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BH6628AFS

Rohm
Part Number BH6628AFS
Manufacturer Rohm
Description Read / Write amplifier for FDD
Published Mar 23, 2005
Detailed Description Magnetic disk ICs Read / Write amplifier for FDD BH6628AFS The BH6628AFS is a 4-mode read / write IC designed for flopp...
Datasheet PDF File BH6628AFS PDF File

BH6628AFS
BH6628AFS

Overview
Magnetic disk ICs Read / Write amplifier for FDD BH6628AFS The BH6628AFS 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 (Ta = 25_C) FRecommended operating conditions (Ta = 25_C) 549 Magnetic disk ICs FBlock diagram BH6628AFS 550 Magnetic disk ICs FPin descriptions and input/output circuits BH6628AFS 551 Magnetic disk ICs BH6628AFS 552 Magnetic disk ICs BH6628AFS 553 Magnetic disk ICs BH6628AFS 554 Magnetic disk ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 5V) BH6628AFS 555 Magnetic disk ICs BH6628AFS 556 Magnetic disk ICs BH6628AFS 557 Magnetic disk ICs FRead characteristics BH6628AFS Total filter peak frequency setting f0 = a / (RRCC [kΩ] +0.
09) [kHz] FILC “H” a = 351 380 420 451 729 842 729 780 “OPEN” 318 353 378 416 694 807 729 786 “L” 351 380 420 451 729 842 729 786 250 [kbps] outer track 250 [kbps] inner track 300 [kbps] outer track 300 [kbps] inner track 500 [kbps] outer track (when F2 = H) 500 [kbps] inner track (when F2 = H) 500 [kbps] outer track (when F2 = L) 500 [kbps] inner track (when F2 = L) TDF time constant setting 250 [kbps] : T = 796 300 [kbps] : T = 614 500 [kbps] : T = 331 RRCC [kΩ] +607 [ns] RRCC [kΩ] +552 [ns] RRCC [kΩ] +448 [ns] FWrite current switching ratio (Write current setting) Iwr = 24.
0 RWCC [kΩ] [mA] 558 Magnetic disk ICs FFilter characteristic BH6628AFS 559 Magnetic disk ICs FMeasurement circuit ...


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