MAX038 High-Frequency Waveform Generator
MAX038 High-Frequency Waveform Generator MAX038 High-Frequency Waveform Generator
High-Frequency Waveform GeneratorMAX038____________________________Typical Operating Characteristics (continued)(Circuit of Figure 1, V+ = DV+ = 5V, V- = -5V, V DADJ = V FADJ = V PDI = V PDO = 0V, R L = 1kΩ, C L = 20pF, T A = +25°C, unlessotherwise noted.)SQUARE-WAVE OUTPUT (20MHz)FREQUENCY MODULATION USING FADJI IN = 400µAC F = 20pFTOP: OUTPUTBOTTOM: FADJ0.5V0-0.5VFREQUENCY MODULATION USING I INFREQUENCY MODULATION USING I INTOP: OUTPUTBOTTOM: I INTOP: OUTPUTBOTTOM: I INPULSE-WIDTH MODULATION USING DADJ+1V0V-1V+2V0V-2VTOP: SQUARE-WAVE OUT, 2V P-PBOTTOM: V DADJ, -2V to +2.3V6 _______________________________________________________________________________________
High-Frequency Waveform Generator____________________________Typical Operating Characteristics (continued)(Circuit of Figure 1, V+ = DV+ = 5V, V- = -5V, V DADJ = V FADJ = V PDI = V PDO = 0V, R L = 1kΩ, C L = 20pF, T A = +25°C, unlessotherwise noted.)ATTENUATION (dB)0-10-20-30-40-50-60-70-80-90-100OUTPUT SPECTRUM, SINE WAVE(F o = 11.5MHz)R IN = 15kΩ (V IN = 2.5V), C F = 20pF,V DADJ = 40mV, V FADJ = -3V0 10 20 30 40 50 60 70 80 90 100FREQUENCY (MHz)MAX038-12AATTENUATION (dB)0-10-20-30-40-50-60-70-80-90-100OUTPUT SPECTRUM, SINE WAVE(F o = 5.9kHz)R IN = 51kΩ (V IN = 2.5V), C F = 0.01µF,V DADJ = 50mV, V FADJ = 0V0 5 10 15 20 25 30 35 40 45 50FREQUENCY (kHz)MAX038 12BMAX038______________________________________________________________Pin DescriptionPIN12, 6, 9,11, 18NAMEREFGND2.50V bandgap voltage reference outputGround*FUNCTION34578101213141516171920A0A1COSCDADJFADJIINPDOPDISYNCDGNDDV+V+OUTV-Waveform selection input; TTL/CMOS compatibleWaveform selection input; TTL/CMOS compatibleExternal capacitor connectionDuty-cycle adjust inputFrequency adjust inputCurrent input for frequency controlPhase detector output. Connect to GND if phase detector is not used.Phase detector reference clock input. Connect to GND if phase detector is not used.TTL/CMOS-compatible output, referenced between DGND and DV+. Permits the internal oscillator to besynchronized with an external signal. Leave open if unused.Digital groundDigital +5V supply input. Can be left open if SYNC is not used.+5V supply inputSine, square, or triangle output-5V supply input*The five GND pins are not internally connected. Connect all five GND pins to a quiet ground close to the device. A ground plane isrecommended (see Layout Considerations)._______________________________________________________________________________________ 7
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<strong>High</strong>-<strong>Frequency</strong> <strong>Waveform</strong> <strong>Generator</strong>____________________________Typical Operating Characteristics (continued)(Circuit of Figure 1, V+ = DV+ = 5V, V- = -5V, V DADJ = V FADJ = V PDI = V PDO = 0V, R L = 1kΩ, C L = 20pF, T A = +25°C, unlessotherwise noted.)ATTENUATION (dB)0-10-20-30-40-50-60-70-80-90-100OUTPUT SPECTRUM, SINE WAVE(F o = 11.5MHz)R IN = 15kΩ (V IN = 2.5V), C F = 20pF,V DADJ = 40mV, V FADJ = -3V0 10 20 30 40 50 60 70 80 90 100FREQUENCY (MHz)<strong>MAX038</strong>-12AATTENUATION (dB)0-10-20-30-40-50-60-70-80-90-100OUTPUT SPECTRUM, SINE WAVE(F o = 5.9kHz)R IN = 51kΩ (V IN = 2.5V), C F = 0.01µF,V DADJ = 50mV, V FADJ = 0V0 5 10 15 20 25 30 35 40 45 50FREQUENCY (kHz)<strong>MAX038</strong> 12B<strong>MAX038</strong>______________________________________________________________Pin DescriptionPIN12, 6, 9,11, 18NAMEREFGND2.50V bandgap voltage reference outputGround*FUNCTION34578101213141516171920A0A1COSCDADJFADJIINPDOPDISYNCDGNDDV+V+OUTV-<strong>Waveform</strong> selection input; TTL/CMOS compatible<strong>Waveform</strong> selection input; TTL/CMOS compatibleExternal capacitor connectionDuty-cycle adjust input<strong>Frequency</strong> adjust inputCurrent input for frequency controlPhase detector output. Connect to GND if phase detector is not used.Phase detector reference clock input. Connect to GND if phase detector is not used.TTL/CMOS-compatible output, referenced between DGND and DV+. Permits the internal oscillator to besynchronized with an external signal. Leave open if unused.Digital groundDigital +5V supply input. Can be left open if SYNC is not used.+5V supply inputSine, square, or triangle output-5V supply input*The five GND pins are not internally connected. Connect all five GND pins to a quiet ground close to the device. A ground plane isrecommended (see Layout Considerations)._______________________________________________________________________________________ 7
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