20-Bit, 1.6Msps, Low-Power, Fully Differential 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.

Applications

* Automatic Test Equipment * Battery-Powered Equipment * Data Acquisition Systems * Medical Instrumentation * Process Control and Industrial Automation * Telecommunications * Test and Measurement

* 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