MAX038 High-Frequency Waveform GeneratorTypical Operating Characteristics (continued) (Circuit of Figure 1, V+ = DV+ = 5V, V- = -5V, VDADJ = VFADJ = VPDI = VPDO = 0V, RL = 1kΩ/, CL = 20pF, TA = +25°C, unless otherwise noted.) OUTPUT SPECTRUM, SINE WAVEOUTPUT SPECTRUM, SINE WAVE(Fo = 11.5MHz)(Fo = 5.9kHz) 0 0 RIN = 15kΩ (VIN = 2.5V), CF = 20pF, 12B RIN = 51kΩ (VIN = 2.5V), CF = 0.01μF, -10 VDADJ = 40mV, VFADJ = -3V -10 V MAX038-12A DADJ = 50mV, VFADJ = 0V MAX038 -20 -20 -30 -30 -40 -40 -50 -50 -60 -60 ATTENUATION (dB) -70 ATTENUATION (dB) -70 -80 -80 -90 -90 -100 -100 0 10 20 30 40 50 60 70 80 90 100 0 5 10 15 20 25 30 35 40 45 50 FREQUENCY (MHz) FREQUENCY (kHz) Pin DescriptionPINNAMEFUNCTION 1 REF 2.50V bandgap voltage reference output 2, 6, 9, GND Ground* 11, 18 3 A0 Waveform selection input; TTL/CMOS compatible 4 A1 Waveform selection input; TTL/CMOS compatible 5 COSC External capacitor connection 7 DADJ Duty-cycle adjust input 8 FADJ Frequency adjust input 10 IIN Current input for frequency control 12 PDO Phase detector output. Connect to GND if phase detector is not used. 13 PDI Phase detector reference clock input. Connect to GND if phase detector is not used. TTL/C M O S - com p ati b l e outp ut, r efer enced b etw een D G N D and D V + . P er m i ts the i nter nal osci l l ator to b e 14 SYNC synchronized with an external signal. Leave open if unused. 15 DGND Digital ground 16 DV+ Digital +5V supply input. Can be left open if SYNC is not used. 17 V+ +5V supply input 19 OUT Sine, square, or triangle output 20 V- -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 is recommended (see Layout Considerations). Maxim Integrated 7 Document Outline Blank Page
