MA16688MP

MA16688MP HITACHI | Alldatasheet

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Features

+ Two-power supply design (+5 V and +12 V) + Easily extendable for systems with more than 8 channels + Low noise read amplifier has differential gain of 200 (typ) Pin Assignment + Emitter-follower fixed current read amplifier output + Write current can be selected by an extemal resistor en aw 2 8 + Built-in power supply monitor for both 5 V and 12 V ge prevents incorrect writes uedfe "7 FSFE R LL + TTL-compatible interface sxe O Bate + Compact surface-mount package herd] & ~ 37 BWCGND + Symmetrical arrangement of head input/output and isi * ood controller signal/pins ave] 1 ue buso Block Diagram wane] 12 33 Pasi nave] 13 32 base Par woe] 14 is - eens Oo Ota voxels 3 wor od sve 6 25 bwus G ' NH, wg ew we eiB POGNO 0 ' SoU yoy “8 3 wo (he - Om Top View 4 ' _ 8) pa wet \\ a fee ~ “Om | oe —- ‘ Ordering Information | ] Ow Type No. Package ty i HAT6688MP MP 44 freee H 1 I | E=|-=I- — wd Fl Ors | vr) Po Ors: | ms |=" wre deve over ‘ ver SH ' Qo 9-9-9-9-! OTR tate ce @ HITACHI Hitachi America, Ltd. Hitachi Plaza © 2000 Sierra Point Pkwy. + Brisbane, CA 94005-1819 + (415) 589-8300 291

Symbol PinNo. Name Function ROX ‘35 Read amplifier output Differential output for a pre-amplifer. Quiputs amplilied read signal from the ROY 36 head coi RW 30 RW select Selects head coil bias for read/write. When FIW is low, write mode is selected; when it is high, read mode is selected. cn) 4 Chip disable. CD input can be used as a chip select for systems requiring more than 8 channels. CO low selects the chip, CD high disables it vet 23 Center tap voltage output Head center tap voltage output. In write mode, outputs a current proportional to write current. RCT 24 Power supply for center tap Power consumption can be reduced by connecting RCT to Vi2 through a 130 0 (1/2 W) resistor. When power consumption is not a concem , RCT can be tied directly to V12. HsO 34s HeadselectO Head select signal inputs. Select rom head channels 0 10 7 (see table 1). HSs1 3 Head select 1 Hs2 32 Head solect 2 HOX,HOY 1,2 Head OX, oY Channel 0 head coll inpuvoutput HIXHIY 4,5 Head ix, 1¥ Channel 1 head col inpuvoutput HeX,H2Y 7,8 Head 2X, 2¥ Channel 2 head coil inpuvoutput HOX,H3Y 10,11 Head 3X, Y ‘Channel 3 head coll inpuVoutput HaX,H4Y 12,13 Hoad 4X, 4Y ~__ Channel 4 head oll inpuvoutput HBX,HSY 15,16 Head SX, 5Y Channel 5 head coll inpuvoutput HEX, HEY 18,19 Head 6X, 6Y ‘Channel 6 head coil inpuvoutput. HIX,H7Y 21,22 Head 7X, 7¥ ‘Channel 7 head coll inpuvoutput. wo 38 Write current select Tho write current can be selected by connecting resistor Ryo between WC ‘and GND: WRITE CURRENT = K/Rwc [A] ‘WO Ky Write data input ‘The write data signal trequency is divided by two, then fed to a write driver. wus 2 Write fault detector output WUS goes high when a write fault is detected. WUS will go high if: 1, Head coil is shorted to ground or open-circuited 2. Center tap is open-circuited 3. WDi input frequency is t00 low 4. There is no write current 5. Chip is in read mode 6. Chip is not selected vs 315 V power supply Digital power supply. viz 2612 V power supply ‘Analog power supply. HGND “4 Head ground Ground for head coil inpuvoutputs. ‘AGND “1 ‘Analog ground ‘Analog ground. Z OGND 28 Digital ground Digital ground. WCGND 37 WC ground ‘Ground for fixed write current source — @HITACHI 292 Hitachi America, Ltd. * Hitachi Plaza * 2000 Sierra Point Pkwy. * Brisbane, CA 94005-1819 © (415) 589-8300

a HA16688MP atch Absolute Maximum Ratings (Ta = 25°C) Parameter Symbol Rating _Unit__Pins Digital power supply vs 60 Vv VS ‘Analog power supply vi2 140 OV v2 a Write current w 60 «mA ~ ‘input voltage Vin “03t0V5+03 OV HS0, HS1, HS2, WD, AW, CD WUS voltage ~__Ywus 40 VV (WUS WUS output current 'wus. 12 mA ___WUS Center tap output current lop 60 «mA CVC Read data output current__Iro “40 mA_~RDX, ROY a Head voltage Vn =031014 -V__-HOX, HOY toH7X, H7Y Operating temperature Topr ~Ots70 oO ‘Storage temperature Tota “5510+125 Cc _ _ “The absolute maximum ratings are limiting values, to be applied individually, beyond which the device may be permanently damages. Functional operation under any of these conditions fs not guaranteed. Exposing a citcut to its absolute maximum raling for extended penods of ime may affect the device's reliability Electrical Characteristics (V12 = 12 V, VS =5 V, Ta = 25°C, unless otherwise specified) Power Supply Parameter Symbol Min Typ Max Unit Test Conditions Power supply voltage vs 45. 50 55 Vv ~ viz 108 120 132 Vv —

45 V power supply current Is -— = 25 mA Read mode

15 = 30-mA Write mode 15 = 20. «mA Wdemode 712 V power supply current. 1 = 35-mA ‘Read mode he — = 2+lw mA Wrilemode he == 2 mA Idle mode Digital Inputs Parameter Symbol Min Typ Max __Unit'_TestConditions _ Input low voltage vi 03 — 08 v oo input ow current We =400 — — —WA__‘Viy = 0.8 V (applies to WO) 00 WA Vi =0.8 V (applies to HSO, HS1, HS2. CD. and /W) Input high voltage Via 20 — VS+oa Vv | Input high current tH 100A y= 2.0 a Readrite transition time thw = — 600 ns __R/W10 90% VCT wite voltage Write/read transition ime twr = — 00 —ns__-RIW10 90% VOT read voltage Head select delay ‘hs = — _600___ns__-Readorwrito mode Chip disable delay tow — = 600 __—ns__RIWioldleor idle to RW. Write Fault Detector Parameter Symbol__Min Typ Mex _Unit__Test Conditions US low voltage Vou — — 05 Vlg 8mA US igh current lon =~ 100A =50V0s—sS—~—S Faulttono-fault delay ty =~ — 10 4s No-faulttofauitdelay yy SOS @HITACHI Hitachi America, Ltd. ¢ Hitachi Plaza 2000 Sierra Point Pkwy. * Brisbane, CA 94005-1819 * (415) 589-8300 293

Parameter Symbol Min Typ Max_ Unit Test Conditions Differential voltage gain Avd 170 “200 230 ” WW f= 300 kHz ~ Bandwidth (3 48) Bw - » — ‘MHz ~ Inputnoise volage Vn — 15 — AV: _1'5 15 MHz, Input shoned — Input bias current tb = = 3s WA Read mode Common mode rejection ratio. + CMAR 60S dB Ving) = VCT + 100 my, 0068, t= § MHz oP ‘Supply voltage rejection ratio PSRR- 45 - - oB ‘V5, V12 + 100 Mp. t=5MHz ‘Channel separation Sep 45 - - 3B Vin = 100 mV__, on unselected channels and Vin = 0 "ep ‘on selected channel f= 1MHz Output offset voltage Vo 600 — ~—00 mv Input shorted Differential input impedance Rin 80 155 = ~ kQ f = 300 kHz ~ Rin - 08 - kQ f= 5 MHz Common mode output voltage Vogm 506075 Vv — ~ Output source current lonp 10 mA Output sink current losap,— 1522 mA — 7 Write Drivers Parameter Symbol Min Typ Max Unit Test Conditions ‘Write current select range Ww 10 — 50 mA lw-Lhead > 200 mA wH Head current rise time Thex _- - 20 ns Lh =O pH, Rh = 09, 10% to 90% point delay time From 50% point Head current switching symmetry Td4 = 2 ns WDi duty cycle = 50% — Rise/fall time = 1 ns WDI minimum input frequency Fy «125 SO = kHz WUS= Low _ —_ Head current gain Wwe OO Head currentiwe VCT output voltage: ~ ver 38 43°~«50 V___ Read mode id = -35 pA VCT 5.0 60 66 v Write mode lwo = —45 mA Write current select coetficient_K 131 140149 v ” eee Table 1 Head Select Table 2 Mode Select low Low Low 0 low Low Wie tow Low-High 1 ~ Low "High Read Low High Low 2 High tow Ide Low High High 3 High ‘High ide High Low Low 4 High Low. High : 5 High High Low 6 High High High 7 @ HITACHI 294 Hitachi America, Ltd. ¢ Hitachi Plaza © 2000 Sierra Point Pkwy. « Brisbane, CA 94005-1819 © (415) 589-8300

a TOOBIN Circuit Example Notes ver O ween] et tl xo act wees {] nov 7 ettt col} at wel Ee Mek RL y Waveform Cd TL ier ox PORE ean CJ nsx rw} Wer - aR _ | ry ov 50, - 450 interface ett us [} ns) PPT IC q wey 4s? p nse Hareeee wor WOATE Out x { vst } +S 10m BY sr] “ee 3 ote CTT vcr newof} 4 | 1. The resistance of Rwc is determined by - 140 (typ) Rw [kal = Wiite current [ma] Placing Rye close to WC will reduce write current nnging when switching between reading and writing 2. The longer these contacts are, the greater the tendency for RDX and ADY to oscillate. Oscillation can be reduced by inserting the series resistors right next to the ROX and RDY pins. 3. RCT reduces current consumption in write mode. 4. Ferrite leads (or a LR filter) reduce write current overshoot and ringing when the VCT contacts are long @ HITACHI! Hitachi America, Ltd. ¢ Hitachi Plaza © 2000 Sierra Point Pkwy. © Brisbane, CA 94005-1819 © (415) 589-8300 295