Fully Differential SAR ADC - Maxim
Description
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MAX11905
20-Bit, 1.
6Msps, Low-Power, Fully Differential SAR ADC
General Description
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 SPIcompatible 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.
Applications
●● Test and Measurement ●● Automatic Test Equipment ●● Medical Instrumentation ●● Process Control and Industrial Automation ●● Data Acquisition Systems ●● Telecommunications ●● Battery-Powered Equipment
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
MAX11905
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 • 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 Supplie...
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