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PDF CXA1940N Data sheet ( Hoja de datos )
| Número de pieza | CXA1940N | |
| Descripción | 4ch. Read/Write Amplifier for Thin Film Head of Hard Disk Drive | |
| Fabricantes | Sony Corporation | |
| Logotipo |  |
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CXA1940N
4ch. Read/Write Amplifier for Thin Film Head of Hard Disk Drive
For the availability of this product, please contact the sales office.
Description
The CXA1940N is a Read/Write Amplifier for the
thin film head of hard disk drives and designed to
handle up to 4-channel heads.
20 pin SSOP (Plastic)
Features
• Operate on single +5V power supply.
• Low power consumption.
Read : 95mW
Write (IW=20mA) : 130mW+IW × 5
Power save : 5.5mW
• Write current can be varied through an external
resistor. Built-in stabilizing circuit provides stable
current during voltage and temperature drift.
• Drives up to 4 heads.
• Designed for two-terminal thin-film or MIG heads.
• Built-in power save function.
• Read amplifier emitter follower output featuring
290 times gain (Typ.).
• Built-in Write unsafe detection circuit.
• Built-in supply voltage monitor circuit prohibits
incorrect Write during power on or abnormal
voltage.
• Built-in IC protection circuit for short of head and
GND.
• Differential input capacitance for Read : 14pF
(Typ.).
• Write data input minimum pulse width : 10ns
• Read data output become high impedance in write
mode to improve read data offset when switching
from write to read mode.
• Unselected head DC voltage is GND potential.
• Self switching damping resistance (RD=310Ω)
Block Diagram and Pin Configuration
GND 1
H0X 2
H0Y 3
H1X 4
H1Y 5
H2X 6
H2Y 7
H3X 8
H3Y 9
NC 10
DRIVER
AMP
DRIVER
AMP
DRIVER
AMP
DRIVER
AMP
IC
PROTECTOR
MODE
CONTROL
WRITE
CURRENT
SOURCE
AMP
HEAD
SELECT
POWER
ON/OFF
DETECTOR
T-FF
WRITE
UNSAFE
DETECTOR
20 PS
19 R/W
18 WC
17 RDY
16 RDX
15 HS0
14 HS1
13 VCC
12 WDI
11 WUS
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—
E93X03-TE
1 page  
CXA1940N
Electrical Characteristics
(Unless otherwise specified, VCC=5V, Ta=25°C, Write current IW=20mA)
No. Item
Current consump-
1-1 tion for Read
Sym-
SW Conditions
bol
12
345
678
Measurement conditions
9 101112
Min.
Test point : I4
IR b a a a a b a a a a b a
12
Current consump-
Test point : I4
1-2 tion for Write
IW b a a a a b a a a a a a
17
+IW
Current consump-
Test point : I4
1-3 tion for Power save IP b a a a a b a a a a b b
0.6
Digital input “Low”
2-1 input voltage
VIL
Digital input :
Pins 12, 14, 15, 19, 20
Digital input “High”
2-2 input voltage
VIH
2.0
Digital input “Low”
2-3 input current
IIL
“High” applied voltage : 5V
aa aaa aaa aa aa
–20
“Low” applied voltage : 0V
Digital input “High”
Test point : I3, I5, I6, I7, I8
2-4 input current
IIH a a a a a b a b b a b b
Write unsafe output
Output current : 1mA
3-1 saturation voltage VWUS b a a a b c a a a a a a Test point : V1
Write unsafe output
Test point : I2
3-2 leak current
IWUS b a a a e c a a a a a a
When VCC is lowered
from 5V in Write mode
Supply power
4 ON/OFF detector
threshold voltage
and IW does not flow
anymore, VCC voltage is
VTH b a a a a b a a a a a a set to VTHOFF. When
VCC is raised from 3V
3.6
and IW starts to flow, VCC
voltage is set to VTHON.
Write current setting
5 range
IW b a a a a b a a a a a a
5
Typ. Max. Unit
19 26 mA
26
+IW
35
+IW
mA
1.1 1.5 mA
0.8 V
V
µA
70 µA
0.5 V
20 µA
3.9 4.3 V
20 mAo-p
Write current
6 tolerance
∆Iw b a a a a b a a a a a a
-8 8 %
Read amplifier
7 differential voltage
gain
Input voltage SG1 :
1mVp-p, 300kHz
Load resistance (RDX,
AV b a a a c b a a a b b a RDY) : 1kΩ
Test point : V4 [Vp-p]
AV= V4
SG1
245 290 335 V/V
Frequency
8 band width (–3dB)
BW b a a a c b a a a b b a Frequency at which AV
lowers by 3dB
30
MHz
—5—
5 Page 
CXA1940N
Write unsafe detection circuit
Abnormal Write mode is detected.
In normal Write mode, WUS output turns to “Low” and in the following other conditions, WUS output turns to
“High”.
• Head input is open.
• Head input is shorted to GND.
• Write data frequency is abnormally low.
• No write current
• In read
• In power save
Power supply ON/OFF detection
VCC is monitored to avoid incorrecting Write.
Recording and Playback functions are inhibited as detected as abnormal when VCC decreases below the
power supply ON/OFF detector threshold voltage (VTH). When VCC is higher than VTH, the above inhibition is
released.
—11—
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet CXA1940N.PDF ] | |
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