The MAX11903 is an 18-bit, 1.6Msps, single-channel, fully differential SAR ADC with internal reference buffers. The MAX11903 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 98dB SNR and -123dB THD, guarantees 18-bit resolution with no-missing codes and 2 LSB INL (max). The MAX11903 communicates data using a SPI-compatible serial interface. The MAX11903 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 * 18-Bit Resolution with No Missing Codes * ±2 LSB INL and ±0.5 LSB DNL Maximum at 18 Bits * 98.0dB SNR and 97.8dB 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