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ADS127L21

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24-bit, 512-kSPS wide-bandwidth delta-sigma ADC with programmable IIR and FIR filters

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Data sheet

ADS127L21

ACTIVE
Data sheet Order now

Product details

Resolution (Bits) 24 Sample rate (max) (ksps) 1365 Number of input channels 1 Interface type SPI Architecture Delta-Sigma Input type Differential, Single-ended Rating Catalog TI functional safety category Functional Safety-Capable Reference mode External Input voltage range (max) (V) 5 Input voltage range (min) (V) 0 Features Daisy-Chainable, Oscillator, Small Size, Wideband Operating temperature range (°C) -40 to 125 Analog supply voltage (min) (V) 2.85 Analog supply voltage (max) (V) 5.5 SNR (dB) 110 Digital supply (min) (V) 1.65 Digital supply (max) (V) 5.5
Resolution (Bits) 24 Sample rate (max) (ksps) 1365 Number of input channels 1 Interface type SPI Architecture Delta-Sigma Input type Differential, Single-ended Rating Catalog TI functional safety category Functional Safety-Capable Reference mode External Input voltage range (max) (V) 5 Input voltage range (min) (V) 0 Features Daisy-Chainable, Oscillator, Small Size, Wideband Operating temperature range (°C) -40 to 125 Analog supply voltage (min) (V) 2.85 Analog supply voltage (max) (V) 5.5 SNR (dB) 110 Digital supply (min) (V) 1.65 Digital supply (max) (V) 5.5
WQFN (RUK) 20 9 mm² (3 mm × 3 mm)
  • Programmable FIR filter
  • Programmable IIR filter
  • Wideband or low-latency filter modes
  • Programmable data rates:
    • Wideband filter: 512kSPS
    • Low-latency filter: 1.365MSPS
  • Conversion latency (low-latency filter): 3µs
  • AC accuracy with dc precision:
    • Dynamic range (200kSPS): 111.5dB (typical)
    • THD: –125dB (typical)
    • INL: 0.4ppm of FSR (typical)
    • Offset drift: 50nV/°C (typical)
    • Gain drift: 0.5ppm/°C (typical)
  • Power-scalable speed ranges:
    • Max speed: 512kSPS, 33mW (typical)
    • High speed: 400kSPS, 26mW (typical)
    • Mid speed: 200kSPS, 14mW (typical)
    • Low speed: 50kSPS, 4.3mW (typical)
  • Input range: ±VREF or ±2VREF
  • Buffered inputs
  • Internal or external clock operation
  • Functional Safety-Capable
  • Programmable FIR filter
  • Programmable IIR filter
  • Wideband or low-latency filter modes
  • Programmable data rates:
    • Wideband filter: 512kSPS
    • Low-latency filter: 1.365MSPS
  • Conversion latency (low-latency filter): 3µs
  • AC accuracy with dc precision:
    • Dynamic range (200kSPS): 111.5dB (typical)
    • THD: –125dB (typical)
    • INL: 0.4ppm of FSR (typical)
    • Offset drift: 50nV/°C (typical)
    • Gain drift: 0.5ppm/°C (typical)
  • Power-scalable speed ranges:
    • Max speed: 512kSPS, 33mW (typical)
    • High speed: 400kSPS, 26mW (typical)
    • Mid speed: 200kSPS, 14mW (typical)
    • Low speed: 50kSPS, 4.3mW (typical)
  • Input range: ±VREF or ±2VREF
  • Buffered inputs
  • Internal or external clock operation
  • Functional Safety-Capable

The ADS127L21 is a 24-bit, delta-sigma (ΔΣ), analog-to-digital converter (ADC) featuring programmable digital filters. This digital filter has data rates up to 512kSPS using the wideband filter and up to 1365kSPS using the low-latency filter. The device offers an excellent combination of ac performance and dc precision with low power consumption.

Programmable infinite and finite impulse response (IIR and FIR) digital filters allow custom filter profiles, such as A-weighting compensation and frequency notch filters. The wideband or low-latency filter option optimize ac-signal performance or data throughput of dc signals, all in one device.

The low-drift modulator achieves excellent dc precision with low wideband noise for outstanding ac performance. The power-scalable architecture features four speed modes to optimize data rate, resolution, and power consumption. Signal and reference input buffers reduce driver loading for increased accuracy.

The serial interface features daisy-chain capability to reduce the number of signal lines over an isolation barrier. SPI input data and register memory contents are validated by cyclic-redundancy check (CRC) to enhance operational reliability.

The small 3mm × 3mm WQFN package is designed for space-limited applications. The device is fully specified for operation over the –40°C to +125°C temperature range.

The ADS127L21 is a 24-bit, delta-sigma (ΔΣ), analog-to-digital converter (ADC) featuring programmable digital filters. This digital filter has data rates up to 512kSPS using the wideband filter and up to 1365kSPS using the low-latency filter. The device offers an excellent combination of ac performance and dc precision with low power consumption.

Programmable infinite and finite impulse response (IIR and FIR) digital filters allow custom filter profiles, such as A-weighting compensation and frequency notch filters. The wideband or low-latency filter option optimize ac-signal performance or data throughput of dc signals, all in one device.

The low-drift modulator achieves excellent dc precision with low wideband noise for outstanding ac performance. The power-scalable architecture features four speed modes to optimize data rate, resolution, and power consumption. Signal and reference input buffers reduce driver loading for increased accuracy.

The serial interface features daisy-chain capability to reduce the number of signal lines over an isolation barrier. SPI input data and register memory contents are validated by cyclic-redundancy check (CRC) to enhance operational reliability.

The small 3mm × 3mm WQFN package is designed for space-limited applications. The device is fully specified for operation over the –40°C to +125°C temperature range.
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Technical documentation

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* Data sheet ADS127L21 512kSPS, Programmable Filter, 24-Bit, Wideband Delta-Sigma ADC datasheet (Rev. C) PDF | HTML Aug 13, 2025
Application note A Simple, Java-Based CRC Calculator PDF | HTML Mar 4, 2026
Application note Design Considerations for Multiple Wide Bandwidth Delta- Sigma ADCs in Simultaneous-Sampling Systems (Rev. A) PDF | HTML Dec 29, 2025
Application note Anti-Alias Filter Design for a 100kHz Bandwidth Data Acquisition Signal Chain (Rev. A) PDF | HTML Feb 27, 2025
Application brief Using TI ADCs for Noise, Vibration, and Harshness Measurements PDF | HTML Dec 3, 2024
Functional safety information ADS1x7Lx1x Functional Safety FIT Rate, FMD and Pin FMA (Rev. C) PDF | HTML Sep 26, 2024
Application note Achieve High SNR with the PGA855, Fully Differential Programmable-Gain Amplifier PDF | HTML Mar 21, 2024
Application brief Benefits of Integrated FIR and IIR Filters in Delta-Sigma ADCs PDF | HTML May 11, 2023
Application note Four Channel Analog to Digital Interface with Sitara AM243x MCU+ PDF | HTML Apr 20, 2023
Application note Digital Filter Types in Delta-Sigma ADCs (Rev. A) PDF | HTML Mar 29, 2023

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

ADS127L21EVM-PDK — ADS127L21 evaluation module for ADC with easy-to-drive inputs and wideband or low-latency filters

The ADS127L21EVM-PDK is an evaluation platform for the ADS127L21 24-bit, high-speed custom-wide-bandwidth filter delta-sigma (ΔΣ) analog-to-digital converter (ADC). The evaluation kit includes the ADS127L21EVM board, the PHI controller board, and accompanying computer software that enables the (...)
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Support software

ADS127L21-C-EXAMPLE-CODE — ADS127L21 example C code

Expedite your embedded design using this example C code for the ADS127L21
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Simulation model

ADS127L21 IBIS Model

SBAM498.IBS (534 KB) - IBIS model
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Calculation tool

ADC-DESIGN-CALC — Online design calculator tool for TI Precision ADCs

ADC-DESIGN-CALC is an online resource with multiple ADC calculator tools (such as Digital Filter Response, Code-to-Voltage, CMR, CRC, etc.) for TI Precision ADCs.
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Calculation tool

ANALOG-ENGINEER-CALC — PC software analog engineer's calculator

The analog engineer’s calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting operational-amplifier (...)

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Design tool

ADC-DAC-TO-VREF-SELECT-DESIGN-TOOL — The ADC-TO-VREF-SELECT tool enables the pairing of TI ADCs, DACs, and series voltage references.

The ADC-TO-VREF-SELECT tool enables the pairing of TI analog-to-digital converters (ADCs) and series voltage references. Users can select an ADC device and the desired reference voltage, and the tool will list up to two voltage reference recommendations.
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Reference design

TIDA-010945 — Integrated, low-drift precision digital multimeters & data acquisition signal chain reference design

This reference design explains the theory, design and testing of a high-performance signal chain for DC measurements. The main target application is digital multimeters (DMMs), however the design can also be applicable to other applications, such as data acquisition (DAQ) and condition monitoring. (...)

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Package Pins CAD symbols, footprints & 3D models
WQFN (RUK) 20 Ultra Librarian
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