BH6629BFS

Magnetic disk ICs Read / Write amplifier for FDD BH6629BFS The BH6629BFS, a read / write IC designed for floppy disk drives, has a recording system that puts top priority on saddle margin. Offers multi-step switching of write current, while density and inner track / outer track edge are switched internally. FApplications Floppy disk drives (1MB and 2MB drives) FFeatures 1) Internal active filter switch. 2) Time domain filter (with internal switching based on transfer rate). 3) Internal switching of write current density and inner track / outer track. FAbsolute maximum ratings (unless otherwise noted, Ta = 25_C) FRecommended operating conditions (Ta = 25_C) 563 Magnetic disk ICs FBlock diagram BH6629BFS 564 Magnetic disk ICs FPin descriptions BH6629BFS 565 Magnetic disk ICs BH6629BFS 566 Magnetic disk ICs BH6629BFS 567 Magnetic disk ICs BH6629BFS 568 Magnetic disk ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 5V) Supply current BH6629BFS Low level voltage detection circuit Recovery time 569 Magnetic disk ICs Preamplifier BH6629BFS Preamplifier / L.P.F / differentiator (B.P.F) 570 Magnetic disk ICs Comparator and waveform shaping BH6629BFS Write circuit Erase output 571 Magnetic disk ICs Logic input BH6629BFS FMode table Total filter peak frequency setting f0 = a / (RRCC [kΩ +0.09) [kHz] a= 391 1M outer track 468 1M inner track 777 2M outer track 786 2M inner track 732 outer track (with OPTION 1), OPTION 2 777 ...