Datasheet

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S15E.pdf
08.10.31
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Applications
2. Transmitting and Receiving Circuits
Examples of transmitting and receiving circuits using
MA40S4R/S are shown in Figs.12 to 14. By changing a
part of the constants, they can be applied for other pur-
poses.
Fig.12 is a simple circuit using a C-MOS IC and is used
for continuously transmitting ultrasonic waves.
Fig.13 is a pre-amp circuit that amplifies the ultrasonic
receiving signal.
Fig.14 is an ultrasonic pulse transmitting circuit.
2 11
7 6
9
14
10
15
12
345
100k
17Vp-p
30k
Freq.=40kHz
560p
Vcc=12V
Id=15mA
4049B
(Vc:1p) (GND:8P)
Ultrasonic Sensor (Transmitter)
GND
Fig. 12 Example of Continuous Wave Transmitting Circuit
2
1
3
4
5
6
100k 30k
Freq.=40kHz
560p
0.01
0.01
555
4049B
(Vc:1p)
(GND:8P)
GND
40kHz
1ms
25ms
0.1
4011B
(Vc:14p)
(GND:7P)
Ultrasonic Sensor
(Transmitter)
20Vp-p
13
1215143
1
5
4
8
2
6
150k 3.3M
7
11
10
8
9
3
5
2
4
109
11 12
Vcc=12V
Id=15mA
Timming Pulse
Out
Fig. 14 Example of Pulse Transmitting Circuit
1k
Rf
100k
2
3 4
8
1
1000p
Gain=32dB
100k
100k
100k
0.01
0.01
10
3.9k
Ultrasonic Sensor
(Receiver)
–
+
+
4556
Out put
Fig. 13 Example of Receiving Circuit