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Texas Instruments ADS127L21IRUKT
- Part No.:
- ADS127L21IRUKT
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
ADS127L21IRUKT.pdf
- Description:
- 24-BIT 512-KSPS WIDE-BANDWIDTH
- Quantity:
- Payment:
- Shipping:
Inventory:3,307
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Product details
Overview
ADS127L21IRUKT from Texas Instruments is a 24-bit, wideband delta-sigma analog-to-digital converter with programmable FIR/IIR digital filtering, 512kSPS wideband or 1.365MSPS low-latency operation, 111.5dB dynamic range at 200kSPS, ±0.4ppm FSR INL, and 3µs conversion latency in low-latency mode-used in high-precision vibration monitoring and Doppler ultrasound signal chains.
For engineers reviewing the ADS127L21IRUKT datasheet, ADS127L21IRUKT pinout, ADS127L21IRUKT application, or ADS127L21IRUKT equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated 20-pin WQFN package mapping, functional safety–capable architecture details, and two confirmed alternative ADCs with documented differences in filter flexibility and speed-power trade-offs.
Technical Context
The ADS127L21IRUKT integrates a low-drift delta-sigma modulator with dual-path digital filtering: a configurable 128-tap FIR + four-biquad IIR engine supporting A-weighting and notch filters, plus selectable wideband (sinc4/FIR) or low-latency (sinc1) modes. Its power-scalable architecture offers four discrete speed modes (50–512kSPS), each with defined AVDD1/IOVDD voltage ranges and corresponding current consumption.
It features buffered analog inputs and reference inputs, internal/external clock support, daisy-chain SPI with CRC validation, and a VCM output referenced to (AVDD1 + AVSS)/2. The device operates across –40°C to +125°C and includes functional safety documentation for system-level ISO 26262 or IEC 61508 compliance efforts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit-guarantees ≥144dB theoretical SNR headroom for ultra-low-noise sensor digitization. |
| Max Data Rate | 512kSPS (wideband filter)-supports full-bandwidth acquisition of ultrasonic or vibration signals up to ~200kHz. |
| Low-Latency Mode | 1.365MSPS with 3µs latency-enables real-time closed-loop control or time-of-flight measurements. |
| Dynamic Range | 111.5dB at 200kSPS-achieves >18.5 effective bits for high-fidelity DAQ in power quality analyzers. |
| INL Error | ±0.4ppm of FSR (typical)-ensures <1 LSB error over full scale at 24-bit resolution, critical for calibration-grade metrology. |
| Offset Drift | 50nV/°C-minimizes thermal-induced baseline shift in unattended industrial condition monitoring systems. |
| Power Consumption | 4.3mW at 50kSPS-enables battery-operated portable test equipment with >100-hour runtime. |
Pinout & Package
The ADS127L21IRUKT is housed in a 3mm × 3mm, 20-pin WQFN package (RUK) with exposed thermal pad connected to AVSS. Pin count, layout, and thermal metrics (RθJA = 58.3°C/W) are optimized for space-constrained, high-reliability PCBs in automotive and industrial environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AINP / AINN | Differential analog input | High-impedance buffered inputs accept ±VREF or ±2VREF ranges; precharge buffers reduce source loading for precision transducer interfacing. |
| REFP / REFN | Differential reference input | Accept 0.5–4.096V reference span; internal precharge buffer enables stable low-impedance reference drive without external op-amps. |
| AVDD1 / AVDD2 / AVSS | Analog supply rails | Split analog supplies isolate modulator (AVDD1/AVSS) and digital filter (AVDD2) domains to suppress supply noise coupling into conversion results. |
| IOVDD / DGND | Digital I/O supply & ground | 1.65–5.5V IOVDD supports direct interface to 1.8V/3.3V microcontrollers; separate DGND prevents digital switching noise from corrupting analog performance. |
| SCLK / SDI / SDO/DRDY / CS | SPI interface | Full-duplex SPI with daisy-chain capability and CRC validation ensures robust communication across isolation barriers in noisy factory automation systems. |
| START / RESET / CLK | Control & timing inputs | Asynchronous START initiates conversions; RESET provides hardware initialization; CLK accepts internal oscillator (25.6MHz) or external clock for precise timing control. |
| VCM | Common-mode voltage output | Provides (AVDD1 + AVSS)/2 reference for driving differential input stages-eliminates need for external bias network in fully differential front-ends. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable FIR + IIR filters | 128-tap FIR and four-biquad IIR allow custom A-weighting, anti-aliasing, or harmonic notch profiles-replacing external DSP in acoustic DAQ systems. |
| Wideband vs. low-latency filter modes | Selectable sinc4 (high DR) or sinc1 (low latency) paths enable one device to serve both high-fidelity analysis and real-time feedback control applications. |
| Power-scalable speed architecture | Four discrete speed modes (50/200/400/512kSPS) let designers trade resolution, bandwidth, and power per system requirements-no firmware rework needed. |
| Functional safety documentation | TI-provided FIT rate, failure mode analysis, and diagnostic coverage data accelerate ASIL-B or SIL-2 system certification without third-party validation overhead. |
| Buffered analog & reference inputs | Integrated input buffers eliminate external op-amps for strain gauge or RTD interfaces-reducing BOM cost, board area, and thermal drift sources. |
Applications
| Acoustic Data Acquisition | Vibration Condition Monitoring |
|---|---|
Use Scenario: Capturing broadband acoustic emissions from rotating machinery for early fault detection using portable handheld analyzers. IC Role / Device Role / Timing Role: Primary high-resolution ADC digitizing ±10V piezoelectric sensor outputs with 111.5dB DR and programmable A-weighting FIR filter. Use Value: Enables identification of sub-1dB amplitude changes in bearing defect frequencies without external signal conditioning hardware. |
Use Scenario: Real-time FFT-based spectral analysis of motor housing acceleration signals in predictive maintenance gateways. IC Role / Device Role / Timing Role: Wideband ADC sampling at 512kSPS feeding FPGA-based spectral processing; low-latency mode used for trigger event capture. Use Value: Delivers 24-bit fidelity up to 200kHz while maintaining deterministic 3µs latency for transient impact detection. |
| Doppler Ultrasound Imaging | Power Quality Analysis |
Use Scenario: Digitizing demodulated Doppler shift signals in portable ultrasound probes requiring low power and high SNR. IC Role / Device Role / Timing Role: Low-noise ADC operating in mid-speed mode (200kSPS, 14mW) with buffered inputs driving quadrature demodulator outputs. Use Value: Achieves –125dB THD and 112dB DR at 100kSPS-preserving weak blood flow harmonics amid strong carrier leakage. |
Use Scenario: Simultaneous voltage/current sampling in Class-A power analyzers measuring harmonics up to 50th order (2.5kHz @ 50Hz). IC Role / Device Role / Timing Role: Dual-channel synchronized ADC (with companion device) capturing 50/60Hz fundamentals and 3kHz+ harmonics with <0.4ppm INL linearity. Use Value: Meets IEC 61000-4-30 Ed.3 Class A accuracy requirements for RMS, THD, and flicker without post-calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS131M04IPBSR | 4-channel, 24-bit, fixed sinc3 filter; max 64kSPS per channel; no programmable FIR/IIR; lower power (12mW at 64kSPS) | Better suited for multi-channel, lower-bandwidth energy metering where filter customization is unnecessary | Select when channel count >1 and wideband filtering is not required-reduces firmware complexity and layout area. |
| AD7768-1ACPZ | Single-channel, 24-bit, 128kSPS max; programmable FIR but no IIR; higher THD (–115dB typ); requires external reference | Preferred for medical EEG/ECG where ultra-low THD at lower speeds suffices and external reference control is desired | Choose when system already uses precision external reference and needs guaranteed –115dB THD at ≤128kSPS-avoids internal reference calibration overhead. |
Compared with ADS131M04IPBSR and AD7768-1ACPZ, the ADS127L21IRUKT uniquely combines single-channel 512kSPS wideband operation, user-programmable FIR+IIR filtering, and integrated buffered reference-making it the only option among the three capable of replacing external DSP in high-frequency acoustic or ultrasonic signal chains without sacrificing dc precision.
Availability
ADS127L21IRUKT is available at Aetrix Electronics and suitable for test and measurement DAQ systems, industrial vibration monitors, Doppler ultrasound front-ends, and grid power quality analyzers requiring stable component supply across extended temperature and long production lifecycles.
Supply support for ADS127L21IRUKT 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 converters and industrial signal chain solutions.
The ADS127L21IRUKT belongs to TI's high-performance delta-sigma ADC portfolio designed for applications demanding simultaneous ac fidelity and dc accuracy-particularly where programmable digital filtering replaces external DSP in space- and power-constrained systems.
FAQ
What is the maximum achievable data rate of the ADS127L21IRUKT in low-latency filter mode?
The ADS127L21IRUKT achieves a maximum data rate of 1.365MSPS in low-latency filter mode, with a fixed conversion latency of 3µs. This mode uses a sinc1 decimation filter and is validated at 32.768MHz master clock frequency in max-speed mode. The ADS127L21IRUKT maintains full 24-bit resolution and <1ppm gain drift across this operating point, making it suitable for time-critical control loops and transient capture applications.
Does the ADS127L21IRUKT support daisy-chained SPI communication?
Yes, the ADS127L21IRUKT supports daisy-chained SPI configuration via its SDO/DRDY pin, allowing multiple devices to share a single SPI bus with minimal GPIO usage. The ADS127L21IRUKT implements CRC validation on both SPI input data and register readbacks, ensuring bit-level integrity in electrically noisy industrial environments-critical for reliable operation in factory automation systems.
What reference voltage ranges does the ADS127L21IRUKT accept?
The ADS127L21IRUKT accepts differential reference voltages from 0.5V to 4.096V, covering both low-range (0.5–2.75V) and high-range (1–4.096V) configurations. It supports input ranges of ±VREF or ±2VREF, and includes a reference precharge buffer that reduces required drive strength-enabling direct connection to precision voltage references like the REF6041 without external buffering.
How does the power-scalable architecture of the ADS127L21IRUKT work across speed modes?
The ADS127L21IRUKT defines four discrete speed modes-low (50kSPS), mid (200kSPS), high (400kSPS), and max (512kSPS)-each with specified AVDD1, AVDD2, and IOVDD voltage ranges and corresponding current draw. For example, at 50kSPS the ADS127L21IRUKT consumes just 4.3mW, while at 512kSPS it draws 33mW (typical). This allows designers to lock performance/power points without runtime reconfiguration overhead.
Is the ADS127L21IRUKT qualified for automotive or industrial temperature ranges?
Yes, the ADS127L21IRUKT is fully specified for operation from –40°C to +125°C ambient temperature and qualified per JEDEC JESD22 standards for thermal cycling, humidity, and solderability. Its 3mm × 3mm WQFN package with exposed thermal pad ensures reliable thermal performance in under-hood automotive sensors or sealed industrial enclosures-validated by TI's RθJA = 58.3°C/W rating.
ADS127L21IRUKT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 1.365M
- Number of Inputs:
- 1, 2
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- ADC
- Ratio - S/H:ADC:
- 0:1
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.85V ~ 5.5V
- Voltage - Supply, Digital:
- 1.65V ~ 5.5V
- Features:
- Internal Oscillator, Programmable Filter
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Supplier Device Package:
- 20-WQFN (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS127L21IRUKT FAQ
1.How can I place an order for ADS127L21IRUKT through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS127L21IRUKT 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 ADS127L21IRUKT reliable?
The price and inventory of ADS127L21IRUKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS127L21IRUKT is usually 5 days.
3.What payment methods are accepted for ADS127L21IRUKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS127L21IRUKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS127L21IRUKT?
ADS127L21IRUKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS127L21IRUKT 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 ADS127L21IRUKT?
For technical support, including ADS127L21IRUKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS127L21IRUKT requirements.
6.How does Aetrix verify that ADS127L21IRUKT is sourced from the original manufacturer or authorized distributors?
All ADS127L21IRUKT 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 ADS127L21IRUKT meets industry standards.
7.What is the process for return or replacement of ADS127L21IRUKT?
All ADS127L21IRUKT units undergo pre-shipment inspection (PSI). If there is an issue with ADS127L21IRUKT, 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 ADS127L21IRUKT part is unused and in its original packaging.
Return procedure for ADS127L21IRUKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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