3 Description
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3 simultaneously sampling differential inputs
Programmable data rate up to 64 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
The ADS131M03 is a three-channel, simultaneously-
sampling, 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 resistor-
divider network or a power transformer to measure
voltage or to a current transformer, shunt, or a
Rogowski coil to measure current.
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The individual ADC channels can be independently
configured depending on the sensor input. A low-
noise, programmable gain amplifier (PGA) provides
gains ranging from 1 to 128 to amplify low-level
signals. Additionally, this device integrates channel-
to-channel phase calibration and offset and gain
calibration registers to help remove signal-chain
errors.
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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.
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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: 3.6 mW at 3-V AVDD
and DVDD
The complete analog front-end (AFE) is offered
in a 20-pin TSSOP package or a leadless 20-pin
WQFN package and is specified over the industrial
temperature range of –40°C to +125°C.
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Device Information(1)
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Packages:
PART NUMBER
PACKAGE
TSSOP (20)
WQFN (20)
BODY SIZE (NOM)
6.50 mm × 4.40 mm
3.00 mm × 3.00 mm
– 20-pin TSSOP or 20-pin WQFN
Operating temperature range: –40°C to +125°C
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ADS131M03
2 Applications
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
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Electricity meters: commercial and residential
Circuit breakers
Protection relays
Power quality meters
Battery test equipment
AVDD
DVDD
1.2-V
Reference
Battery management systems
AIN0P
AIN0N
+
Phase Shift &
Digital Filter
Gain & Offset
Calibration
DS ADC
DS ADC
DS ADC
SYNC / RESET
œ
CS
SCLK
AIN1P
AIN1N
+
Phase Shift &
Digital Filter
Gain & Offset
Calibration
Control &
Serial Interface
DIN
œ
DOUT
DRDY
AIN2P
AIN2N
+
Phase Shift &
Digital Filter
Gain & Offset
Calibration
Clock
Generation
œ
CLKIN
AGND
DGND
Simplified Block Diagram
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
Product Folder Links: ADS131M03
Copyright © 2021 Texas Instruments Incorporated
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