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OUT1 -IN1 +IN1 Line Driver with Power-Down AD8019 CONFIGURAT
Top Searches for this datasheetFEATURES Distortion, High Output Current Amplifiers Operate from Power Supplies, Ideal High-Performance ADSL CPE, xDSL Modems Power Operation mA/Amp (Typ) Supply Current Digital (1-Bit) Power-Down Voltage Feedback Amplifiers Distortion Out-of-Band SFDR into Line High Speed Bandwidth dB), Slew Rate High Dynamic Range VOUT within Power Supply APPLICATIONS ADSL, VDSL, HDSL, Proprietary xDSL USB, PCI, PCMCIA Modems, Customer Premise Equipment (CPE) PRODUCT DESCRIPTION 8-Lead SOIC (R-8) OUT1 -IN1 +IN1 Line Driver with Power-Down AD8019 CONFIGURATIONS 14-Lead TSSOP (RU-14) OUT2 -IN2 +IN2 OUT1 -IN1 +IN1 PWDN AD8019AR AD8019ARU OUT2 -IN2 +IN2 DGND CONNECT AD8019 cost xDSL line driver optimized drive minimum into load while delivering outstanding distortion performance. AD8019 designed high-speed bipolar process enabling power supplies only. When operating from single supply highly efficient amplifier architecture typically deliver output current into impedance loads through turns ratio transformer. Hybrid designs using supplies enable turns ratio transformer, minimizing attenuation receive signal. AD8019 typically draws amplifier quiescent current. 1-bit digital power down feature reduces quiescent current approximately mA/amplifier. Figure shows typical Band SFDR performance under ADSL (upstream) conditions. SFDR measured while driving ADSL signal into line with back termination. AD8019 comes thermally enhanced 8-lead SOIC 14-lead TSSOP packages. 8-lead SOIC pin-compatible with AD8017 line driver. 10dB/DIV -80dBc 132.5 137.5 FREQUENCY 142.5 Figure Out-of-Band SFDR; Output Power into Upstream REV. Information furnished Analog Devices believed accurate reliable. However, responsibility assumed Analog Devices use, infringements patents other rights third parties that result from use. license granted implication otherwise under patent patent rights Analog Devices. Technology Way, P.O. 9106, Norwood, 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 Analog Devices, Inc., 2001 AD8019-SPECIFICATIONS otherwise noted.) Parameter DYNAMIC PERFORMANCE Bandwidth Conditions TMIN TMAX unless Unit V/µs Bandwidth Large Signal Bandwidth Slew Rate Rise Fall Time Settling Time NOISE/DISTORTION PERFORMANCE Distortion Second Harmonic Third Harmonic Out-of-Band SFDR MTPR Input Voltage Noise Input Current Noise Crosstalk PERFORMANCE Input Offset Voltage VOUT p-p, VOUT p-p, VOUT p-p, VOUT p-p, VOUT Noninverting, VOUT Noninverting, VOUT 0.1%, VOUT VOUT (Differential) kHz, RL(DM) kHz, RL(DM) kHz, RL(DM) kHz, RL(DM) kHz-1.1 MHz, Differential kHz-138 kHz, Differential MHz, -0.5 -0.2 +0.1 nV/Hz pAHz TMIN-TMAX Input Offset Voltage Match Open-Loop Gain INPUT CHARACTERISTICS Input Resistance Input Capacitance +Input Bias Current TMIN-TMAX -Input Bias Current TMIN-TMAX +Input Bias Current Match TMIN-TMAX -Input Bias Current Match CMRR Input Voltage Range OUTPUT CHARACTERISTICS Output Resistance Output Voltage Swing Output Current Short Circuit Current1 POWER SUPPLY Supply Current/Amp TMIN-TMAX TMIN-TMAX VOUT p-p, TMIN-TMAX -1.5 -1.8 -1.0 -1.5 -0.5 -0.8 +1.5 +1.8 +1.0 +1.5 +0.5 +0.8 SFDR into -4.8 +4.8 10.5 14.5 Operating Range Power Supply Rejection Ratio LOGIC LEVELS tOFF PWDN Voltage PWDN Voltage PWDN Bias Current PWDN Bias Current PWDN TMIN-TMAX PWDN Dual Supply +1.0 -1.0 VPWDN MHz, -100 NOTES This device protected from overheating during short-circuit thermal shutdown circuit. Specifications subject change without notice. REV. AD8019 Parameter DYNAMIC PERFORMANCE Bandwidth TMIN TMAX unless otherwise noted.) Conditions VOUT VOUT VOUT VOUT Noninverting, VOUT Noninverting, VOUT 0.1%, VOUT VOUT (Differential) kHz, RL(DM) kHz, RL(DM) kHz, RL(DM) kHz, RL(DM) kHz-500 kHz, Differential kHz-138 kHz, Differential MHz, Unit V/µs Bandwidth Large Signal Bandwidth Slew Rate Rise Fall Time Settling Time NOISE/DISTORTION PERFORMANCE Distortion Second Harmonic Third Harmonic Out-of-Band SFDR MTPR Input Voltage Noise Input Current Noise Crosstalk PERFORMANCE Input Offset Voltage -0.5 -0.2 +0.2 +0.1 nV/Hz pAHz TMIN-TMAX Input Offset Voltage Match Open-Loop Gain INPUT CHARACTERISTICS Input Resistance Input Capacitance +Input Bias Current TMIN-TMAX -Input Bias Current TMIN-TMAX +Input Bias Current Match TMIN-TMAX -Input Bias Current Match CMRR Input Voltage Range OUTPUT CHARACTERISTICS Output Resistance Output Voltage Swing Output Current Short Circuit Current1 POWER SUPPLY Supply Current/Amp TMIN-TMAX TMIN-TMAX VOUT p-p, TMIN-TMAX -3.8 -1.5 -1.7 -1.0 -2.4 -1.0 -2.5 +3.8 +1.5 +1.7 +1.0 +2.4 +1.0 +2.5 SFDR into -10.8 +10.8 11.5 1.75 Operating Range Power Supply Rejection Ratio LOGIC LEVELS tOFF PWDN Voltage PWDN Voltage PWDN Bias Current PWDN Bias Current PWDN High TMIN-TMAX PWDN Dual Supply +1.0 -1.0 VPWDN MHz, -100 NOTES This device protected from overheating during short-circuit thermal shutdown circuit. Specifications subject change without notice. REV. AD8019 ABSOLUTE MAXIMUM RATINGS MAXIMUM POWER DISSIPATION Supply Voltage 26.4 Internal Power Dissipation TSSOP-14 Package2 SOIC-8 Package3 Input Voltage (Common-Mode) Differential Input Voltage Output Short Circuit Duration Observe Power Derating Curves Storage Temperature Range -65°C +125°C Operating Temperature Range -40°C +85°C Lead Temperature Range (Soldering sec) 300°C NOTES Stresses above those listed under Absolute Maximum Ratings cause permanent damage device. This stress rating only; functional operation device these other conditions above those indicated operational section this specification implied. Exposure absolute maximum rating conditions extended periods affect device reliability. Specification device four-layer board with inches copper 85°C 14-lead TSSOP package: 90°C/W. Specification device four-layer board with inches copper 85°C 8-lead SOIC package: 100°C/W. maximum power that safely dissipated AD8019 limited associated rise junction temperature. maximum safe junction temperature plastic encapsulated device determined glass transition temperature plastic, approximately 150°C. Temporarily exceeding this limit cause shift parametric performance change stresses exerted package. output stage AD8019 designed maximum load current capability. result, shorting output common cause AD8019 source sink ensure proper operation, necessary observe maximum power derating curves. Direct connection output either power supply rail destroy device. MAXIMUM POWER DISSIPATION TSSOP SOIC AMBIENT TEMPERATURE Figure Plot Maximum Power Dissipation Temperature AD8019 ORDERING GUIDE Model AD8019ARU AD8019ARU-Reel AD8019ARU-EVAL AD8019AR AD8019AR-Reel AD8019AR-EVAL Temperature Range -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C Package Description 14-Lead TSSOP 14-Lead TSSOP Evaluation Board 8-Lead SOIC 8-Lead SOIC Evaluation Board Package Option RU-14 RU-14 Reel ARU-EVAL Reel EVAL CAUTION (electrostatic discharge) sensitive device. Electrostatic charges high 4000 readily accumulate human body test equipment discharge without detection. Although AD8019 features proprietary protection circuitry, permanent damage occur devices subjected high-energy electrostatic discharges. Therefore, proper precautions recommended avoid performance degradation loss functionality. WARNING! SENSITIVE DEVICE REV. Typical Performance Characteristics-AD8019 49.9 VOUT +VIN -VIN Single-Ended Test Circuit; Differential Test Circuit; VOUT VOLTS -100 -100 TIME -100 -100 TIME 100ns/DIV Step Response; Single-Ended Step Response; Single-Ended VOUT Volts VOUT Volts -100 -100 TIME TIME Step Response; Single-Ended Step Response; Single-Ended REV. AD8019 DISTORTION DISTORTION -100 0.01 FREQUENCY -100 0.01 FREQUENCY Distortion Frequency; Differential, Distortion Frequency; Differential, HARMONIC HARMONIC DISTORTION DISTORTION -100 -100 PEAK OUTPUT CURRENT DIFFERENTIAL OUTPUT VOLTAGE Distortion Peak Output Current; kHz; Single-Ended; Second Harmonic Distortion Output Voltage; kHz, +10, Differential DISTORTION DISTORTION HARMONIC HARMONIC -100 -110 -100 PEAK OUTPUT CURRENT DIFFERENTIAL OUTPUT VOLTAGE Distortion Peak Output Current; kHz; Single-Ended; Second Harmonic Distortion Output Voltage; kHz, +10, Differential REV. AD8019 OUTPUT VOLTAGE DISTORTION -100 DIFFERENTIAL OUTPUT VOLTAGE 1000 FREQUENCY Distortion Output Voltage; kHz, +10, Differential Output Voltage Frequency; DISTORTION CMRR 0.01 VOUT -100 -110 DIFFERENTIAL OUTPUT VOLTAGE FREQUENCY 1000 Distortion Output Voltage; kHz, +10, Differential CMRR Frequency; OUTPUT SATURATION VOLTAGE Volts OUTPUT VOLTAGE 1000 FREQUENCY 1000 LOAD CURRENT Output Saturation Voltage Load; Output Voltage Frequency; REV. AD8019 0.01 +PSRR -PSRR CROSSTALK PSRR FREQUENCY 1000 -100 0.01 FREQUENCY 1000 PSRR Frequency; Crosstalk Frequency, PHASE Degrees VNOISE +INOISE GAIN PHASE VNOISE INOISE -INOISE 1000 0.01 FREQUENCY 1000 0.001 0.01 FREQUENCY Noise Frequency Open-Loop Gain Phase Frequency 0.1% 2mV/DIV 2mV/DIV 0.1% VOUT VOUT 6.8pF 1.1k 1.1k VOUT 6.8pF 1.1k 1.1k VOUT 20ns/DIV 20ns/DIV Settling Time 0.1%; VOUT Settling Time 0.1%; VOUT REV. AD8019 1000 VOUT 1V/DIV VOUT 2V/DIV OUTPUT IMPEDANCE 0.01 0.001 0.01 FREQUENCY -200 TIME 1200 1600 Output Impedance Frequency; Overload Recovery; VOUT 2V/DIV VOUT 5V/DIV VOUT 1V/DIV VOUT 2V/DIV -100 TIME -200 TIME 1200 1600 Overload Recovery; =100 Overload Recovery; VOUT 2V/DIV VOUT 5V/DIV -100 TIME Overload Recovery; REV. AD8019 13dBm MTPR SFDR 11dBm 12dBm 13dBm 11dBm 12dBm 10dBm 10dBm TURNS RATIO TURNS RATIO MTPR Turns Ratio; Line SFDR Turns Ratio; Line 18dBm 18dBm 17dBm MTPR 17dBm 16dBm 13dBm SFDR 16dBm 13dBm TURNS RATIO TURNS RATIO MTPR Turns Ratio; Line SFDR Turns Ratio; Line -10- REV. AD8019 GENERAL INFORMATION AD8019 voltage feedback amplifier with high output current capability. voltage feedback amplifier, AD8019 features lower current noise more applications flexibility than current feedback designs. fabricated Analog Devices' proprietary High Voltage eXtra Fast Complementary Bipolar Process (XFCB-HV), which enables construction transistors with similar region. process dielectrically isolated eliminate parasitic latch-up problems caused junction isolation. These features enable construction high-frequency, low-distortion amplifiers. POWER-DOWN FEATURE Figure Simplified Differential Driver digitally programmable logic (PWDN) available TSSOP-14 package. allows user select between operating conditions, full shutdown. DGND logic reference. threshold PWDN typically above DGND. power-down feature being used, better DGND lowest potential that AD8019 tied place PWDN potential least higher than that DGND pin, lower than positive supply voltage. POWER SUPPLY DECOUPLING Remembering that each output device only dissipates half time gives simple integral that computes power each device: total supply power then computed PTOT POUT AD8019 powered with good quality (i.e., low-noise) supply anywhere range from order optimize ADSL upstream drive capability maintain best Spurious Free Dynamic Range (SFDR), AD8019 circuit should powered with well-regulated supply. Careful attention must paid decoupling power supply. High quality capacitors with equivalent series resistance (ESR) such multilayer ceramic capacitors (MLCCs) should used minimize supply voltage ripple power dissipation. addition, MLCC decoupling capacitors should located more than inch away from each power supply pins. large, usually tantalum, capacitor required provide good decoupling lower frequency signals supply current fast, large signal changes AD8019 outputs. POWER DISSIPATION this differential driver, voltage output amplifier, voltage across total impedance seen differential driver, including back termination. Now, with observations integrals easily evaluated. First, integral simply square value Second, integral equal average rectified value sometimes called mean average deviation, MAD. shown that signal, value equal times value. PTOT (0.8 rms2 POUT AD8019 operating single supply delivering total line matching network) into 17.3 (100 reflected back through 1:1.7 transformer plus back termination), dissipated power Using these calculations 90°C/W TSSOP package 100°C/W SOIC, Tables I-IV show junction temperature versus power delivered line several supply voltages while operating with ambient temperature 85°C. shaded areas indicate operation junction temperature over absolute maximum rating 150°C, should avoided. Table Junction Temperature Line Power Operating Voltage TSSOP important consider total power dissipation AD8019 order properly size heat sink area application. Figure simple representation differential driver. With some simplifying assumptions estimate total power dissipated this circuit. output current large compared quiescent current, computing dissipation output devices adding quiescent power dissipation will give close approximation total power dissipation package. factor (~0.6-1) corrects slight error Class operation output stage. estimated subtracting quiescent current output stage from total quiescent current ratioing that total quiescent current. AD8019, 0.833. PLINE, VSUPPLY 12.5 REV. -11- AD8019 Table Junction Temperature Line Power Operating Voltage SOIC VSUPPLY PLINE, 12.5 energy make circuit less susceptible interference. Adherence stripline design techniques long signal traces (greater than about inch) recommended. Evaluation Board AD8019 available installed evaluation board both package styles. Figures show schematics TSSOP evaluation board. receiver circuit these boards typically unpopulated. Requesting samples AD8022AR, along with either AD8019 evaluation boards, will provide capability evaluate AD8019 along with other Analog Devices products typical transceiver circuit. evaluation circuits have been designed replicate side analog transceiver hybrid circuits. circuit mentioned above designed using 1-transformer transceiver topology including line receiver, line driver, line matching network, RJ11 jack interfacing line simulators, differential inputs. AC-coupling capacitors C10, combination with resistors R25, will form order highpass pole Transformer Selection Table III. Junction Temperature Line Power Operating Voltage TSSOP VSUPPLY PLINE, Table Junction Temperature Line Power Operating Voltage SOIC VSUPPLY PLINE, Thermal stitching, which connects outer layers internal ground plane(s), help utilize thermal mass draw heat away from line driver other active components. LAYOUT CONSIDERATIONS Customer premise ADSL requires transmission signal. signal crest factor 5.3, requiring line driver provide peak line power peak line power translates into peak voltage telephone line. Assuming that maximum distortion output swing available from AD8019 line driver supply taking into account power lost termination resistance, step-up transformer with turns ratio adequate most applications. modem designer desires transmit more than down twisted pair, higher turns ratio used transformer. This trade-off comes expense higher power dissipation line driver well increased attenuation downstream signal that received transceiver. simplified differential drive circuit shown Figure AD8019 coupled phone line through step-up transformer with turns ratio. back termination line matching resistors, each (100 12)) where approximate phone line impedance. transformer reflects impedance from line side side value inversely proportional square turns ratio. total differential load AD8019, including termination resistors, Even under these conditions AD8019 provides distortion signals within power supply rails. must take care minimize capacitance present outputs line driver. sources such capacitance include, limited suppression capacitors, overvoltage protection devices transformers used hybrid. Transformers have kinds parasitic capacitances, distributed, bulk capacitance, interwinding capacitance. Distributed capacitance result capacitance created between each adjacent winding transformer. Interwinding capacitance capacitance that exists between windings primary secondary sides transformer. existence these capacitances unavoidable, specifying case with high-speed applications, careful attention printed circuit board layout details will prevent associated board parasitics from becoming problematic. Proper design technique mandatory. should have ground plane covering unused portions component side board provide low-impedance return path. Removing ground plane layers from areas near input output pins will reduce stray capacitance, particularly area inverting inputs. signal routing should short direct order minimize parasitic inductance capacitance associated with these traces. Termination resistors loads should located close possible their respective inputs outputs. Input output traces should kept apart possible minimize coupling (crosstalk) though board. Wherever there complementary signals, symmetrical layout should provided extent possible maximize balanced performance. When running differential signals over long distance, traces should close together differential wiring should twisted together minimize area loop that formed. This will reduce radiated -12- REV. AD8019 transformer, should minimize them order avoid operating line driver potentially unstable environment. Limiting both distributed interwinding capacitance less than each should sufficient most applications. Stability Enhancements from other subbands, regardless whether corruption comes from adjacent subband harmonics other subbands. Conventional methods expressing output signal integrity line drivers such single tone harmonic distortion THD, two-tone Intermodulation Distortion (IMD) third order intercept (IP3) become significantly less meaningful when amplifiers required process other heavily modulated waveforms. typical ADSL upstream signal contain many carriers (subbands tones) signals. Multi-Tone Power Ratio (MTPR) relative difference between measured power typical subband tone carrier) versus power another subband specifically selected contain data. other words, selected subband tone) remains open void intentional power (without signal) yielding empty frequency bin. MTPR, sometimes referred `empty test,' typically expressed dBc, similar expressing relative difference between single tone fundamentals second third harmonic distortion components. Measurements MTPR typically made line side secondary side transformer. Voltage feedback amplifiers exhibit sensitivity capacitance present inverting input. Parasitic capacitance, small several picofarads, combination with high-impedance input create pole that dramatically decrease phase margin amplifier. case AD8019, compensation capacitor pF-20 parallel with feedback resistor will form zero that serve cancel effects parasitic capacitance. Placing series with each noninverting inputs serves isolate inputs from each other from high frequency signals that coupled into amplifier midsupply bias. also necessary configure line driver separate, noninverting amplifiers rather than single differential driver. When doing this, gain resistors share coupling capacitor minimize errors. Adhering previously mentioned layout techniques will also assistance keeping amplifier stable. Receive Channel Considerations transformer used output differential line driver step differential output voltage line inverse effect signals received from line. voltage reduction attenuation equal inverse turns ratio realized receive channel typical bridge hybrid. turns ratio transformer also dictated ability receive circuitry resolve low-level signals noisy twisted pair telephone plant. While higher turns ratio transformers boost transmit signals appropriate level, they also effectively reduce received signal noise ratio reduction received signal strength. Using transformer with turns ratio possible will limit degradation received signal. AD8022, dual amplifier with typical voltage noise only nV/Hz supply current mA/amplifier recommended receive channel. Modulation, Multi-Tone Power Ratio (MTPR) Out-of-Band SFDR POWER FREQUENCY Figure Waveform Frequency Domain ADSL systems rely Discrete Multi-Tone DMT) modulation carry digital data over phone lines. modulation appears frequency domain power contained several individual frequency subbands, sometimes referred tones bins, each which uniformly separated frequency. uniquely encoded, Quadrature Amplitude Modulation (QAM)like signal occurs center frequency each subband tone. Figure example waveform frequency domain, Figure time domain waveform. Difficulties will exist when decoding these subbands signal from subband corrupted signal(s) MTPR versus transformer turns ratio depicted TPCs covers variety line power ranging from dBm. turns ratio increases, driver hybrid deliver more undistorted power load high output current capability AD8019. Significant degradation MTPR will occur output driver swings rails, causing clipping voltage peaks. Driving signals such extremes only compromises band" MTPR, will also produce spurs that exist outside frequency spectrum containing transmitted signal. "Outof-band" spurious free dynamic range (SFDR) defined relative difference amplitude between these spurs tone upstream bins. Compromising out-of-band SFDR equivalent increasing near-end cross talk (NEXT). Regardless terminology, maintaining out-of-band SFDR while reducing NEXT will improve overall performance modems connected either twisted pair. REV. -13- AD8019 Generating Signals this time, DMT-modulated waveforms typically menu-selectable items contained within arbitrary waveform generators. Even using (AWG) software generate signals, AWGs that available today deliver signals sufficient performance with regard MTPR limitations converters output drivers used manufacturers. Similar evaluating single-tone distortion performance amplifier, MTPR evaluation requires signal generator capable delivering MTPR performance better than that driver under evaluation. Generating signals accomplished using Tektronics 2021 equipped with Option (12-/24-bit, Digital Data Out), digitally coupled Analog Devices' AD9754, 14-bit TxDAC®, buffered AD8002 amplifier configured differential driver. Note that waveforms, available Analog Devices website, www.analog.com, similar. files needed produce necessary digital data required drive TxDAC from optional Digital Data output AWG2021. +12V VOLTS -0.25 -0.20 -0.15 -0.10 -0.05 TIME 0.05 0.10 0.15 0.20 Figure Signal Time Domain POUT 16dBm 17.3 LINE POWER 13dBm 17.3 1:1.7 TRANSFORMER Figure Recommended Application Circuit Single Supply +12V -12V POUT 16dBm 12.4 LINE POWER 13dBm 12.4 TRANSFORMER Figure Recommended Application Circuit Supply TxDAC registered trademark Analog Devices, Inc. -14- REV. REV. TP10 AD8019 TP23 TP24 *DNI INSTALL VCC-2 BEAD VCCIN BEAD TP19 TP25 TP26 VCC;8 VEE;4 TP17 AD8022 AD8019 1WATT VCC-2 TP11 Figure TSSOP Noninverting Evaluation Board Schematic -15- TP18 AD8022 VCC;8 VEE;4 0.01 DECOUPLING TP12 DECOUPLING VCC-2 DECOUPLING DECOUPLING AD8019 AD8019 PWDN DGND AD8019 Figure Driver Input Control Circuit Figure TSSOP Evaluation Board Silkscreen Bottom AGND AGND Figure TSSOP Evaluation Board Silkscreen Figure TSSOP Evaluation Board Power Plane -16- REV. AD8019 Figure Solder Mask Figure Ground Plane Bottom Figure Solder Mask Bottom Figure Assembly REV. -17- AD8019 Figure Ground Plane Figure Assembly Bottom -18- REV. AD8019 Figure Board Fabrication REV. -19- AD8019 OUTLINE DIMENSIONS Dimensions shown inches (mm). 14-Lead TSSOP (RU-14) C02551-1.5-4/01(0) 0.028 (0.70) 0.020 (0.50) 0.201 (5.10) 0.193 (4.90) 0.177 (4.50) 0.169 (4.30) 0.256 (6.50) 0.246 (6.25) 0.006 (0.15) 0.002 (0.05) 0.0433 (1.10) SEATING PLANE 0.0256 (0.65) 0.0118 (0.30) 0.0075 (0.19) 0.0079 (0.20) 0.0035 (0.090) 8-Lead SOIC (R-8) 0.1968 (5.00) 0.1890 (4.80) 0.1574 (4.00) 0.1497 (3.80) 0.2440 (6.20) 0.2284 (5.80) 0.0500 (1.27) 0.0098 (0.25) 0.0040 (0.10) SEATING PLANE 0.102 (2.59) 0.094 (2.39) 0.0192 (0.49) 0.0138 (0.35) 0.0098 (0.25) 0.0075 (0.19) 0.0196 (0.50) 0.0099 (0.25) 0.0500 (1.27) 0.0160 (0.41) -20- REV. PRINTED U.S.A. 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