Maxim MAX11950 20位1.6Msps全差分SAR ADC解决方案

Maxim公司的MAX11950是20位1.6Msps单路全差分SAR ADC,提供极好的静态和动态性能以及功耗性能,SNR=98.3dB,THD=-123dB,保证20位分辨率而不丢失码和6 LSB INL,器件具有SPI兼容的串口,主要用在测试测量,自动测量设备(ATE),医疗仪器,过程控制和工业自动化,数据采集系统,通信设备以及以电池为电源的设备.本文介绍了MAX11905主要优势和特性,功能框图, 单极和双极单端输入电路图, MAX11905差分评估板主要特性, 系统框图,电路图和材料清单以及PCB元件布局图.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.MAX11905主要优势和特性: High DC/AC Accuracy Provides Better Measurement Quality 20-Bit Resolution with No Missing Codes ±6 LSB INL and ±1 LSB DNL Maximum at 16 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 MAX11905应用:Test and Measurement Automatic Test Equipment Medical Instrumentation Process Control and Industrial Automation Data Acquisition Systems Telecommunications Battery-Powered Equipment 图1. MAX11905功能框图图2. MAX11905单极单端输入电路图图3. MAX11905双极单端输入电路图MAX11905差分评估板The MAX11905 differential evaluation kit (EV kit) demonstrates the MAX11905, 20-bit, 1.6Msps, single-channel, fully differential SAR ADC with internal reference buffers. The EV kit uses the MAX44205, a low-noise fully differential operational amplifier. The EV kit includes a graphical user interface (GUI) that provides communication from Avnets ZedBoard development board for the Xilinx Zynq®-7000 SoC. The ZedBoard, not included with the EV kit, must be purchased through Avnet, Inc. 傲壹电子(AO-Electronics) 官网: 中文网：The ZedBoard communicates with the PC through an Ethernet cable using Windows XP®-, Windows Vista®-, Windows® 7-, or Windows 8/8.1-compatible software. The EV kit comes with the MAX11905ETP+ installed.MAX11905差分评估板主要特性: Peripheral Module and FMC Connector for Interface 75MHz SPI Clock Capability through FMC Connector 37.5MHz SPI Clock Capability through Peripheral Module Connector Sync In and Sync Out for Coherent Sampling On-Board Input Buffer (MAX44205) On-Board +3.0V Reference Voltage (MAX6126) Windows XP-, Windows Vista-, Windows 7-, and Windows 8/8.1-Compatible Software 图4. MAX11905差分评估板系统框图图5. MAX11905差分评估板电路图(1)图6. MAX11905差分评估板电路图(2)图7. MAX11905差分评估板电路图(3)图8. MAX11905差分评估板PCB元件布局图(1)图9. MAX11905差分评估板PCB元件布局图(2)