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NJU7505 数据表(PDF) 3 Page - New Japan Radio

部件名 NJU7505
功能描述  BAND PASS FILTER FOR AUDIO SPECTRUM ANALYZER DISPLAY
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制造商  NJRC [New Japan Radio]
网页  http://www.jrc.co.jp/eng/index.html
标志 NJRC - New Japan Radio

NJU7505 数据表(HTML) 3 Page - New Japan Radio

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NJU7505
-3 -
Ver.2004-06-04
! FUNCTIONAL DESCRIPTION
# Interface to external controller
The example of the interface between the NJU7505 and the external controller is shown below;
(1) Example of the interface to the external controller ( Using the single )
After the RST signal from the external controller is input and then the internal circuit is initialized, each band data
is output as shown below timing chart;
Since the RD signal is output before each band is switched, the external controller is to count the number of the
RD signal and is to recognize the status of the band and is to read the output data from the AOUT terminal through
the external A/D converter.
The output type of the external controller connected to the RST/CLKO terminal as the RST input should be the
N-channel and open-drain type or the diode should be connected between the RST/CLKO terminal and the
output terminal of the external controller, so that the voltage of the RST/CLKO terminal is not gotten over the VSS
level.
Since the RD signal is output before 248/fOSC of each
band switched, the output data should be read out
within the limited time as shown right;
If the RST signal which pulse width is more than
4/fOSC is input, the internal circuit is initialized and the
data of f1 band is output from the AOUT terminal after
52/fOSC of the rise edge of the RST signal.
NJU7505
AIN
AOUT
OSC1
OSC2
fOSC
VSS
RD
A / D
CONVERTER
RST /CLKO
µ COM
A OUT
RD
RST
f1
f2
f3
f5
f1
f2
f4
f3
f1
f1
f2
f3
f1
f2
f3
f5
f1
f2
f4
f3
f1
f2
3*2 / fOSC
14
AOUT
248 / fosc
RD
8 / fosc
Available Period
of Read-out
AOUT
fn
RST
4/ fosc[MIN] 52/ f osc
f1


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