MAX11902 Datasheet, PDF (1/29 Pages) Maxim Integrated Products – Fully Differential SAR ADC

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 perfor-
mance with best-in-class power consumption that directly
scales with throughput. The device has a unipolar differ-
ential ±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 98.9dB SNR and -123dB THD, guar-
antees 18-bit resolution with no-missing codes and 1.5
LSB INL (max).
The MAX11902 communicates data using a SPI-
compatible 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 f_IN = 10kHz
• -125dB SFDR and -123dB THD at f_IN = 10kHz
●● High Sampling Rate SAR Architecture Enables Fast
Settling and Acquisition
• 1Msps Throughput with No Pipeline Delay
●● Integration Simplifies Design
• Integrated Reference Buffers
• ±V_REF 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*
*Future Product
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 0; 9/14