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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

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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 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 (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 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 (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
  • Wideband or low-latency filter option
  • Programmable data rate:
    • Up to 512 kSPS (wideband filter)
    • Up to 1.365 MSPS (low-latency filter)
    • Up to 2.048 MSPS (partial wideband filter)
  • Preset or custom coefficient FIR filter
  • Custom biquad IIR filter
  • Input range: ±V REF or ±2 V REF
  • AC accuracy with dc precision:
    • Dynamic range (200 kSPS): 111.5 dB, typical
    • THD: –120 dB, typical
    • INL: 0.9 ppm of FS, typical
    • Offset drift: 50 nV/°C, typical
    • Gain drift: 0.6 ppm/°C, typical
  • Power-scalable architecture:
    • Max-speed range: 512 kSPS (wideband filter)
    • High-speed range: 400 kSPS (wideband filter)
    • Mid-speed range: 200 kSPS (wideband filter)
    • Low-speed range: 50 kSPS (wideband filter)
  • Easy-drive buffered inputs
  • Internal or external clock operation
  • Wideband or low-latency filter option
  • Programmable data rate:
    • Up to 512 kSPS (wideband filter)
    • Up to 1.365 MSPS (low-latency filter)
    • Up to 2.048 MSPS (partial wideband filter)
  • Preset or custom coefficient FIR filter
  • Custom biquad IIR filter
  • Input range: ±V REF or ±2 V REF
  • AC accuracy with dc precision:
    • Dynamic range (200 kSPS): 111.5 dB, typical
    • THD: –120 dB, typical
    • INL: 0.9 ppm of FS, typical
    • Offset drift: 50 nV/°C, typical
    • Gain drift: 0.6 ppm/°C, typical
  • Power-scalable architecture:
    • Max-speed range: 512 kSPS (wideband filter)
    • High-speed range: 400 kSPS (wideband filter)
    • Mid-speed range: 200 kSPS (wideband filter)
    • Low-speed range: 50 kSPS (wideband filter)
  • Easy-drive buffered inputs
  • Internal or external clock operation

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

Preset or custom infinite and finite impulse response (IIR and FIR) digital filters provide standard or customized response profiles, such as A-weighting compensation. Wideband or low-latency filter modes optimize ac-signal performance or data throughput of dc signals, all in one device.

The device features an easy-drive signal and reference inputs for reduced signal loading. The low-drift modulator achieves excellent dc precision with low in-band noise for outstanding ac performance. The power-scalable architecture provides four speed ranges to optimize data rate, resolution, and power consumption.

The serial interface features daisy-chain capability to reduce the SPI I/O over an isolation barrier. Input and output data and register memory are validated by the optional cyclic-redundancy check (CRC) feature to enhance operational reliability.

The small 3-mm × 3-mm 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 a programmable digital filter with data rates up to 512 kSPS using the wideband filter and up to 1365 kSPS using the low-latency filter. The device offers an excellent combination of ac performance and dc precision with low power consumption.

Preset or custom infinite and finite impulse response (IIR and FIR) digital filters provide standard or customized response profiles, such as A-weighting compensation. Wideband or low-latency filter modes optimize ac-signal performance or data throughput of dc signals, all in one device.

The device features an easy-drive signal and reference inputs for reduced signal loading. The low-drift modulator achieves excellent dc precision with low in-band noise for outstanding ac performance. The power-scalable architecture provides four speed ranges to optimize data rate, resolution, and power consumption.

The serial interface features daisy-chain capability to reduce the SPI I/O over an isolation barrier. Input and output data and register memory are validated by the optional cyclic-redundancy check (CRC) feature to enhance operational reliability.

The small 3-mm × 3-mm 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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Type Title Date
* Data sheet ADS127L21 512-kSPS, Programmable Wideband Filter, 24-Bit, Delta-Sigma ADC datasheet PDF | HTML 24 Mar 2023
EVM User's guide ADS127L21EVM-PDK Evaluation Module PDF | HTML 08 Feb 2023
Certificate ADS127L21EVM-PDK EU RoHS Declaration of Conformity (DoC) 24 Jan 2023
Technical article Leverage coherent sampling and FFT windows when evaluating SAR ADCs (Part 1) 13 Mar 2015

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

ADS127L21 IBIS Model

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

ADC-INPUT-CALC — Analog-to-digital converter (ADC) input driver design tool supporting multiple input types

ADC-INPUT-CALC is an online tool that provides support for designing the input buffer to an analog-to-digital converter (ADC). It offers 24 different op-amp based buffer circuits that can be used to drive an ADC input. The available topologies cover differential, single-ended and (...)
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Calculation tool

ANALOG-ENGINEER-CALC — 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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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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WQFN (RUK) 20 View options
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