Read /Write amplifier for FDD
Magnetic disk ICs
Read / Write amplifier for FDD
BH6626FS
The BH6626FS is a read / write IC designed for floppy disk dr...
Description
Magnetic disk ICs
Read / Write amplifier for FDD
BH6626FS
The BH6626FS is a read / write IC designed for floppy disk drives and has an internal active filter for memory systems in which saddle margins are important. Any of multiple write current settings can be selected, and both density switching and inner track / outer track switching are done internally.
FApplications Floppy disc drives (1MB and 2MB)
FFeatures 1) Active filter switched internally. 2) Time domain filter with internal switch set according to transfer rate.
3) Density switching and inner track / outer track switching are done internally.
FAbsolute maximum ratings (unless otherwise noted, Ta = 25_C)
FRecommended operating conditions
522
Magnetic disk ICs
FBlock diagram
BH6626FS
523
Magnetic disk ICs
FPin descriptions and Input / output circuits
BH6626FS
524
Magnetic disk ICs
BH6626FS
525
Magnetic disk ICs
BH6626FS
526
Magnetic disk ICs
BH6626FS
FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 5V) Supply current
527
Magnetic disk ICs
Low level voltage detection circuit
BH6626FS
Recovery time
Preamplifier
528
Magnetic disk ICs
Preamplifier / L.P.F / differentiator (B.P.F)
BH6626FS
Comparator and waveform shaping
Write circuit
529
Magnetic disk ICs
Erase output
BH6626FS
Logic input
FMode table
Total filter peak frequency setting f0 = a / (RRCC [kΩ] +0.09) [kHz] a= 412 1M outer track 439 1M inner track 790 2M outer track 867 2M inner track 732 outer track(...
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