EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. MAX11902 18-Bit, 1Msps, Low-Power, Fully Differential SAR ADC General Description Benefits and Features The MAX11902 is an 18-bit, 1Msps, single-channel, fully High DC/AC Accuracy Provides Better Measurement differential SAR ADC with internal reference buffers. The Quality MAX11902 provides excellent static and dynamic perfor- 18-Bit Resolution with No Missing Codes mance with best-in-class power consumption that directly 1.5 LSB INL and 0.5 LSB DNL Maximum at 18 scales with throughput. The device has a unipolar differ- Bits ential V input range. Supplies include a 3.3V supply REF 98.9dB SNR and 98.8dB SINAD at f = 10kHz IN for the reference buffers, a 1.8V analog supply, a 1.8V -125dB SFDR and -123dB THD at f = 10kHz IN digital supply, and a 1.5V to 3.6V digital interface supply. High Sampling Rate SAR Architecture Enables Fast This ADC achieves 98.9dB SNR and -123dB THD, guar- Settling and Acquisition antees 18-bit resolution with no-missing codes and 1.5 1Msps Throughput with No Pipeline Delay LSB INL (max). Integration Simplifies Design The MAX11902 communicates data using a SPI- compatible serial interface. The MAX11902 is offered in a Integrated Reference Buffers 20-pin, 4mm x 4mm, TQFN package and is specified over V Unipolar Differential Analog Input Range REF the -40C to +85C* operating temperature range. Scalable Ultra-Low Power Supply Reduces Power Consumption Applications 6.7mW at 1Msps Test and Measurement Scale as 6.7W/ksps Automatic Test Equipment Flexible Low-Voltage Supplies Save Cost Medical Instrumentation 1.8V Analog and Digital Core Supply Process Control and Industrial Automation 1.5V to 3.6V Digital Interface Supply Data Acquisition Systems 3.3V REFVDD Reference Buffer Supply Telecommunications Flexible, Industry-Standard Serial Interface and Small Battery-Powered Equipment Package Reduce Size SPI-/QSPI-/MICROWIRE /DSP-Compatible Ordering Information and Selector Guide appears at end of data sheet. 20-Pin, 4mm x 4mm, TQFN Package *For extended operation temperature, contact Maxim. Application Diagram 16-Bit to 20-Bit SAR ADC Family 16-BIT 18-BIT 20-BIT 1.5 TO 3.3V 3.6V 1.8V 1.8V 3.6V 1.6Msps MAX11901 MAX11903 MAX11905 REFVDD AVDD DVDD OVDD 7.5 1Msps MAX11900 MAX11902 MAX11904 REFIN AIN+ DIN 0 TO 3.3V 4-WIRE SCLK 1nF MAX11902 SPI COG DOUT INTERFACE CNVST AIN- 7.5 REF REFGND AGND DGND 3.3V TO 0V 3.3V QSPI is a trademark of Motorola, Inc. 10F MICROWIRE is a registered trademark of National Semiconductor Corporation. 19-7170 Rev 2 9/18MAX11902 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........................................................................... 14 Analog Inputs 14 Input Settling . 16 Input Filtering 16 Voltage Reference Configurations 17 Transfer Function . 17 Digital Interface .............................................................................. 19 SPI Timing Diagram . 20 Register Write 22 Register Read 22 Register Map ................................................................................ 23 Mode Register 23 Conversion Result Register . 24 Chip ID Register 24 Typical Application Circuit ...................................................................... 24 Single-Ended Unipolar Input to Differential Unipolar Output 24 Single-Ended Bipolar Input to Differential Unipolar Output . 24 Layout, Grounding, and Bypassing ............................................................... 24 Definitions................................................................................... 27 Integral Nonlinearity . 27 Differential Nonlinearity 27 Offset Error . 27 Gain Error . 27 Signal-to-Noise Ratio 27 Signal-to-Noise Plus Distortion 27 Maxim Integrated 2 www.maximintegrated.com