BAND PASS FILTER
NJU7507A
BAND PASS FILTER FOR AUDIO SPECTRUM ANALYZER DISPLAY
GENERAL DESCRIPTION
The NJU7507A is a band pass filter f...
Description
NJU7507A
BAND PASS FILTER FOR AUDIO SPECTRUM ANALYZER DISPLAY
GENERAL DESCRIPTION
The NJU7507A 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 7 bands which
filter constant is switched by the internal clock. Therefore, the audio signal shared of 7 bands is output from a serial output terminal. The 14 bands version using the double by the cascade connection is prepared.
PACKAGE OUTLINE NJU7507AD NJU7507AM
FEATURES
BPF for the audio spectrum analyzer display of the 7 bands
14 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
PIN CONFIGURATION
OSC1 1
OSC2 2
RSTb/CLKO RD
3 4
5 6 7 8
VDD AIN AOUT VSS
BLOCK DIAGRAM
RSTb/CLKO
RD
Audio Signal Control Signal Clock Signal
OSC1 OSC2
OSC
Control Circuit
fOSC fOSC/16 fOSC/4 iH
iL RL
RH
ΦH ΦL
Power-on Initialize
AIN
Input BUF
LPF
VDD VSS
VDD
-
+
AGND
VSS
BPF High Band
High Band Peak Detector
BPF Low Band
Low Band Peak Detector
Level Shifter &
Output BUF
AOUT
Ver.2008-07-30
-1-
NJU7507A
TERMINAL DESCRIPTION
NO. SYMBOL 1 OSC1 2 OSC2
3...
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