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MAX11905
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MAX11905

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20-Bit, 1.6Msps, Low-Power, Fully Differential SAR ADC

Fastest and Lowest Power 20-Bit SAR ADC

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Product Details

See parametric specs for Precision ADCs (< 5Msps)

Key Features

See parametric specs for Precision ADCs (< 5Msps)
Parametric specs for Precision ADCs (< 5Msps)
Resolution (bits) (ADC) 20
# Input Channels 1
Conv. Rate (ksps) (max) 1600
Data Bus DSP-Compatible Serial
Microwire
QSPI
SPI
ADC Architecture SAR
Diff/S.E. Input Diff. Only
External VREF (V) (min) 2.5
External VREF (V) (max) 3.6
Unipolar VIN (V) (max) 3.6
INL (±LSB) 6
Package/Pins TQFN/20
Budgetary
Price (See Notes) 		36.61
See parametric specs for Precision ADCs (< 5Msps)
View Less

Simplified Block Diagram

Technical Docs

Data Sheet 20-Bit, 1.6Msps, Low-Power, Fully Differential SAR ADC Mar 19, 2019
App Note Applications of the MAX11905 ADC for the Ultrasound Imaging System
App Note Improve the Distortion of a Signal Generator to Measure a Wide-Dynamic-Range Data Acquisition System (DAS)
App Note Effects of Different Resistor Tolerances in a Differential ADC for THD Performance
App Note Achieving Desired Dynamic Performance in High-Speed, High-Resolution ADCs with Level Translators/Isolators in the System
App Note Distribution Automation Needs Highly Accurate Analog Data Converters
App Note Analog ICs for Low Voltage Systems
Tutorial A Simple ADC Comparison Matrix

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 .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.

Parameters

Parametric specs for Precision ADCs (<u><</u> 5Msps)
Resolution (bits) (ADC) 20
# Input Channels 1
Conv. Rate (ksps) (max) 1600
Data Bus DSP-Compatible Serial
Microwire
QSPI
SPI
ADC Architecture SAR
Diff/S.E. Input Diff. Only
External VREF (V) (min) 2.5
External VREF (V) (max) 3.6
Unipolar VIN (V) (max) 3.6
INL (±LSB) 6
Package/Pins TQFN/20
Budgetary
Price (See Notes) 		36.61
See parametric specs for Precision ADCs (<u><</u> 5Msps)

Key Features

  • High DC/AC Accuracy Provides Better Measurement Quality
    • 20-Bit Resolution with No Missing Codes
    • ±6 LSB INL and ±1 LSB DNL Maximum at 20 Bits
    • 98.3dB SNR and 98.1dB SINAD at fIN = 10kHz
    • -123dB THD at fIN = 10kHz
  • High Sampling Rate SAR Architecture Enables Fast Settling and Acquisition
    • 1.6Msps Throughput with No Pipeline Delay
  • Integration Simplifies Design
    • Integrated Reference Buffers, VREF = 2.5V to 3.6V
    • ±VREF Unipolar Differential Analog Input Range
  • Scalable Ultra-Low Power Supply Reduces Power Consumption
    • 9mW at 1.6Msps
  • Flexible Low-Voltage Supplies Save Cost
    • 1.8V Analog and Digital Core Supply
    • 1.5V to 3.6V Digital Interface Supply
    • 3.3V REFVDD Reference Buffer Supply
  • Flexible, Industry-Standard Serial Interface and Small Package Reduce Size
    • SPI-/QSPI™-/MICROWIRE®/DSP-Compatible
    • 20-Pin, 4mm x 4mm, TQFN Package

Applications/Uses

  • Automatic Test Equipment
  • Battery-Powered Equipment
  • Data Acquisition Systems
  • Medical Instrumentation
  • Process Control and Industrial Automation
  • Telecommunications
  • Test and Measurement

Description

The MAX11905 is a 20-bit, 1.6Msps, single-channel, fully differential SAR ADC with internal reference buffers. The MAX11905 provides excellent static and dynamic performance with best-in-class power consumption that directly scales with throughput. The device has a unipolar differential ±VREF input range. Supplies include a 3.3V supply for the reference buffers, a 1.8V analog supply, a 1.8V digital supply, and a 1.5V to 3.6V digital interface supply.

This ADC achieves 98.3dB SNR and -123dB THD, guarantees 20-bit resolution with no-missing codes and 6 LSB INL (max).

The MAX11905 communicates data using a SPI-compatible serial interface. The MAX11905 is offered in a 20-pin, 4mm x 4mm, TQFN package and is specified over the -40°C to +85°C operating temperature range.

Simplified Block Diagram

MAX11905: Functional Diagram MAX11905: Functional Diagram Zoom icon

Technical Docs

Data Sheet 20-Bit, 1.6Msps, Low-Power, Fully Differential SAR ADC Mar 19, 2019
App Note Applications of the MAX11905 ADC for the Ultrasound Imaging System
App Note Improve the Distortion of a Signal Generator to Measure a Wide-Dynamic-Range Data Acquisition System (DAS)
App Note Effects of Different Resistor Tolerances in a Differential ADC for THD Performance
App Note Achieving Desired Dynamic Performance in High-Speed, High-Resolution ADCs with Level Translators/Isolators in the System
App Note Distribution Automation Needs Highly Accurate Analog Data Converters
App Note Analog ICs for Low Voltage Systems
Tutorial A Simple ADC Comparison Matrix

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 .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.