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PDF NJU7505 Data sheet ( Hoja de datos )
| Número de pieza | NJU7505 | |
| Descripción | GEQ / DIP8 / DMP8 | |
| Fabricantes | JRC | |
| Logotipo |  |
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NJU7505
BAND PASS FILTER FOR AUDIO SPECTRUM ANALYZER DISPLAY
! GENERAL DESCRIPTION
The NJU7505 is a band pass filter for audio spectrum
analyzer display.
It consists of high and low band pass filters, CR oscillation
circuit, control circuit and DC transfer circuit.
Each band pass filter using the switched capacitor filter
technology operates at the shared time by 5 bands which
filter constant is switched by the internal clock.
Therefore, the audio signal shared of 5 bands is output from
a serial output terminal.
The 10 bands version using the double by the cascade
connection is prepared.
! PACKAGE OUTLINE
NJU7505XD NJU7505XM
! FEATURES
" BPF for the audio spectrum analyzer display of the 5 bands
" 10 bands extension is available by the cascade connection
(Version of A: For 5-band application by the single)
(Version of B: For 10-band application by the double)
" BPF using the switched capacitor filter technology
" CR oscillation circuit on chip
(External clock input is available)
" Power-on initialization circuit on chip
(External reset input is available)
" C-MOS Technology
" Package Outline
DIP8, DMP8
! PIN CONFIGURATION
OSC1
OSC2
RST/CLKO
RD
1
2
3
4
5
6
7
8
VDD
AIN
AOUT
VSS
! BLOCK DIAGRAM
RST/CLKO
RD
Audi o Signal
Control Signa
Crock Signal
OSC1
OSC2
OSC
Cont rol Circuit
f f fOSC
OSC /1 6
OSC /4
iH
iL RL
RH
ΦH ΦL
Power-on
Initialize
AIN Input BUF LPF
VDD
VDD
AGND
BPF
High Band
High Band
Peak Detector
BPF
Low Band
Low Band
Peak Detector
Lev el Shif ter
&
Out Put BUF
VSS VSS
AOUT
Ver.2004-06-04
-1-
1 page  
www.DataSheet4U.com
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
4/fosc[MIN]
52/ fsoc
f1
6/fosc[MIN]
f n’
78/ fsoc
f 1’
Ver.2004-06-04
-5-
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet NJU7505.PDF ] | |
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