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| 型號： | N555 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | PRECISION TIMERS |
| 中文描述： | 精密定時器 |
| 文件頁數(shù)： | 14/24頁 |
| 文件大小： | 356K |
| 代理商： | N555 |
www.ti.com
Pulse-Position Modulation
As shown in
Figure 20
, any of these timers can be used as a pulse-position modulator. This application
modulates the threshold voltage and, thereby, the time delay, of a free-running oscillator.
Figure 21
shows a
triangular-wave modulation signal for such a circuit; however, any wave shape could be used.
V
Time 0.1 ms/div
R
A
= 3 k
R
B
= 500
R
L
= 1 k
See Figure 20
Capacitor Voltage
Output Voltage
Modulation Input Voltage
R
B
Modulation
Input
(see Note A)
CONT
TRIG
RESET
V
CC
OUT
DISCH
V
CC
(5 V to 15 V)
R
L
R
A
C
GND
THRES
NOTE A: The modulating signal can be direct or capacitively coupled
to CONT. For direct coupling, the effects of modulation
source voltage and impedance on the bias of the timer
should be considered.
Pin numbers shown are for the D, JG, P, PS, and PW packages.
4
8
3
7
6
2
5
Output
NA555, NE555, SA555, SE555
PRECISION TIMERS
SLFS022F–SEPTEMBER 1973–REVISED JUNE 2006
APPLICATION INFORMATION (continued)
Figure 20. Circuit for Pulse-Position Modulation
Figure 21. Pulse-Position-Modulation Waveforms
14
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