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MAX11902
EVALUATION KIT AVAILABLE
18-Bit, 1Msps, Low-Power, Fully Differential SAR ADC
General Description
The MAX11902 is an 18-bit, 1Msps, single-channel, fully differential SAR ADC with internal reference buffers. The MAX11902 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 98.9dB SNR and -123dB THD, guarantees 18-bit resolution with no-missing codes and 1.5 LSB INL (max).
The MAX11902 communicates data using a SPIcompatible serial interface. The MAX11902 is offered in a 20-pin, 4mm x 4mm, TQFN package and is specified over the -40°C to +85°C* operating temperature range.
Applications
●● Test and Measurement ●● Automatic Test Equipment ●● Medical Instrumentation ●● Process Control and Industrial Automation ●● Data Acquisition Systems ●● Telecommunications
●● Battery-Powered Equipment
Ordering Information and Selector Guide appears at end of data sheet.
*For extended operation temperature, contact Maxim.
Application Diagram
0 TO 3.3V 3.3V TO 0V
7.5Ω
1nF COG 7.5Ω
1.5 TO 3.3V 3.6V 1.8V 1.8V 3.6V
REFVDD AVDD DVDD OVDD
REFIN AIN+
DIN
MAX11902
SCLK DOUT
AIN- CNVST
REF REFGND AGND DGND 3.3V
10µF
4-WIRE SPI INTERFACE
Benefits and Features
●● High DC/AC Accuracy Provides Better Measurement Quality • 18-Bit Resolution with No Missing Codes • ±1.5 LSB INL and ±0.5 LSB DNL Maximum at 18 Bits • 98.9dB SNR and 98.8dB SINAD at fIN = 10kHz • -125dB SFDR and -123dB THD at fIN = 10kHz
●● High Sampling Rate SAR Architecture Enables Fast Settling and Acquisition • 1Msps Throughput with No Pipeline Delay
●● Integration Simplifies Design • Integrated Reference Buffers • ±VREF Unipolar Differential Analog Input Range
●● Scalable Ultra-Low Power Supply Reduces Power Consumption • 6.7mW at 1Msps • Scale as 6.7µW/ksps
●● 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
16-Bit to 20-Bit SAR ADC Family
1.6Msps 1Msps
16-BIT MAX11901 MAX11900
18-BIT MAX11903 MAX11902
20-BIT MAX11905 MAX11904
QSPI is a trademark of Motorola, Inc. MICROWIRE is a registered trademark of National Semiconductor Corporation.
19-7170; Rev 2; 9/18
MAX11902
18-Bit, 1Msps, Low-Power, Fully Differential SAR ADC
TABLE OF CONTENTS
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Features and Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Application Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 16-Bit to 20-Bit SAR ADC Family . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Package Thermal Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Typical Operating Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Functional Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Detailed Description . . . . . . . . . . . . . . . . . . .