模数转换器外文翻译

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1、 外文资料翻译 The 10-bit CMOS ADC (Analog to Digital Converter) is a recycling type device with 8-channel analog inputs. It converts the analog input signal into 10-bit binary codes at a maximum conversion rate of 500KSPS with 205MHZ A/D converter clock. A/D converter operates with on-chip sample-and-hold

2、 function and power down node is supported. The LCD controller in the S3C2440 consists of the logic for transferring LCD image data from a video buffer located in system memory to an external LCD driver. The LCD controller supports monochrome,2-bit per pixel(4-level gray scale) or 4-bit per pixel (1

3、6-level gray scale) mode on a monochrome LCD,using a time-based dithering algorithm and Frame Rate Control (FRC) method and it can be interfaced with a color LCD panel at 8-bit per pixel (256-level color) and 12-bit per pixel (4096-level color) for interfacing with STN LCD. The LCD controller can be

4、 programmed to support different requirements on the screen related to the number of horizontal and vertical pixels, data line width for the data interface, interface timing and refresh rate. FEATURES TFT LCD Displays: Supports 1,2,4 or 8-bpp (bit per pixel) palletized color displays for TFT Support

5、s 16,24-bpp non-palletized true-color displays for color TFT Supports maximum 16M color TFT at 24bit per pixel mode Supports multiple screen size Typical actual screen size: 640 * 480 , 320 * 240 , 160 * 160 , and others Maximum virtual screen size is 4Mbytes Maximum virtual screen size in 64K color

6、 mode : 2048*1024 and others A/D converter classification： 1. The integral type (such as TLC7135) Integral type AD work principle is the input voltage will convert time (pulse width signal) or frequency (pulse frequency), and then by the timer/counter get digital value. Its advantage is to use a sim

7、ple circuit can get high resolution, but shortcomings due to a conversion precision dependent on integral time, so the conversion rate is extremely low. At the early stage of the monolithic AD converter is used mostly integral type, now compare successive type has gradually become the mainstream. 2.

8、 Compare two successive type (such as TLC0831) Successive type AD by a comparison is used and DA converter through successive more logical structure, from the MSB began, in order to every will input voltage and built-in DA converter output carries on the comparison, the n times comparison and the nu

9、merical value of output. The circuit of the scale to belong to medium. Its advantage is high speed, low power consumption, low resolution ( twelve) price is very high. 3. Parallel comparison of type/parallel comparison type (such as TLC5510) Parallel comparison with multiple comparator type AD, only

10、 for a comparison of the conversion, also called flash (fast) type. Due to the conversion rate is extremely high, n a conversion to need 2 n-a comparator and, therefore, the size of a circuit, the price is high, only applies to the video AD converter, particularly high speed of the field. String of

11、parallel comparison between parallel structure type AD on the type and successive comparison between type, the most typical is by 2 n/two parallel type AD converter with DA converter component, with two times the better implement conversion, so called Half flash (Half a fast) type. And into three st

12、eps or more steps called AD transform realize classification (Multistep/Subrangling) type AD, and from a conversion timing Angle can also be called as the assembly line (Pipelined) type AD and modern classification type in AD joining in the many transformations number operations and fixed the charac

13、teristics of the function. This kind of AD faster than successive type is high, circuit scale than parallel type small. 4. - modulated (such as AD7705) - type AD by integrator, comparator, a DA converter and digital filters etc. In principle similar to integral type, the input voltage conversion to

14、time (pulse width) signal, a digital filter to get digital value after the treatment. The digital circuit of the single chip basically easily, so easy to do high resolution. Mainly used for audio and measurement. 5. Capacitance array is successive type Capacitance array type compare successive AD de

15、velops in the built-in DA converter capacitance matrix way, can also be called charge FenPeiXing again. The general resistor DA converters most resistance value must be consistent, in a single chip generate high precision of the resistor is not easy. If use capacitance array replace resistor, can be

16、 made with low cost high precision monolithic AD converter. Recent successive type AD converter is mostly for the capacitance array type. Pressure frequency conversion type (such as AD650) Pressure Frequency conversion model (Voltage-Frequency Converter) is through the indirect conversion way realiz

17、ation of conversion module. Its principle is first the input analog signal conversion into frequency, then use the counter will frequency converted into digital quantity. In theory this AD resolution can be almost unlimited increase, as long as the sampling time can meet the requirements of the outp

18、ut pulse frequency resolution cumulative number of width. Its advantage is high resolution, low power consumption, low price, but need to external counts circuit to complete the AD transform. ARM9E-S as an example to introduce the main ARM9 processor structure and characteristics. Its main character

19、istics as follows: (1) 32 bit fixed-point RISC processors, improved ARM/Thumb code interweave, enhance sexual on time-multiplier design. Support real-time (real-time) commissioning； (2) in the SRAM of instructions and data, and instructions and data storage capacity of adjustable； (3) in high speed

20、of instructions and data buffers (cache) from 4 K bytes capacity to 1 M bytes)； (4) set protection unit (protection unit), very suitable for embedded application segment and memory protection； (5) the AMBA AHB bus interface for peripherals to provide a uniform address and data bus； (6) support exter

21、nal coprocessor, instructions and data bus have simple handshake signaling support； (7) support standard basic logic unit http:/ scanning test methodology, and support BIST (built-in-self-test)； (8) support embedded tracking macro unit, support real-time tracking instructions and data. 中文资料翻译 10 位 C

22、MOS ADC （模数转换器 ）是一个 8 通道模拟输入的再循环类型设备。器转换模拟输入信号为 10 位二进制数字编码，最大转换率为 2.5MHZ A/D 转换器时钟下的 500KSPS。 A/D 转换器支持片上采样 保持功能和掉电 模式的操作 。 S3C2440中的 LCD控制器由从位于系统存储器的视频帧缓冲区到外部 LCD驱动器的转移 LCD 图像数据逻辑组成。 LCD 控制器支持单色 LCD 的单色。 2 位每像素（ 4 阶灰度 ）或 4 位每像素（ 16 阶灰度）模式，通过使用 基于时间的抖动算法和帧频控制（ FRC）方法，其可以连接到 8 位没像素（ 256 色）的彩色 LCD 面板和连接到 12 位每像素（ 4096 色 ）的 STN LCD.