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NJU7505XD

BAND PASS FILTER FOR AUDIO SPECTRUM ANALYZER DISPLAY

Japan Radio Corporation  

NJU7505

Since each RD signal of the master and the slave is

output before 248/fOSC (248/fOSC*3/2) of each band

switched, the output data should be read out within the

limited time as shown right;

* The "( )" is corresponded to the slave.

A OUT

RD

Available Period

of Read-out

248 / fosc

(248/ fosc*3/2)

8 / fosc

(8/ fosc*3/2)

If the RST signal which pulse width is more than

4/fOSC is input to the master, the internal circuit is

initialized and the data of f1 band is output from the

AOUT terminal of the master after 52/fOSC of the rise

edge of the RST signal.

The RST signal for the slave should be set to "L" level

while the RST signal for the master is "L" level and

should keep "L" level more than 6/fOSC. So the slave

operates as same as the master after 78/fOSC of the

rise edge of the RST signal for the slave.

A OUT

(Master)

RST

(Master)

RST

(Slave)

A OUT

(Slave)

fn

f1

4/fosc[MIN]

52/ fsoc

6/fosc[MIN]

78/ fsoc

f n’

f 1’

Ver.2004-06-04

-5-

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