MAX11905:20-Bit, 1.6Msps, Low-Power, Fully Differential SAR ADC

Fastest and Lowest Power 20-Bit SAR ADC

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
MAX11905: Functional Diagram
MAX11905: Functional Diagram
Applications/Uses
  • Automatic Test Equipment
  • Battery-Powered Equipment
  • Data Acquisition Systems
  • Medical Instrumentation
  • Process Control and Industrial Automation
  • Telecommunications
  • Test and Measurement
DataSheet
titleDownload file
MAX11905 Data SheetMAX11905.pdf
Parametrics
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
MAX119052011600SARDSP-Compatible Serial
Microwire
QSPI
SPI
Diff. Only2.53.63.698.3-1236TQFN/20$29.90 @1k
Design kits & evaluation modules
Quality and Environmental Data
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX11905ETP+ActiveTQFN,;20 pin;16.8 mm²-40°C to +85°CLead Free
MAX11905ETP+TActiveTQFN,;20 pin;16.8 mm²-40°C to +85°CLead Free
MAX11905.pdf MAX11905
MAX11905_cn.pdf MAX11905
MAX11905.pdf MAX11905
MAX11905.pdf MAX11905
How to Select and Design Amplifier Buffer and Passive Components to Optimize Performance for the MAX11905 Evaluation Kits MAX44205
Distribution Automation Needs Highly Accurate Analog Data Converters MAX11905
MAX11905.pdf MAX11905