ADS131M08
SBAS950B – OCTOBER 2019 – REVISED FAEBDRSU1A3R1YM200281
SBAS950B – OCTOBER 2019 – REVISED FEBRUARY 2021
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ADS131M08 8-Channel, Simultaneously-Sampling, 24-Bit, Delta-Sigma ADC
1 Features
3 Description
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8 simultaneously sampling differential inputs
Programmable data rate up to 32 kSPS
Programmable gain up to 128
The ADS131M08 is a eight-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 or a Rogowski coil
to measure current.
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:
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– 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 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: 6.0 mW at 3-V AVDD
and DVDD
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.
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Device Information (1)
PART NUMBER
PACKAGE
TQFP (32)
WQFN (32)
BODY SIZE (NOM)
5.00 mm × 5.00 mm
4.00 mm × 4.00 mm
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Packages: 32-pin TQFP or 32-pin WQFN
Operating temperature range: –40°C to +125°C
ADS131M08
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
2 Applications
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Electricity meters: commercial and residential
Circuit breakers
Protection relays
Power quality meters
Battery test equipment
AVDD
REFIN
DVDD
SW
1.2-V
Reference
AIN0P
AIN0N
+
Phase Shift
Digital Filter
&
Gain
& Offset
Calibration
Channel
0
DS ADC
SYNC / RESET
œ
Channel
0
CS
SCLK
AINnP
AINnN
+
+
Phase Shift
Phase Shift
Phase Shift
&
Gain
Gain
Gain
Calibration
Gain
Calibration
Ga n & Offset
&
Offset
& Offset
& Offset
Control &
Serial Interface
&
Channels 1-6
DS ADC
DS ADC
DS ADC
DS ADC
+
DIN
&
Digital Filter
Phase Shift
Calibration
Gain Offset
+
&
&
& Offset
Battery management systems
œ
Digital Filter
Phase Shift
+
&
œ
Digital Filter
Phase Shift
DS ADC
+
&
Calibration
Calibration
Calibration
DOUT
DRDY
Digital Filter
Digital Filter
Digital Filter
œ
DS ADC
œ
œ
œ
Channels 1-6
AIN7P
AIN7N
+
Phase Shift
Digital Filter
&
Gain & Offset
Calibration
Channel
Channel
7
DS ADC
XTAL1
XTAL2
/ CLKIN
Clock
Generation
œ
7
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: ADS131M08
Copyright © 2021 Texas Instruments Incorporated
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