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ADS127L21B

ACTIVE

24bit, 512kSPS wide-bandwidth delta-sigma ADC with high-linearity of 0.8 ppm max INL

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Data sheet

ADS127L21B

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 x 3
  • AC performance with dc precision:
    • Dynamic range (200kSPS): 111.5dB (typical)
    • INL: 0.2ppm of FSR (typical)
    • THD: –125dB (typical)
    • Offset drift: 50nV/°C (typical)
    • Gain drift: 0.5ppm/°C (typical)
  • Power-scalable speed modes:
    • Max speed: 512kSPS (33mW typical)
    • High speed: 400kSPS (26mW typical)
    • Mid speed: 200kSPS (14mW typical)
    • Low speed: 50kSPS (4.3mW typical)
  • Wideband or low-latency filter modes
  • Programmable data rates:
    • Wideband filter mode: 512kSPS
    • Low-latency filter mode: 1.365MSPS
  • Programmable IIR and FIR digital filters
  • Buffered inputs
    • 1.5µA input current typical, mid-speed mode
  • Input range: ±VREF or ±2VREF
  • Internal or external clock operation
  • Conversion latency (low-latency filter): 3µs
  • Functional Safety-Capable
  • AC performance with dc precision:
    • Dynamic range (200kSPS): 111.5dB (typical)
    • INL: 0.2ppm of FSR (typical)
    • THD: –125dB (typical)
    • Offset drift: 50nV/°C (typical)
    • Gain drift: 0.5ppm/°C (typical)
  • Power-scalable speed modes:
    • Max speed: 512kSPS (33mW typical)
    • High speed: 400kSPS (26mW typical)
    • Mid speed: 200kSPS (14mW typical)
    • Low speed: 50kSPS (4.3mW typical)
  • Wideband or low-latency filter modes
  • Programmable data rates:
    • Wideband filter mode: 512kSPS
    • Low-latency filter mode: 1.365MSPS
  • Programmable IIR and FIR digital filters
  • Buffered inputs
    • 1.5µA input current typical, mid-speed mode
  • Input range: ±VREF or ±2VREF
  • Internal or external clock operation
  • Conversion latency (low-latency filter): 3µs
  • Functional Safety-Capable

The ADS127L21B is a high-precision, 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.

The low-drift modulator achieves excellent dc precision with maximum 0.8ppm INL (0°C to 70°C) and outstanding ac performance with low wideband noise. 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.

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 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 and is pin-to-pin compatible to the ADS127L21.

The ADS127L21B is a high-precision, 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.

The low-drift modulator achieves excellent dc precision with maximum 0.8ppm INL (0°C to 70°C) and outstanding ac performance with low wideband noise. 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.

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 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 and is pin-to-pin compatible to the ADS127L21.
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* Data sheet ADS127L21B 512kSPS, High-Precision, 24-Bit, Wideband Delta-Sigma ADC datasheet PDF | HTML 16 Oct 2024
Application note Design Considerations for Multiple Wide Bandwidth Delta- Sigma ADCs in Simultaneous-Sampling Systems (Rev. A) PDF | HTML 29 Dec 2025

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 (...)
User guide: PDF | HTML
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Simulation model

ADS127L21B IBIS Model

SBAM523.ZIP (101 KB) - IBIS Model
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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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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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Simulation tool

TINA-TI — SPICE-based analog simulation program

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
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Reference designs

TIDA-010970 — Low-noise, highly linear digital multimeter and data acquisition signal chain reference design

The target application for this design includes digital multimeters (DMMs) that require ultra-high precision to measure dc signals. This design achieves effective dc accuracy using the ADS127L21B, a high-performance, 24-bit analog-to-digital converter (ADC) with effective linearity. An ultra-low (...)
Design guide: PDF
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WQFN (RUK) 20 Ultra Librarian
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