BH6625FS

Magnetic disk ICs Read / Write amplifier for FDD BH6625FS The BH6625FS is a 4-mode read / write IC designed for floppy disk drives, and has an active filter that can be set according to transfer rate. Any of multiple write current settings can be selected, and inner track / outer track switching is done internally. FApplications Floppy disk drives (1MB, 1.6MB and 2MB) FFeatures 1) Internal active filter with multiple settings that can be selected for multiple Q and f0. 2) Time domain filter that is internally switchable according to transfer rate. 3) Any of multiple write current settings can be selected, and inner track / outer track switching is done internally. FAbsolute maximum ratings (unless otherwise noted, Ta = 25_C) FRecommended operating conditions (Ta = 25_C) 508 Magnetic disk ICs FBlock diagram BH6625FS 509 Magnetic disk ICs FPin descriptions and input / output circuits BH6625FS 510 Magnetic disk ICs BH6625FS 511 Magnetic disk ICs BH6625FS 512 Magnetic disk ICs BH6625FS 513 Magnetic disk ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 5V) Supply current BH6625FS Low level voltage detection circuit Recovery time 514 Magnetic disk ICs Preamplifier BH6625FS Preamplifier / L.P.F / differentiator (B.P.F) 515 Magnetic disk ICs Write circuit BH6625FS Erase output Logic input 516 Magnetic disk ICs FRead characteristics BH6625FS Total filter peak frequency setting f0 = a / (RRCC [kΩ] +0.09) [kHz] FILC “H” a =...