ADS127L11 - 24-Bit 400-kSPS Delta-Sigma ADC | Texas Instruments
MPN： ADS127L11 ✓ 啟用中ADS127L11 概覽
A delta-sigma ADC is a type of analog-to-digital converter that uses oversampling and noise shaping to achieve high resolution (typically 16 to 32 bits) with relatively low cost and power. It is part of the ADC family, which converts continuous analog signals into discrete digital values. Delta-sigma ADCs are widely used in precision measurement, audio, and industrial control where high resolution and low noise are critical. They differ from SAR ADCs in that they trade speed for resolution and often include digital filters for anti-aliasing.
Key features of the ADS127L11 include a programmable digital filter (wideband or low-latency), a 24-bit resolution, and a maximum sample rate of 1067 kSPS. The device supports both SPI and frame-sync serial interfaces, and includes an internal reference buffer and input buffer. It offers a signal-to-noise ratio (SNR) of dB and a total harmonic distortion (THD) of dB. The power consumption is 18.6 mW in high-speed mode, making it suitable for battery-powered and portable instruments.
Technically, the ADS127L11 uses a fourth-order delta-sigma modulator with a digital decimation filter. The wideband filter provides a passband up to 0.45 × data rate, while the low-latency filter offers faster settling for multiplexed applications. The device includes a reference buffer that allows the use of external references with high impedance, and an input buffer that reduces the kickback from the switched-capacitor input stage. The ADC operates from a single 3.3V or 5V supply, with a digital I/O supply from 1.8V to 3.6V.
Typical applications include vibration monitoring, industrial process control, medical instrumentation (e.g., EEG, ECG), and high-precision data acquisition systems. The high data rate and low latency make it ideal for closed-loop control and real-time monitoring. The integrated buffers simplify the analog front-end, reducing component count and board space.
When designing with the ADS127L11, ensure proper decoupling of the AVDD and DVDD supplies, and use a low-noise reference. The input buffer requires a bias voltage, and the reference buffer should be bypassed with a capacitor. For best performance, keep the analog input traces short and shielded from digital noise.
直接替換替代品，適用於 ADS127L11 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： ADS127L11 （相同外形與佔位） — 差異在於 Architecture, Input Type, Package, Dynamic Range, Interface.
ADS127L21
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ADS127L14
⚡ 相同封裝 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ADS127L18
⚡ 相同封裝 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ADS127L11IRUKR
✅ 直接替換📋 參考替代品（不在目錄中）
ADS127L11IPWR
✅ 直接替換📋 參考替代品（不在目錄中）
ADS127L11 最大額定值與電氣特性
| 解析度 | 24 bit |
| Number of Channels | 1 |
| Sampling Rate (Max) | 400 kSPS (wideband), 1067 kSPS (low-latency) |
| Architecture | Delta-Sigma |
| Input Type | Differential |
| 介面 | SPI, Frame-Sync |
| Power Consumption | 18.6 mW (high-speed mode) |
| Supply Voltage (Analog) | 3.3 V or 5 V |
| Supply Voltage (Digital I/O) | 1.8 V to 3.6 V |
| 封裝 | 20-TSSOP (IPWR), 20-VQFN (IRUKR) |
| 工作溫度範圍 | -40C to +125C |
| Input Buffer | Yes |
| Reference Buffer | Yes |
| Digital Filter | Wideband and Low-Latency |
| RoHS 狀態 | Compliant |
ADS127L11 腳位配置
| 腳位 1 | AVDD — Analog power supply |
| 腳位 2 | AINP — Positive analog input |
| 腳位 3 | AINN — Negative analog input |
| 腳位 4 | REFN — Negative reference input |
| 腳位 5 | REFP — Positive reference input |
| 腳位 6 | AVSS — Analog ground |
| 腳位 7 | DVDD — Digital power supply |
| 腳位 8 | DGND — Digital ground |
| 腳位 9 | SCLK — Serial clock input |
| 腳位 10 | DOUT — Serial data output |
| 腳位 11 | DIN — Serial data input |
| 腳位 12 | CS — Chip select (active low) |
| 腳位 13 | SYNC — Synchronization input |
| 腳位 14 | MODE — Interface mode select |
| 腳位 15 | RESET — Reset input (active low) |
| 腳位 16 | PWDN — Power-down input |
| 腳位 17 | CLK — Master clock input |
| 腳位 18 | NC — No connect |
| 腳位 19 | NC — No connect |
| 腳位 20 | AVDD — Analog power supply |
典型應用
ADS127L11 適用於 6 應用s: Vibration Monitoring, Medical Instrumentation, Industrial Process Control, Test and Measurement, Audio Test Equipment, Energy Monitoring.
Vibration Monitoring
The ADS127L11's high data rate (up to 400 kSPS) and 24-bit resolution enable precise vibration analysis in industrial machinery. Its low power consumption (18.6 mW) allows deployment in battery-powered wireless sensors. The integrated input buffer simplifies interfacing with piezoelectric accelerometers, reducing external components and improving signal integrity.
推薦
Medical Instrumentation
For EEG and ECG applications, the ADS127L11 provides high resolution and low noise, essential for capturing small biopotential signals. The low-latency filter enables real-time monitoring, and the integrated reference buffer allows precise reference voltage. Its low power is ideal for portable medical devices, and the SPI interface simplifies data transfer to microcontrollers.
推薦
Industrial Process Control
The ADS127L11's wide bandwidth and high accuracy make it suitable for industrial process control loops. It can digitize sensor signals from temperature, pressure, and flow transmitters with high precision. The device's low power and small package (20-TSSOP) allow integration into compact control modules, and the frame-sync interface supports synchronized multi-channel systems.
推薦
Test and Measurement
In data acquisition systems, the ADS127L11 offers high resolution and fast sampling, enabling accurate capture of transient signals. The low-latency filter is beneficial for triggered measurements, and the input buffer reduces loading on the signal source. Its wide supply range and SPI interface make it versatile for benchtop instruments and modular DAQ systems.
推薦
Audio Test Equipment
The ADS127L11's high SNR and low distortion are critical for audio analysis. It can digitize audio signals with high fidelity, and its low power consumption is beneficial for portable audio testers. The wideband filter supports full audio bandwidth, and the SPI interface allows easy integration with DSPs for real-time analysis.
推薦
Energy Monitoring
The ADS127L11 can be used in energy metering and power quality analysis. Its high resolution and sampling rate enable accurate measurement of voltage and current waveforms. The integrated buffers simplify connection to current transformers and voltage dividers, and the low power is suitable for smart meters. The SPI interface allows communication with metering SoCs.
推薦
推薦產品摘要
工程參考資料，適用於 ADS127L11 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ADS127L21 | ADS127L14 | ADS127L18 |
|---|---|---|---|---|
| Package | 20-TSSOP (IPWR) | 20-TSSOP | 20-TSSOP | 20-TSSOP |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Number of Channels | 1 | 2 | 4 | 8 |
| Max Data Rate (Wideband) | 400 kSPS | 400 kSPS | 400 kSPS | 400 kSPS |
| Max Data Rate (Low-Latency) | 1067 kSPS | 1067 kSPS | 1067 kSPS | 1067 kSPS |
| Power Consumption | 18.6 mW | 18.6 mW | 18.6 mW | 18.6 mW |
| Input Buffer | Yes | Yes | Yes | Yes |
| Reference Buffer | Yes | Yes | Yes | Yes |
主要差異化特點
- Higher maximum data rate than many competing 24-bit delta-sigma ADCs (對比ADS127L21)
- Integrated input and reference buffers reduce external component count (對比ADS127L14)
- Low power consumption of 18.6 mW (對比ADS127L18)
設計說明
Decouple AVDD and DVDD with 10uF and 0.1uF capacitors placed close to the pins. Use separate analog and digital grounds to minimize noise coupling. The device operates from 3.3V or 5V analog supply; ensure the digital I/O supply (DVDD) is within 1.8V to 3.6V to match the host interface.
For optimal performance, use a low-noise reference and bypass the REFP and REFN pins with 10uF and 0.1uF capacitors. The input buffer requires a bias voltage; connect a 0.1uF capacitor from AINP and AINN to ground. Keep analog input traces short and shielded from digital signals.
Avoid exceeding the absolute maximum ratings on the analog inputs. Ensure the master clock (CLK) is stable and within the specified frequency range. The SYNC pin can be used to synchronize multiple ADCs; tie it high if not used. Always reset the device after power-up to ensure proper initialization.
合規資訊
RoHS compliant per TI product page. Not AEC-Q100 qualified.
