ASSP Magnetic Disk BIPOLAR Read/Write Amplifier (For Th

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ASSP Magnetic Disk BIPOLAR Read/Write Amplifier (For Th

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DS04-25210-2E
ASSP Magnetic Disk
BIPOLAR
Read/Write Amplifier
(For Thin Film Composite Heads, Channels)
MB4138
DESCRIPTION
MB4138 6-channel read/write amplifier magneto-resistive (MR) inductive thin film composite heads used hard disk drives.
FEATURES
Drives thin film composite heads. bias current head range (DC). read signal from head directly connected internal differential amplifier. High gain noise (0.51 read amplifier Read amplifier output buffer type: open collector. Voltage output function heads (VHR) ground fault protection function Read output voltage stabilization mode switching Psuedo-ECL level differential input write data write current range from (DC). Internal write-unsafe detect circuit. Detects write head faults. level control inputs Internal voltage monitor detects supply voltage Operates single +5.0V power supply.
PACKAGE
pin, Plastic
(FPT-48P-M13)
MB4138
ASSIGNMENT
(TOP VIEW)
(NC)
(FPT-48P-M13)
MB4138
DESCRIPTION
Symbol W0X, R0X, W1X, R1X, W5X, R5X, HS0, HS1, Description Chip select pin. Control signal input pin. Sets operating idle state. level input sets "operating". Read/write mode selection Output head voltage function. Outputs same voltage bias voltage heads. Head connection pins channels Pins W0X, W0Y, etc. thin film write heads each channel. Pins R0X, R0Y, etc. read heads each channel. head bias current flows from pin. read signals input differential amplifier. Capacitor connection pins. 0.033 capacitor typically connected between these pins. capacitor cuts component that occurs when bias current flows through head. Ground pin. Connect ground. Capacitor connection pins. Connect 0.033 capacitor between these pins. capacitor cuts component bias current flowing through heads. Capacitor connection pin. Connect capacitor between this ground. capacitor stabilizes current source circuit reduces noise. ON/OFF switching head bias current write mode. Normally this level (bias current reduce duration transient when switching from write mode read mode. Resistor connection setting write current. Resistor connection setting head bias current. Differential amplifier output pins read data. output opencollector type, connect 100W resistors between each these pins VCC. Write fault detect pin. Outputs level when write fault occurs. output open-collector type, connect pull-up resistor. Write data differential input pins. input level pseudo-ECL. Input differential signals these pins. Ground pin. Connect ground. Power supply pin. Connect +5.0V supply. Capacitor connection pin. Connect capacitor between this VCC. capacitor stabilizes current source circuit reduces noise. Channel head select pins. Functions" section decoding logic. input level TTL.
MB4138
BLOCK DIAGRAM
Read buffer amp.
Write transition detect circuit
head potential generation circuit
ch-0
Read pre-amp.
Write pre-driver Write driver
Head select circuit
Transition amp.
Read/write select circuit
ch-5
Read select circuit Chip select circuit Reference voltage generator circuit Power supply monitoring circuit Write current source circuit
Read pre-amp.
Write driver
Transition amp.
head current source circuit
MB4138
ABSOLUTE MAXIMUM RATINGS
Parameter Power supply voltage Digital input voltage Head input voltage RDX, output voltage output voltage output current Write current head bias current Storage temperature Symbol VHEAD VRDX, VRDY Tstg Rating Min. -0.3 -0.3 -0.3 -0.3 -0.3 Max. +7.0 +0.3 +0.3 +0.3 +0.3 +125 Unit WDX/Y, R/W, Remarks
RECOMMENDED OPERATING CONDITIONS
Parameter Power supply voltage Write current Write current setting resistor head bias current head resistor head current setting resistor Voltage between headpins Operating temperature range Symbol Values Min. 4.50 Max. 5.50 7.5k Unit VMR=I 5.0V Remarks
MB4138
ELECTRICAL CHARACTERISTICS
Characteristics
(Unless otherwise specified, =5.0V 10%, Ta=+25°C, head resistance RMR=36, thin film head Lh=240 Rh=15, C1=0.1 C2=0.1 C3=0.033 C4=0.033 Values Symbol Condition Mode Unit Remarks Min. Typ. Max. Power supply current CCW1 CCW2 Power consumption
Operating voltages supply voltage monitoring
Parameter
RRC=4.3 RRC=4.3 RS=H, RWC=32 RS=L, RWC=32 RRC=4.3 RRC=4.3 RRC=4.3 RWC=32 RWC=32, RRC=4.3k falling rising VTHH VTHL High level level
I/R/W
3.45 3.45 Vcc-1.02 Vcc-1.9 -0.3 -250 -130 34.3 0.88
27.5 3.90 4.10 -120 36.5 1.00
37.5 4.30 4.46 Vcc-0.5 VWDX, YH-0.25 38.7 1.12
VTHL VTHH VWDX, VWDX,
Hysteresis width WDX, input voltage range
WDX, input VWDX, VWDX, VWDX, voltage difference input voltage range WDX, input current input current R/W, input current Read head input current Read head current nonselected heads head current constant voltage IWDX IWDY IR/W IHRF High level level VWDX, Y=VCC/-0.3V VWDX, Y=VCC VHS0 2=VCC VHS0 2=-0.3V VCS, R/W, RS=VCC VCS, R/W, RS=-0.3V RRC=4.3
(Continued)
MB4138
(Continued)
Parameter RDX, output current RDX, output offset Selected read head voltage Non-selected read head voltage voltage Read head voltage difference C3X, read current Write head input current Write head current nonselected heads Write current constant voltage Head clip voltage Head clip voltage difference output current Symbol IRDX, VOFF VRSH Condition VOFF=V RRC=4.3 Mode R/W2 Values Min. -300 Typ. VCC-1.5 Max. Unit Remarks High potential side
VRUS VVHR
RRC=4.3 RRC=4.3 VHR=|
I/R/W I/R/W R/W2
0.93 0.93
VCC-3.0 VCC-1.5 0.98 1.05
1.05 1.17
IC3X, VC3X, Y=3V IHWF VWC1 VWC2 VCL1, RWC=32 IWUS VHR=| VCL1 VCL2 RWUS=1 RWC=32
MB4138
Characteristics
(Unless otherwise specified, =5.0V±10%, Ta=+25°C, head resistance RMR=36, thin film head Lh=240 Rh=15, C1=0.1 C2=0.1 C3=0.033 C4=0.033 Parameter Differential voltage gain Frequency bandwidth Input capacitance Input conversion noise voltage Input dynamic range Common mode rejection ratio Power supply rejection ratio Channel separation Symbol CMRR PSRR tdIR delay tdRI tdIW tdWI Condition Vin=1mVpp, fin=5 Vin=1mVpp, BW=1 30MHz, short fin=5 MHz, 3fin=- Vin=100 mVpp, fin=5 Vin=100 mVpp, fin=5 Vin=100 mVpp, fin=5 RRC=4.3 RRC=4.3 RWC=24 RWC=24 RRC=4.3 RMR=36, RS=H tdWRR RRC=4.3 RMR=36, RS=L delay RRC=3.0 RMR=53, RS=L tdRWR RRC=4.3 tdRWW RWC=24 tdWRW RWC=24 delay tdW12 tdW21 tdHSR RRC=4.3 RRC=4.3 RMR=30 head switching) fWDX, fWDX, Y=20 RWC=24, Lh=240 Rh=15 Mode W1W2 W2W1 Values Min. Typ. 0.51 Max. 0.69 Unit mVpp tWG=1ms write time Remarks RL=100 RL=100
delay
tdHSW RWC=24 delay Write current transition time Transition time difference tdSF tdUS tr1/tf1
(Continued)
MB4138
(Continued)
Parameter Write current delay Delay time difference Write data input frequency output voltage output current Symbol tpd1, Condition RWC=24, Lh=240 Rh=15 tpd1 tpd2 Mode Values Min. Typ. Max. 31.5 Unit Remarks IW=40mA
fWDX, RWC=24, Lh=240nH, Rh=15 VUSL fWDX, Y=2MHz, IWUS=5mA fWDX, Y=0MHz, Rh=15 IUSH fWDX, Y=9MHz, Write head open
MB4138
FUNCTIONS
Mode Selection
Operation Mode Idle Read Write (W1) Write (W2) Bias Current Voltage Voltage Voltage
Head Selection
Head
(Write Unsafe) Output Truth Table
Operation mode Idle Read Conditions Normal Write When more following faults present: Write data frequency low. Write head open (fWD< 9MHz). write current, current low.
MB4138
OPERATION
Read Mode
read mode, MB4138 operates noise differential amplifier. bias current (sense current) flows through head from pin. head bias current (IR) determined head current constant (KR) resistance (RRC) connected between pin. current calculated follows. =KR/RRC pins connected directly bias current circuit bases opposite transistors differential amplifier circuit (read amp). Therefore, differential amplification read signal from head performed directly. emitters opposite transistors differential amplifier circuit require capacitive coupling component generated head resistance bias current. (Connect 0.033 capacitors across C4Y). open-collector output pins read buffer circuit. RDX, have same phase. output voltages (DC) almost same write read modes. This reduces transient time when switching from write read mode. Connect capacitors across stabilize current source circuit head bias current. modes, outputs same voltage channel selected read mode. potential difference between head disk eliminated biasing disk with this voltage.
Write Mode
write mode, MB4138 switches current through thin film head (Ih) high speed. write current (IW) determined write current constant (KW) resistance connected between ground (RWC). currents calculated follows. VWC/RWC 0.99 Rh/Rd Thin film head resistance internal damping resistance write fault detection circuit detects abnormalities thin film head connection pins (WiX WiY). circuit generates alarm detecting fault. Normally, bias current flows head during write mode. However, reduce transient time when switching from write read mode, bias current flowed setting level. KW/RWC
Idle Mode
Neither read write circuits operate idle mode. However, continues operate output voltage idle mode.
MB4138
TIMING CHART
Delay
tdIR 125/75% tdRI
RDX-RDY
100%* 75/125% tdIW
tdWI
Where 5MHz, 50mVpp signal output 100%.
Delay
tdWRR 125/75% tdRWR
RDX-RDY
100%* 75/125% tdRWW
tdWRW
Where 5MHz, 50mVpp signal output 100%.
Delay
tdW12
tdW21
MB4138
Delay
tdHSR 125/75% 100%* 75/125% tdHSW
RDX-RDY
tdHSW
Where 5MHz, 50mVpp signal output 100%.
Delay
(=WDY)
tdUS tdSU
Write Current Transition Time, Write Current Delay
(=WDY)
tpd1 tpd2
MB4138
APPLICATION CIRCUIT EXAMPLE
0.033µ
0.033µ
Write unsafe
0.1µ
0.1µ
Read data
0.01µ
Read data
0.01µ
0.1µ
Write data Write data Head select Head select Head select Read/write Chip select
MB4138
(=1.0
(=1.0
MB4138
ORDERING INFORMATION
Part Number MB4138PFQ Package 48-pin, Plastic (FPT-48P-M13) Remarks
MB4138
PACKAGE DIMENSION
48-pin, Plastic (FPT-48P-M13)
13.10±0.40 (.516±.016) 10.00±0.20 (.394±.008)
2.35(.093)MAX 0(0)MIN (STAND OFF)
Details part 0.15(.006) 8.80 (.346)
11.50±0.30 (.453±.012)
0.20(.008) 0.18(.007)MAX 0.53(.021)MAX
INDEX
Details part LEAD
0.80(.0315)TYP
0.30±0.10 (.012±.004)
0.16(.006)
0.15±0.05 (.006±.002) 0~10° 0.80±0.30 (.031±.012)
0.10(.004)
1994 FUJITSU LIMITED F48023S-1C-1
Dimensions (inch).
MB4138
FUJITSU LIMITED
further information please contact:
Japan FUJITSU LIMITED Corporate Global Business Support Division Electronic Devices KAWASAKI PLANT, 4-1-1, Kamikodanaka Nakahara-ku, Kawasaki-shi Kanagawa 211-88, Japan Tel: (044) 754-3753 Fax: (044) 754-3329 North South America FUJITSU MICROELECTRONICS, INC. Semiconductor Division 3545 North First Street Jose, 95134-1804, U.S.A. Tel: (408) 922-9000 Fax: (408) 432-9044/9045 Europe FUJITSU MIKROELEKTRONIK GmbH Siebenstein 6-10 63303 Dreieich-Buchschlag Germany Tel: (06103) 690-0 Fax: (06103) 690-122 Asia Pacific FUJITSU MICROELECTRONICS ASIA PTE. LIMITED #05-08, Lorong Chuan Tech Park Singapore 556741 Tel: (65) 0770 Fax: (65) 0220
Rights Reserved. contents this document subject change without notice. Customers advised consult with FUJITSU sales representatives before ordering. information circuit diagrams this document presented examples semiconductor device applications, intended incorporated devices actual use. Also, FUJITSU unable assume responsibility infringement patent rights other rights third parties arising from this information circuit diagrams. FUJITSU semiconductor devices intended standard applications (computers, office automation other office equipment, industrial, communications, measurement equipment, personal household devices, etc.). CAUTION: Customers considering products special applications where failure abnormal operation directly affect human lives cause physical injury property damage, where extremely high levels reliability demanded (such aerospace systems, atomic energy controls, floor repeaters, vehicle operating controls, medical devices life support, etc.) requested consult with FUJITSU sales representatives before such use. company will responsible damages arising from such without prior approval. semiconductor devices have inherently certain rate failure. must protect against injury, damage loss from such failures incorporating safety design measures into your facility equipment such redundancy, fire protection, prevention over-current levels other abnormal operating conditions. products described this document represent goods technologies subject certain restrictions export under Foreign Exchange Foreign Trade Control Japan, prior authorization Japanese government should required export those products from Japan.
F9703 FUJITSU LIMITED
Printed Japan

ASSP Magnetic Disk BIPOLAR Read/Write Amplifier (For Th

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