2ch. Read/Write Amplifier Thin Film Head Hard Disk Drive Descript

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2ch. Read/Write Amplifier Thin Film Head Hard Disk Drive Descript

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CXA3188N
2ch. Read/Write Amplifier Thin Film Head Hard Disk Drive
Description CXA3188N Read/Write Amplifier thin film head hard disk drive designed handle channel heads. Features Operate single power supply power consumption Read Write Idle Designed terminal thin-film heads. Read amplifier emitter follower output featuring times gain(typ). Differential input capacitance Read (typ) Input noise 0.47 (typ) Write current range Differential Head voltage swing Vp-p (typ) Differential P-ECL write data input. Built-in write unsafe detection circuit. Built-in Servo write function. Read data outputs high impedance write mode. Unselected head voltage high impedance. Self switching damping resistor Built-in supply voltage monitor circuit prohibits incorrect write during power abnormal voltage. Function Read, Write Write unsafe detection HDD, power supply ON/OFF detection. Structure Bipolar silicon monolithic SSOP (Plastic)
Absolute Maximum Ratings (Ta=25 Supply voltage Operating temperature Topr Storage temperature Tstg +150 Allowable power dissipation board) Write current WUS/SE input current ISEH Operating Conditions Supply voltage
5±0.5
Sony reserves right change products specifications without prior notice. This information does convey license implication otherwise under patents other right. Application circuits shown, any, typical examples illustrating operation devices. Sony cannot assume responsibility problems arising these circuits.
E98128-TE
CXA3188N
Block Diagram Configuration
MODE CONTROL
DRIVER
WRITE CURRENT SOURCE
DRIVER
POWER ON/OFF DETECTOR
HEAD SELECT
WUS/SE
WRITE UNSAFE DETECTOR
CXA3188N
Description Symbol
Equivalent circuit
Description
Head. channels provided.
100k
power supply.
WUS/SE
Write unsafe detection output Servo Enable signal input.
Differential P-ECL write data input.
CXA3188N
Symbol
Equivalent circuit
Description
Head select signal input. "Low" Head0 "High" Head1
180k 2.1V
Read amplifier output.
2.5V
setting resistor write current value connected between this GND.
180k
Read/Write signal input. "High" Read "Low" Write
2.1V
Power save signal input "High" Power saving.
100k 2.1V
CXA3188N
Electrical Characteristics Item Current consumption read Current consumption write Current consumption idle Digital input "Low" input voltage Digital input "High" input voltage Digital input "Low" input current Digital input "High" input current Write data input current Write data input voltage range input amplitude Power supply ON/OFF detector threshold voltage Write current setting range Write current voltage Write current gain Write current setting constant Write unsafe output leak current Write unsafe output voltage WUS/SE input current WUS/SE High input voltage
(Unless otherwise specified, VCC=5 Ta=25 Write current IW=20 Symbol ICCR ICCW ICCI VWDV VWDA IWUS VWUSL ISEH VSEH Output current: Servo write Enabled Servo write Enabled +1.5 IW=AW VWC/RWC When write current "Iw[mA]", IW=KW/RWC. (RWC=3.3 VCC-2.5 2.25 -100 2.75 +1.6 IW=20 Test condition Min. Typ. Max. Unit. mAo-p mA/mA
applied voltage: applied voltage:
CXA3188N
Item Read amplifier differential voltage gain
Symbol
Test condition Input voltage:1 mVp-p,300 load resistor: (RDX, RDY) Frequency which lower Frequency which lower Head impedance: Common input voltage: mVp-p, Ripple voltage: mVp-p, Selected head input voltage: mVp-p Unselected head input voltage: mVp-p,
Min.
Typ. 0.47
Max.
Unit.
Frequency band width Input referred noise voltage Common mode rejection ratio Supply voltage rejection ratio CMRR PSRR
0.65
Channel Separation
Read data output offset voltage Read RDX, common mode output voltage difference between modes RDX, common mode output voltage Read
VOFF Vdiff CRD=0.1
-300 -300 -2.3
CXA3188N
Unless otherwise specified, VCC=5 Ta=25 (Write data frequency) MHz, IW=15 (Head inductance) (Head resistance value)
Item Head differential voltage amplitude Mode switching time Read Write
Symbol
Measurement conditions Differential voltage between switching Write current time required Write current turn
Min.
Typ.
Max.
Unit.
Vp-p
TWR1 Mode switching time Write Read TWR2 Mode switching time Power saving Read Mode switching time safe unsafe Mode switching time unsafe safe
TSA1
TSA2
Head switching time Write current propagation delay time Write current rise/fall time
after changes from "High" "Low". TWR1 time required Read amplifier output turn after changes from "Low" "High". TWR2 time required Write current decreases after changes from "Low" "High". time required Read amplifier output turn after changes from "High" "Low". TSA1 time required turn "High" after last transition Write data when Write data stopped Write mode. TSA2 time required turn "Low" after first transition Write data Write mode. time required Read amplifier output reach when selected head switched Read mode. time required Write current reach after Write data falling edge. time required Write current reach from same time required reach from LH=0 RH=0
0.13
TR/TF
Read amplifier output mVp-p
CXA3188N
Test Circuit
15MHz
2.7k
5.1k 0.1µ 0.1µ 0.1µ
Fig. Test Circuit
2.7k
5.1k
Fig.
CXA3188N
Timing Chart
TWR1
Fig. Timing Chart
TSA1
TSA2
Fig.
CXA3188N
Description Functions Read amplifier This noise amplifier amplifying signals from heads with emitter follower output. outputs differential amplifier, side head input side head inputs have same polarity. Write circuit Write data input passes through buffer amp. drives Write switch circuit which supplies Write current heads. Write current flows into side when "Low" "High". Mode control mode shown Table WUS/SE. WUS/SE Table Mode selection
Mode Write Read Servo Write Power Save
Servo write mode This mode allows writing multiple channels once. this mode write driver will drive channels simultaneously. enable servo write mode follow these steps: Place device Read mode. WUS/SE VSEH volts, input ISEH WUS/SE. Initiate write operation setting Low. Write unsafe detection circuit This circuit detects write errors. normal Write mode, output low; conditions listed below, high. Head input open (under condition which Write data frequency MHz) Head input shorted VCC. Write data frequency abnormally low. Write current. read mode. Supply voltage abnormal (see "power supply ON/OFF detection"). Power supply ON/OFF detection This circuit monitors detect erroneous Writes. error status established when falls below threshold voltage (VTH) power supply ON/OFF detector, which case recording playback functions prohibited. When rises above, VTH, prohibition these functions released.
-10-
CXA3188N
Application Circuit
2.7k
5.1k
Application circuits shown typical examples illustrating operation devices. Sony cannot assume responsibility problems arising these circuits infringement third party patent other right same.
-11-
CXA3188N
Notes operation This device handles high frequency high gain signals. Please note following; Connect decoupling capacitor approximately 1000 near device. Make area large possible. constant voltage pin. When noise affects this pin, creates noise Write current. Therefore, locate close device possible. Write unsafe detection circuit This circuit uses voltage waveforms head pins detection.
Wave form write data
Voltage waveform head pins (HX,
VTH=1.4V
must more than When possible that Write unsafe detection maximum frequency becomes more than MHz. normal operating area write unsafe detection circuit changed head inductance, head resistance, write current other.
-12-
CXA3188N
Application Notes following characteristics reference Item Differential output capacitance Differential output resistance Differential input capacitance Read mode Differential input resistance Output resistance Unselected head differential current write mode Write mode Write current symmetry TAS=T1-T2 Symbol TASY Condition Between head input pins Between head input pins f=5MHz RDY, f=5MHz LH=2 RH=30 IW=15 LH=0 RH=0 IW=15
VCC=5 Ta=25 Min. Typ. Max. Unit
mAp-p -0.5
IWX+IWY
Setting Write current Write current with resistor IW=K/RWC (mA) Refer Fig.
Write current
Write current setting constant Write current
Write current setting constant
VCC=5V Ta=25°C
Write current (mA)
52.5
47.5
Write current (mA)
Fig. -13-
Fig.
CXA3188N
Normalized read amplifier voltage gain Supply voltage 1.04 Ta=25°C 1.04
Normalized read amplifier voltage gain Ambient temperature VCC=5V
AV/AV (Ta=25°C)
AV/AV (Ta=25°C)
1.02
1.02
0.98
0.98
0.96
0.96
Supply voltage
Ambient temperature (°C)
Normalized write current Supply voltage 1.04 Ta=25°C RWC=24k 1.02
Normalized write current Ambient temperature VCC=5V RWC=2.4k
IW/IW (Ta=25°C)
IW/IW (VCC=5V)
1.02
0.98
0.96
0.98
Supply voltage
Ambient temperature (°C)
-14-
CXA3188N
Input referred noise voltage Supply voltage Ta=25°C 0.49 0.55
Input referred noise voltage Ambient temperature VCC=5V
(Ta=25°C) (mV/
(VCC=5V) (mV/
0.47
0.45
0.45
Supply voltage Power supply ON/OFF detector threshold voltage Ambient temperature
Ambient temperature (°C)
Power supply ON/OFF detector Threshold Voltage
Ambient temperature (°C)
-15-
CXA3188N
Package Outline
Unit
16PIN SSOP (PLASTIC)
1.25
0.65 0.05 0.15 0.02
0.22 0.05
0.13
DETAIL NOTE: Dimension does include mold protrusion.
PACKAGE STRUCTURE
PACKAGE MATERIAL SONY CODE EIAJ CODE JEDEC CODE SSOP-16P-L01 SSOP016-P-0044 LEAD TREATMENT LEAD MATERIAL PACKAGE MASS EPOXY RESIN SOLDER PALLADIUM PLATING 42/COPPER ALLOY 0.1g
NOTE PALLADIUM PLATING This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame).
-16-
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2ch. Read/Write Amplifier Thin Film Head Hard Disk Drive Descript

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