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Texas Instruments ADS1131ID
- Part No.:
- ADS1131ID
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADS1131ID.pdf
- Description:
- IC ADC 18BIT SIGMA-DELTA 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:206
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Product details
Overview
ADS1131ID from Texas Instruments is a precision 18-bit delta-sigma analog-to-digital converter optimized for bridge sensor front-ends, featuring an integrated low-noise PGA with gain of 64, internal oscillator, and low-side power switch. It delivers 18-bit noise-free resolution at 10SPS (with simultaneous 50Hz/60Hz rejection) or 80SPS, operates from 3V to 5.3V, and is housed in an SOIC-16 package for weigh scale and load cell applications.
For engineers reviewing the ADS1131ID datasheet, ADS1131ID pinout, ADS1131ID application, or ADS1131ID equivalent, key selection considerations include its ratiometric bridge interface capability, pin-driven control architecture (no register programming), dual data-rate flexibility, and built-in 720Hz input anti-aliasing filter via external CAP pins.
Technical Context
The ADS1131ID employs a third-order ΔΣ modulator paired with a fourth-order sinc⁴ digital filter, enabling simultaneous 50Hz and 60Hz line-frequency rejection at 10SPS. Its internal chopper-stabilized amplifier uses matched resistors and EMI filtering (20MHz cutoff) to achieve ±15nV/°C offset drift and 110dB common-mode rejection at DC.
Control is fully pin-driven: SPEED selects data rate (10SPS or 80SPS), PDWN initiates full power-down, SCLK clocks out 18-bit two's complement data MSB-first on DRDY/DOUT, and SW provides low-side bridge power switching with 3.5Ω typical on-resistance at 5V AVDD.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit noise-free; guarantees no missing codes for high-precision bridge measurements |
| Data Rate | Selectable 10SPS (full 50/60Hz rejection) or 80SPS (higher throughput); set by SPEED pin logic level |
| Input Range | ±39mV differential full-scale at AVDD = 5V; supports direct connection to unamplified bridge outputs |
| PGA Gain | Fixed 64×; eliminates need for external instrumentation amplifier in most strain gauge designs |
| Reference Input | Ratiometric support up to 5V; VREFP–VREFN accepts 1.5V to AVDD+0.1V for flexible bridge excitation scaling |
| Power Supply | Separate AVDD (3–5.3V) and DVDD (2.7–5.3V); enables isolated analog/digital domains |
| Operating Temp | –40°C to +85°C; qualified for industrial weighing and process control environments |
Pinout & Package
ADS1131ID is packaged in a 16-pin SOIC (D package) with exposed pad thermal performance (θJA = 133.8°C/W). Pin assignments are validated per TI SBAS449C Rev C (October 2013).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DVDD | Digital supply | Provides power for digital logic and serial interface; independent from AVDD |
| GND (pins 2,3,11) | Common ground | Shared analog/digital reference plane; three dedicated pins minimize ground bounce |
| SPEED | Mode control input | Logic-low = 10SPS (50/60Hz rejection); logic-high = 80SPS (higher speed) |
| CAP (pins 5,6) | PGA bypass node | Connects external 0.1μF capacitor to form 720Hz anti-aliasing filter with internal RINT |
| AINP / AINN | Differential analog input | Accepts ±39mV full-scale bridge output; internal EMI filter suppresses RF interference |
| VREFP / VREFN | Reference inputs | Define ADC reference voltage; VREFN tied to bridge ground enables true ratiometric operation |
| SW | Bridge power switch | Low-side NMOS switch (RON ≈ 3.5Ω @ 5V) disconnects bridge during standby to eliminate power loss |
| AVDD | Analog supply | Supplies analog front-end and modulator; separate from DVDD for noise isolation |
| PDWN | Power-down control | Holding low resets ADC and reduces total current to 0.1μA (analog) + 0.2μA (digital) |
| SCLK | Serial clock input | Drives data retrieval timing; rising edge clocks out 18-bit conversion result MSB-first |
| DRDY/DOUT | Combined status/data | Active-low DRDY indicates valid data; transitions to DOUT mode on first SCLK rising edge |
Key Features
| Feature | Design Value |
|---|---|
| Complete bridge sensor front-end | Integrates PGA, ΔΣ ADC, oscillator, and SW switch-eliminates 4–6 discrete components in weigh scale BOM |
| Pin-driven configuration | No SPI/I²C registers to program; SPEED, PDWN, and SCLK directly control all modes and data flow |
| Simultaneous 50Hz/60Hz rejection | Enabled at 10SPS via sinc⁴ filter zeros aligned to both line frequencies-critical for global industrial deployments |
| Low-power standby mode | Reduces current to 45–65μA (DVDD-dependent) while retaining fast wake-up (<402ms) without reinitialization |
| Two-wire isolated interface | DRDY/DOUT + SCLK require only two optocoupler channels-simplifies isolation in safety-critical systems |
Applications
| Weigh Scales | Strain Gauges |
|---|---|
Use Scenario: Platform-based retail or industrial weighing systems requiring sub-gram resolution under varying AC line conditions. IC Role / Device Role / Timing Role: Primary ADC capturing mV-level Wheatstone bridge output from load cells; performs ratiometric conversion referenced to bridge excitation voltage. Use Value: Simultaneous 50Hz/60Hz rejection ensures stable readings in Europe and North America without firmware recalibration or hardware changes. | Use Scenario: Structural health monitoring sensors embedded in bridges or buildings measuring microstrain under thermal and mechanical stress. IC Role / Device Role / Timing Role: High-resolution digitizer for low-output strain gauges; uses internal 64× gain to resolve <1μV signals without external amplification. Use Value: 18-bit noise-free resolution and ±15nV/°C offset drift enable detection of sub-10ppm strain changes across –40°C to +85°C operating range. |
| Load Cells | Industrial Process Control |
Use Scenario: Factory automation hopper or tank weighing where bridge sensors operate in electrically noisy motor-drive environments. IC Role / Device Role / Timing Role: Front-end signal conditioner and ADC; SW pin controls bridge power to eliminate zero-drift during idle periods. Use Value: Low-side power switch (3.5Ω @ 5V) cuts bridge current to zero in standby, preventing thermal self-heating errors and extending sensor life. | Use Scenario: Closed-loop pressure or force feedback in hydraulic/pneumatic control valves requiring stable analog sensing over long service life. IC Role / Device Role / Timing Role: Precision measurement subsystem; uses internal oscillator to avoid external crystal cost and layout complexity. Use Value: Internal 76.8kHz modulator clock eliminates crystal aging, temperature drift, and PCB space-reducing calibration burden and field failure risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bridge-sensor ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1231ID | 24-bit resolution, same SOIC-16 package, identical pinout; requires external reference; no internal oscillator | Better resolution for ultra-high-precision lab equipment; lacks integrated clock and SW switch | Choose ADS1231ID when >18-bit resolution is mandatory and external crystal/reference is acceptable |
| AD7793BRUZ | 24-bit ΣΔ ADC, SPI interface, programmable gain (1–128), external clock required, TSSOP-24 package | Flexible gain and communication protocol for multi-sensor systems; higher pin count and software overhead | Choose AD7793BRUZ when system requires configurable gain, multiple channel scanning, or SPI integration |
Compared with ADS1231ID and AD7793BRUZ, the ADS1131ID offers lowest BOM cost and fastest time-to-market for dedicated bridge sensor applications due to its complete front-end integration, pin-driven simplicity, and SOIC-16 footprint-without sacrificing 18-bit noise-free performance or industrial temperature rating.
Availability
ADS1131ID is available at Aetrix Electronics and suitable for weigh scales, load cells, and industrial process control systems requiring stable component supply, long-lifecycle support, and guaranteed SOIC-16 packaging consistency.
Supply support for ADS1131ID 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 sensor interface solutions.
The ADS1131ID belongs to TI's precision delta-sigma ADC product line, designed specifically to simplify high-accuracy bridge sensor measurement in cost-sensitive industrial and consumer weighing applications-replacing multi-component front-ends with a single IC.
FAQ
What is the maximum full-scale input voltage supported by the ADS1131ID?
The ADS1131ID supports a differential full-scale input voltage of ±39mV when AVDD = 5V and ±23.4mV when AVDD = 3V. This range is fixed by the internal PGA gain of 64 and reference voltage scaling; exceeding it causes digital clipping at output codes 1FFFFh (positive) or 20000h (negative). The input stage includes ESD diodes clamping to AVDD and GND to protect against overvoltage transients.
How does the ADS1131ID achieve simultaneous 50Hz and 60Hz line-frequency rejection?
The ADS1131ID achieves simultaneous 50Hz and 60Hz rejection using its fourth-order sinc⁴ digital filter synchronized to a stable internal 76.8kHz modulator clock. At the 10SPS data rate, the filter's notch frequencies align precisely at both 50Hz and 60Hz, delivering ≥90dB normal-mode rejection without external filtering or firmware intervention-verified in TI SBAS449C electrical characteristics tables.
Can the ADS1131ID operate with an external voltage reference?
Yes, the ADS1131ID supports external voltage references up to 5V applied differentially between VREFP and VREFN pins. This enables true ratiometric measurements where the reference tracks bridge excitation voltage, canceling supply and resistor tolerance errors. The reference input impedance is high (>1GΩ typical), and input current is ≤10nA, minimizing loading effects on precision reference circuits.
What is the function of the CAP pins on the ADS1131ID?
The CAP pins (5 and 6) connect to an external 0.1μF capacitor that forms a 720Hz low-pass filter with the ADS1131ID's internal resistor RINT. This filter serves two critical roles: bandlimiting the analog input to prevent aliasing by the ΔΣ modulator, and attenuating chopper-stabilization residue to improve temperature drift performance. NPO or C0G ceramic capacitors placed close to the CAP pins are recommended for optimal stability.
Does the ADS1131ID require an external crystal or clock source?
No, the ADS1131ID does not require an external crystal or clock source. It incorporates a fully integrated, factory-trimmed oscillator that drives the 76.8kHz modulator clock. This eliminates external timing components, reduces PCB area and BOM cost, and avoids crystal aging or temperature drift issues-making the ADS1131ID ideal for compact, maintenance-free weighing systems where long-term calibration stability is essential.
ADS1131ID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 18
- Sampling Rate (Per Second):
- 80
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI
- Configuration:
- ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 3V ~ 5.3V
- Voltage - Supply, Digital:
- 3V ~ 5.3V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS1131ID FAQ
1.How can I place an order for ADS1131ID through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1131ID 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 ADS1131ID reliable?
The price and inventory of ADS1131ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1131ID is usually 5 days.
3.What payment methods are accepted for ADS1131ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1131ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1131ID?
ADS1131ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1131ID 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 ADS1131ID?
For technical support, including ADS1131ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1131ID requirements.
6.How does Aetrix verify that ADS1131ID is sourced from the original manufacturer or authorized distributors?
All ADS1131ID 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 ADS1131ID meets industry standards.
7.What is the process for return or replacement of ADS1131ID?
All ADS1131ID units undergo pre-shipment inspection (PSI). If there is an issue with ADS1131ID, 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 ADS1131ID part is unused and in its original packaging.
Return procedure for ADS1131ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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