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MAX11905

MAX11905

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

Fastest and Lowest Power 20-Bit SAR ADC

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Overview

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.

MAX11905: Functional Diagram MAX11905: Functional Diagram Enlarge+

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

Parametric Specs

Part NumberResolution
(bits)		Input Chan.Conv. Rate
(ksps)		ADC ArchitectureData BusDiff/S.E. InputExternal VREF
(V)		External VREF
(V)		Unipolar VIN
(V)		SNR
(dB)		THD
(dB)		INL
(±LSB)		Package/PinsBudgetary
Price
ADCmaxminmaxmaxSee Notes
MAX11905 2011600SAR
DSP-Compatible Serial
Microwire
QSPI
SPI
Diff. Only2.53.63.698.3-1236
TQFN/20
$31.40 @1k
See All Precision ADCs (< 5Msps) (443)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources


MAX11905EVKIT: Evaluation Kit for the MAX11900, MAX11901, MAX11902, MAX11903, MAX11904, and MAX11905
MAX11905DIFEVKIT: Evaluation Kit for the MAX11905

Technical Documents

App Note 6646 Effects of Different Resistor Tolerances in a Differential ADC for THD Performance
App Note 6488 Achieving Desired Dynamic Performance in High-Speed, High-Resolution ADCs with Level Translators/Isolators in the System
App Note 6034 How to Select and Design Amplifier Buffer and Passive Components to Optimize Performance for the MAX11905 Evaluation Kits
App Note 5988 Distribution Automation Needs Highly Accurate Analog Data Converters
App Note 3741 Analog ICs for Low Voltage Systems
Tutorial 2094 A Simple ADC Comparison Matrix

Quality and Environmental Data

Product Reliability Reports: MAX11905.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Tools & Models

  • MAX11900-5 IBIS Model

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    Quality And Environmental

    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >

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    Related Resources

    Tools & Models

    Technical Docs

    Reference Designs

    Type ID Title
    Evaluation Board8616MAX11905DIFEVKIT Evaluation Kit for the MAX11905
    Evaluation Board8400MAX11905EVKIT Evaluation Kit for the MAX11900, MAX11901, MAX11902, MAX11903, MAX11904, and MAX11905