ADS1131ID - 18-Bit Delta-Sigma ADC | Texas Instruments
MPN: ADS1131ID ✓ فعالADS1131ID نمای کلی
An analog-to-digital converter converts an analog input voltage into a numeric value for processing by a microcontroller or other digital controller. The ADS1131ID belongs to the delta-sigma ADC family and combines an analog signal-conditioning path with a precision 18-bit conversion stage. Its integrated bridge-switch feature is particularly useful in weighing systems because it can control the excitation current applied to a Wheatstone bridge while keeping the analog measurement path close to the sensor.
The principal device characteristics include 18-bit resolution, an 80-SPS conversion rate, one analog input, and a single-ended or differential input architecture. The internal amplifier provides a gain of 64, reducing the need for external analog gain stages in typical bridge-sensor circuits. An internal oscillator reduces dependence on an external clock source, while dedicated configuration pins simplify control because the device has no digital registers to program.
The converter outputs data through a serial interface suitable for connection to an MSP430 or another microcontroller. Dedicated pins control conversion timing and operating states, allowing the host processor to request data without writing a lengthy register sequence. This pin-programmed architecture can reduce firmware complexity and make the measurement interface easier to isolate on a mixed-signal printed circuit board.
Typical applications include resistive weigh scales, industrial load cells, pressure transmitters, and other bridge-based measurement systems. The combination of an integrated bridge power switch, low-noise amplifier, internal oscillator, and 18-bit conversion result supports compact sensor modules where component count and PCB area are important. The device can also form the analog front end of portable weighing equipment when low power consumption and deterministic control are priorities.
When designing the analog front end, verify the bridge excitation requirements, sensor input range, gain, conversion timing, and digital-interface voltage levels against the manufacturer datasheet. Pay particular attention to the power-switch configuration, analog input filtering, grounding, and the relationship between the bridge output and the converter input range. The 16-SOIC footprint requires adequate copper around thermal and return paths even though the principal measurement accuracy depends more heavily on the bridge, reference strategy, layout, and calibration than on package size.
This product page combines the manufacturer's device description with practical application guidance, sourcing information, and a parameter-by-parameter comparison framework. It also identifies the uncertainty that remains when a complete public pin description, verified alternative list, and explicit quantity-break price are unavailable, allowing engineers to focus on the validated ADS1131ID function, resolution, conversion rate, package, and bridge-sensor role.
جایگزین‌های drop-in برای ADS1131ID — همان پکیج، سازگار پین‌به‌پین. قطعات با پکیج متفاوت که نیاز به تغییر PCB دارند مستثنی هستند.
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درخواست جایگزینADS1131ID حداکثر مقادیر مجاز و مشخصات الکتریکی
| رزولوشن | 18 bit |
| Conversion Rate | 80 samples/s |
| Number of Analog Inputs | 1 input |
| ADC Architecture | Delta-sigma ADC |
| Input Type | Single-ended or differential |
| Integrated Amplifier Gain | 64 |
| Integrated Oscillator | Yes |
| Bridge Power Switch | Low-side power switch |
| Digital Interface | Serial |
| Register Programmable | No; controlled by dedicated pins |
| بسته‌بندی | 16-SOIC |
| تعداد پایه | 16 pins |
| محدوده دمای کاری | -40°C to +85°C |
| نوع نصب | Surface mount |
راهنمای پیکربندی پین ADS1131ID 16-soic
پیکربندی پین برای ADS1131ID (پکیج 16-soic). این قطعه آنالوگ دارای پین‌های ورودی، خروجی و تغذیه است. برای پیکربندی‌های پین offset null، جبران‌سازی و فعال‌سازی به دیتاشیت سازنده مراجعه کنید. ایده‌آل برای مدارهای شرطی‌سازی سیگنال و تقویت‌کننده.
داده پین‌آوت تفصیلی موجود نیست برای ADS1131ID.
به دیتاشیت برای پیکربندی کامل پین‌ها.
کاربردهای معمول
ADS1131ID مناسب است برای 6 کاربردs: Digital Weigh Scales, Industrial Load Cell Measurement, Pressure Transmitter Front Ends, Portable Weighing Instruments, Force and Torque Measurement, Precision Bridge Sensor Modules.
Digital Weigh Scales
The ADS1131ID fits digital weigh scales that use a load cell or other Wheatstone bridge because it combines an 18-bit delta-sigma ADC, a 64-gain low-noise amplifier, an internal oscillator, and a low-side bridge power switch in one 16-SOIC device. At 80 samples per second, the conversion rate is appropriate for weight readings that change more slowly than high-speed motion signals. Integrating these functions reduces the external analog chain required around the bridge. The bridge excitation, sensor sensitivity, and analog input range must still be matched so that full-scale output remains within the converter's operating limits, while PCB grounding and filtering should preserve the low-level differential signal.
Industrial Load Cell Measurement
Industrial load-cell systems can use the ADS1131ID to convert small differential bridge voltages into 18-bit digital measurements. Its internal amplifier gain of 64 increases the bridge signal before conversion, while the 80-SPS rate supports stable readings from force platforms, hopper scales, and process equipment. The low-side power switch provides a dedicated bridge-control function, and the internal oscillator avoids an external timing component. For reliable results, keep the bridge return and converter ground planes together, use a quiet analog supply, and account for sensor excitation drift and temperature effects during calibration. The result is a compact analog front end suitable for isolated or embedded weighing controllers.
Pressure Transmitter Front Ends
The ADS1131ID is appropriate for bridge-based pressure transmitters where the sensing element changes resistance or produces a small differential output. The 18-bit resolution preserves fine measurement detail, the integrated gain of 64 reduces analog front-end complexity, and the 80-SPS conversion rate suits slowly changing pressure variables. Its dedicated-pin control arrangement can simplify operation with a microcontroller or embedded controller because no digital registers must be programmed. A practical implementation should verify excitation voltage, common-mode range, input polarity, and filter selection. Stable reference behavior and careful bridge excitation are especially important because sensor drift and power variation can otherwise dominate the overall measurement error.
Portable Weighing Instruments
Portable scales benefit from the ADS1131ID because the 16-SOIC package integrates several bridge-sensor functions that might otherwise require separate analog components. The 18-bit conversion result supports high-resolution weight display and calibration algorithms, while the 80-SPS rate provides responsive readings without demanding the speed of a general-purpose waveform converter. The internal oscillator and dedicated serial interface help keep the surrounding microcontroller design straightforward. In battery-operated products, verify the complete analog and digital power-consumption profile under the intended conversion and powerdown states. Sensor warm-up, excitation drift, and mechanical vibration should also be included in the system error budget because they affect the final displayed weight independently of ADC resolution.
Force and Torque Measurement
Force tables, robotic test equipment, and torque-monitoring systems can use the ADS1131ID to digitize a bridge sensor's differential output. Its 18-bit resolution is useful when small force changes must remain distinguishable over a limited measurement range, and the integrated 64-gain amplifier helps bring the bridge signal into the converter's usable input range. An 80-SPS update rate is suitable for quasi-static force and torque feedback rather than impact or vibration analysis. The converter should be paired with a mechanically stable sensor, controlled excitation, and calibrated scale factor. Pay attention to input filtering and the relationship between the filter time constant and the 80-SPS data rate so that useful dynamic response is not unintentionally removed.
Precision Bridge Sensor Modules
The ADS1131ID is suited to compact bridge-sensor modules that need accurate conversion without a discrete analog front end. Integrating the amplifier, oscillator, converter, and bridge power switch into a 16-SOIC package supports board-space reduction while preserving an 18-bit measurement result. The dedicated serial interface can be routed to a low-power microcontroller, and the controlled-pin architecture avoids a register-programming task. Module designers should calculate the available bridge excitation and verify that the sensor's nominal sensitivity places the differential signal within the converter's linear input range. Calibration storage, connector protection, and thermal compensation are separate system requirements and should not be inferred from the ADC's nominal resolution.
داده‌های مرجع مهندسی برای ADS1131ID — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول |
|---|---|
| Package | 16-SOIC |
| Brand | Texas Instruments |
| Resolution | 18 bit |
| Conversion Rate | 80 samples/s |
| Number of Analog Inputs | 1 input |
| Integrated Amplifier Gain | 64 |
| Input Configuration | Single-ended or differential |
| Bridge Power Switch | Low-side power switch |
| Oscillator | Internal |
| Operating Temperature Range | -40°C to +85°C |
تفاوت‌های کلیدی
- Complete bridge-sensor conversion front end (در مقابلGeneric 18-bit delta-sigma ADC)
- Pin-programmed interface (در مقابلRegister-programmable 18-bit ADC)
- Measurement-oriented conversion rate (در مقابلGeneric high-speed delta-sigma ADC)
یادداشت‌های طراحی
Route the bridge inputs as a compact, balanced differential pair and connect the converter ground to the measurement-system ground without sharing high-current return paths. Place input filtering and protection components close to the ADS1131ID pins, while keeping their ground connections short. Verify that the bridge excitation return and analog return meet the sensor manufacturer's grounding guidance; incorrect grounding can create an offset larger than the useful resolution of the converter.
Select the input filter time constant in relation to the 80-SPS conversion rate rather than treating the 18-bit resolution as usable before settling. For a weighing or slow force-measurement system, a settled response is usually more valuable than rapid settling. The device's internal oscillator supports standalone operation, but the entire signal path still requires evaluation for bridge capacitance, cable length, shielding, and common-mode variation before calibration data are trusted.
Do not assume that a related 16-SOIC ADC is automatically interchangeable. Verify every pin function, supply range, analog input range, conversion timing, bridge-switch connection, and serial-interface signal against the manufacturer pin descriptions. The ADS1131ID uses dedicated control pins rather than a register map, so substituting a configurable ADC can change both firmware and the PCB interface even if resolution and package dimensions appear similar.
اطلاعات انطباق
No explicit compliance declarations were identified in the available manufacturer and distributor references. The ADS1131 is an industrial 16-SOIC analog-to-digital converter; an automotive qualification designation is not stated.
