RPM7240-R Rohm Semiconductor, RPM7240-R Datasheet - Page 23
![RECEIVER REMOTE CTRL 40.0KHZ STR](/photos/40/15/401558/rpm7138-r_sml.jpg)
RPM7240-R
Manufacturer Part Number
RPM7240-R
Description
RECEIVER REMOTE CTRL 40.0KHZ STR
Manufacturer
Rohm Semiconductor
Specifications of RPM7240-R
Sensing Distance
15m
B.p.f. Center Frequency
40.0kHz
Voltage - Supply
2.7 V ~ 3.6 V
Current - Supply
500µA
Orientation
Side View
Mounting Type
Through Hole
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
7. Receiving Discrimination Method to Expand Effective Distance
Remote Control Receiver Module
1) Wide Pulse Width Jitter
«Bad Example»
Transmission waveform
Receiving waveform
at short distance
Receiving waveform
at long distance
If the communications distance is long or angled or has the incidence of optical noise, the
output pulse jitters will become larger at the limit of receiving, thus increasing the errors of the
pulse intervals T1 and T2. In order to correct the errors, T1" and T2" are provided with margins
according to the software discrimination of receiving, thus making it possible to increase the
effective distance.
In the above wiring pattern, the power noise of the digital block has an adverse influence on
the power supply pattern of the Remote Control Receiver Module.
Digital
block
GND
V
DD
Fig. 24 Countermeasures against Line Noise (Not Good)
Noise loop
Noise
T1
T1'
T1''
Fig. 25 Jitter Countermeasures
Remote Control
Receiver
Noise
Module
GND
V
CC
21
T2
T2'
T2''
Noise loop
Noise