Hig h -Fre q u e n c y Wa ve fo rm Ge n e ra t o r
MAX038
____________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(Circuit of Figure 1, V+ = DV+ = 5V, V- = -5V, V
= V
= V
= V
= 0V, R = 1kΩ, C = 20pF, T = +25°C, unless
PDO L L
A
DADJ
FADJ
PDI
otherwise noted.)
OUTPUT SPECTRUM, SINE WAVE
OUTPUT SPECTRUM, SINE WAVE
(F = 11.5MHz)
o
(F = 5.9kHz)
o
0
0
R
V
DADJ
= 51kΩ (V = 2.5V), C = 0.01µF,
R
V
DADJ
= 15kΩ (V = 2.5V), C = 20pF,
IN
IN
F
IN
IN
F
-10
-10
= 50mV, V
= 0V
= 40mV, V
= -3V
FADJ
FADJ
-20
-30
-20
-30
-40
-50
-40
-50
-60
-70
-60
-70
-80
-90
-80
-90
-100
-100
0
10 20 30 40 50 60 70 80 90 100
FREQUENCY (MHz)
0
5
10 15 20 25 30 35 40 45 50
FREQUENCY (kHz)
______________________________________________________________P in De s c rip t io n
PIN
NAME
FUNCTION
1
REF
2.50V bandgap voltage reference output
Ground*
2, 6, 9,
11, 18
GND
3
4
A0
A1
Waveform selection input; TTL/CMOS compatible
Waveform selection input; TTL/CMOS compatible
External capacitor connection
5
COSC
DADJ
FADJ
IIN
7
Duty-cycle adjust input
8
Frequency adjust input
10
12
13
Current input for frequency control
PDO
PDI
Phase 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 be
synchronized with an external signal. Leave open if unused.
14
SYNC
15
16
17
19
20
DGND
DV+
V+
Digital ground
Digital +5V supply input. Can be left open if SYNC is not used.
+5V supply input
OUT
V-
Sine, 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 is
recommended (see Layout Considerations).
_______________________________________________________________________________________
7
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
