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參數(shù)資料
| 型號： | MAX038 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | High-Frequency Waveform Generator |
| 中文描述： | 高頻波形發(fā)生器 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 203K |
| 代理商： | MAX038 |
With FADJ disabled, the output frequency can still be
changed by modulating I
IN
.
Swept Frequency Operation
The output frequency can be swept by applying a vary-
ing signal to IIN or FADJ . IIN has a wider range, slightly
slower response, lower temperature coefficient, and
requires a single polarity current source. FADJ may be
used when the swept range is less than ±70% of the
center frequency, and it is suitable for phase-locked
loops and other low-deviation, high-accuracy closed-
loop controls. It uses a sweeping voltage symmetrical
about ground.
Connecting a resistive network between REF, the volt-
age source, and FADJ or IIN is a convenient means of
offsetting the sweep voltage.
Duty Cycle
The voltage on DADJ controls the waveform duty cycle
(defined as the percentage of time that the output
waveform is positive). Normally, V
DADJ
= 0V, and the
duty cycle is 50% (Figure 2). Varying this voltage from
+2.3V to -2.3V causes the output duty cycle to vary
from 15% to 85%, about -15% per volt. Voltages
beyond ±2.3V can shift the output frequency and/or
cause instability.
DADJ can be used to reduce the sine-wave distortion.
The unadjusted duty cycle (V
DADJ
= 0V) is 50% ±2%;
any deviation from exactly 50% causes even order har-
monics to be generated. By applying a small
adjustable voltage (typically less than ±100mV) to
V
DADJ
, exact symmetry can be attained and the distor-
tion can be minimized (see Figure 2).
The voltage on DADJ needed to produce a specific
duty cycle is given by the formula:
V
DADJ
= (50% - dc) x 0.0575
or:
V
DADJ
= (0.5 - [t
ON
÷ t
o
]) x 5.75
where:
V
DADJ
= DADJ voltage (observe the polarity)
dc = duty cycle (in %)
t
ON
= ON (positive) time
t
o
= waveform period.
Conversely, if V
DADJ
is known, the duty cycle and ON
time are given by:
dc = 50% - (V
DADJ
x 17.4)
t
ON
= t
o
x (0.5 - [V
DADJ
x 0.174])
[11]
[12]
[13]
[14]
M
High-Frequenc y Waveform Generator
______________________________________________________________________________________
11
MAX038
1μF
GND
9
COSC
12
AO
V-
18
11
2
6
GNDGND
GNDGND
5
8
10
7
1
13
14
15
16
N.C.
3
FADJ
IIN
DADJ
REF
OUT
DV+
DGND
SYNC
PDI
PDO
V+ A1
4
17
20
–5V +5V
C2
1nF
C3
1μF
C1
12k
R1
20k
R
IN
FREQUENCY
50
R2
N.C.
C
F
19
SINE-WAVE
OUTPUT
2 x 2.5V
R
IN
x C
F
F
o
=
MAX038
100k
R5
5k
R6
100k
R7
100k
R3
100k
R4
DADJ
REF
+2.5V
–2.5V
PRECISION DUTY-CYCLE ADJUSTMENT CIRCUIT
ADJUST R6 FOR MINIMUM SINE-WAVE DISTORTION
Figure 2. Operating Circuit with Sine-Wave Output and 50% Duty Cycle; SYNC and FADJ Disabled
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