NJU7505XD Ver la hoja de datos (PDF) - Japan Radio Corporation
Número de pieza
componentes Descripción
Fabricante
NJU7505XD Datasheet PDF : 9 Pages
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NJU7505
(2) Example of the interface to the external controller (Using the double)
The 10 bands application is available using the cascade connection of the double NJU7505 as shown blow.
After the RST signals from the external controller are input to each of the master and the slave of the NJU7505
and then each internal circuit is initialized, each band data is output as shown below timing chart;
Since the RD signals are output from the master and the slave before each band is switched, the external
controller is to count the number of the RD signals and is to recognize the status of the band and is to read the
output data from each AOUT terminals through the external A/D converter.
The master clock for the slave is provided with the output signal from the RST/CLKO terminal of the master. The
master clock for the slave is stopped when the RST signal is input from the external controller to the master, so
that the RST/CLKO terminal of the master is used both as the RST input of the master and the master clock for
the slave.
The output type of the external controller connected to each RST/CLKO terminal as the RST input should be the
N-channel and open-drain type or the diode's should be connected between each RST/CLKO terminal and the
output terminals of the external controller, so that the voltage of each RST/CLKO terminal is not gotten over the
VSS level.
AIN
AIN
OSC1
A/D
CONVERTER
OSC2
NJU7505
NJU7505 OSC2
AOUT Slave
Mas ter
AOUT
RST/CLKO
RD RST/CLKO
VSS
RD
µ COM
Master
A OUT
RD
RST
Slave
A OUT
RD
RST
3*214 / fOSC
f1
f2
f3
f5 f1
f2
f4 f3
f1
f2
f3
f1
f2
f1
f2
f3 f5 f1
f2 f4 f3
f1
f2
f3
f1
3*214 / fOSC * 3/2
f1
f2
f1
f2
f3
f5
f1
f3
f5
f1
f2
f4
f3
f2
f4
f3
f1
f2
f1
-4-
Ver.2004-06-04
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