Maxim公司的MAX11192是同时取样2MSPS的双路SAR ADC,具有12位分辨率和差分输入,16引脚3mm x 2mm超细TDFN封装,提供极好的静态和动态性能,工作电压3.0V-5.25V,SNR大于73dB,THD典型值为-108dB,不丢失码的INL为±0.5LSB,主要用在编码器,解析器,LVDT,马达电流检测和PLC.本文介绍了MAX11192主要优势和特性,应用框图和应用电路,以及评估板MAX11192 EVK优势和特性,框图,电路图,材料清单和PCB设计图.

　　The MAX11192 is a dual-channel SAR ADC with simultaneoussampling at 2Msps, 12-bit resolution, and differentialinputs. Available in a tiny 16-pin, 3mm x 2mm ultra TDFNpackage, this ADC delivers excellent static and dynamicperformance while operating from a supply voltage overthe range of 3.0V to 5.25V. An integrated reference further reduces board area and component count.

　　The MAX11192 achieves 73dB of SNR (min), -108dBof THD (typ), and INL less than ±0.5LSB with no missingcodes. The SPI-compatible serial interface includesa separate data output for each channel. Specificationsapply over the extended industrial temperature range of-40 ℃ to +125 ℃ .

　　MAX11192主要优势和特性:

　　●● Tiny 16-Pin, 3mm x 2mm, Ultra TDFN Package

　　●● Up to 2Msps Throughput Rate

　　●● Two Simultaneous-Sampling ADC Cores

　　●● 2.5V Integrated Reference and Reference Buffers

　　●● Two Data Outputs for the Two Simultaneous-Sampling ADCs

　　●● No Overhead Clock Cycles; 12 Clock Cycles for12-Bit Result

　　●● Balanced, Differential Input Range of ±VREF

　　●● 73dB SNR (min), 108dB THD (typ) at 10kHz

　　●● INL < ±0.5LSB, No Missing Codes

　　MAX11192应用:

　　●● Encoders

　　●● Resolvers

　　●● LVDT

　　●● Current Sensing in Motors

　　●● PLC

　　图1.MAX11192应用框图

　　图2.MAX11192单极单端输入应用框图

　　图3.MAX11192双极单端输入应用框图

　　评估板MAX11192 EVK

　　The MAX11192 evaluation kit (EV kit) provides a proven design to evaluate the MAX11192 of 12-bit, 2-channel, 2Msps, fully differential simultaneously sampling SAR ADCs with an internal reference. The EV kit includes an evaluation board and a graphical user interface (GUI) that provides communication from the target device to the PC through a ZedBoard™ with a Xilinx Zynq® -7000 SOC. The EV kit is connected to a ZedBoard through a low-pin-count FMC connector and a ZedBoard connected to the PC through an Ethernet port.

　　The EV kit includes Windows XP®, Windows® 7 and Windows 8 compatible software for exercising the features of the IC. The EV kit GUI allows different sample sizes, adjustable sampling rates, and graphing software that includes the FFT and histogram of the sampled signals.

　　The EV kit can be powered by +12V supply from ZedBoard or by an external power supply. The EV kit has two DC-DC converters and 5V LDO which provide all nec­essary supplies for operation with ZedBoard.The MAX11192 EV kit comes installed with a MAX11192ATE+ in a 16-pin, 2mm x 3mm TQFN-EP package.

　　The EV kit aims to be used with an external resolver or encoder to monitor and measuring degrees of rotation or absolute position of the rotor at any given moment.

　　评估板MAX11192 EVK优势和特性:

　　50MHz SPI Clock Capability through FMC Connector

　　Various Sample Sizes and Sample Rates

　　Collects Up to 1 Million Samples

　　Time Domain, Frequency Domain, and Histogram Plotting

　　Sync In and Sync Out for Coherent Sampling

　　On-Board Input Buffers: MAX44242 and MAX44205 (Fully Differential)

　　On-Board External Voltage Reference: MAX6126

　　Proven PCB Layout

　　Fully Assembled and Tested

　　Windows XP, Windows 7, and Windows 8-Compatible Software

　　图4.评估板MAX11192 EVK外形图

　　图5.评估板MAX11192 EVK系统框图

　　图6.评估板MAX11192 EVK电路图(1)

　　图7.评估板MAX11192 EVK电路图(2)

　　图8.评估板MAX11192 EVK电路图(3)

　　图9.评估板MAX11192 EVK电路图(4)

　　图10.评估板MAX11192 EVK电路图(5)

　　评估板MAX11192 EVK材料清单(BOM):

　　图11.评估板MAX11192 EVK PCB设计图(1):左:顶层丝印;右:顶层焊点

　　图12.评估板MAX11192 EVK PCB设计图(2):左:顶层模板;右:顶层

　　图13.评估板MAX11192 EVK PCB设计图(3):左:内2层;右:内3层

　　图14.评估板MAX11192 EVK PCB设计图(4):左:内4层;右:内6层

　　图15.评估板MAX11192 EVK PCB设计图(5):左:底层丝印;右:底层焊点

　　图16.评估板MAX11192 EVK PCB设计图(6):左:底曾模板;右:底层

　　MAXIM是美信公司(Maxim Integrated Products)的英文缩写，全球最好的模拟信号和混合信号半导体公司。同时MAXIM也是一款时尚潮流杂志的名字，maxim内容涵盖了音乐、体育、电视、电影、潮流名人等。也是比较温和的男性杂志，以更多的消遣内容为主。

　　2001年，Maxim并购了著名的Dallas Semiconductor。是全球最好的模拟信号和混合信号半导体公司.

　　它们的使命是不断创造高品质的模拟工程解决方案，在世界范围内为基于微处理器的电子产品客户提供增值服务。它们通过努力达到它们的成本与业绩Maxim Integrated Products成立于1983年，总部位于美国加利福尼亚的Sunnyvale，公司拥有9300多名员工，是世界范围内模拟和混合信号集成产品的设计、开发与生产领域的领导者之一。通过对温度、压力、声音等现实世界的各种信号进行检测、放大，并将其转换成计算机处理所需要的数字信号, Maxim的电路把现实世界与数字世界“连接”在一起。

　　目标、缩短新品上市时间并不断提高它们的生产能力，坚持不懈地为它们的客户和公司股权持有者提供最好的服务。

　　任何电子产品的核心都是一个数字核，它与人类、真实的物理世界、供电电源及其它数字系统相关联。Maxim是全球模拟、混合信号、高频及数字电路设计、研发、制造的领导者，所提供的产品能够实现上述数字内核与周边系统的连接。它们在世界范围内拥有大约35,000个大型客户。

　　它们的半导体产品是连接数字处理器与物理世界的桥梁。

　　详情请见:

MAX11192.pdf