MB4107 Datasheet | Fujitsu Semiconductor Limited

'11111111111111111111111111111111111111111111111111111111111111111 FUJITSU MB 4107 FLOPPY DISK VFO October 1964 Edition 1.0 The Fujitsu MB 4107 is a variable-frequency oscillator (VFO) Ie for use in floppy-disk interfaces_ It provides a plete data separation function, with a minimum of external parts and no adjustments, and can be used with a variety of disk controllers_ It locks onto the read signal from the disk drive, which normally has jitter due to rotation speed variations and peak shifting, and produces a stable read signal for the controller_ It also produces a window signal, which can be used to differentiate the clock and data pulses in the read signal. The MB 4107 includes functions for sync field detection, automatic loop filter gain switching, and address and index mark detection_ - The analog VFO (PLL) circuitry allows a wide read margin for the data separator. - Can be connected to both 8-inch and 5-inch floppy disk drives using the same external ponents. - Handless both double-density (MFM) and single-density (FM) disks_ - Can be used with various flop1y disk controllers such as the MB 8876A, MB 8877A, FD1791, and MPD 765. - The discrimination function for gap and sync fields prevents incorrect locking on the gap field. - The quick sync function (high gain) in the sync field is automatically switched to the stable tracking function (low gain). - Because the sync pattern detector (data: OOH, clock: FFH ) and the IBM format mark detector control PLL gain, the index, 10, and data fields can be locked onto without special control signals_ - A master clock is generated for the floppy disk controller, to prevent spikes when switching between 8- and 5-inch floppy disks_ - External circuitry requires very few ponents, and no adjustments. Internal clock: 7 resistors,5 capacitor,1 crystal or ceramic resonator External clock: 5 resistors, 3 capacitors Fig. 1 - BLOCK...