march 1995 description the ssi 32r2214rx is a bicmos monolithic integrated circuit designed for use with two-terminal recording heads. it provides a low noise read amplifier, write current control, and data protection circuitry for up to four channels. the ssi 32r2214rx has an internal 900 w damping resistor. the damping resistor is switched in during write mode and switched out during read mode. power supply fault protection is provided by disabling the write current generator during power sequencing. system write to read recovery time is significantly improved by making the read channel outputs high impedance. two guard pins are provided for maximum supply noise rejection. the device also offers multiple channel servo bank write capability to assist in servo writing operations. the ssi 32r2214rx requires only a +5v power supply. features ? +5v 10% supply ? low power - pd = 105 mw read mode (nom) - pd = 1.0 mw idle (max) ? high performance: - read mode gain = 300 v/v - input noise = 0.50 nv/ ? hz (nom) - input capacitance = 7 pf (nom) - write current range = 3-25 ma - nominal write current (20 ma) rise/fall time = 7.7 ns (nom) (typical head) - head voltage swing = 7.8 vpp (nom) ? servo bank-write capability ? self switching damping resistance ? write unsafe detection (continued) pin diagram read buffer q s mode select rdx rdy r/ w cs write unsafe detector gnd wus read preamps and write current switches (x6) q t wd i write current source wus/s voltage fault detector hs0 hs1 vcc reference voltage h0x h0y h1x h1y h2x h2y h4x h4y wc wdff hs2 h5y h3x h3y h5x wd block diagram ssi 32r2214rx +5v, 4-channel thin film read/write device 1 03/17/95 - rev caution: use handling procedures necessary for a static sensitive component. 32r2214rx 4 channels 3 4 6 7 9 10 19 18 16 15 22 21 h0x h0y h1y h3x h3y r/ w wc 520 rdy rdx hs0 817 h2y hs1 vcc h2x h1x 1 2 24 23 n/c guard gnd cs 11 12 14 13 guard n/c wd wd wus 24-lead, sol prototype free datasheet http:///
ssi 32r2214rx +5v, 4-channel thin film read/write device 2 features (continued) ? power supply fault protection ? head short to ground protection ? differential ecl-like write data inputs ? write data flip/flop
|
