NJU7505 Datasheet, PDF (1/9 Pages) New Japan Radio – BAND PASS FILTER FOR AUDIO SPECTRUM ANALYZER DISPLAY

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 1
5
OSC2 ₂
6
RST/CLKO ³
7
RD 4
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 f OSC
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
&
AOUT
Out Put BUF
VSS
VSS
Ver.2004-06-04
-1-