NJU7507A

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...