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

 

Part Number	Replacement	Explanation

Description

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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 ±V_REF 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 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 f_IN = 10kHz
  • -123dB THD at f_IN = 10kHz
• High Sampling Rate SAR Architecture Enables Fast Settling and Acquisition
  • 1.6Msps Throughput with No Pipeline Delay
• Integration Simplifies Design
  • Integrated Reference Buffers, V_REF = 2.5V to 3.6V
  • ±V_REF 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