Sonar Ranging Module
SRM400
The SRM400 is a sonar ranging module
utilizing our new developed Sonar Ranging IC,
PW-0268, which can work with all our PT or
EP type transducers. SRM400 provides as a
shortcut to develop car reversing systems or
some other distance measurement systems for
design engineers who are not very familiar
with analog circuit and/or the operation of
ultrasonic transducers. By using this module
engineers can focus firstly on the other fields of
digital circuit and software designs as well as
some other mechanical issues. After first stage
then you can either design your own analog
circuit based on the module construction or
consult with factory for making your own
module for your special needs.
Features:
Operating Voltage: 6 – 10Vdc single source
Operating Frequency: broadband output
ranging up to 250KHz
Built-in variable RC oscillator matching
transducers with different frequencies
High Gain Amplifier: varies with time over
32 steps
Integrated
Band
Pass
Filter:
reduces
external component count,
Bi-direction I/O Pin: simplifies the control
function for transmitting a pulse and
receiving an echo
An adjustable System Clock: enables the
control of, the number of pulses transmitted,
the slope of the variable gain amplifier, and
the pulse repetition rate
Board size: 27.9 * 18 mm (L*W)
Specification:
Operation voltage
DC6 - 10V
Operation current
<20 mA ＠DC10V
Oscillation frequency
Variable RC oscillator
Amplifier gain
Pre-Amplifier
14 dB
2
nd Stage Amplifier 30 dB
Time controlled 32
steps main
amplifier
35 dB max.
Fc: 38 KHz
Bandwidth: 20KHz
Bandpass filter
Insertion loss: 1 dB
Driving voltage
(no load)
130Vpp;
pulse width 0.5ms
Bi-directional I/O
Input signal Open collector pull low
Output 0..05*Vcc to 0.9*Vcc
digital echo signals
Measuring distance
25 – 150 cm
SRM400 includes:
1. Module board
2. 400EP14D enclosed type transducer of
asymmetrical beam patterns, see detail
specification of 400EP14D.
3. Detail electrical schematic
S. Square Enterprise Company Limited
Pro-Wave Electronics Corporation
P.O. Box 1-70 Chung Ho, Taiwan, ROC; E-mail:
prowave@ms3.hinet.net; Tel: 886-2-22465101(5 lines), 22459774; Fax: 886-2-22465105
http://www.s2.com.tw ; http://www.prowave.com.tw
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