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参数资料
| 型号： | LMC555H/883 |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 模拟波形发生器 |
| 英文描述： | PULSE; RECTANGULAR, 3 MHz, TIMER, BCY8 |
| 封装： | METAL CAN, TO-99, 8 PIN |
| 文件页数： | 16/18页 |
| 文件大小： | 921K |
| 代理商： | LMC555H/883 |
Application Information (Continued)
PULSE POSITION MODULATOR
This application uses the timer connected for astable opera-
tion, as in Figure 10, with a modulating signal again applied
to the control voltage terminal. The pulse position varies with
the modulating signal, since the threshold voltage and hence
the time delay is varied. Figure 11 shows the waveforms
generated for a triangle wave modulation signal.
50% DUTY CYCLE OSCILLATOR
The frequency of oscillation is
f = 1/(1.4 R
CC)
micro SMD Marking Orientation
Top View
00866923
Bumps are numbered counter-clockwise
00866915
VCC = 5V
Top Trace: Modulation 1 V/Div.
TIME = 0.2 ms/Div.
Bottom Trace: Output Voltage 2 V/Div.
RA = 9.1 k
C = 0.01 F
FIGURE 9. Pulse Width Modulator Waveforms
00866921
FIGURE 10. Pulse Position Modulator
00866916
VCC = 5V
Top Trace: Modulation Input 1 V/Div.
TIME = 0.1 ms/Div.
Bottom Trace: Output Voltage 2 V/Div.
RA = 3.9 k
RB =3k
C = 0.01 F
FIGURE 11. Pulse Position Modulator Waveforms
00866906
FIGURE 12. 50% Duty Cycle Oscillator
LMC555
www.national.com
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