T7290APL

Central Office PCM Receive/Transmit Filter originally manufactured by AT&T (Lucent Technologies). This legacy telecommunications component is housed in a 28-pin dual-in-line package (DIP) and serves as a fundamental analog signal conditioner for Pulse Code Modulation (PCM) speech codecs. It functions by using integrated switched-capacitor filter arrays to execute precise bandpass filtering (restricting analog signals strictly within the standard 300 Hz to 3400 Hz voice band) while aggressively suppressing high-frequency power grid hum and background aliasing distortions. It saw extensive architectural integration inside landline telephone central office switching frames, commercial private branch exchange (PBX) systems, and retro telecommunication line cards. (Industry Equals: AT&T T7290APL, Lucent T7290APL, Intel 2912, National Semiconductor TP3040, Mitel MT8912, Motorola MC145414)