BH8220KS

Communication ICs Single chip analog signal processor for facsimiles BH8220KS The BH8220KS is a single-chip analog signal processing IC developed for facsimiles with telephone answering machines. FApplications Facsimiles and facsimiles with telephone answering machines FFeatures 1) Cross-point mixer with nine inputs and eight outputs. 2) Internal electronic volume. 3) Internal ALC and VOX circuits. 4) Accommodates no-ringing reception. FAbsolute maximum ratings (Ta = 25_C) FRecommended operating conditions (Ta = 25_C) 343 Communication ICs FBlock diagram BH8220KS 344 Communication ICs FPin descriptions BH8220KS 345 Communication ICs FElectrical characteristics BH8220KS (unless otherwise noted, Ta = 25_C, VCC = 5V, f = 1kHz, 400Hz to 30kHz using band pass filter) 346 Communication ICs BH8220KS FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 5V, f = 1kHz, 400Hz to 30kHz, band pass filter) FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 5V, f = 1kHz, 400Hz to 30kHz, band pass filter) 347 Communication ICs FMeasurement circuit BH8220KS FControl methods (1) Truth table 348 Communication ICs (2) Timing chart BH8220KS (3) Cross-point switch unit (bits used : 0 to 71) (4) Electronic volume (bits used : 72 to 79) (5) Cross-point unit electronic volume (bits used : 80 to 88) (6) Modem RX selector switch 349 Communication ICs (7) OUT7 pin (8) BH8220KS 1) Control table (selected with “1”; OFF = 0, ON = 1) 2...