yuanquan_100的专栏

“程控7灯单片机”实践案例“程控7灯单片机”实践案例“程控7灯单片机”实践案例“程控7灯单片机”实践案例

M4562是美国国家半导体公司全新推出的超低失真、低噪声、高转换速率运算放大器系列中的一员，该系列完全针对高性能、高保真的应用。通过采用最尖端的工艺技术和最新的电路设计方法，LM4562音频运放可提供出色的音频信号放大功能。该运放拥有极低的电压噪声密度(2.7nV/Hz1/2)和THD+N(0.00003%)，以及极高的增益带宽积(55MHz)可轻松满足最苛刻的音频应用需求。为了确保能顺利驱动最难应对的负载，LM4562具有±20V/us的高转换速率和±30mA的电流输出能力。此外，输出级驱动2kΩ负载所需的电源电压不到1V，而驱动600Ω负载所需的电源电压不到1.4V，可使动态范围最大

P0上拉电阻- - 在数字电路中不用的输入脚都要接固定电平，通过1k电阻接高电平或接地。 1. 电阻作用： l 接电组就是为了防止输入端悬空 l 减弱外部电流对芯片产生的干扰 l 保护cmos内的保护二极管,一般电流不大于10mA l 上拉和下拉、限流 l 1. 改变电平的电位，常用在TTL-CMOS匹配 2. 在引脚悬空时有确定的状态 3.增加高电平输出时的驱动能力。 4、为OC门提供电流

FEATURES “Linear in dB” Gain Control Pin Programmable Gain Ranges –11 dB to +31 dB with 90 MHz Bandwidth +9 dB to +51 dB with 9 MHz Bandwidth Any Intermediate Range, e.g., –1 dB to +41 dB with 30 MHz Bandwidth Bandwidth Independent of Variable Gain 1.3 nV/ÖHz Input Noise Spectral Density 60.5 dB Typical Gain Accuracy MIL-STD-883 Compliant and DESC Versions Available APPLICATIONS RF/IF AGC Amplifier Video Gain Control A/D Range Extension Signal Measurement Low Noise, 90 MHz Variable-Gain Amplifier PRODUCT DESCRIPTION

TDA8922 2 ´ 25 W class-D power amplifier 1 FEATURES · High efficiency (~90%) · Operating supply voltage from ±12.5 to ±30 V · Very low quiescent current · Low distortion · Usable as a stereo Single-Ended (SE) amplifier or as a mono amplifier in Bridge-Tied Load (BTL) · Fixed gain of 30 dB in Single-Ended (SE) and 36 dB in Bridge-Tied Load (BTL) · High output power · Good

The MAX038 is a high-frequency, precision function generator producing accurate, high-frequency triangle, sawtooth, sine, square, and pulse waveforms with a minimum of external components. The output frequency can be controlled over a frequency range of 0.1Hz to 20MHz by an internal 2.5V bandgap voltage reference and an external resistor and capacitor. The duty cycle can be varied over a wide range by applying a ±2.3V control signal, facilitating pulse-width modulation and the generation of sawtooth waveforms. Frequency modulation and frequency sweeping are achieved in the same way. The duty cycle and frequency controls are independent. Sine, square, or triangle waveforms can be selected

..SUPPLY VOLTAGEDOWN TO 3 V .LOWCROSSOVER DISTORSION .LOWQUIESCENT CURRENT BRIDGE OR STEREO CONFIGURATION DESCRIPTION The TDA2822 is a monolithic integrated circuit in 12+2+2 powerdip, intended for use as dual audio power amplifier in portable radios and TS sets.

ADC0808/ADC0809 8-Bit μP Compatible A/D Converters with 8-Channel Multiplexer General Description The ADC0808, ADC0809 data acquisition component is a monolithic CMOS device with an 8-bit analog-to-digital converter, 8-channel multiplexer and microprocessor compatible control logic. The 8-bit A/D converter uses successive approximation as the conversion technique. The converter features a high impedance chopper stabilized comparator, a 256R voltage divider with analog switch tree and a successive approximation register. The 8-channel multiplexer can directly access any of 8-single-ended analog signals. The device eliminates the need for external zero and full-scale adjustments. Easy interfacing to microprocessors is provided by the latched and decoded multiplexer address

3-TERMINAL 1A POSITIVE VOLTAGE REGULATOR DESCRIPTION The UTC 78XX family is monolithic fixed voltage regulator integrated circuit. They are suitable for applications that required supply current up to 1 A. FEATURES *Output current up to 1.5 A *Fixed output voltage of 5V, 6V, 8V, 9V, 10V, 12V, 15V ,18V and 24V available *Thermal overload shutdown protection *Short circuit current limiting *Output transistor SOA protection

n OUTPUT CURRENT UP TO 1.5 A n OUTPUT VOLTAGESOF 5; 5.2; 6; 8; 8.5; 9; 12; 15; 18; 24V n THERMAL OVERLOAD PROTECTION n SHORTCIRCUIT PROTECTION n OUTPUT TRANSITION SOA PROTECTION

8-BIT SERIAL-INPUT, DMOS POWER DRIVER The A6B595KA and A6B595KLW combine an 8-bit CMOS shift register and accompanying data latches, control circuitry, and DMOS power driver outputs. Power driver applications include relays, solenoids, and other medium-current or high-voltage peripheral power loads. The serial-data input, CMOS shift register and latches allow direct interfacing with microprocessor-based systems. Serial-data input rates are over 5 MHz. Use with TTL may require appropriate pull-up resistors to ensure an input logic high

800mA Low Dropout Voltage Regulator SPX1117 DESCRIPTION FEATURES ■ Guaranteed 0.8A Output Current ■ Guaranteed 1A Peak Current ■ Three Terminal Adjustable or Fixed 1.5V, 1.8V, 2.5V, 2.85V, 3.0V, 3.3V and 5V ■ Low Quiescent Current ■ Low Dropout Voltage of 1.1V at 0.8A ■ 0.1% Line and 0.2% Load Regulation ■ Stable with 2.2uF Ceramic Capacitor ■ Overcurrent and Thermal Protection ■ Lead Free, RoHS Compliant Packages: SOT-223,TO-252, TO-220, and TO-263 The SPX1117 is a low power positive-voltage regulator designed to satisfy moderate power requirements with a cost effective, small footprint solution. This device is an excellent choice for use in battery-powered applications and portable computers. The SPX1117 features very low quiescent current and a low dropout voltage of 1.1V at a full load. As output current decreases, quiescent current flows into the load, increasing efficiency. SPX1117 is available in adjustable or fixed 1.5V, 1.8V, 2.5V,2.5V, 2.85V, 3.0V, 3.3V and 5V output voltages. The SPX1117 is offered in several 3-pin surface mount packages: SOT-223, TO-252, TO-220 and TO-263. An output capacitor of 10μF provides unconditional stability while a smaller 2.2μF capacitor is sufficient for most applications. APPLICATIONS ■ Desktop PC's Servers ■ SCSI-II Active Terminator ■ Portable/ Palm Top / Notebook Computers ■ Cordless Phones ■ Battery Chargers ■ Disk Drives ■ Portable Consumer Equipment ■ Portable Instrumentation ■ SMPS Post-Regulator

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2 x 12 W hi-fi audio power amplifier TDA1521 TDA1521Q GENERAL DESCRIPTION The TDA1521/TDA1521Q is a dual hi-fi audio power amplifier encapsulated in a 9-lead plastic power package. The device is especially designed for mains fed applications (e.g. stereo tv sound and stereo radio). Features · Requires very few external components · Input muted during power-on and off (no switch-on or switch-off clicks) · Low offset voltage between output and ground · Excellent gain balance between channels · Hi-fi according to IEC 268 and DIN 45500 · Short-circuit-proof · Thermally protected

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产品特性 • 高性能、低功耗的 8 位AVR® 微处理器 • 先进的RISC 结构 – 131 条指令 – 大多数指令执行时间为单个时钟周期 – 32个8 位通用工作寄存器 – 全静态工作 – 工作于16 MHz 时性能高达16 MIPS – 只需两个时钟周期的硬件乘法器 • 非易失性程序和数据存储器 – 16K 字节的系统内可编程Flash 擦写寿命: 10,000 次 – 具有独立锁定位的可选Boot 代码区 通过片上Boot 程序实现系统内编程 真正的同时读写操作 – 512 字节的EEPROM 擦写寿命: 100,000 次 – 1K字节的片内SRAM – 可以对锁定位进行编程以

2009年全国大学生电子设计竞赛试题 参赛注意事项 （1）2009年9月2日8:00竞赛正式开始。本科组参赛队只能在【本科组】题目中任选一题；高职高专组参赛队在【高职高专组】题目中任选一题，也可以选择【本科组】题目。 （2）参赛队认真填写《登记表》内容，填写好的《登记表》交赛场巡视员暂时保存。 （3）参赛者必须是有正式学籍的全日制在校本、专科学生，应出示能够证明参赛者学生身份的有效证件（如学生证）随时备查。 （4）每队严格限制3人，开赛后不得中途更换队员。 （5）参赛队必须在学校指定的竞赛场地内进行独立设计和制作，不得以任何方式与他人交流，包括教师在内的非参赛队员必须迴避，对违纪参赛队取消评审资格。 （6）2009年9月5日20:00竞赛结束，上交设计报告、制作实物及《登记表》，由专人封存。

CodeVisionAVR C Compiler Reference CodeVisionAVR C 编译器参考 翻译自CodeVisionAVR C Compiler Help 目录 1. Comments － 注释 2. Reserved Keywords － 关键字 3. Identifiers － 标识符 4. Data Types － 数据类型 5. Constants － 常量 6. Variables － 变量

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