音视频及家电
电子发烧友网本频道提供专业的视频技术文章和音响技术应用资料等;是值得收藏和分享的视频技术与音频技术栏目。
参考设计采用MAX15026为辅助电源的液晶电视或机顶盒-R
Abstract: This application note shows a reference design using the MAX15026 low-cost, high-efficiency synchronous buck converter in an auxiliary power supply for LCD TVs or set-top boxes. This reference design generates a 5V, 5A power supp...
2009-05-02 1252
自动电平控制(ALC)为扬声器提供有效保护
摘要：在笔记本电脑和便携DVD应用中，音频系统存在一个问题，即扬声器的动态范围有限，无法满足实际应用的要求。由于受产品尺寸的制约，扬声器的尺寸非常小，只能在有限的...
2009-04-29 3427
优化缓冲放大器/ADC的连接
摘要：随着接收机数字化程度的提高，模拟信号至数字域的转换成为提高通信设备动态性能的关键。本文详细讨论了为通信设备选择适当的信号调理及转换器件时需要考虑的关键参...
2009-04-29 1123
白光LED驱动器提供64级对数调光-White-LED Dr
Abstract: This circuit drives as many as four white LEDs in parallel from a 3.3V source, and adjusts the total LED current from 1mA to 106mA, in 64 steps of 1dB each. The circuit of Figure 1 is designed for portable-power...
2009-04-28 941
LCD对比度控制的半导体数字电位器-LCD Contrast
Abstract: Manufacturers of portable equipment, workstations, small handheld computers, cell phones, and video games use flat panel displays to display text and images. Electro-mechanical potentiometers have been the typical mechanism used ...
2009-04-28 2064
使用DS1050可编程PWMs控制直流电动机和LED背光液晶
Abstract: The DS1050 is a 5-bit pulse-width modulator (PWM) controlled by a 2-wire bus. This allows a single master device to control up to 8 slave (DS1050 and other 2-wire devices) on a single 2-wire bus. In this application note, an inte...
2009-04-28 1146
总线的I/O扩展器控制LCD偏置电压
Abstract: A circuit consisting of an SMBus™ I/O expander, step-up converter, and digital potentiometer enables the SMBus to control the contrast of an LCD. Small, handheld, battery-powered devices often feature an L...
2009-04-28 1381
LCD电视背光照明中的设计挑战
摘要：LCD (液晶显示器)是电控发光管，LCD TV (液晶显示电视)采用白光作为“背光”，通常使用冷阴极荧光灯(CCFL)为彩色荧光屏照明。其它技术，如：发光二极管(LED), 也作为一种考虑...
2009-04-28 928
顺序启动CCFL显示器的突发亮度调节
摘要：为了降低对直流逆变器瞬间电流的需求，DS3984/DS3988冷阴极荧光灯控制器采用顺序启动突发亮度调节的方式，控制LCD显示器的每个通道。 图1给出了DS3984/DS3988冷阴...
2009-04-28 1027
DS3984/DS3988多灯驱动方案
摘要：DS3984和DS3988是多通道冷阴极荧光灯(CCFL)控制器。DS3984支持多达四通道，DS3988支持八通道。这些控制器使用推挽式驱动架构，可将DC电源电压转换成为驱动CCFL所需的高压AC波形。...
2009-04-28 1482
用DS39xx CCFL控制器实现模拟调光
摘要：DS3881、DS3882、DS3984、DS3988、DS3991、DS3992和DS3994是冷阴极荧光灯(CCFL)背光液晶显示器(LCD)控制器。为了取得满意的视觉效果或延长灯泡寿命，在大多数应用中需要进行亮度调节。...
2009-04-28 1505
增强DS39x系列CCFL控制器的栅极驱动能力
摘要：DS3984、DS3988、DS3991、DS3992以及DS3994是冷阴极荧光灯管(CCFL)的控制器，用于液晶显示LCD的背光。每个控制器通道可以驱动两个逻辑电平MOSFET以转换直流电压到CCFL驱动所需要的高...
2009-04-28 1447
双极性控制数字放大器-Dual-Polarity Ampli
Abstract: This application note discusses using digital potentiometers for gain control in traditional operational amplifier (op amp) circuits. Examples are given for typical op amp configurations (inverting, non-inverting) where the digit...
2009-04-28 1195
使用DS1802按钮数字电位器创建音频放大器与衰减-Usin
Abstract: The DS1802 audio potentiometer contains two digitally controlled potentiometers and features a logarithmic taper that produces a 1dB change per increment. This application note describes using it in a push-button controlled audio...
2009-04-28 2216
音频增益控制用数字电位器-Audio Gain Contro
Abstract: Digital potentiometers (pots) offer advantages in volume control applications over bulky mechanical pots, especially in handheld portable devices such as MP3 players, PDAs, cell phones, or stereo AM/FM radios. This document descr...
2009-04-28 1686
用线性数字电位器实现对数调节
摘要：数字电位器(数字可变电阻或digipot)常常用于音量控制。音频系统中，音量衰减应遵循人耳的响应特性，按照对数规律变化。在一些设计中，会使用简单的低成本线性电位器取...
2009-04-28 920
在音频衰减器电路中使用MAXQ3210
摘要：本应用笔记介绍一种可自动实现立体声音频衰减器的系统。MAXQ3210低功耗16位RISC微控制器是系统控制器，它产生各种时序间隔，驱动音频信号逐渐衰减，以静音状态结束。使用...
2009-04-28 1437
EPOT应用：偏移调整的运算放大器电路
Abstract: In some electronic systems, a DC offset voltage at the inputs will contribute a significant error to the output. This is especially true in high gain configurations. An offset adjustment circuit can be added to "null" out the off...
2009-04-28 2269
EPOT应用：增益调整的运算放大器电路
Variable gain amplifiers often use a mechanical potentiometer to set the gain. An example is a volume control dial. However, when the analog signal path is digitally controlled, a digital potentiometer might be used to control gain. This a...
2009-04-28 1138
在音频衰减器电路中使用MAXQ3210
摘要：本应用笔记介绍一种可自动实现立体声音频衰减器的系统。MAXQ3210低功耗16位RISC微控制器是系统控制器，它产生各种时序间隔，驱动音频信号逐渐衰减，以静音状态结束。使用...
2009-04-28 5506
用数字电位器替代机械电位器
摘要：数字可调节电位器，也称为数字电位器或digpot，不仅能够在众所周知的音频应用中替代机械电位器，而且能够在所有电子设备中替代传统的机械电位器。作为模/数转换器(DAC)...
2009-04-28 2075
低压差线性稳压改善白光LED的亮度匹配-LDO Linear
Abstract: A simple, traditional method of powering white light-emitting-diodes (LEDs) with fixed bias voltage and ballast resistors result in poor brightness matching between LEDs. This is due to wide LED forward voltage variation, sometim...
2009-04-27 814
Buck/Boost Charge-Pump Regulat
Abstract: The MAX1759 step-up/step-down charge-pump regulator is used to power white LEDs with constant current by clever use of a feedback network. The 1x/2x modes of the charge pump provides high efficiency, especially in two-cell NiMH a...
2009-04-27 1853
串联或并联白光LED的供电方案：电荷泵与升压型DC-DC转换
摘要：白光LED被普遍用作便携设备LCD的背光源，原因是他们复杂程度较低、花费较少且尺寸小于CCFL背光源。PDA、手机和数码相机等便携设备已逐步过渡到彩色LCD显示屏，因此，越来...
2009-04-27 2575
结构紧凑，无电感升压电路调节白光LED偏置电流-Compac
Abstract: This article shows how to use the MAX1759 buck/boost charge pump to power white LEDs for display backlighting in portable applications. The increasing use of color LCDs in hand-held equipment is creating a need ...
2009-04-27 1426
混合电路驱动器的类型和数量的LED-Circuit Driv
Portable systems often use LEDs of different colors-white for the display backlight, green for keypad illumination, red for power, etc., and in varying quantities of each. Typically the LEDs are driven by at least two power supplies, one f...
2009-04-27 940
单管控制第二LED阵列在开关模式LED背灯-Single F
White-LED backlights are gaining acceptance because they offer higher reliability and simpler drive circuitry than those based on CCFL and EL technology. As a result, the white-LED backlight is increasingly common in PDAs, cell-phones, dig...
2009-04-27 1039
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