High-Frequency Waveform Generator - Maxim Integrated

1 AVAILABLEF unctional DiagramsPin Configurations appear at end of data Diagrams continued at end of data is a trademark of Maxim Integrated Products, pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim s website at DescriptionThe MAX038 is a High-Frequency , precision functiongenerator producing accurate, High-Frequency triangle,sawtooth, sine, square, and pulse waveforms with aminimum of external components. The output frequencycan be controlled over a frequency range of to20 MHz by an internal bandgap voltagereference and an external resistor and capacitor. Theduty cycle can be varied over a wide range by applyinga control signal, facilitating pulse -width modula -tion and the generation of sawtooth modulation and frequency sweeping areachieved in the same way.

2 The duty cycle and frequen-cy controls are independent. Sine, square, or triangle waveforms can be selected atthe output by setting the appropriate code at twoTTL-compatible select pins. The output signal for allwaveforms is a 2VP-Psignal that is symmetrical aroundground. The low-impedance output can drive up to TTL-compatible SYNC output from the internaloscillator maintains a 50% duty cycle regardless ofthe duty cycle of the other waveforms to synchronizeother devices in the system. The internal oscillator canbe synchronized to an external TTL clock connected to Function GeneratorsVoltage-Controlled OscillatorsFrequency ModulatorsPulse-Width ModulatorsPhase-Locked LoopsFrequency SynthesizerFSK Generator Sine and Square WavesFeatures to 20 MHz Operating Frequency Range Triangle, Sawtooth, Sine, Square, and PulseWaveforms Independent Frequency and Duty-CycleAdjustments 350 to 1 Frequency Sweep Range 15% to 85% Variable Duty Cycle Low-Impedance Output Buffer.

3 Low 200ppm/ C Temperature DriftHigh-Frequency Waveform Generator2019181716151413121112345678910 V-OUTGNDV+A1A0 GNDREFTOP VIEWMAX038DV+DGNDSYNCPDIFADJDADJGNDCOSCP DOGNDIINGNDDIP/SOPin ConfigurationOrdering Information* Contact factory prior to RANGEPIN-PACKAGEMAX038 CPP0 C to +70 C20 Plastic DIPMAX038 CWP0 C to +70 C20 SOMAX038C/D*0 C to +70 CDiceOrdering Information19-0266; Rev 7; 8/07* Contact factory prior to Waveform GeneratorABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(Circuit of Figure 1, GND = DGND= 0V, V+ = DV+ = 5V, V- = -5V, VDADJ= VFADJ= VPDI= VPDO= 0V, CF= 100pF,RIN= 25k RL= 1k , CL= 20pF, TA= TMINto TMAX, unless otherwise noted.)

4 Typical values are at TA= +25 C.)Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functionaloperation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure toabsolute maximum rating conditions for extended periods may affect device + to GND .. to +6 VDV+ to to +6VV- to GND ..+ to -6 VPin VoltagesIIN, FADJ, DADJ, PDO ..(V- - ) to (V+ + )COSC ..+ to VA0, A1, PDI, SYNC, to V+GND to DGND .. Current into Any Pin .. 50mAOUT, REF Short-Circuit Duration to GND, V+, V- ..30sContinuous Power Dissipation (TA = +70 C)Plastic DIP (derate C above +70 C).

5 889mWSO (derate C above +70 C) ..800mWCERDIP (derate C above +70 C) ..889mWOperating Temperature RangesMAX038C_ _ ..0 C to +70 CMaximum Junction Temperature ..+150 CStorage Temperature Range ..-65 C to +150 CLead Temperature (soldering, 10s) ..+300 CPARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS FREQUENCY CHARACTERISTICSM aximum Operating FrequencyFoCF 15pF, IIN = 500 = ProgrammingCurrentIINVFADJ = AIIN Offset VoltageVIN Fo/ CVFADJ = 0V600 Frequency TemperatureCoefficientFo/ CVFADJ = -3V200ppm/ C( Fo/Fo) V+V- = -5V, V+ = to Power-SupplyRejection( Fo/Fo) V-V+ = 5V, V- = to AMPLIFIER (applies to all waveforms)Output Peak-to-Peak SymmetryVOUT 4mVOutput Output Short-Circuit CurrentIOUTS hort circuit to GND40mASQUARE-WAVE OUTPUT (RL = 100 ) TimetR10% to 90%12nsFall TimetF90% to 10%12nsDuty CycledcVDADJ = 0V, dc = tON/t x 100%475053%TRIANGLE-WAVE OUTPUT (RL = 100 )

6 = 100kHz, 5% to 95% CycledcVDADJ = 0V (Note 1)475053%SINE-WAVE OUTPUT (RL = 100 ) Harmonic DistortionTHDCF = 1000pF, FO = IntegratedHigh-Frequency Waveform GeneratorNote 1:Guaranteed by duty-cycle test on square 2:VREFis independent of CHARACTERISTICS (continued)(Circuit of Figure 1, GND = DGND= 0V, V+ = DV+ = 5V, V- = -5V, VDADJ= VFADJ= VPDI= VPDO= 0V, CF= 100pF,RIN= 25k RL= 1k , CL= 20pF, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25 C.)PARAMETERSYMBOLCONDITIONSMINTYPMAXUNI TSSYNC OUTPUTO utput Low VoltageVOLISINK = High VoltageVOHISOURCE = 400 TimetR10% to 90%, RL = 3k , CL = 15pF10nsFall TimetF90% to 10%, RL = 3k , CL = 15pF10nsDuty CycledcSYNC50%DUTY-CYCLE ADJUSTMENT (DADJ)DADJ Input CurrentIDADJ190250320 ADADJ Voltage RangeVDADJ Adjustment VDADJ + Nonlinearitydc/VFADJ-2V VDADJ +2V24%Change in Output Frequencywith DADJFo/VDADJ-2V VDADJ +2V 8%Maximum DADJ ModulatingFrequencyFDC2 MHzFREQUENCY ADJUSTMENT (FADJ)

7 FADJ Input CurrentIFADJ190250320 AFADJ Voltage RangeVFADJ Sweep VFADJ + 70%FM Nonlinearity with FADJFo/VFADJ-2V VFADJ +2V in Duty Cycle with FADJdc/VFADJ-2V VFADJ +2V 2%Maximum FADJ ModulatingFrequencyFF2 MHzVOLTAGE REFERENCEO utput VoltageVREFIREF = CoefficientVREF/ C20ppm/ C0mA IREF 4mA (source)12 Load RegulationVREF/IREF-100 A IREF 0 A (sink)14mV/mALine RegulationVREF/V+ V+ (Note 2)12mV/VLOGIC INPUTS (A0, A1, PDI)Input Low High Current (A0, A1)IIL, IIHVA0, VA1 = VIL, VIH 5 AInput Current (PDI)IIL, IIHVPDI = VIL, VIH 25 APOWER SUPPLYP ositive Supply VoltageV+ Supply VoltageDV+ Supply Supply CurrentI+3545mASYNC Supply CurrentIDV+12mANegative Supply CurrentI4555mAMAX038 Maxim Integrated3 High-Frequency Waveform GeneratorTypical Operating Characteristics(Circuit of Figure 1, V+ = DV+ = 5V, V- = -5V, VDADJ= VFADJ= VPDI= VPDO= 0V, RL= 1k /, CL= 20pF, TA= +25 C, unlessotherwise noted.)

8 FREQUENCYvs. IIN CURRENT 10100 MAX038-08 IIN CURRENT ( A)OUTPUT FREQUENCY (Hz)1011k10k100k1M10M100M100 F47 F10 F1 OUTPUT FREQUENCYvs. FADJ (V)FOUT = 100 A, COSC = OUTPUT FREQUENCYvs. DADJ (V)NORMALIZED OUTPUT = 10 AIIN = 25 AIIN = 50 AIIN = 100 AIIN = 250 AIIN = 500 LINEARITYvs. DADJ (V)DUTY-CYCLE LINEARITY ERROR (%) = 10 AIIN = 25 AIIN = 50 AIIN = 100 AIIN = 250 AIIN = 500 A600-32 DUTY CYCLE vs. DADJ VOLTAGE1050 MAX038-16 BDADJ (V)DUTY CYCLE (%)03020-2-11407080901003 IIN = 200 AMAX0384 Maxim IntegratedHigh-Frequency Waveform GeneratorSINE-WAVE OUTPUT (50Hz)TOP: OUTPUT 50Hz = FoBOTTOM: SYNCIIN = 50 ACF = 1 FTRIANGLE-WAVE OUTPUT (50Hz)TOP: OUTPUT 50Hz = FoBOTTOM: SYNCIIN = 50 ACF = 1 FSQUARE-WAVE OUTPUT (50Hz)TOP: OUTPUT 50Hz = FoBOTTOM: SYNCIIN = 50 ACF = 1 FSINE-WAVE OUTPUT (20 MHz)IIN = 400 ACF = 20pFTRIANGLE-WAVE OUTPUT (20 MHz)IIN = 400 ACF = 20pFSINE WAVE THD vs.

9 FREQUENCYMAX038 toc01 FREQUENCY (Hz)THD (%)1M100k10k1k1234567010010 MTypical Operating Characteristics (continued)(Circuit of Figure 1, V+ = DV+ = 5V, V- = -5V, VDADJ= VFADJ= VPDI= VPDO= 0V, RL= 1k /, CL= 20pF, TA= +25 C, unlessotherwise noted.)MAX038 Maxim Integrated5 High-Frequency Waveform GeneratorTypical Operating Characteristics (continued)(Circuit of Figure 1, V+ = DV+ = 5V, V- = -5V, VDADJ= VFADJ= VPDI= VPDO= 0V, RL= 1k /, CL= 20pF, TA= +25 C, unlessotherwise noted.)FREQUENCY modulation USING FADJTOP: OUTPUTBOTTOM: modulation USING IINTOP: OUTPUTBOTTOM: IINFREQUENCY modulation USING IINTOP: OUTPUTBOTTOM: IINPULSE-WIDTH modulation USING DADJTOP: SQUARE-WAVE OUT, 2VP-PBOTTOM.

10 VDADJ, -2V to + +1V0V-1V+2V0V-2 VSQUARE-WAVE OUTPUT (20 MHz)IIN = 400 ACF = 20pFMAX0386 Maxim IntegratedHigh-Frequency Waveform Generator0-10002060100 OUTPUT SPECTRUM, SINE WAVE(Fo = )-80-20 MAX038-12 AFREQUENCY (MHz)ATTENUATION (dB)4080-40-60-10-30-50-70-901030507090 RIN = 15k (VIN = ), CF = 20pF, VDADJ = 40mV, VFADJ = -3V0-1000103050 OUTPUT SPECTRUM, SINE WAVE(Fo = )-80-20 MAX038 12 BFREQUENCY (kHz)ATTENUATION (dB)2040-40-60-10-30-50-70-905 15253545 RIN = 51k (VIN = ), CF = F, VDADJ = 50mV, VFADJ = 0V Pin DescriptionTypical Operating Characteristics (continued)(Circuit of Figure 1, V+ = DV+ = 5V, V- = -5V, VDADJ= VFADJ= VPDI= VPDO= 0V, RL= 1k /, CL= 20pF, TA= +25 C, unlessotherwise noted.)