MC14528BFELG中文资料

Rev. DDocument Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However , noresponsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Speci cations subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. T rademarks and registered trademarks are the property of their respective owners.One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2011–2013 Analog Devices, Inc. All rights reserved. Technical Support 引脚接线图NIC 1–IN 2+IN 3V–4NIC 8V+7OUT 6NIC5NOTES1. NIC = NO INTERNAL CONNECTION.ADA4528-1TOP VIEW (Not to Scale)09437-001图1. ADA4528-1引脚配置(8引脚MSOP)09437-102ADA4528-1TOP VIEW (Not to Scale)3+IN –V 41NIC 2–IN 6OUT 5NIC8NIC7V+NOTES1. NIC = NO INTERNAL CONNECTION.2. CONNECT THE EXPOSED PAD TO V– OR LEAVE IT UNCONNECTED.图2. ADA4528-1引脚配置(8引脚LFCSP)1101001101001k 10k 100k 1M 10MV O L T A G E N O I S E D E N S I T Y (n V /√H z )FREQUENCY (Hz)09437-063V SY = 5V V CM = V SY /2A V = 1图3. 电压噪声密度与频率的关系表1. ADI 公司零漂移运算放大器产品组合 1类型 超低噪声微功耗(<20 μA)低功耗(<1 mA) 16 V工作电压30 V 工作电压单通道 ADA4528-1 ADA4051-1 AD8628 AD8638 ADA4638-1AD8538双通道 ADA4528-2 ADA4051-2 AD8629 AD8639AD8539 四通道AD86301欲选择最新的零漂移运算放大器，请访问 。

S5558/N5558description/ordering informationThe MC1458 and MC1558 are dual general-purpose operational amplifiers, with each half electrically similar to the μA741, except that offset null capability is not provided.The high-common-mode input voltage range and the absence of latch-up make these amplifiers ideal for voltage-follower applications. The devices are short-circuit protected and the internal frequency compensation ensures stability without external components.ORDERING INFORMATIONT AV IO max AT 25°CPACKAGE †ORDERABLE PART NUMBER TOP-SIDE MARKING PDIP (P)Tube MC1458P MC1458P Tube MC1458D 0°C to 70°C6 mVSOIC (D)Tape and reel MC1458DR MC1458SOP (PS)Tape and reel MC1458PSR M1458CDIP (JG)Tube MC1558JG MC1558JG −°°CDIP (JGB)Tube MC1558JGB MC1558JGB 55C to 125C5 mV LCCC (FK)TubeMC1558FKMC1558FK†Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at /sc/package.PRODUCTION DATA information is current as of publication date.3212019910111213456781817161514NC 2OUT NC 2IN −NCNC 1IN −NC 1IN+NCMC1558...FK PACKAGEN C 1O U T N C N CN CN CV N C NC − No internal connectionC C +V 2I N +C C −(TOP VIEW)MC1458, MC1558DUAL GENERAL-PURPOSE OPERATIONAL AMPLIFIERSsymbol (each amplifier)−+IN+OUTIN −schematic (each amplifier)IN −IN +OUT V CC +V CC−MC1458, MC1558DUAL GENERAL-PURPOSE OPERATIONAL AMPLIFIERSSLOS069C − FEBRUARY 1971 − REVISED AUGUST 2010absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†Supply voltage, V CC+ (see Note 1):MC1458 18 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MC1558 22 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Supply voltage, V CC − (see Note 1):MC1458 −18 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MC1558 −22 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Differential input voltage, V ID (see Note 2) ±30 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Input voltage, V I (either input, see Notes 1 and 3) ±15 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Duration of output short circuit (see Note 4) Unlimited. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Operating virtual junction temperature, T J 150°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Package thermal impedance, θJA (see Notes 5 and 6):D package 97°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . P package 85°C/W . . . . . . . . . . . . . . . . . . . . . . . . . . . . PS package 95°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . Package thermal impedance, θJC (see Notes 7 and 8):FK package 5.61°C/W. . . . . . . . . . . . . . . . . . . . . . . . . JG package 14.5°C/W. . . . . . . . . . . . . . . . . . . . . . . . . Case temperature for 60 seconds: FK package 260°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: JG package 300°C . . . . . . . . . . . . . . . . . . . . Lead temperature 1,6 mm (1/16 inch) from case for 60 seconds: D, P , or PS package 260°C . . . . . . . . . . . . . Storage temperature range, T stg −65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . †Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.NOTES: 1.All voltage values, unless otherwise noted, are with respect to the midpoint between V CC+ and V CC −.2.Differential voltages are at IN+ with respect to IN −.3.The magnitude of the input voltage must never exceed the magnitude of the supply voltage or 15 V, whichever is less.4.The output can be shorted to ground or either power supply. For the MC1558 only, the unlimited duration of the short circuit appliesat (or below) 125°C case temperature or 70°C free-air temperature.5.Maximum power dissipation is a function of T J (max), θJA , and T A . The maximum allowable power dissipation at any allowableambient temperature is P D = (T J (max) − T A )/θJA . Operating at the absolute maximum T J of 150°C can affect reliability.6.The package thermal impedance is calculated in accordance with JESD 51-7.7.Maximum power dissipation is a function of T J (max), θJC , and T C . The maximum allowable power dissipation at any allowable casetemperature is P D = (T J (max) − T C )/θJC . Operating at the absolute maximum T J of 150°C can affect reliability.8.The package thermal impedance is calculated in accordance with MIL-STD-883.recommended operating conditionsMINMAX UNIT V CC ±Supply voltage±5±15V Operating free air temperature range MC1458070T AOperating free-air temperature rangeMC1558−55125°CMC1458, MC1558DUAL GENERAL-PURPOSE OPERATIONAL AMPLIFIERSSLOS069C − FEBRUARY 1971 − REVISED AUGUST 2010electrical characteristics at specified free-air temperature, V CC ± = ±15 VTEST CONDITIONS MC1458MC1558PARAMETER†MINTYP MAXMINTYP MAXUNIT 025°C 1615V IO Input offset voltage V O = 0Full range 7.56mV V 025°C 2020020200I IO Input offset current O = 0Full range 300500nA 025°C 8050080500I IB Input bias current V O = 0Full range 8001500nA Common-mode input 25°C ±12±13±12±13V ICRCommon mode input voltage rangeFull range ±12±12VR L = 10 k Ω25°C ±12±14±12±14Maximum peak output R L ≥ 10 k ΩFull range ±12±11V OMvoltage swingR L = 2 k Ω25°C ±10±13±10±13VR L ≥ 2 k ΩFull range ±10±10Large-signal differential ≥ 2 k ΩV 25°C 2020050200A VD Large signal differential voltage amplification R L ,O = ±10 V Full range 1525V/mV B OM Maximum-output-swing bandwidth (closed loop)R L = 2 k Ω,V O ≥ ±10 V,A VD = 1,THD ≥ 5%25°C 1414kHz B 1Unity-gain bandwidth 25°C 11MHz φmPhase margin A VD = 125°C 6565deg Gain margin25°C 1111dB r i Input resistance 25°C 0.320.3*2M Ωr o Output resistance V O = 0,See Note 925°C 7575ΩC i Input capacitance 25°C 1.4 1.4pF z ic Common-mode input impedance f = 20 Hz 25°C 200200M ΩCommon-mode V 25°C 70907090CMRRCommon mode rejection ratio IC = V ICR min, V O = 0Full range 7070dBSupply-voltage V 25°C 3015030150k SVS sensitivity (ΔV IO /ΔV CC )CC = ±9 V to ±15 V,V O = 0Full range 150150μV/V V n Equivalent input noise voltage (closed loop)A VD = 100,R S = 0,f = 1 kHz,BW = 1 Hz25°C 4545nV/√Hz I OS Short-circuit output current25°C ±25±40±25±40mA Supply current 0No load 25°C 3.45.6 3.45I CC (both amplifiers)V O = 0,No load Full range 6.6 6.6mA Total power dissipation 0No load25°C 100170100150P D (both amplifiers)V O = 0,No load Full range 200200mW V O1/V O2Crosstalk attenuation25°C120120dB*On products compliant to MIL-PRF-38535, this parameter is not production tested.†All characteristics are specified under open-loop operating conditions with zero common-mode input voltage, unless otherwise specified. Full range for MC1458 is 0°C to 70°C and for MC1558 is −55°C to 125°C.NOTE 9:This typical value applies only at frequencies above a few hundred hertz because of the effect of drift and thermal feedback.MC1458, MC1558DUAL GENERAL-PURPOSE OPERATIONAL AMPLIFIERSSLOS069C − FEBRUARY 1971 − REVISED AUGUST 2010operating characteristics, V CC ± = ±15 V, C L = 100 pF, T A = 25°C (see Figure 1)MC1458MC1558PARAMETERTEST CONDITIONSMINTYP MAXMINTYP MAXUNIT Rise time V I = 20 mV,R L = 2 k Ω,0.30.3μs t r Overshoot factor V I = 20 mV,R L = 2 k Ω55%SRSlew rate at unity gainV I = 10 V,R L = 2 k Ω0.50.5V/μs+−V I0 VInputOutputR L = 2 k ΩC L = 100 pFTest CircuitInput Voltage WaveformFigure 1. Rise-Time, Overshoot, and Slew-Rate Waveform and Test CircuitAddendum-Page 1PACKAGING INFORMATIONOrderable Device Status(1)Package Type PackageDrawingPins Package QtyEco Plan(2)Lead/Ball Finish MSL Peak Temp (3)Samples (Requires Login)5962-9760301Q2A ACTIVE LCCC FK 201TBD Call TI Call TI 5962-9760301QPAACTIVE CDIP JG 81TBDCall TICall TIMC1458D ACTIVE SOIC D 875Green (RoHS & no Sb/Br)CU NIPDAU Level-1-260C-UNLIM MC1458DE4ACTIVE SOIC D 875Green (RoHS & no Sb/Br)CU NIPDAU Level-1-260C-UNLIM MC1458DG4ACTIVE SOIC D 875Green (RoHS & no Sb/Br)CU NIPDAU Level-1-260C-UNLIM MC1458DR ACTIVE SOIC D 82500Green (RoHS & no Sb/Br)CU NIPDAU Level-1-260C-UNLIM MC1458DRE4ACTIVE SOIC D 82500Green (RoHS & no Sb/Br)CU NIPDAU Level-1-260C-UNLIM MC1458DRG4ACTIVE SOIC D 82500Green (RoHS & no Sb/Br)CU NIPDAU Level-1-260C-UNLIM MC1458P ACTIVE PDIP P 850Pb-Free (RoHS)CU NIPDAU N / A for Pkg Type MC1458PE4ACTIVE PDIP P 850Pb-Free (RoHS)CU NIPDAU N / A for Pkg Type MC1458PSR ACTIVE SO PS 82000Green (RoHS & no Sb/Br)CU NIPDAU Level-1-260C-UNLIM MC1458PSRE4ACTIVE SO PS 82000Green (RoHS & no Sb/Br)CU NIPDAU Level-1-260C-UNLIM MC1458PSRG4ACTIVE SO PS 82000Green (RoHS & no Sb/Br)CU NIPDAU Level-1-260C-UNLIM MC1558FKB ACTIVE LCCC FK 201TBD POST-PLATE N / A for Pkg TypeMC1558JG ACTIVE CDIP JG 81TBD A42N / A for Pkg Type MC1558JGB ACTIVE CDIP JG 81TBD A42N / A for Pkg Type MC1558P OBSOLETE PDIP P 8TBD Call TI Call TI SN98212POBSOLETEPDIPP8TBDCall TICall TI(1)The marketing status values are defined as follows:ACTIVE: Product device recommended for new designs.LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.PREVIEW: Device has been announced but is not in production. Samples may or may not be available.OBSOLETE: TI has discontinued the production of the device.芯天下--/(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check /productcontent for the latest availability information and additional product content details.TBD: The Pb-Free/Green conversion plan has not been defined.Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.OTHER QUALIFIED VERSIONS OF MC1558, MC1558M :•Catalog: MC1558•Military: MC1558MNOTE: Qualified Version Definitions:•Catalog - TI's standard catalog product•Military - QML certified for Military and Defense ApplicationsAddendum-Page 2芯天下--/TAPE AND REEL INFORMATION*All dimensions are nominalDevicePackage Type Package Drawing Pins SPQReel Diameter (mm)Reel Width W1(mm)A0(mm)B0(mm)K0(mm)P1(mm)W (mm)Pin1Quadrant MC1458DR SOIC D 82500330.012.4 6.4 5.2 2.18.012.0Q1MC1458DR SOIC D 82500330.012.4 6.4 5.2 2.18.012.0Q1MC1458PSRSOPS82000330.016.48.26.62.512.016.0Q1*All dimensions are nominalDevice Package Type Package Drawing Pins SPQ Length(mm)Width(mm)Height(mm) MC1458DR SOIC D8*******.0367.035.0 MC1458DR SOIC D8*******.5338.120.6MC1458PSR SO PS82000367.0367.038.0IMPORTANT NOTICETexas Instruments Incorporated and its subsidiaries(TI)reserve the right to make corrections,enhancements,improvements and other changes to its semiconductor products and services per JESD46C and to discontinue any product or service per JESD48B.Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.All semiconductor products(also referred to herein as“components”)are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment.TI warrants performance of its components to the specifications applicable at the time of sale,in accordance with the warranty in TI’s terms and conditions of sale of semiconductor products.Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty.Except where mandated by applicable law,testing of all parameters of each component is not necessarily performed.TI assumes no liability for applications assistance or the design of Buyers’products.Buyers are responsible for their products and applications using TI components.To minimize the risks associated with Buyers’products and applications,Buyers should provide adequate design and operating safeguards.TI does not warrant or represent that any license,either express or implied,is granted under any patent right,copyright,mask work right,or other intellectual property right relating to any combination,machine,or process in which TI components or services are rmation published by TI regarding third-party products or services does not constitute a license to use such products or services or a warranty or endorsement e of such information may require a license from a third party under the patents or other intellectual property of the third party,or a license from TI under the patents or other intellectual property of TI.Reproduction of significant portions of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties,conditions,limitations,and notices.TI is not responsible or liable for such altered rmation of third parties may be subject to additional restrictions.Resale of TI components or services with statements different from or beyond the parameters stated by TI for that component or service voids all express and any implied warranties for the associated TI component or service and is an unfair and deceptive business practice. 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自适应差值脉冲编码(ADPCM)芯片MC14550一、典型参数1、单一供电方式：2.7V～5.25V2、低功耗：5V时,150mW 功耗下降0.3mW3V时,65mW 功耗下降0.2mW3、低噪声：有差分模拟电路。

4、u律/A律压扩PCM编译码/滤波器电路5、三种速率选择(32、24、16kbit/s)、四种算法ADPCM CODEC完全满足G721、723、726和G714的PCM性能。

6、通用可编程双音频发生器。

7、可编程,发送增益调整,接收增益调整与侧音增益调整。

8、可直接与话简接口的低噪声,高增益的三端输入运算放大器电路。

9、可直接与与扬声器接口,推挽300Ω负载阻抗。

10、可提供振铃接口的推挽300Ω的驱动电路。

11、可提供降功耗方式,3V电源输入数字信号处理电路5V电源输入模拟信号处理电路12、在接收端具有噪声突发检测算法13、有串行控制口和监控内存,可实现微计算机控制二、引脚图三、逻辑图四、管脚功能简介第1引脚(TG－Ｔransmit Gain)：发送增量控制。

由第2引脚（TI-）和第3引脚（TI+）输入的音频模拟信号经输入运放后从该端输出。

该端实质上是发送滤波器的输入端。

这是设定运算放大器发送增益的输出和输入到发送带通滤波器。

此运算放大器能驱动2K Ω负载到V AG引脚。

当TI_和TI+连到V DD时,TG运算放大器掉电,TG引脚变成高阻抗,输入到发送放大器。

此引脚上的所有信号以V AG引脚为基准。

当器件是在模拟掉电方式下时,此引脚是高阻抗。

此运算放大器由V DD引脚加电。

第2引脚(TI_Transmit Analog Inverting Input)：模拟运算放大器反相输入端。

音频模拟信号通过该端进入模拟运放。

这是发送增益设定运算放大器的反相输入。

增益设定电阻通常从此引脚连到TG和从此引脚到模拟信号源。

TI+和TI_引脚的工模范围从1．0V到－２V。

连接此引脚和TI+(引脚3)到V DD 将置此放大器的输出(TG)于高阻抗状态,这样,允许TG引脚作为发送滤波器的高阻抗输入。

元器件交易网IMPORTANT NOTICETexas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinueany product or service without notice, and advise customers to obtain the latest version of relevant informationto verify, before placing orders, that information being relied on is current and complete. All products are soldsubject to the terms and conditions of sale supplied at the time of order acknowledgement, including thosepertaining to warranty, patent infringement, and limitation of liability.TI warrants performance of its semiconductor products to the specifications applicable at the time of sale inaccordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extentTI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarilyperformed, except those mandated by government requirements.CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OFDEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICALAPPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, ORWARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHERCRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TOBE FULLY AT THE CUSTOMER’S RISK.In order to minimize risks associated with the customer’s applications, adequate design and operatingsafeguards must be provided by the customer to minimize inherent or procedural hazards.TI assumes no liability for applications assistance or customer product design. TI does not warrant or representthat any license, either express or implied, is granted under any patent right, copyright, mask work right, or otherintellectual property right of TI covering or relating to any combination, machine, or process in which suchsemiconductor products or services might be or are used. TI’s publication of information regarding any thirdparty’s products or services does not constitute TI’s approval, warranty or endorsement thereof.Copyright © 1999, Texas Instruments Incorporated。

R1, C1Resistor 1, Capacitor 1 (Pins 6, 7)As shown in Figures 2 and 3, these pins accept a resistor and capacitor that are used to determine whether a narrow pulse or wide pulse has been received. The time constant R1 x C1 should be set to 1.72 encoder clock periods:R1 C1 = 3.95 R TC C TCR2/C2Resistor 2/Capacitor 2 (Pin 10)As shown in Figures 2 and 3, this pin accepts a resistor and capacitor that are used to detect both the end of a received word and the end of a transmission. The time constant R2 x C2 should be 33.5 encoder clock periods (four data periods per Figure 11): R2 C2 = 77 R TC C TC. This time constant is used to determine whether the D in pin has remained low for four data periods (end of transmission). A separate on–chip comparator looks at the voltage–equivalent two data periods (0.4 R2 C2) to detect the dead time between received words within a transmission.VTValid Transmission Output (Pin 11)This valid transmission output goes high after the second word of an encoding sequence when the following conditions are satisfied:1.the received addresses of both words match the local de-coder address, and2.the received data bits of both words match.VT remains high until either a mismatch is received or no input signal is received for four data periods.V SSNegative Power Supply (Pin 8)The most–negative supply potential. This pin is usually ground.V DDPositive Power Supply (Pin 16)The most–positive power supply pin.MC145026•MC145027•MC145028•SC41343•SC41344MOTOROLAMC145026•MC145027•MC145028•SC41343•SC41344MOTOROLA16APPLICATIONS INFORMATIONINFRARED TRANSMITTERIn Figure 18, the MC145026 encoder is set to run at an os-cillator frequency of about 4 to 9 kHz. Thus, the time required for a complete two–word encoding sequence is about 20 to 40 ms. The data output from the encoder gates an RC oscilla-tor running at 50 kHz; the oscillator shown starts rapidly enough to be used in this application. When the “send” button is not depressed, both the MC145026 and oscillator are in a low–power standby state. The RC oscillator has to be trimmed for 50 kHz and has some drawbacks for frequency stability. A superior system uses a ceramic resonator oscilla-tor running at 400 kHz. This oscillator feeds a divider as shown in Figure 19. The unused inputs of the MC14011UB must be grounded.The MLED81 IRED is driven with the 50 kHz square wave at about 200 to 300 mA to generate the carrier. If desired, two IREDs wired in series can be used (see Application Note AN1016 for more information). The bipolar IRED switch,shown in Figure 18, offers two advantages over a FET. First,a logic FET has too much gate capacitance for the MC14011UB to drive without waveform distortion. Second,the bipolar drive permits lower supply voltages, which are an advantage in portable battery–powered applications.The configuration shown in Figure 18 operates over a supply range of 4.5 to 18 V. A low–voltage system which operates down to 2.5 V could be realized if the oscillator sec-tion of a MC74HC4060 is used in place of the MC14011UB.The data output of the MC145026 is inverted and fed to the RESET pin of the MC74HC4060. Alternately, the MC74HCU04 could be used for the oscillator.Information on the MC14011UB is in book number DL131/D. The MC74HCU04 and MC74HC4060 are found in book number DL129/D.INFRARED RECEIVERThe receiver in Figure 20 couples an IR–sensitive diode to input preamp A1, followed by band–pass amplifier A2 with a gain of about 10. Limiting stage A3 follows, with an output of about 800 mV p–p. The limited 50 kHz burst is detected by comparator A4 that passes only positive pulses, and peak–detected and filtered by a diode/RC network to extract the data envelope from the burst. Comparator A5 boosts the sig-nal to logic levels compatible with the MC145027/28 data input. The D in pin of these decoders is a standard CMOS high–impedance input which must not be allowed to float.Therefore, direct coupling from A5 to the decoder input is utilized.Shielding should be used on at least A1 and A2, with good ground and high–sensitivity circuit layout techniques applied.For operation with supplies higher than + 5 V, limiter A4’s positive output swing needs to be limited to 3 to 5 V. This is accomplished via adding a zener diode in the negative feed-back path, thus avoiding excessive system noise. The bias-ing resistor stack should be adjusted such that V3 is 1.25 to 1.5 V.This system works up to a range of about 10 meters. The gains of the system may be adjusted to suit the individual design needs. The 100 Ω resistor in the emitter of the first 2N5088 and the 1 k Ω resistor feeding A2 may be altered if different gain is required. In general, more gain does not nec-essarily result in increased range. This is due to noise floor limitations. The designer should increase transmitter power and/or increase receiver aperature with Fresnal lensing to greatly improve range. See Application Note AN1016 for additional information.Information on the MC34074 is in data book DL128/D.TRINARY SWITCH MANUFACTURERS Midland Ross–Electronic Connector Div.GreyhillAugat/Alcoswitch Aries ElectronicsThe above companies may not have the switches in a DIP .For more information, call them or consult eem Electronic En-gineers Master Catalog or the Gold Book . Ask for SPDT with center OFF .Alternative: An SPST can be placed in series between a SPDT and the Encoder or Decoder to achieve trinary action.Motorola cannot recommend one supplier over another and in no way suggests that this is a complete listing of trinary switch manufacturers.。

MC145152频率合成器及其应用1.概述MC145152是MOTOROLA公司生产的大规模集成电路，它是一块采用半行码输入方式置定、由14根并行输入数据编程的双模CMOS－LSI锁相环频率合成器，其内部组成框图如图1所示。

该芯片内含参考频率振荡器、可供用户选择的参考分频器(12×8ROM参考译码器和12bit÷R计数器)、双端输出的鉴相器、控制逻辑、10位可编程的10bit÷N计数器、6位可编程的6bit÷A计数器和锁定检测等部分。

其中，10bit÷N计数器、6bit÷A计数器、模拟控制逻辑和外接双模前置分频器组成吞脉冲程序分频器，吞脉冲程序分频器的总分频比为：D=VN＋A。

2.管脚排列及功能MC145152的管脚排列如图2所示。

采用28脚DIP封装，各管脚功能如下：引脚4、5、6(R A0、R A1、R A2)为参考地址码输入端，用于选择参考分频器的分频比。

通过12×8ROM参考译码器和12bit÷R计数器进行编程。

分频比有8种选择，其参考地址码与分频比的关系见表1所列。

引脚26、27(OSC IN、OSC OUT)为参考振荡端，当两引脚接上一个并联谐振晶体时，便组成一个参考频率振荡器。

但在OSCIN到地和OSC OUT到地之间一般应接上频率置定电容(一般为15pF左右)。

OSC IN也可作为外部参考信号的输入端。

引脚1(VCO)为输入信号端，将输入信号交流耦合到本引脚，其输入信号频率应小于30MHz。

引脚10、21～25(A5～A0)为6bit÷A计数器的分频端。

其预置数决定了÷V/(V＋1)双模前置频器的÷V/(V＋1)的次数。

引脚11～20(N9～N0)为10bit÷N计数器的分频端。

引脚7、8(φV、φr)为鉴相器双输出端，用于输出环路误差信号。

如果f V>f r或f V的相位超前f r，则φV变为低电平而φr仍为高；如果f V<f r或者f V的相位滞后f r，则φr跳为低电平而φV保持为高；如果f V=f r 并f V与f r同相，则φV和φr保持高电平，仅在一个很短的时间内二者同时为低电平。