音視頻及家電
電子發(fā)燒友網(wǎng)本頻道提供專業(yè)的視頻技術(shù)文章和音響技術(shù)應(yīng)用資料等;是值得收藏和分享的視頻技術(shù)與音頻技術(shù)欄目。
MAX9217/MAX9218視頻鏈路中的音頻數(shù)據(jù)傳輸
摘要：MAX9217/MAX9218串行器和解串器芯片組通過一對(duì)兒雙絞線LVDS鏈路實(shí)現(xiàn)視頻數(shù)據(jù)傳輸，廣泛用于汽車和工業(yè)應(yīng)用領(lǐng)域。視頻信號(hào)的每一幀總是存在消隱周期，可以利用這些周期“承...
2009-05-03 標(biāo)簽： 1169
信號(hào)帶寬與信道帶寬
信號(hào)帶寬與信道帶寬 信號(hào)帶寬是信號(hào)頻譜的寬度，也就是信號(hào)的最高頻率分量與最低頻率分量之差，譬如，一個(gè)由數(shù)個(gè)正弦波疊加成的方波信號(hào)，其最低頻率分量是其基頻...
2009-05-02 標(biāo)簽：帶寬 4829
利用眼圖模板評(píng)估串行器和解串器(SerDes)的性能
摘要：Maxim開發(fā)了一系列串行器和解串器，廣泛用于視頻顯示和數(shù)字圖像系統(tǒng)中的高速、串行數(shù)據(jù)互聯(lián)。目前，設(shè)計(jì)人員急需找到一種測(cè)試由串行器和解串器(SerDes)芯片組搭建的串行...
2009-05-02 標(biāo)簽：串行器 2931
顯示器提供背光的高亮度發(fā)光二極管和SEPIC電源模塊-Dis
Abstract: In automotive applications, offering a wide dimming ratio for backlights is important because the display panel must be viewable in both direct sunlight and in complete darkness. The latest high-brightness (HB) LEDs offer a backl...
參考設(shè)計(jì)采用MAX15026為輔助電源的液晶電視或機(jī)頂盒-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 標(biāo)簽：MAX15026 1258
自動(dòng)電平控制(ALC)為揚(yáng)聲器提供有效保護(hù)
摘要：在筆記本電腦和便攜DVD應(yīng)用中，音頻系統(tǒng)存在一個(gè)問題，即揚(yáng)聲器的動(dòng)態(tài)范圍有限，無法滿足實(shí)際應(yīng)用的要求。由于受產(chǎn)品尺寸的制約，揚(yáng)聲器的尺寸非常小，只能在有限的...
優(yōu)化緩沖放大器/ADC的連接
摘要：隨著接收機(jī)數(shù)字化程度的提高，模擬信號(hào)至數(shù)字域的轉(zhuǎn)換成為提高通信設(shè)備動(dòng)態(tài)性能的關(guān)鍵。本文詳細(xì)討論了為通信設(shè)備選擇適當(dāng)?shù)男盘?hào)調(diào)理及轉(zhuǎn)換器件時(shí)需要考慮的關(guān)鍵參...
2009-04-29 標(biāo)簽：adc 1131
白光LED驅(qū)動(dòng)器提供64級(jí)對(duì)數(shù)調(diào)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 標(biāo)簽：led 957
LCD對(duì)比度控制的半導(dǎo)體數(shù)字電位器-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 ...
使用DS1050可編程PWMs控制直流電動(dòng)機(jī)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 標(biāo)簽：led電動(dòng)機(jī) 1158
總線的I/O擴(kuò)展器控制LCD偏置電壓
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...
LCD電視背光照明中的設(shè)計(jì)挑戰(zhàn)
摘要：LCD (液晶顯示器)是電控發(fā)光管，LCD TV (液晶顯示電視)采用白光作為“背光”，通常使用冷陰極熒光燈(CCFL)為彩色熒光屏照明。其它技術(shù)，如：發(fā)光二極管(LED), 也作為一種考慮...
2009-04-28 標(biāo)簽：lcd 933
順序啟動(dòng)CCFL顯示器的突發(fā)亮度調(diào)節(jié)
摘要：為了降低對(duì)直流逆變器瞬間電流的需求，DS3984/DS3988冷陰極熒光燈控制器采用順序啟動(dòng)突發(fā)亮度調(diào)節(jié)的方式，控制LCD顯示器的每個(gè)通道。 圖1給出了DS3984/DS3988冷陰...
2009-04-28 標(biāo)簽：顯示器 1033
DS3984/DS3988多燈驅(qū)動(dòng)方案
摘要：DS3984和DS3988是多通道冷陰極熒光燈(CCFL)控制器。DS3984支持多達(dá)四通道，DS3988支持八通道。這些控制器使用推挽式驅(qū)動(dòng)架構(gòu)，可將DC電源電壓轉(zhuǎn)換成為驅(qū)動(dòng)CCFL所需的高壓AC波形。...
用DS39xx CCFL控制器實(shí)現(xiàn)模擬調(diào)光
摘要：DS3881、DS3882、DS3984、DS3988、DS3991、DS3992和DS3994是冷陰極熒光燈(CCFL)背光液晶顯示器(LCD)控制器。為了取得滿意的視覺效果或延長(zhǎng)燈泡壽命，在大多數(shù)應(yīng)用中需要進(jìn)行亮度調(diào)節(jié)。...
2009-04-28 標(biāo)簽：控制器 1508
增強(qiáng)DS39x系列CCFL控制器的柵極驅(qū)動(dòng)能力
摘要：DS3984、DS3988、DS3991、DS3992以及DS3994是冷陰極熒光燈管(CCFL)的控制器，用于液晶顯示LCD的背光。每個(gè)控制器通道可以驅(qū)動(dòng)兩個(gè)邏輯電平MOSFET以轉(zhuǎn)換直流電壓到CCFL驅(qū)動(dòng)所需要的高...
雙極性控制數(shù)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 標(biāo)簽：雙極性 1205
使用DS1802按鈕數(shù)字電位器創(chuàng)建音頻放大器與衰減-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 標(biāo)簽：音頻放大 2219
音頻增益控制用數(shù)字電位器-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 標(biāo)簽：音頻 1694
用線性數(shù)字電位器實(shí)現(xiàn)對(duì)數(shù)調(diào)節(jié)
摘要：數(shù)字電位器(數(shù)字可變電阻或digipot)常常用于音量控制。音頻系統(tǒng)中，音量衰減應(yīng)遵循人耳的響應(yīng)特性，按照對(duì)數(shù)規(guī)律變化。在一些設(shè)計(jì)中，會(huì)使用簡(jiǎn)單的低成本線性電位器取...
2009-04-28 標(biāo)簽： 923
在音頻衰減器電路中使用MAXQ3210
摘要：本應(yīng)用筆記介紹一種可自動(dòng)實(shí)現(xiàn)立體聲音頻衰減器的系統(tǒng)。MAXQ3210低功耗16位RISC微控制器是系統(tǒng)控制器，它產(chǎn)生各種時(shí)序間隔，驅(qū)動(dòng)音頻信號(hào)逐漸衰減，以靜音狀態(tài)結(jié)束。使用...
EPOT應(yīng)用：偏移調(diào)整的運(yùn)算放大器電路
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...
EPOT應(yīng)用：增益調(diào)整的運(yùn)算放大器電路
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 標(biāo)簽：放大器 1147
在音頻衰減器電路中使用MAXQ3210
摘要：本應(yīng)用筆記介紹一種可自動(dòng)實(shí)現(xiàn)立體聲音頻衰減器的系統(tǒng)。MAXQ3210低功耗16位RISC微控制器是系統(tǒng)控制器，它產(chǎn)生各種時(shí)序間隔，驅(qū)動(dòng)音頻信號(hào)逐漸衰減，以靜音狀態(tài)結(jié)束。使用...
2009-04-28 標(biāo)簽：音頻 5517
用數(shù)字電位器替代機(jī)械電位器
摘要：數(shù)字可調(diào)節(jié)電位器，也稱為數(shù)字電位器或digpot，不僅能夠在眾所周知的音頻應(yīng)用中替代機(jī)械電位器，而且能夠在所有電子設(shè)備中替代傳統(tǒng)的機(jī)械電位器。作為模/數(shù)轉(zhuǎn)換器(DAC)...
2009-04-28 標(biāo)簽：機(jī)械電位 2080
低壓差線性穩(wěn)壓改善白光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 標(biāo)簽：led 823
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 標(biāo)簽：Powers 1867
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