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Texas Instruments ADS131M03IPWR
- Part No.:
- ADS131M03IPWR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS131M03IPWR.pdf
- Description:
- IC ANALOG TO DIGITAL CONVERTER
- Quantity:
- Payment:
- Shipping:
Inventory:2,999
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Product details
Overview
ADS131M03IPWR from Texas Instruments is a 3-channel, simultaneously-sampling, 24-bit delta-sigma ADC with programmable gain up to 128, 102-dB dynamic range at 4 kSPS/gain=1, and integrated 1.2-V low-drift reference-designed for high-accuracy energy metering in commercial electricity meters and protection relays.
For engineers reviewing the ADS131M03IPWR datasheet, ADS131M03IPWR pinout, ADS131M03IPWR application, or ADS131M03IPWR equivalent, this device delivers channel-to-channel phase calibration (244-ns resolution), CRC-protected SPI interface, and current-detect mode for tamper detection-critical for IEC 62053-compliant metering systems requiring stable DC accuracy and low power at –40°C to +125°C.
Technical Context
The ADS131M03IPWR implements a multi-channel delta-sigma modulator architecture with independent PGA per channel (gain 1–128), digital filter with selectable oversampling ratio (OSR), and global-chop mode to reduce offset drift. Its integrated negative charge pump enables input signals below AGND, supporting direct connection to shunt resistors and current transformers.
It features three differential analog inputs (AIN0P/N, AIN1P/N, AIN2P/N), synchronous SPI interface (CPOL=0, CPHA=1), and dual supply operation (2.7–3.6 V AVDD/DVDD). Phase delay calibration, offset/gain registers, and CRC on register map and data transfers ensure signal-chain integrity in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit delta-sigma - delivers 113 dB dynamic range (16.5 ENOB) at 0.25 kSPS/gain=1 for precision metrology-grade measurements. |
| Data Rate | Up to 64 kSPS in high-resolution mode - supports real-time harmonic analysis up to 50th order at 50/60 Hz fundamental. |
| Input Impedance | ≥1 MΩ at gains ≥8 - enables direct high-impedance sensor interfacing without external buffering in voltage measurement paths. |
| Dynamic Range | 102 dB at gain=1, 4 kSPS - meets Class 0.2 accuracy requirements for active energy measurement per IEC 62053-22. |
| THD | –100 dB at 50/60 Hz - ensures clean spectral performance for power quality analysis including flicker and interharmonics. |
| Crosstalk | –120 dB between channels - preserves isolation during simultaneous sampling of voltage and current across multiple phases. |
| Power Consumption | 3.6 mW at 3 V, 4 kSPS - enables compact, thermally constrained designs in DIN-rail mounted circuit breakers and portable test equipment. |
Pinout & Package
ADS131M03IPWR is available in a 20-pin TSSOP (PW) package (6.50 mm × 4.40 mm) with exposed thermal pad connected to AGND. Pin functions are identical between TSSOP and WQFN variants per TI SBAS889A Rev A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0P / AIN0N AIN1P / AIN1N AIN2P / AIN2N |
Differential analog inputs (x3) | Accept ±1.3 V differential signals referenced to AGND; support direct shunt/CT interfacing with >1-MΩ impedance at gain ≥8. |
| AVDD, AGND DVDD, DGND |
Analog/digital supplies & grounds | Separate analog/digital domains minimize noise coupling; AVDD must be decoupled with 1-µF capacitor to AGND. |
| SCLK, DIN, DOUT, CS | SPI interface | Standard 4-wire SPI (CPOL=0, CPHA=1); DRDY indicates new conversion data ready for readout. |
| CLKIN | Master clock input | Accepts 0.3–8.192 MHz external clock; sets OSR and data rate-enables precise timing control for synchronized sampling. |
| SYNC/RESET | Conversion sync or reset | Active-low pulse synchronizes all three ADCs; also serves as hardware reset with 2048×CLKIN minimum pulse width. |
| CAP | Digital LDO output | Provides regulated 1.8 V for internal digital logic when DVDD is 2.7–3.6 V; requires 220-nF capacitor to DGND. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous sampling | Three independent delta-sigma modulators capture voltage/current on all phases at exact same instant-eliminates time-skew errors in polyphase energy calculation. |
| Programmable phase delay calibration | 244-ns resolution per channel allows fine-tuning of sampling alignment to compensate for sensor or PCB trace delays in multi-channel metering front-ends. |
| Integrated 1.2-V reference | Low-drift (7.5 ppm/°C typ) reference reduces BOM count and PCB area; eliminates need for external precision reference in Class 0.2 meter designs. |
| CRC on register map & data | Hardware CRC engine validates SPI reads/writes and conversion data-prevents undetected corruption in noisy industrial communication buses. |
| Current-detect mode | Ultra-low-power (0.78 µA analog current) tamper detection mode enables battery-backed anti-tampering circuits without compromising main measurement accuracy. |
Applications
| Electricity Meters | Protection Relays |
|---|---|
|
Use Scenario: Measuring active/reactive energy in 3-phase residential/commercial meters compliant with IEC 62053-21 and -22. IC Role / Device Role / Timing Role: Primary analog front-end ADC performing simultaneous voltage/current sampling across all phases with <100-ns inter-channel skew. Use Value: 102-dB dynamic range and –100 dB THD enable Class 0.2 accuracy over 1000:1 current range without auto-ranging hardware. |
Use Scenario: Real-time fault detection and trip decision logic in medium-voltage feeder protection relays. IC Role / Device Role / Timing Role: High-speed acquisition engine capturing transient overcurrent/overvoltage events with synchronized 3-channel sampling and fast startup (<0.5 ms). Use Value: 64-kSPS data rate and –120 dB crosstalk allow accurate RMS, harmonic, and sequence component calculation during asymmetrical faults. |
| Circuit Breakers | Battery Test Equipment |
|
Use Scenario: Embedded power monitoring in smart molded-case circuit breakers (MCCBs) with energy logging and thermal derating. IC Role / Device Role / Timing Role: Precision metrology core converting shunt-based current and bus voltage into calibrated digital values for firmware-based protection algorithms. Use Value: Integrated negative charge pump permits measurement of signals below ground-enabling bidirectional current sensing with single-supply operation. |
Use Scenario: High-resolution capacity and impedance testing of Li-ion cells and battery packs during production and R&D. IC Role / Device Role / Timing Role: Low-noise, low-drift ADC capturing millivolt-level voltage drops across sense resistors during charge/discharge cycles. Use Value: 0.2 µV offset drift and 300 nV/°C tempco ensure stable baseline accuracy over temperature and time-critical for mAh integration fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-channel, 24-bit delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS131M04IPWR | 4-channel version with identical specs except added AIN3P/N and extended register map; same pinout and footprint. | Supports 4-wire Wye or additional auxiliary measurement (e.g., neutral current); requires minor firmware update for extra channel handling. | Select when future-proofing for 4-channel systems or needing redundant measurement paths without layout change. |
| AD7606C-24BSTZ | SAR architecture (not delta-sigma); 8-channel, ±10 V input range; no integrated reference; higher power (145 mW). | Better suited for transient capture (1 MSPS) but lower dynamic range (105 dB max); lacks simultaneous sampling phase calibration. | Choose for mixed-signal systems requiring both high-speed event capture and precision DC metrology-requires external reference and signal conditioning. |
Compared with ADS131M04IPWR, ADS131M03IPWR saves cost and simplifies firmware by omitting unused channel resources; versus AD7606C-24BSTZ, it delivers superior noise performance and built-in metrology features at lower power, but trades off maximum sample rate for resolution stability.
Availability
ADS131M03IPWR is available at Aetrix Electronics and suitable for electricity meters, protection relays, and circuit breaker applications requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for ADS131M03IPWR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision data acquisition and energy measurement ICs.
The ADS131M03IPWR belongs to TI's ADS131M family of metrology-optimized delta-sigma ADCs-engineered specifically for high-accuracy, low-power, multi-channel energy monitoring in utility-grade and industrial power systems.
FAQ
What is the maximum data rate supported by ADS131M03IPWR?
The ADS131M03IPWR supports up to 64 kSPS in high-resolution mode with fCLKIN = 8.192 MHz. This rate is achieved using the highest OSR setting and applies to all three channels simultaneously. Lower power modes reduce maximum data rate to 32 kSPS (low-power) and 16 kSPS (very-low-power), scaling linearly with clock frequency.
Does ADS131M03IPWR require an external reference voltage?
No, ADS131M03IPWR integrates a low-drift 1.2-V internal reference with ±0.1% initial accuracy and 7.5 ppm/°C typical drift. This eliminates the need for external reference components in most energy metering designs, reducing BOM cost and PCB area while maintaining Class 0.2 compliance.
How does the current-detect mode function in ADS131M03IPWR?
ADS131M03IPWR's current-detect mode draws only 0.78 µA analog supply current and maintains basic ADC functionality for tamper detection. It disables high-precision blocks (e.g., PGA, digital filter) while retaining sufficient resolution to monitor small leakage currents-ideal for battery-backed anti-tamper circuits in revenue-grade meters.
Can ADS131M03IPWR interface directly with shunt resistors without external amplification?
Yes, ADS131M03IPWR supports direct shunt connection via its high-input-impedance PGAs: ≥1 MΩ at gains ≥8 and 330 kΩ at gains 1–4. With 128× gain and 1.2-V reference, it resolves 2.3 µV LSB-enabling sub-milliohm shunt measurement at 10-A full scale with >1000:1 dynamic range.
What package options are available for ADS131M03IPWR?
ADS131M03IPWR is offered exclusively in the 20-pin TSSOP (PW) package (6.50 mm × 4.40 mm) with exposed thermal pad. While the ADS131M03 family also includes a WQFN variant (RUK), the "IPWR" suffix specifically denotes the TSSOP packaging-verified in TI's SBAS889A datasheet orderable addendum.
ADS131M03IPWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 64k
- Number of Inputs:
- 3
- Input Type:
- Differential
- Data Interface:
- Serial, SPI
- Configuration:
- PGA-ADC
- Ratio - S/H:ADC:
- 0:3
- Number of A/D Converters:
- 3
- Architecture:
- Sigma-Delta
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- 2.4V ~ 3.6V
- Voltage - Supply, Digital:
- 1.65V ~ 3.6V
- Features:
- PGA, Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 20-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS131M03IPWR FAQ
1.How can I place an order for ADS131M03IPWR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS131M03IPWR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADS131M03IPWR reliable?
The price and inventory of ADS131M03IPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS131M03IPWR is usually 5 days.
3.What payment methods are accepted for ADS131M03IPWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS131M03IPWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS131M03IPWR?
ADS131M03IPWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS131M03IPWR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADS131M03IPWR?
For technical support, including ADS131M03IPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS131M03IPWR requirements.
6.How does Aetrix verify that ADS131M03IPWR is sourced from the original manufacturer or authorized distributors?
All ADS131M03IPWR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADS131M03IPWR meets industry standards.
7.What is the process for return or replacement of ADS131M03IPWR?
All ADS131M03IPWR units undergo pre-shipment inspection (PSI). If there is an issue with ADS131M03IPWR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADS131M03IPWR part is unused and in its original packaging.
Return procedure for ADS131M03IPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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