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Sony Semiconductor Electronic Components Datasheet

CXA3031Q Datasheet

Read/Write Amplifier (with Built-in Filters) for FDDs

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CXA3031Q
Read/Write Amplifier (with Built-in Filters) for FDDs
For the availability of this product, please contact the sales office.
Description
The CXA3031Q 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 2kand 15kin 1ksteps.
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–
E95318-ST


Sony Semiconductor Electronic Components Datasheet

CXA3031Q Datasheet

Read/Write Amplifier (with Built-in Filters) for FDDs

No Preview Available !

Block Diagram and Pin Configuration
CXA3031Q
24
WCLD 25
23 22 21 20 19 18
17
16 NC
WCMD 26
WCHD 27
PREAMP
FILTER
DIFF + LPF
(BPF)
15
FILTER
OUTA
14
FILTER
OUTB
IESET 28
D.GND 29
ERA0 30
ERA1 31
WRITE
DRIVER
ERASE
DRIVER
POWER
MONITOR
XPS 32
123
CONTROL
LOGIC
45
COMP
13 A.GND
12 MMVA
TIME
DOMAIN
FILTER
67
11 FCSET
10 VCC
9 XHD
8
–2–


Part Number CXA3031Q
Description Read/Write Amplifier (with Built-in Filters) for FDDs
Maker Sony Corporation
Total Page 26 Pages
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