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

Fastest and Lowest Power 20-Bit SAR ADC

Product Details

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.

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 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)
$31.40 @1k
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Simplified Block Diagram

MAX11905: Functional Diagram MAX11905: Functional Diagram Zoom icon

Design & Development

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Description

The MAX11905 evaluation kit (EV kit) demonstrates the MAX11905, 20-bit, 1.6Msps, single-channel, fully differential SAR ADC with internal reference buffers. The EV kit includes a graphical user interface (GUI) that provides communication from the Avnet ZedBoard development board for the Xilinx® Zynq®-7000 SoC.

The ZedBoard communicates with the PC through an Ethernet cable using Windows XP®-, Windows Vista®-, Windows® 7-, or Windows 8/8.1-compatible software.

The EV kit comes with the MAX11905ETP+ installed.

Please contact the factory for the pin-compatible MAX11900ETP+ (16-bit, 1Msps), MAX11901ETP+ (16-bit, 1.6Msps), MAX11902ETP+ (18-bit, 1Msps), MAX11903ETP+ (18-bit, 1.6Msps), and MAX11904ETP+ (20-bit, 1Msps)

View Details

Features

  • Peripheral Module and FMC Connector for Interface
  • 75MHz SPI Clock Capability through FMC Connector
  • 37.5MHz SPI Clock Capability through Peripheral Module Connector
  • Sync In and Sync Out for Coherent Sampling
  • On-Board Input Buffers (MAX9632)
  • On-Board +3.0V Reference Voltage (MAX6126)
  • Windows XP-, Windows Vista-, Windows 7-, and Windows 8/8.1-Compatible Software

Description

The MAX11905 differential evaluation kit (EV kit) demonstrates the MAX11905, 20-bit, 1.6Msps, single-channel, fully differential SAR ADC with internal reference buffers. The EV kit uses the MAX44205, a low-noise fully differential operational amplifier. The EV kit includes a graphical user interface (GUI) that provides communication from Avnet’s ZedBoard™ development board for the Xilinx Zynq®-7000 SoC. The ZedBoard, not included with the EV kit, must be purchased through Avnet, Inc.

The ZedBoard communicates with the PC through an Ethernet cable using Windows XP®-, Windows Vista®-, Windows® 7-, or Windows 8/8.1-compatible software.

The EV kit comes with the MAX11905ETP+ installed.

View Details

Features

  • Peripheral Module and FMC Connector for Interface
  • 75MHz SPI Clock Capability through FMC Connector
  • 37.5MHz SPI Clock Capability through Peripheral Module Connector
  • Sync In and Sync Out for Coherent Sampling
  • On-Board Input Buffer (MAX44205)
  • On-Board +3.0V Reference Voltage (MAX6126)
  • Windows XP-, Windows Vista-, Windows 7-, and Windows 8/8.1-Compatible Software

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SIMULATION MODELS

MAX11900-5 IBIS Model

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Support & Training

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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)
$31.40 @1k

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

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