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PDF CXA1829N Data sheet ( Hoja de datos )
| Número de pieza | CXA1829N | |
| Descripción | 8ch. Read/Write Amplifier for Thin Film Heads of Hard Disk Drive | |
| Fabricantes | Sony Corporation | |
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CXA1829N
8ch. Read/Write Amplifier for Thin Film Heads of Hard Disk Drive
For the availability of this product, please contact the sales office.
Description
The CXA1829N is a Read/Write amplifier for hard
30 pin SSOP (Plastic)
disk drive thin-film heads and is designed to handle
up to 8-channel heads.
Features
• Operates on a single 5V power supply.
• Low power consumption.
Read: 115 mW
Write (IW = 15 mA): 160 mW + IW × 5
Power Save: 7 mW
• Write current can be varied through an external
resistor. Built-in stabilizer circuit provides stable
current, preventing voltage and temperature drift.
• Drives up to 8 heads.
• Supports thin film heads or 2-pin MIG heads.
• Emitter follower-type Read amplifier features 290
times gain (typ.).
• Write-unsafe detection circuit.
• Damping resistance is switched at Write (315 Ω).
• Simultaneous Write function.
• Supply voltage monitor circuit prohibits error
writing during power surge or abnormal voltage.
• IC protection circuit for head-to-ground short circuit
protection.
• Differential input capacitance at Read: 14 pF (typ.).
• Write data input minimum pulse width: 10 ns
• Read data output in Write mode becomes a high
impedance due to the improved Read data offset
when Write is switched to Read.
• Non-selected head DC voltage falls to GND level.
Absolute Maximum Ratings (Ta=25°C)
• Supply voltage
VCC 7.0
V
• Write current
IW 20 mAo-p
• Operating temperature Topr –20 to +75 °C
• Operating temperature at Simultaneous Write
Topr –20 to +30 °C
• Storage temperature Tstg –55 to +150 °C
• Allowable power dissipation
PD 480
mW
Recommended Operating Conditions
• Supply voltage
VCC 5V±10%
V
Structure
Bipolar silicon monolithic IC
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
—1—
E94433A49-TE
1 page  
CXA1829N
Electrical Characteristics (unless otherwise specified, VCC = 5 V, Ta = 25°C, Write current IW = 15 mA)
Refer to Measurement Circuit 1.
Measure-
Item
Symbol
Measurement conditions
ment Min. Typ. Max. Unit
point
Current consumption for
Read
IR R/W="H"
E 17 23 33
Current consumption for
Write
Current consumption for
Servo
IW R/W="L"
ISE WSER="L"
24 32 45
E
+IW +IW +IW
mA
71 91 111
E
+4×IW +4×IW +4×IW
Current consumption for
Power save
IP PS="H"
E 0.8 1.4 2.0
Digital low input voltage
Digital high input voltage
Digital low input current
Digital high input current
VIL
VIH
IL
High applied voltage: 5 V
Low applied voltage: 0 V
IH
B
D
F 2.0
G
H -70
I
J
0.8
V
µA
70
Write-unsafe output
VWUS Output current: 1 mA C 0.5 V
saturation voltage
Write-unsafe output leak
current
IWUS
C 10 µA
Power ON/OFF detector
threshold voltage
VTH
VCC
3.6 3.9 4.3 V
A
Write current setting
range
IW Current flowing between head pins.
A5
15 mAo-p
Write current accuracy
When Write current is IW [mA], then:
∆Iw IW= _RK_w_(Rw:Ω),
Refer to Fig. 12 (Characteristics) for K.
A
-8
8%
Read amplifier differential
voltage gain
Input voltage SG1:1mVp-p,300kHz
AV
Load resistance (RDX, RDY): 1kΩ
K 245 290 335 V/V
Bandwidth (-3 dB)
BW Frequency at which Av drops by 3dB
K 60
MHz
Input conversion noise
voltage
Common mode rejection
ratio
EN Head impedance: 0 Ω
In-phase input voltage SG2:100mVp-p,
CMRR
10 MHz
K
K
nV
0.55 0.7
√Hz
50 77
dB
—5—
5 Page 
CXA1829N
Write-unsafe detection circuit (refer to the “Notes on Operation.”)
This circuit detects write errors.
In normal Write mode, the WUS output is low; in the conditions listed below, it is high.
• Head input is open.
• Head input is shorted to GND or VCC.
• Write data frequency is abnormally low.
• There is no Write current.
• In Read mode
• In Power save mode
• Supply voltage is abnormal (refer to the “Power supply ON/OFF detection.”)
Power supply ON/OFF detection
This circuit monitors VCC to detect erroneous Writes.
The error status is established when VCC falls below the threshold voltage (VTH) of the power supply ON/OFF
detector, in which case the recording and playback functions are prohibited.
When VCC rises above VTH, the prohibition of these functions is released.
Application Circuit
PULSE
DETECTOR
+5V
1µ
RW 10k
3.9k
30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Fig. 5
Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for
any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same.
—11—
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet CXA1829N.PDF ] | |
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