原标题：Maxim MAX11960差分SAR ADC解决方案

　　Maxim公司的MAX11960是集成了基准缓冲器的双路通时取样20位1Msps差分SAR ADC,具有极好的静态和动态性能以及最好的功耗,SNR为99dB,THD为-123dB,INL为5 LSB,不丢失码的20位分辨率,采用SPI兼容的串行接口进行通信数据.主要用在运动控制的编码器和解码器,自动测试设备(ATE),医疗设备,过程控制和工业自动化,数据采集系统,通信设备和冗余测量.本文介绍了MAX11960主要特性和优势,功能框图,多种应用电路,以及评估板MAX11960 EV kit主要特性,电路图,材料清单和PCB设计图.

　　The MAX11960 is a 20-bit, 1Msps, dual simultaneous sampling, fully differential SAR ADC with internal reference buffers. The MAX11960 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 99dB SNR and -123dB THD, guarantees 20-bit resolution with no-missing codes and 5 LSB INL (max).

　　The MAX11960 communicates data using a SPI-compatible serial interface. The MAX11960 is offered in a 32-pin, 5mm x 5mm, TQFN package and is specified over the -40℃ to +85℃ operating temperature range.

　　MAX11960主要特性和优势:

　　20-Bit Resolution with No Missing Codes

　　1Msps Throughput with No Pipeline Delay

　　18mW at 1Msps, Ultra-Low Power Consumption

　　±1.5LSB INL, Over Temperature

　　±1 LSB DNL Maximum at 20 Bits

　　99dB SNR at fIN= 10kHz

　　99dB SINAD at fIN= 10kHz

　　-123dB THD at fIN= 10kHz

　　±VREF Unipolar Differential Analog Input Range

　　VREF = 2.5V to 3.6V

　　Integrated Reference Buffers

　　1.8V Analog and Digital Core Supply

　　3.3V REFVDD Reference Buffer Supply

　　1.5V to 3.6V Digital Interface Supply

　　Serial Interface SPI/QSPIK/MICROWIREM/DSP-Compatible

　　-40℃ to +85℃ Operation*

　　32-Pin, 5mm x 5mm, TQFN Package

　　MAX11960应用:

　　Encoder and Resolver in Motion Control

　　Automatic Test Equipment

　　Medical Instrumentation

　　Process Control and Industrial Automation

　　Data Acquisition Systems

　　Telecommunications

　　Redundant Measurement

　　图1.MAX11960功能框图

　　图2.MAX11960单极单端输入电路图

　　图3.MAX11960双极单端输入电路图

　　图4.MAX11960单极差分输入电路图

　　评估板MAX11960EV kit

　　The MAX11960 evaluation kit (EV kit) demonstrates the device’s, 20-bit, 1.0Msps, dual-channel, fully differential SAR ADC with internal reference buffers. The EV kit includes a graphical user interface (GUI) that provides communication from Avnet’s ZedBoard™ development board for the Xilinx Zynq®-7000 SoC. The ZedBoard is not included with the EV kit and must be purchased through Avnet.

　　The ZedBoard communicates with the PC through an Ethernet cable using Windows® 7, or Windows 8/8.1-compatible software.The EV kit comes with the MAX11960ETP+ installed.

　　评估板MAX11960 EV kit主要特性:

　　FMC Connector for Interface

　　75MHz SPI Clock Capability through FMC Connector

　　Sync In and Sync Out for Coherent Sampling

　　On-Board Input Buffers (MAX9632)

　　On-Board +3.0V Reference Voltage (MAX6126)

　　Windows 7, and Windows 8/8.1-Compatible Software

　　评估板MAX11960 EV kit应用:

　　Automatic Test Equipment

　　Data Acquisition Systems

　　Encoder and Resolver in Motion Control

　　Medical Instrumentation

　　Process Control and Industrial Automation

　　Redundant Measurement

　　Telecommunications

　　图5.评估板MAX11960 EV kit系统框图

　　图6.评估板MAX11960 EV kit电路图(1)

　　图7.评估板MAX11960 EV kit电路图(2)

　　图8.评估板MAX11960 EV kit电路图(3)

　　图9.评估板MAX11960 EV kit电路图(4)

　　图10.评估板MAX11960 EV kit电路图(5)

　　图11.评估板MAX11960 EV kit电路图(6)

　　评估板MAX11960 EV kit材料清单:

　　详情请见:

MAX11960.pdf

MAX11960EVKIT.pdf