CAM350软件的学习笔记目录1. CAM3501. 一. Gerber知识2. 二.CAM3503. 三.CAM350操作4. 附录Gerber知识l Gerber 文件的格式包括：¡ RS-274-X （常用）¡ RS-274-D （常用）¡ RS-274¡ Fire 9000¡ Mda 9000¡ Barco DPFl 标准的gerber file 格式可分为RS-274 与RS-274X 两种，其不同在于：¡ RS-274 格式的gerber file 与aperture 是分开的不同文件。¡ RS-274X 格式的aperture 是整合在gerber file 中的，因此不需要aperture文件(即，内含D 码)。PCB生成Gerber最好就是选用RS-274x格式，既标准，又兼容性高。l 数据格式：整数位+小数位 。常用：¡ 3：3（公制，整数3 位，小数3 位）¡ 2：4（英制，整数2 位，小数4 位）¡ 2：3（英制，整数2 位，小数3 位）¡ 3：3（英制，整数3 位，小数3 位）l 前导零、后导零和不导零：¡ 例：025690 前导零后变为：25690 (Leading)¡ 025690 后导零后变为：02569 (Trailing)¡ 025690 不导零后变为：025690 (None)l 单位：¡ METRIC（mm）¡ ENGLISH（inch OR mil）l 单位换算：¡ 1 inch ＝ 1000 mil ＝ 2.54 cm ＝ 25.4 mm¡ 1 mm ＝ 0.03937 inch ＝ 39.37 mill GERBER 格式的数据特点：
上传时间： 2013-10-19
上传用户：wayne595
Abstract: Many digital devices incORpORate analog circuits. FOR instance, microprocessORs, applicationspecificintegrated circuits (ASICs), and field-programmable gate arrays (FPGAs) may have internalvoltage references, analog-to-digital converters (ADCs) OR digital-to-analog converters (DACs). However,there are challenges when you integrate mORe analog onto a digital design. As with all things in life, inelectronics we must always trade one parameter fOR another, with the application dictating the propertrade-off of analog function. In this application note, we examine how the demand fOR economy of spaceand cost pushes analog circuits onto digital substrates, and what design challenges emerge.
上传时间： 2013-11-17
上传用户：菁菁聆听
The trend in ADCs and DACs is toward higher speeds and higher resolutions atreduced power levels. Modern data converters generally operate on ±5V (dualsupply) OR +5V (single supply). In fact, many new converters operate on a single +3Vsupply. This trend has created a number of design and applications problems whichwere much less impORtant in earlier data converters, where ±15V supplies and ±10Vinput ranges were the standard.
上传时间： 2013-11-16
上传用户：sjw920325
Abstract: This application note describes how sampling clock jitter (time interval errOR OR "TIE jitter") affectsthe perfORmance of delta-sigma digital-to-analog converters (DACs). New insights explain the impORtanceof separately specifying low-frequency (< 2x passband frequency) and high-frequency OR wideband (> 2xpassband frequency) jitter tolerance in these devices. The article also provides an application example ofa simple highly jittered cycle-skipped sampling clock and describes a method fOR generating a properbroadband jittered clock. The document then goes on to compare Maxim's audio DAC jitter tolerance tocompetitOR audio DACs. Maxim's exceptionally high jitter tolerance allows very simple and low-cost sampleclock implementations.
上传时间： 2013-10-25
上传用户：banyou
特点： 精确度0.1%满刻度 可作各式數學演算式功能如:A+B/A-B/AxB/A/B/A&B(Hi OR Lo)/|A|/ 16 BIT类比输出功能 输入与输出绝缘耐压2仟伏特/1分钟(input/output/power) 宽范围交直流兩用電源設計 尺寸小,穩定性高
上传时间： 2014-12-23
上传用户：ydd3625
The MAX5713/MAX5714/MAX5715 4-channel, low-power,8-/10-/12-bit, voltage-output digital-to-analog converters(DACs) include output buffers and an internal referencethat is selectable to be 2.048V, 2.500V, OR 4.096V. TheMAX5713/MAX5714/MAX5715 accept a wide supplyvoltage range of 2.7V to 5.5V with extremely low power(3mW) consumption to accommodate most low-voltageapplications. A precision external reference input allowsrail-to-rail operation and presents a 100kI (typ) load toan external reference.
上传时间： 2013-12-23
上传用户：ArmKing88
Abstract: Alexander Graham Bell patented twisted pair wires in 1881. We still use them today because they wORk so well. In addition we have the advantage ofincredible computer power within our wORld. Circuit simulatORs and filter design programs are available fOR little OR no cost. We combine the twisted pair and lowpassfilters to produce spectacular rejection of radio frequency interference (RFI) and electromagnetic interference (EMI). We also illustrate use of a precision resistORarray to produce a customizable differential amplifier. The precision resistORs set the gain and common mode rejection ratios, while we choose the frequencyresponse.
上传时间： 2014-11-26
上传用户：Vici
A MEMS microphone IC is unique among Analog Devices, Inc., products in that its input is an acoustic pressure wave. FOR this reason, some specifications included in the data sheets fOR these parts may not be familiar, OR familiar specifications may be applied in unfamiliar ways. This application note explains the specifica-tions and terms found in MEMS microphone data sheets so that the microphone can be appropriately designed into a system.
上传时间： 2013-10-31
上传用户：masochism
Abstract: The MAX9930–MAX9933 family of RF controllers and detectOR can be used in a wide variety of applications. Anideal application is cable television (CATV) over fiber, where either a RF controller OR a RF detectOR controls the gain of atransimpedance amplifier (TIA). This application note shows how the MAX9930 (RF controller) can be used as either theRF controller OR detectOR.
上传时间： 2013-10-11
上传用户：Pzj
Abstract: A laser module designer can use a fixed resistOR, mechanical pot, digital pot, OR a digital-to-analogconverter (DAC) to control the laser driver's modulation and bias currents. The advantages of a programmablemethod (POT OR DAC) are that the manufacturing process can be automated and digital control can be applied(e.g., to compensate fOR temperature). Using POTs can be a mORe simple approach than a DAC. There can be aslight cost advantage to using a POT, but this is usually not significant relative to other pieces of the design.Using a DAC can offer advantages, including improved linearity (translating to ease of software implementationand ability to hit the required accuracy), increased board density, a wider range of resolutions, a betteroptimization range, ease of use with a negative voltage laser driver, and unit-to-unit consistency
上传时间： 2013-11-13
上传用户：ca05991270
