TP5089中文资料

TL H 5057TP5089DTMF(TOUCH-TONE)GeneratorDecember 1991TP5089DTMF (TOUCH-TONE)GeneratorGeneral DescriptionThe TP5089is a low threshold voltage field-implanted met-al gate CMOS integrated circuit It interfaces directly to a standard telephone keypad and generates all dual tone mul-ti-frequency pairs required in tone-dialing systems The tone synthesizers are locked to an on-chip reference oscillator using an inexpensive 3 579545MHz crystal for high tone accuracy The crystal and an output load resistor are the only external components required for tone generation A MUTE OUT logic signal which changes state when any key is depressed is also providedFeaturesY 3 5V–10V operation when generating tones Y 2V operation of keyscan and MUTE logic Y Static sensing of key closures or logic inputsY On-chip 3 579545MHz crystal-controlled oscillator Y Output amplitudes proportional to supply voltage Y High group pre-emphasis Y Low harmonic distortionY Open emitter-follower low-impedance output YSINGLE TONE INHIBIT pinBlock DiagramTL H 5057–1FIGURE 1C 1995National Semiconductor Corporation RRD-B30M115 Printed in U S AAbsolute Maximum RatingsIf Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage(V DD b V SS)15V Maximum Voltage at Any Pin V DD a0 3V to V SS b0 3V Operating Temperature b30 C to a60 C Storage Temperature b55 C to a150 C Maximum Power Dissipation500mWElectrical Characteristics Unless otherwise noted limits printed in BOLD characters are guaranteed for V DD e 3 5V to10V T A e0 C to a60 C by correlation with100%electrical testing at T A e25 C All other limits are assured by correlation with other production tests and or product design and characterizationParameter Conditions Min Typ Max UnitsMinimum Supply Voltage for Keysense2V and MUTE Logic FunctionsMinimum Operating Voltage3 5V for generating tonesOperating Current Mute open225m A Idle R L e%1 12 5mA Generating Tones V DD e3 5VInput ResistorsCOLUMN and ROW(Pull-Up)2550k X SINGLE TONE INHIBIT(Pull-Down)120k X TONE DISABLE(Pull-Up)Input Low Level0 2V DD V Input High Level0 8V DD VMUTE OUT Sink Current V DD e3 5V0 4mA (COLUMN and ROW Active)V o e0 5VMUTE Out Leakage Current V o e V DD1m AOutput Amplitude R L e240X190250340mVrms Low Group V DD e3 5VR L e240X510700880mVrmsV DD e10VOutput Amplitude R L e240X270340470mVrms High Group V DD e3 5VR L e240X7359551265mVrmsV DD e10VMean Output DC Offset V DD e3 5V1 3VV DD e10V4 6VHigh Group Pre-Emphasis2 22 73 2dBDual Tone Total Harmonic Distortion Ratio V DD e4V R L e240Xb23b22dB1MHz BandwidthStart-Up Time(to90%Amplitude)35mS Note1 R L is the external load resistor connected from TONE OUT to V SSNote2 Crystal specification Parallel resonant3 579545MHz R S s150X L e100mH C O e5pF C I e0 02pF2Connection DiagramDual-In-Line PackageTL H 5057–2Top ViewOrder Number TP5089NSee NS Package N16APin DescriptionsSymbol DescriptionV DD This is the positive voltagesupply to the device referencedto V SS The collector of theTONE OUT transistor isconnected to this pinV SS This is the negative voltagesupply All voltages arereferenced to this pinOSC IN OSC OUT All tone generation timing isderived from the on-chiposcillator circuit A low cost3 579545MHz A-cut crystal(NTSC TV color-burst)isneeded between pins7and8Load capacitors and a feedbackresistor are included on-chip forgood start-up and stability Theoscillator stops when columninputs are sensed with no validinput having been detected Theoscillator is also stopped whenthe TONE DISABLE input ispulled to logic lowRow and Column Inputs When no key is pushed pull-upresistors are active on row andcolumn inputs A key closure isrecognized when a single rowand a single column areconnected to V SS which startsthe oscillator and initiates tonegeneration Negative-true logicsignals simulating key closurescan also be usedTONE DISABLE The TONE DISABLE input has Input an internal pull-up resistorWhen this input is open or atlogic high the normal toneoutput mode will occur WhenTONE DISABLE input is at logiclow the device will be in theinactive mode TONE OUT willbe at an open circuit stateSymbol DescriptionMUTE Output The MUTE output is an open-drain N-channel device thatsinks current to V SS with anykey input and is open when nokey input is sensed The MUTEoutput will switch regardless ofthe state of the SINGLE TONEINHIBIT inputSINGLE TONE INHIBIT The SINGLE TONE INHIBITInput input is used to inhibit thegeneration of other than validtone pairs due to multiple row-column closures It has a pull-down resistor to V SS and whenleft open or tied to V SS anyinput condition that wouldnormally result in a single tonewill now result in no tone withall other functions operatingnormally When tied to V DDsingle or dual tones may begenerated see Table II TONE OUT This output is the open emitterof an NPN transistor thecollector of which is connectedto V DD When an external loadresistor is connected fromTONE OUT to V SS the outputvoltage on this pin is the sum ofthe high and low group sine-waves superimposed on a DCoffset When not generatingtones this output transistor isturned OFF to minimize thedevice idle currentAdjustment of the emitter loadresistor results in variation ofthe mean DC current duringtone generation the sinewavesignal current through theoutput transistor and the outputdistortion Increasing values ofload resistance decrease boththe signal current and distortion Functional DescriptionWith no key inputs to the device the oscillator is inhibited the output transistor is pulled OFF and device current con-sumption is reduced to a minimum Key closures are sensed statically Any key closure activates the MUTE output starts the oscillator and sets the high group and low group pro-grammable counters to the appropriate divide ratio These counters sequence two ratioed-capacitor D A converters through a series of28equal duration steps per sine-wave cycle The two tones are summed by a mixer amplifier with pre-emphasis applied to the high group tone The output is an NPN emitter-follower requiring the addition of an external load resistor to V SS This resistor facilitates adjustment of the signal current flowing from V DD through the output tran-sistorThe amplitude of the output tones is directly proportional to the device supply voltage3Functional Description(Continued)TABLE I Output Frequency AccuracyTone Valid Standard Tone Output%DeviationGroup Input DTMF(Hz)Frequency from StandardLow R1697694 8b0 32Group R2770770 1a0 02f L R3852852 4a0 03R4941940 0b0 11High C112091206 0b0 24Group C213361331 7b0 32f H C314771486 5a0 64C416331639 0a0 37TABLE II Functional Truth TableSINGLE TONE TONE ROW COLUMN TONE OUT MUTEINHIBIT DISABLE Low HighX O O C O C0V0V O CX X O C O C0V0V O CX0One One V OS V OS OX1One One f L f H O112or More One f H O11One2or More f L O112or More2or More V OS V OS O012or More One V OS V OS O01One2or More V OS V OS O012or More2or More V OS V OS O Note1 X is don’t care stateNote2 V OS is the output offset voltageTL H 5057–3Adjust R E for desired tone amplitudeFIGURE2 Typical Application45T P 5089D T M F (T O U C H -T O N E )G e n e r a t o rPhysical Dimensions inches (millimeters)Lit 113986Molded Dual-In-Line Package (N)Order Number TP5089N NS Package N16ALIFE SUPPORT POLICYNATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION As used herein 1 Life support devices or systems are devices or 2 A critical component is any component of a life systems which (a)are intended for surgical implant support device or system whose failure to perform can into the body or (b)support or sustain life and whose be reasonably expected to cause the failure of the life failure to perform when properly used in accordance support device or system or to affect its safety or with instructions for use provided in the labeling can effectivenessbe reasonably expected to result in a significant injury to the userNational Semiconductor National Semiconductor National Semiconductor National Semiconductor CorporationEuropeHong Kong LtdJapan Ltd1111West Bardin RoadFax (a 49)0-180-530858613th Floor Straight Block Tel 81-043-299-2309。