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

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1、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, sin

2、gle-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 f

3、or 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 interfac

4、e. The MAX11905 is offered in a 20-pin, 4mm x 4mm, TQFN package and is specified over the -40C to +85C 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 Codes6 LSB INL and 1 LSB DNL Maximum at 16 Bits98.3dB SNR and 9

5、8.1dB SINAD at fIN = 10kHz-123dB THD at fIN = 10kHzHigh Sampling Rate SAR Architecture Enables Fast Settling and Acquisition 1.6Msps Throughput with No Pipeline DelayIntegration Simplifies Design Integrated Reference Buffers, VREF = 2.5V to 3.6VVREF Unipolar Differential Analog Input RangeScalable U

6、ltra-Low Power Supply Reduces Power Consumption 9mW at 1.6MspsFlexible Low-Voltage Supplies Save Cost 1.8V Analog and Digital Core Supply1.5V to 3.6V Digital Interface Supply3.3V REFVDD Reference Buffer SupplyFlexible, Industry-Standard Serial Interface and Small Package Reduce Size SPI-/QSPI-/MICRO

7、WIRE/DSP-Compatible20-Pin, 4mm x 4mm, TQFN PackageMAX11905应用:Test and MeasurementAutomatic Test EquipmentMedical InstrumentationProcess Control and Industrial AutomationData Acquisition SystemsTelecommunicationsBattery-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MAX119

8、05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 in

9、terface (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 X

10、P-, 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 Interface75MHz SPI Clock Capability through FMC Connector37.5MHz SPI Clock Capability through Peripheral Module ConnectorSyn

11、c In and Sync Out for Coherent SamplingOn-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)