4ch. Read/Write Amplifier Thin Film Head Hard Disk Drive Descript

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4ch. Read/Write Amplifier Thin Film Head Hard Disk Drive Descript

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CXA3172N
4ch. Read/Write Amplifier Thin Film Head Hard Disk Drive
Description CXA3172N 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) Rise Fall times (typ) (LH=540 RH=25 IW=10 Differential P-ECL write data input Built-in write unsafe detection circuit. Built-in Servo write function (2/4 ch). Built-in protection circuit short head GND. Read data outputs high impedance write mode. Unselected head voltage potential. Built-in supply voltage monitor circuit prohibits incorrect write during power abnormal voltage. Self switching damping resistance SSOP (Plastic)
Absolute Maximum Ratings (Ta=25 Supply voltage Write current mAo-p Operating temperature Topr Storage temperature Tstg +150 Allowable power dissipation WUS/SE input current ISEH
Recommended Operating Conditions Supply voltage V±10 Write current mAo-p
Function Read, Write Write unsafe detection HDD, power supply ON/OFF detection. Structure Bipolar silicon monolithic
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.
E96X38A7X-TE
CXA3172N
Block Diagram Configuration
MODE CONTROL
DRIVER
WRITE CURRENT SOURCE
DRIVER
DRIVER
HEAD SELECT
DRIVER
PROTECTOR
POWER ON/OFF DETECTOR
WRITE UNSAFE DETECTOR
WUS/SE
CXA3172N
Description Symbol
Equivalent circuit
Description
100k
Head. channels provided.
power supply.
WUS/SE
Write unsafe detection output Servo Enable signal input.
Differential P-ECL write data input.
CXA3172N
Symbol
Equivalent circuit
Description
2.1V
Head select signal input. Selects heads according Table
100k
Read Amplifier output.
2.5V
setting resistor write current value connected between this GND.
100k
Read/Write signal input "High" Read, "Low" Write.
2.1V
Power save signal input "High" Power saving.
100k 2.1V
Electrical Characteristics
(Unless otherwise specified, VCC=5 Ta=25 Write current IW=15 Refer Fig.1 Test point Test point Test point -100 conditions Measurement conditions Min. Typ. Max. Unit Input voltage Output current Test point Test point
CXA3172N
Item
Symbol
ICCR
ICCW
ICCI
Digital input Pins
"High" applied voltage "Low" applied voltage Test point
VWDL
VWDH
VWDH -2.0 -1.1
VWDH -0.25 -0.4
Vunsel
VWUS
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 "Low" input voltage Write data input "High" input voltage Write data input current Unselected head voltage Write unsafe output saturation voltage Write unsafe output leak current
IWUS
When lowered from Min. Typ. Max. Unit
Item
Symbol Measurement conditions
conditions
starts flow, voltage VTHON. IW=AW VWC/RWC IW=KW/RWC Servo write enabled Servo write enabled 2.25 +1.5
Supply power ON/OFF detector threshold voltage Write mode does flow anymore, voltage VTHOFF. When raised from
Write current setting range
2.75
mAo-p mA/mA +1.6
Write current voltage
Write current gain
Write current setting constant
WUS/SE voltage
VSEH
WUS/SE sink current
ISEH
Read amplifier differential voltage gain
Frequency band width
Input voltage mVp-p, Load resistance (RDX, RDY) Test point [Vp-p] Frequency which lowers
CXA3172N
Min. Typ. Max. Unit
Item
Symbol Measurement conditions
conditions
Input referred noise
Head impedance when read amplifier output voltage amplified times voltage passed though (low pass filter cutoff frequency MHz) [Vrms], 0.47
Common mode rejection ration
CMRR
Power supply rejection ratio
PSRR
Test point In-phase input voltage mVp-p, When Read amplifier output [mVp-p], CMRR Test point Ripple voltage mVp-p, When Read amplifier output [mVp-p], PSRR Test point
CXA3172N
Measurement conditions Min. Typ. Max. Unit
Item
Symbol
conditions
Channel separation
VOFFR
Selected head input voltage mVp-p Unselected head input voltage mVp-p, When Read amplifier output [mVp-p], Test point VOFFR V2-V3 Test point -250
Read data output offset voltage Read RDX, common mode output voltage difference between modes Test point
Vdiff
-300
RDX, common mode output voltage Read
Test point
-2.6
-2.3 -2.0
CXA3172N
CXA3172N
Unless otherwise specified, VCC=5 Ta=25 (Write data frequency) MHz, IW=15 (Head inductance) (Head resistance value) Refer Fig. Fig. Item Head differential voltage amplitude Symbol Measurement conditions Differential voltage between switching Write current time required Write current turn 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 LH=540 RH=25 IW=10 time required Write current reach from same time required reach from Min. Typ. Max. Unit
Vp-p
Mode switching time 15-1 Read Write
TWR1 15-2 Mode switching time Write Read TWR2 Mode switching time Power saving Read Mode switching time safe unsafe Mode switching time unsafe safe
17-1
TSA1
17-2
TSA2
Head switching time Write current propagation delay time
Write current 20-1 rise/fall time
TR/TF
20-2
Write current rise/fall time
TR/TF
Read amplifier output mVp-p
CXA3172N
Test Circuit
5.1k 6.5V
to15MHz
3.3k
0.1µ 0.1µ 0.1µ
Fig.
Test Circuit
3.3k
5.1k
-10-
Fig.
CXA3172N
Timing Chart
TWR1
Fig. Timing Chart
TSA1
TSA2
Fig.
-11-
CXA3172N
Description Functions Read amplifier This noise amplifier amplifying signals from heads with emitter follower output. outputs differential amplifier whose polarity between side head input same. 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 XCS, WUS/SE. WUS/SE Table Table Table Mode selection Head selection heads selected shown Table pins. Head Table Head selection Servo write mode This mode allows writing multiple channels once. enable servo write mode follow these steps: Place device Read mode. following Table WUS/SE VSEH, input ISEH WUS/SE. While maintaing step above make low, placing device servo write mode.
Mode Write Read Servo Write Power saving
-12-
CXA3172N
Write unsafe detection circuit This circuit detects write errors. normal Write mode, output low; conditions listed below, high. Head inputs 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. Head Table Head selection Servo Write mode
-13-
CXA3172N
Application Circuit
PULSE DETECTOR 3.3k
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.
-14-
CXA3172N
Notes operation This device handles high frequency high gain signals. Please note following; Connect decoupling capacitor approximately 1000 near device. Make area large possible. When using 2-channel, short-circuit sides unused head pins leave them open. 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.
-15-
CXA3172N
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 Conditions Between head input pins Between head input pins RDY, LH=1 RH=30 IW=15 LH=0 RH=0 IW=15
VCC=5 Ta=25 Min. Typ. Max. 1500 3000 Unit
mAp-p -0.5
IWX+IWY
Setting Write current Write current with resistor IW=K/RWC (mA) Refer Fig.
Fig.5 Write current
Fig.6 Write current setting constant Write current
Write current setting constant
-Write current (mA)
52.5 K=RWC
47.5
Write Current (mA)
-16-
CXA3172N
Normalized write current Supply voltage 1.04 Ta=25°C RWC=3.3k 1.04
Normalized write current Ambient temperature VCC=5V RWC=3.3k
IW/IW (Ta=25°C)
IW/IW (VCC=5V)
1.02
1.02
0.98
0.98
0.96 Supply voltage
0.96
Ambient temperature [°C]
Normalized read amplifier voltage tgain 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 (VCC=5V)
1.02
1.02
0.98
0.98
0.96 Supply voltage
0.96
Ambient temperature [°C]
Power supply ON/OFF detector threshold voltage Ambient temperature
Power supply ON/OFF Detector Threshold Voltage
Ambient temperature [°C]
-17-
CXA3172N
Package Outline
Unit
20PIN SSOP(PLASTIC)
2.0MAX
0.15
0.83MAX 0.65
0.13
0.15 0.05
0.05MIN
10°MAX
DETAIL
PACKAGE STRUCTURE
PACKAGE MATERIAL SONY CODE EIAJ CODE JEDEC CODE SSOP-20P-L122 SSOP020-P-0300 LEAD TREATMENT LEAD MATERIAL PACKAGE MASS EPOXY RESIN PALLADIUM PLATING COPPER ALLOY 0.15g
NOTE PALLADIUM PLATING This product uses PdPPF (Palladium Pre-Plated Lead Frame).
-18-
0.75

4ch. Read/Write Amplifier Thin Film Head Hard Disk Drive Descript

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