High-Frequency Waveform Generator
0
-100
0
20
60
100
OUTPUT SPECTRUM, SINE WAVE
(Fo = 11.5MHz)
-80
-20
MAX038-12A
FREQUENCY (MHz)
ATTENUATION
(dB)
40
80
-40
-60
-10
-30
-50
-70
-90
10
30
50
70
90
RIN = 15kΩ (VIN = 2.5V), CF = 20pF,
VDADJ = 40mV, VFADJ = -3V
0
-100
010
30
50
OUTPUT SPECTRUM, SINE WAVE
(Fo = 5.9kHz)
-80
-20
MAX038
12B
FREQUENCY (kHz)
ATTENUATION
(dB)
20
40
-40
-60
-10
-30
-50
-70
-90
5
15253545
RIN = 51kΩ (VIN = 2.5V), CF = 0.01μF,
VDADJ = 50mV, VFADJ = 0V
Pin Description
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V+ = DV+ = 5V, V- = -5V, VDADJ = VFADJ = VPDI = VPDO = 0V, RL = 1k
Ω/, CL = 20pF, TA = +25°C, unless
otherwise noted.)
PIN
NAME
FUNCTION
1
REF
2.50V bandgap voltage reference output
2, 6, 9,
11, 18
GND
Ground*
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.
14
SYNC
TTL/CMOS-compatible output, referenced between DGND and DV+. Permits the internal oscillator to be
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).
MAX038
Maxim Integrated
7