AD724

RGB to NTSC/PAL Encoder

PRODUCTDESCRIPTION TheAD724isalowcostRGBtoNTSC/PALEncoderthatconvertsred,greenandbluecolorcomponentsignalsintotheircorrespondingluminance(basebandamplitude)andchrominance(subcarrieramplitudeandphase)signalsinaccordancewitheitherNTSCorPALstandards. FEA

AD724

RGB轉NTSC/PAL編碼器; ? 低成本集成解決方案\n\n? +5 V電源供電\n\n? 接受FSC時鐘、晶振或4 FSC時鐘\n\n? 只需極少的外部元件:\n無需外部濾波器或延遲線\n片上直流箝位\n接受HSYNC與VSYNC或CSYNC\n\n? 復合視頻和獨立Y/C（S-視頻）輸出\n\n? 亮度和色度輸出具有時序一致性\n\n? 相位鎖定至外部副載波\n\n? 驅動75 Ω反向端接負載\n\n? 邏輯可選的NTSC或PAL編碼模式\n\n? 緊湊的16引腳SOIC封裝;

AD724是一款低成本RGB轉NTSC/PAL編碼器，可將紅色、綠色和藍色分量信號轉換為符合NTSC或PAL標準的相應亮度（基帶振幅）和色度（副載波振幅與相位）信號。同時，這兩路輸出合并以提供復合視頻輸出。所有三路輸出可以同時驅動75 Ω、反向端接電纜。所有邏輯輸入均為CMOS兼容型。該芯片采用+5 V單電源供電；無需外部延遲線或濾波器。不使用時，該器件可以關斷。AD724接受FSC或4FSC時鐘。當無時鐘可用時，一個低成本并行諧振晶體（3.58 MHz (NTSC)或4.43 MHz (PAL)）與該器件的片內振蕩器一起可產生必要的副載波時鐘。AD724還接受外部視頻源提供的副載波時鐘。與圖形控制器的接口十分簡單：片內邏輯“XNOR”接受可用的垂直同步(VSYNC)和水平同步(HSYNC)信號，并在片內生成復合同步(CSYNC)信號。如果可用，AD724也能接受標準CSYNC信號，方法是將VSYNC與+5 V相連，并將CSYNC施加于HSYNC引腳。該器件內置解碼邏輯，可識別有效的水平同步脈沖，以便正確插入突發(fā)脈沖。U和V兩種色度濾波器的延遲由Y信號路徑中的片內采樣數(shù)據(jù)延遲線匹配。為防止混疊，該延遲線之前接一個5 MHz前置濾波器，之后接一個5 MHz后置濾波器，以便抑制輸出中的諧波。這些低通濾波器經(jīng)過優(yōu)化，脈沖過沖極小。整體亮度延遲相對于色度具有時序一致性，可直接輸入電視基帶中。AD724采用節(jié)省空間的SOIC封裝，額定溫度范圍為0°C至+70°C商用溫度范圍。本產品可提供評估板，訂購型號為：AD724-EB。

AD7242

CMOS, Dual, Complete 12-Bit Serial DACPORT TM;

The AD7242/AD7244 is a fast, complete, dual 12-bit/14-bit voltage output D/A converter. It consists of a 12-bit/14-bit DAC, 3 V buried Zener reference, DAC output amplifiers and high speed serial interface logic.Interfacing to both DACs is serial, minimizing pin count and allowing a small package size. Standard control signals allow interfacing to most DSP processors and microcontrollers. Asynchronous control of DAC updating for both DACs is made possible with a separate LDAC input for each DAC.The AD7242/AD7244 operates from ±5 V power supplies, providing an analog output range of ±3 V. A REF OUT/REF IN function allows the DACs to be driven from the on-chip 3 V reference or from an external reference source.The AD7242/AD7244 is fabricated in Linear Compatible CMOS (LC2MOS), an advanced mixed technology process that combines precision bipolar circuits with low power CMOS logic. Both parts are available in a 24-pin, 0.3-inch wide, plastic or hermetic dual-in-line package (DIP) and in a 28-pin, plastic small outline (SOIC) package. The AD7242 and AD7244 are available in the same pinout to allow easy upgrade from 12-bit to 14-bit performance.\n\n

AD7242

LC2MOS Dual, Complete, 12-Bit/14-Bit Serial DACs

GENERALDESCRIPTION TheAD7242/AD7244isafast,complete,dual12-bit/14-bitvoltageoutputD/Aconverter.Itconsistsofa12-bit/14-bitDAC,3VburiedZenerreference,DACoutputamplifiersandhighspeedserialinterfacelogic. FEATURES Two12-Bit/14-BitDACswithOutputAmplifiers

AD7242

LC2MOS Dual, Complete, 12-Bit/14-Bit Serial DACs

GENERALDESCRIPTION TheAD7242/AD7244isafast,complete,dual12-bit/14-bitvoltageoutputD/Aconverter.Itconsistsofa12-bit/14-bitDAC,3VburiedZenerreference,DACoutputamplifiersandhighspeedserialinterfacelogic. FEATURES Two12-Bit/14-BitDACswithOutputAmplifiers

AD7242AQ

LC2MOS Dual, Complete, 12-Bit/14-Bit Serial DACs

GENERALDESCRIPTION TheAD7242/AD7244isafast,complete,dual12-bit/14-bitvoltageoutputD/Aconverter.Itconsistsofa12-bit/14-bitDAC,3VburiedZenerreference,DACoutputamplifiersandhighspeedserialinterfacelogic. FEATURES Two12-Bit/14-BitDACswithOutputAmplifiers

AD7242AQ

LC2MOS Dual, Complete, 12-Bit/14-Bit Serial DACs

GENERALDESCRIPTION TheAD7242/AD7244isafast,complete,dual12-bit/14-bitvoltageoutputD/Aconverter.Itconsistsofa12-bit/14-bitDAC,3VburiedZenerreference,DACoutputamplifiersandhighspeedserialinterfacelogic. FEATURES Two12-Bit/14-BitDACswithOutputAmplifiers

AD7242BQ

LC2MOS Dual, Complete, 12-Bit/14-Bit Serial DACs

GENERALDESCRIPTION TheAD7242/AD7244isafast,complete,dual12-bit/14-bitvoltageoutputD/Aconverter.Itconsistsofa12-bit/14-bitDAC,3VburiedZenerreference,DACoutputamplifiersandhighspeedserialinterfacelogic. FEATURES Two12-Bit/14-BitDACswithOutputAmplifiers

AD7242BQ

LC2MOS Dual, Complete, 12-Bit/14-Bit Serial DACs

GENERALDESCRIPTION TheAD7242/AD7244isafast,complete,dual12-bit/14-bitvoltageoutputD/Aconverter.Itconsistsofa12-bit/14-bitDAC,3VburiedZenerreference,DACoutputamplifiersandhighspeedserialinterfacelogic. FEATURES Two12-Bit/14-BitDACswithOutputAmplifiers

AD7242JN

LC2MOS Dual, Complete, 12-Bit/14-Bit Serial DACs

GENERALDESCRIPTION TheAD7242/AD7244isafast,complete,dual12-bit/14-bitvoltageoutputD/Aconverter.Itconsistsofa12-bit/14-bitDAC,3VburiedZenerreference,DACoutputamplifiersandhighspeedserialinterfacelogic. FEATURES Two12-Bit/14-BitDACswithOutputAmplifiers