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24-Bit, 10mW, 130dB SNR, 64ksps Delta-Sigma ADC with Integrated PGA

24-Bit ADC Offers the Highest SNR and Lowest Power in Its Class

Product Details

The MAX11270 is a 24-bit delta-sigma ADC that achieves excellent 130dB SNR while dissipating an ultra-low 10mW. Sample rates up to 64ksps allow both precision DC and AC measurements. Integral nonlinearity is guaranteed to 4ppm maximum. The THD is -122dB. The MAX11270 communicates via an SPI-compatible serial interface and is available in a small 24-pin TSSOP package.

The MAX11270 offers a 6.5nV/ noise programmable gain amplifier with gain settings between 1x to 128x. Optional buffers are also included to provide isolation of the signal inputs from the switched capacitor sampling network. This allows the MAX11270 to be used with high-impedance sources without compromising available dynamic range.

The MAX11270 operates from a single 2.7V to 3.6V analog supply, or split ±1.8V analog supplies, allowing the analog input to be sampled below ground. The digital supply range is 2.0V to 3.6V, allowing communication with 2.5V, 3V, or 3.3V logic.

Key Features

  • High Resolution for Instrumentation Applications that Require a Wide Dynamic Range
    • 130dB SNR at 1.9sps
    • 112dB SNR at 1000sps
    • 20.4-Bit Noise-Free Resolution at 1.9sps
    • 17.4-Bit Noise-Free Resolution at 1000sps
  • Longer Battery Life for Portable Applications
    • 2.4mA Operating Mode Current
    • 4.4mA PGA Low-Noise Mode Current
    • 1µA Sleep Current
  • High Accuracy for DC Measurements
    • 1ppm INL (typ), 4ppm (max)
  • Single or Split Analog Supplies Provide Input Voltage Range Flexibility
    • 2.7V to 3.6V (Single Supply) or ±1.8V (Split Supplies)
  • Flexible High-Performance Filter Architecture Simplifies Design
    • Programmable SINC Filter
  • Enables System Integration
    • Low-Noise PGA with Gains of 1, 2, 4, 8, 16, 32, 64, 128
    • Signal Buffer Optional
    • 3 General-Purpose I/Os
  • Enables Integrated Part and System Calibration for Gain and Offset
  • Robust 24-Pin TSSOP Packaging

Applications/Uses

  • ATE
  • High-Precision Portable Sensors
  • Medical Equipment
  • Scientific Instrumentation
Parametric specs for Precision ADCs (< 5Msps)
Resolution (bits) (ADC) 24
# Input Channels 1
Conv. Rate (ksps) (max) 64
Data Bus SPI
ADC Architecture Sigma-Delta
Diff/S.E. Input Both
External VREF (V) (min) 0
External VREF (V) (max) 3.6
Unipolar VIN (V) (max) 3.6
Bipolar VIN (±V) (max) 1.8
Package/Pins TSSOP/24
Budgetary
Price (See Notes)
$6.30 @1k
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Simplified Block Diagram

MAX11270: Typical Application Circuit MAX11270: Typical Application Circuit Zoom icon

Technical Docs

Design & Development

Click any title below to view the detail page where available.

Description

The evaluation kit (EV kit) demonstrates the MAX1127X family of 24-bit, 64ksps delta-sigma ADCs with integrated PGA. The EV kit includes a graphical user interface (GUI) that provides communication from the target device to the PC. The EV kit can operate in multiple modes:

  1. Standalone Mode: In "Standalone" mode, the EV kit is connected to the PC through a USB cable and performs a subset of the complete EV kit functions with limitation for sample rate and size.
  2. FPGA Mode: In "FPGA" mode, the EV kit is connected to an Avnet ZedBoard™ through a low-pin-count FMC connector. ZedBoard features a Xilinx® Zynq®-7000 SoC that connects to the PC through an Ethernet port, which allows the GUI to perform different operations with full control over mezzanine card functions. The EV kit with FPGA platform performs the complete suite of evaluation tests for the target IC
  3. User-Supplied SPI Mode: In addition to the USB and FMC interfaces, the EV kit provides two 12-pin PMOD-style headers for user-supplied SPI interface, to connect the signals for RDYB, SCLK, DIN, DOUT, and CSB.

    The EV kit includes Windows XP®-, Windows® 7 and Windows 8.1-compatible software to exercise the features of the IC. The EV kit GUI allows different sample sizes, adjustable sampling rates, on-board or external reference options, and graphing software that includes the FFT and histogram of the sampled signals with the ability to save plots in .jpg or .csv formats.

    The ZedBoard board accepts a +12V AC-DC wall adapter. The EV kit can be powered by the ZedBoard or by a local 12V supply. The EV kit has on-board transformers and digital isolators to separate the IC from the ZedBoard/on-board processor.

    The MAX11270 EV kit comes installed with a MAX11270EUG+ in a 24-pin TSSOP package.

View Details

Features

  • High-Speed USB, FMC Connector, and PMOD Connector
  • 5MHz SPI Interface
  • Various Sample Sizes and Sample Rates
  • Collects Up to 1 Million Samples (with FPGA Platform)
  • Time Domain, Frequency Domain, and Histogram Plotting
  • Save Plots as jpg, bmp or csv
  • Sync In and Sync Out for Coherent Sampling (with FPGA Platform)
  • On-Board DAC (MAX542) for DC Signal-Level Generation
  • On-Board Voltage Reference (MAX6126)
  • Proven PCB Layout
  • Fully Assembled and Tested
  • Windows XP-, Windows 7-, and Windows 8.1-Compatible Software
  • Savable ADC Configurations

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SIMULATION MODELS

MAX11270 IBIS Model

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Parameters

Parametric specs for Precision ADCs (<u><</u> 5Msps)
Resolution (bits) (ADC) 24
# Input Channels 1
Conv. Rate (ksps) (max) 64
Data Bus SPI
ADC Architecture Sigma-Delta
Diff/S.E. Input Both
External VREF (V) (min) 0
External VREF (V) (max) 3.6
Unipolar VIN (V) (max) 3.6
Bipolar VIN (±V) (max) 1.8
Package/Pins TSSOP/24
Budgetary
Price (See Notes)
$6.30 @1k

Key Features

  • High Resolution for Instrumentation Applications that Require a Wide Dynamic Range
    • 130dB SNR at 1.9sps
    • 112dB SNR at 1000sps
    • 20.4-Bit Noise-Free Resolution at 1.9sps
    • 17.4-Bit Noise-Free Resolution at 1000sps
  • Longer Battery Life for Portable Applications
    • 2.4mA Operating Mode Current
    • 4.4mA PGA Low-Noise Mode Current
    • 1µA Sleep Current
  • High Accuracy for DC Measurements
    • 1ppm INL (typ), 4ppm (max)
  • Single or Split Analog Supplies Provide Input Voltage Range Flexibility
    • 2.7V to 3.6V (Single Supply) or ±1.8V (Split Supplies)
  • Flexible High-Performance Filter Architecture Simplifies Design
    • Programmable SINC Filter
  • Enables System Integration
    • Low-Noise PGA with Gains of 1, 2, 4, 8, 16, 32, 64, 128
    • Signal Buffer Optional
    • 3 General-Purpose I/Os
  • Enables Integrated Part and System Calibration for Gain and Offset
  • Robust 24-Pin TSSOP Packaging

Applications/Uses

  • ATE
  • High-Precision Portable Sensors
  • Medical Equipment
  • Scientific Instrumentation

Description

The MAX11270 is a 24-bit delta-sigma ADC that achieves excellent 130dB SNR while dissipating an ultra-low 10mW. Sample rates up to 64ksps allow both precision DC and AC measurements. Integral nonlinearity is guaranteed to 4ppm maximum. The THD is -122dB. The MAX11270 communicates via an SPI-compatible serial interface and is available in a small 24-pin TSSOP package.

The MAX11270 offers a 6.5nV/ noise programmable gain amplifier with gain settings between 1x to 128x. Optional buffers are also included to provide isolation of the signal inputs from the switched capacitor sampling network. This allows the MAX11270 to be used with high-impedance sources without compromising available dynamic range.

The MAX11270 operates from a single 2.7V to 3.6V analog supply, or split ±1.8V analog supplies, allowing the analog input to be sampled below ground. The digital supply range is 2.0V to 3.6V, allowing communication with 2.5V, 3V, or 3.3V logic.

Simplified Block Diagram

MAX11270: Typical Application Circuit MAX11270: Typical Application Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal