中国电子技术网

设为首页 网站地图 加入收藏

 

[原创] Maxim MAX11192 12位2MSPS SAR ADC解决方案

关键词:工业控制 PLC 马达控制 传感器 MAX11192

时间:2017-09-26 10:42:44       作者:Maxim       来源:中电网

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
详情请见:
https://datasheets.maximintegrated.com/en/ds/MAX11192.pdf
https://datasheets.maximintegrated.com/en/ds/MAX11192EVKIT.pdf
MAX11192.pdf
MAX11192EVKIT.pdf

 

猜你喜欢