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PDF CXA3010 Data sheet ( Hoja de datos )
| Número de pieza | CXA3010 | |
| Descripción | Read/Write Amplifier (with Built-in Filters) for FDDs | |
| Fabricantes | Sony Corporation | |
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CXA3010Q
Read/Write Amplifier (with Built-in Filters) for FDDs
For the availability of this product, please contact the sales office.
Description
The CXA3010Q is a monolithic IC designed for use
with three-mode Floppy Disk Drives, and contains a
read circuit (with a four-mode filter system), a write
circuit, an erase circuit, and a supply voltage
detection circuit, all on a single chip.
32 pin QFP (Plastic)
Features
• Single 5V power supply
• Filter system can be switched among four modes:
1M, 1.6M/2M, which are each inner track/outer
track
• Filter characteristics can be set to Chebyshev
(1dB ripple) for 1.6M, 2M/inner track only, and to
Butterworth for the other modes
• A custom selection can be made between
Chebyshev (1dB ripple) and Butterworth for the
filter characteristics for 1.6M, 2M/inner track only
• Permits customization of the fc ratio
• Low preamplifier input conversion noise voltage of
2.0nV/√ Hz (typ.) keeps read data output jitter to a
minimum
• Preamplifier voltage gain can be switched between
39dB and 45dB
• In inner track mode (OTF = Low), the voltage gain
is boosted by 3dB, making it possible to minimize
peak shift in inner tracks.
• Time domain filter can be switched between two
modes: 1M, 1.6M/2M
• Write current can be switched among three
modes: 1M/1.6M/2M. The inner/outer track current
ratio is fixed for each mode, but can be
customized.
• Erase current can be set by an external resistor,
and remains constant. In addition, the current rise
time Tr and fall time Tf are determined according
to the head inductance and current. (Refer to
page 20.)
• Damping resistor can be built in. Resistance can
be customized between 2kΩ and 15kΩ in 1kΩ
steps. A damping resistor can not be connected to
this IC, however.
• Supply voltage detection circuit
Applications
Three-mode FDDs
Structure
Bipolar silicon monolithic IC
Absolute Maximum Ratings (Ta = 25°C)
• Supply voltage
VCC 7.0
V
• Operating temperature Topr –20 to +75 °C
• Storage temperature Tstg –65 to +150 °C
• Allowable power dissipation
PD 500 mW
• Digital signal input pin Input voltage
–0.5 to VCC + 0.3 V
• Power ON output voltage applied VCC + 0.3
V
• Erase output voltage applied
VCC + 0.3
V
• Write head voltage applied
15 V
• Write current
IW 20 mAo-p
• Erase current
IE 30 mA
• Power on output current
7 mA
Operating Conditions
Supply voltage
4.4 to 6.0 V
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–
E94Y32A52-ST
1 page  
CXA3010Q
Pin
No.
Symbol
Pin
voltage
Equivalent circuit
Description
21 HEAD 1B —
22 HEAD 1A —
23 HEAD 0B —
24 HEAD 0A —
24 23 22 21
Magnetic head input/output connections.
Connect the recording/playback magnetic
head to these pins, and connect the center
tap to VCC. When the logical voltage for
Pin 7 (XS1) is Low, the HEAD1 system is
active; when the logical voltage is High, the
HEAD0 system is active.
A.GND
25 WCLD
26 WCMD
27 WCHD
5V
when
XWG
= High
1.2V
3.8V
when
XWG
= Low
28 IESET
5V
when 1.2V
XEG
= High
3.8V
when
XEG
= Low
29 D.GND
—
30 ERA0
—
147
147
147
147
1M write current setting resistor connection.
Connect the write current setting resistor
VCC RWLD between this pin and VCC to set the
write current.
25
26 1.6M write current setting resistor connection.
27 Connect the write current setting resistor
RWMD between this pin and VCC to set the
write current.
A.GND
2M write current setting resistor connection.
Connect the write current setting resistor
RWHD between this pin and VCC to set the
write current.
VCC
28 Erase current setting resistor connection.
Connect the erase current setting resistor RE
between this pin and VCC to set the erase
current.
A.GND
Digital system GND connection.
VCC
30 Erase current connection for the HEAD0
system.
31
31 ERA1
—
A.GND
Erase current connection for the HEAD1
system.
–5–
5 Page 
CXA3010Q
Item
Symbol
Conditions
Measure- Measure-
ment circuit ment Point
Min.
Typ.
Max. Unit
X360 = Low
XHD = High
OTF = Low
(1.6M/inner track)
Peak frequency fo4 or
X360 = X
1.6M/
2M
inner
XHD = Low
OTF = Low
(2M/inner track)
track Peak voltage
gain∗3
Gp4 at f04 Refer to Fig. 2
1
1
B, C 310.5 345.0 379.5 kHz
D, E
B, C
5.9 7.8 9.4 dB
Frequency
response (1)
G41
Refer to Fig. 2
at 1/3f04
1
B, C –8.5 –8.0 –7.5 dB
Frequency
response (2)
G42
Refer to Fig. 2
at 3f04
∗3 Gpn = 20 log10 (VFilterout/Vpreout)
VFilterout = Filter differential output voltage
(n = 1 to 4)
1
B, C –36.9 –35.0 –33.4 dB
[dB]
Gpn
Gn1
Gn2
(n = 1 to 4)
1/3fon
fon 3fon
f [Hz]
Fig. 2. Filter frequency response measurement conditions
– 11 –
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet CXA3010.PDF ] | |
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