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Texas Instruments ADS1131IDR
- Part No.:
- ADS1131IDR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADS1131IDR.pdf
- Description:
- IC ADC 18BIT SIGMA-DELTA 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,507
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Product details
Overview
ADS1131IDR 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 (gain = 64), internal oscillator, and low-side power switch. It delivers 18-bit noise-free resolution at 10SPS with simultaneous 50Hz/60Hz rejection, operates from 3V to 5.3V, and supports ±39mV full-scale differential input - ideal for high-accuracy weigh scale systems.
For engineers reviewing the ADS1131IDR datasheet, ADS1131IDR pinout, ADS1131IDR application, or ADS1131IDR equivalent, key selection considerations include its pin-driven control architecture (no register programming), SOIC-16 package compatibility, ratiometric reference support up to 5V, dual data rates (10/80SPS), and integrated bridge power switching capability.
Technical Context
The ADS1131IDR employs a third-order ΔΣ modulator paired with a fourth-order sinc⁴ digital filter, enabling precise line-frequency rejection without external clocking. Its chopper-stabilized amplifier architecture achieves ±15nV/°C input offset drift and 110dB common-mode rejection at DC.
Control is implemented via dedicated pins: SPEED selects 10SPS (50/60Hz rejection) or 80SPS mode; PDWN enables full power-down; SCLK initiates data readout and standby entry; DRDY/DOUT serves as both data-ready flag and serial output. The internal low-side switch (SW pin) eliminates bridge power dissipation during idle states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit noise-free resolution with no missing codes - ensures monotonicity and high dynamic range in precision weighing. |
| Data Rate | Selectable 10SPS (full 50/60Hz rejection) or 80SPS - balances noise performance vs. throughput for industrial sensor sampling. |
| Input Range | ±39mV differential full-scale at AVDD = 5V - matches typical bridge sensor outputs without external gain scaling. |
| PGA Gain | Fixed 64× internal gain - simplifies signal chain by eliminating external instrumentation amplifier requirements. |
| Reference Support | External ratiometric reference up to 5V (VREFP–VREFN) - enables direct bridge excitation referencing for temperature-insensitive measurements. |
| Power Supply | 3V to 5.3V dual supply (AVDD/DVDD) - allows flexible integration with 3.3V or 5V microcontroller systems. |
| Operating Temp | –40°C to +85°C - qualified for industrial and commercial embedded environments including factory floor instrumentation. |
Pinout & Package
ADS1131IDR is housed in a 16-pin SOIC (D package) with 1.27mm pitch, RoHS-compliant NIPDAU lead finish, and MSL Level-2 moisture sensitivity rating. Thermal resistance θJA = 133.8°C/W supports operation in compact PCB layouts without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DVDD | Digital power supply | 3V–5.3V supply for digital logic and interface circuitry; decoupling required near pin. |
| GND (pins 2,3,11) | Common ground | Shared analog/digital reference plane; multiple pins reduce ground impedance and improve PSRR. |
| SPEED | Data rate select | Logic-level input: low = 10SPS (50/60Hz rejection), high = 80SPS - sets filter settling and conversion timing. |
| CAP (pins 5,6) | PGA bypass node | Connects external 0.1μF capacitor to form 720Hz anti-aliasing filter; placement critical for EMI immunity. |
| AINP / AINN | Differential analog input | Accepts ±39mV bridge output directly; internal EMI filtering and diode clamping protect against overvoltage transients. |
| VREFP / VREFN | Reference voltage inputs | Define ADC full-scale range; VREFN tied to bridge ground enables true ratiometric measurement. |
| SW | Low-side bridge switch | Controls return path to GND; closed during conversion, open in standby/power-down to eliminate bridge power loss. |
| AVDD | Analog power supply | 3V–5.3V supply for PGA, modulator, and reference circuitry; separate from DVDD to minimize digital noise coupling. |
| PDWN | Power-down control | Active-low pin: hold low to shut down entire ADC and reset internal state; wake-up time < 8μs. |
| SCLK | Serial clock input | Drives data readout on rising edge; also enters standby mode when held high after DRDY assertion. |
| DRDY/DOUT | Dual-function I/O | Open-drain output: goes low when data ready; then shifts out 18-bit MSB-first data on subsequent SCLK edges. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-driven configuration | No register programming required - simplifies firmware integration and eliminates SPI/I²C driver dependencies. |
| Integrated bridge power switch | SW pin controls low-side switch (RON ≤ 7Ω at 3V) - reduces system power consumption and thermal drift in battery-powered scales. |
| Chopper-stabilized PGA | Gain = 64 with ±15nV/°C offset drift - maintains accuracy across industrial temperature ranges without calibration. |
| sinc⁴ digital filter | Provides deep nulls at 10Hz harmonics - enables simultaneous 50Hz and 60Hz line interference rejection at 10SPS. |
| Two-wire serial interface | DRDY/DOUT + SCLK only - minimizes isolation component count and PCB routing complexity in safety-critical applications. |
Applications
| Weigh Scales | Strain Gauges |
|---|---|
Use Scenario: High-precision platform scales used in pharmaceutical dispensing and laboratory metrology. IC Role / Device Role / Timing Role: Primary ADC front-end converting mV-level Wheatstone bridge output from load cells into calibrated weight values. Use Value: 18-bit noise-free resolution and 50/60Hz rejection ensure stable readings in electrically noisy lab environments without external notch filters. | Use Scenario: Structural health monitoring of bridges and buildings using bonded foil strain gauges. IC Role / Device Role / Timing Role: Signal conditioner and digitizer for low-output, high-impedance strain gauge arrays in distributed sensing nodes. Use Value: Integrated PGA gain of 64 and ratiometric reference support enable direct connection to unamplified gauges while maintaining temperature stability. |
| Load Cells | Industrial Process Control |
Use Scenario: Tank level and fill-volume measurement in food/beverage processing lines. IC Role / Device Role / Timing Role: Bridge sensor interface for stainless-steel load cells operating in humid, washdown environments. Use Value: Low-side power switch (SW pin) eliminates continuous bridge excitation current, reducing self-heating error and extending cell lifetime. | Use Scenario: Closed-loop pressure control in pneumatic actuators using piezoresistive bridge sensors. IC Role / Device Role / Timing Role: High-accuracy analog input stage feeding real-time PID controllers in PLC I/O modules. Use Value: 10SPS/80SPS dual-rate capability allows adaptive sampling - slow rate for stability during setpoint hold, fast rate for transient response during correction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bridge sensor ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1231IDR | 24-bit resolution, same SOIC-16 package, identical pinout, but requires external clock or crystal; higher power (1.3mW vs. 5mW total at 5V). | Used where ultra-high resolution outweighs need for internal oscillator simplicity; less suitable for space-constrained designs requiring minimal BOM. | Select ADS1231IDR only if 24-bit resolution is mandatory and external clock sourcing is acceptable. |
| HX711 | 24-bit sigma-delta ADC with built-in PGA (gain 32/64/128), but no internal oscillator, no SW pin, and only 2-wire interface with non-standard timing; DFN-16 package. | Targeted at consumer-grade scales; lacks 50/60Hz rejection at fixed rates and industrial temp range (–40°C to +85°C). | Choose HX711 only for cost-sensitive, non-certified applications where ESD robustness and line-rejection are secondary. |
Compared with ADS1231IDR and HX711, the ADS1131IDR uniquely combines internal oscillator, integrated bridge switch, and guaranteed 50/60Hz rejection in a pin-compatible SOIC-16 footprint - making it optimal for certified industrial weighing systems requiring minimal external components and deterministic timing.
Availability
ADS1131IDR is available at Aetrix Electronics and suitable for weigh scales, strain gauge instrumentation, and industrial process control requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for medical and safety-critical deployments.
Supply support for ADS1131IDR 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 ADS1131IDR belongs to TI's precision delta-sigma ADC product line, engineered specifically for high-accuracy bridge sensor measurement in industrial weighing, structural monitoring, and process automation systems.
FAQ
What is the maximum recommended external reference voltage for ADS1131IDR?
The ADS1131IDR supports an external voltage reference up to 5V (VREFP – VREFN ≤ 5V), with valid operating range from 1.5V to AVDD. For ratiometric bridge measurements, tying VREFN to the bridge ground and VREFP to AVDD ensures inherent temperature and supply drift cancellation - a key design advantage of the ADS1131IDR in precision weighing applications.
Does ADS1131IDR require an external crystal or clock source?
No, the ADS1131IDR integrates a precision internal oscillator, eliminating the need for external crystals, capacitors, or clock generators. This simplifies layout, reduces BOM count, and improves reliability in vibration-prone environments - a core feature distinguishing the ADS1131IDR from alternatives like the ADS1231IDR that require external timing components.
How does the SW pin function in ADS1131IDR bridge sensor applications?
The SW pin on the ADS1131IDR controls an internal low-side power switch (RON ≤ 7Ω at 3V) that connects the bridge sensor return path to ground. During active conversion, SW is pulled low; in standby or power-down modes, SW becomes high-impedance - cutting off bridge excitation current and eliminating self-heating errors. This functionality is unique to the ADS1131IDR among TI's bridge ADC portfolio.
What is the noise performance of ADS1131IDR at 10SPS and 80SPS data rates?
At 10SPS, the ADS1131IDR achieves 300nV peak-to-peak noise (typical); at 80SPS, noise increases to 500nV peak-to-peak (typical), both measured with AVDD = VREF = 5V. This 1.7× noise increase reflects the trade-off between speed and resolution - a documented characteristic of the ADS1131IDR's sinc⁴ filter architecture that enables its simultaneous 50/60Hz rejection capability.
Can ADS1131IDR interface directly with MSP430 microcontrollers?
Yes, the ADS1131IDR's two-wire serial interface (DRDY/DOUT and SCLK) is explicitly designed for direct connection to MSP430x4xx and other low-power microcontrollers. Its open-drain DRDY/DOUT output, 5MHz max SCLK frequency, and pin-driven control eliminate protocol overhead - enabling seamless integration without additional level-shifting or interface ICs in MSP430-based ADS1131IDR systems.
ADS1131IDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- -
ADS1131IDR FAQ
1.How can I place an order for ADS1131IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1131IDR 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 ADS1131IDR reliable?
The price and inventory of ADS1131IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1131IDR is usually 5 days.
3.What payment methods are accepted for ADS1131IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1131IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1131IDR?
ADS1131IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1131IDR 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 ADS1131IDR?
For technical support, including ADS1131IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1131IDR requirements.
6.How does Aetrix verify that ADS1131IDR is sourced from the original manufacturer or authorized distributors?
All ADS1131IDR 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 ADS1131IDR meets industry standards.
7.What is the process for return or replacement of ADS1131IDR?
All ADS1131IDR units undergo pre-shipment inspection (PSI). If there is an issue with ADS1131IDR, 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 ADS1131IDR part is unused and in its original packaging.
Return procedure for ADS1131IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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