zsct1555 Zetex Semiconductors plc., zsct1555 Datasheet - Page 9

• Manufacturer Part Number: zsct1555
• Description: Precision Single Cell Timer
• Manufacturer: Zetex Semiconductors plc.

Issue 3 - July 2006
© Zetex Semiconductors plc 2006
Figure 9 gives an easy selection for RA, RB and
C
Similar to the PWM circuit of Figure 5 the astable
circuit can be configured with modulation of the
control input as shown in Figure 10. The result is a
pulse position modulated, PPM, circuit where the
pulse position is altered by the control input voltage.
Figure 9
Figure 10
T
values.
0.001
0.01
100
0.1
10
1
0.1
(RA+2RB)
Free Running Frequency (Hz)
100k
10M
1M
1
10
100
1k
10k
100k
Figure 11 shows the result of modulation with
a triangle wave input to the control pin.
Figure 11
ZSCT1555
www.zetex.com