NJU7505A
BAND PASS FILTER
FOR AUDIO SPECTRUM ANALYZER DISPLAY
PACKAGE OUTLINE
GENERAL DESCRIPTION
The NJU7505A 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.
NJU7505AD
NJU7505AM
PIN CONFIGURATION
FEATURES
BPF for the audio spectrum analyzer display of the 5 bands
10 bands extension is available by the cascade connection
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
OSC1
1
5
VDD
OSC2
2
6
AIN
3
7
AOUT
4
8
VSS
RSTb/CLKO
RD
BLOCK DIAGRAM
Audio Signal
RSTb/CLKO
Control Signal
Clock Signal
RD
OSC1
OSC2
fOSC
fOSC/16
fOSC/4 iH
BPF
High Band
AIN
Input BUF
VDD
+
VSS
Ver.2008-07-30
iL RL
RH
ΦH
ΦL
High Band
Peak Detector
Level Shifter
&
Output BUF
LPF
VDD
-
Power-on
Initialize
Control Circuit
OSC
BPF
Low Band
AOUT
Low Band
Peak Detector
AGND
VSS
-1-
