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. Applications Facsimiles and facsimiles with telephone answering machines Features 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. Absolute maximum ratings (Ta = 25C) Recommended operating conditions (Ta = 25C) 343 Communication ICs Block diagram 344 BH8220KS Communication ICs BH8220KS Pin descriptions 345 Communication ICs Electrical characteristics 346 BH8220KS (unless otherwise noted, Ta = 25C, VCC = 5V, f = 1kHz, 400Hz to 30kHz using band pass filter) Communication ICs BH8220KS Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = 5V, f = 1kHz, 400Hz to 30kHz, band pass filter) Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = 5V, f = 1kHz, 400Hz to 30kHz, band pass filter) 347 Communication ICs Measurement circuit Control methods (1) Truth table 348 BH8220KS Communication ICs (2) Timing chart (3) Cross-point switch unit (bits used : 0 to 71) (4) Electronic volume (bits used : 72 to 79) BH8220KS (5) Cross-point unit electronic volume (bits used : 80 to 88) (6) Modem RX selector switch 349 Communication ICs (7) OUT7 pin Electrical characteristic curves 350 BH8220KS (8) 1) Control table (selected with “1”; OFF = 0, ON = 1) 2) Bits 89 to 92 are reserved for use as spare bits. 3) When resetting, Bit 95 is “1” and all other bits are “0”. Communication ICs BH8220KS External dimensions (Units: mm) 351