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PDF CXA1720Q Data sheet ( Hoja de datos )
| Número de pieza | CXA1720Q | |
| Descripción | Read/Write Amplifier (with Built-in Filters) for FDDs | |
| Fabricantes | Sony Corporation | |
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CXA1720Q
Read/Write Amplifier (with Built-in Filters) for FDDs
For the availability of this product, please contact the sales office.
Description
The CXA1720Q is an IC for use with floppy disk
32 pin QFP (Plastic)
drives, and contains a Read circuit (with built-in
filters), Write circuit, Erase circuit, and supply
voltage detection circuit, all into a single chip.
Features
• Single 5 V power supply.
• Filter system can be switched among four modes:
1M/2M, and inner track/outer track. This allows for
a significant reduction in the number of external
parts such as differentiator constants, low-pass
filters, and switches. (Compared with conventional
Sony products, the number of parts has been
reduced by one-half.)
• Filter characteristics can be customized.
• Low pre-amplifier input conversion noise voltage of
2.0 nV/ √ Hz (typ.) keeps Read data output jitter to
a minimum. The pre-amplifier voltage gain can be
selected as either 100× or 200×.
• The monostable multivibrator No. 1 pulse width
switching function for the time domain filter permits
switching between 1M and 2M mode.
• Write current switching function permits switching
of the Write current among four modes: 1M/2M
and inner track/outer track. (Filter inner track/outer
track switching is separate.)
Block Diagram and Pin Configuration
• Supply voltage detection circuit prohibits error
writing during power ON/OFF or abnormal voltage.
• Power consumption is kept down to 115 mW (typ.)
and this IC is suitable for use with battery-driven
FDDs.
• Built in Time constant capacitors for monostable
multivibrator Nos. 1 and 2. (The pulse width for
monostable multivibrator No. 2 is fixed.)
• Power saving function reduces power consumption
when the IC is not in use. When in power saving
mode (5 mW typ.), only the power supply ON/OFF
detector functions.
• The Write driver has a built-in reset circuit. When
the mode is switched from Read mode to Write
mode, the Write current flows from head 0A if head
side 0 is selected and from head 1A if head side 1
is selected.
W/C 1
SET
25
W/C 1
COMP 26
W/C 2
SET 27
W/C 2
COMP
28
D.GND 29
ERASE
OUT 0
30
ERASE
OUT 1
31
POWER 32
SAVE
24 23 22 21 20 19 18 17
PREAMP
WRITE
DRIVER
FILTER
DIFF+LPF
(BPF)
16
FILTER
OUT B
15
COMP
IN B
14
COMP
IN A
13 A.GND
ERASE
DRIVER
POWER
MONITOR
CONTROL
LOGIC
12 MMVA
11
FILTER
SET
10 Vcc
9 HIGH
DENSITY
12345678
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—
E93717-TE
1 page  
Pin
Symbol
Pin voltage
No.
18 VREF
2.8 V
CXA1720Q
Equivalent circuit
Vcc
500
18
Description
Connection for internal reference voltage
decoupling capacitor. Connect the decoupling
capacitor CREF between this pin and A.GND.
19 PREAMP
OUT
2.8 V
21 HEAD 1B
22 HEAD 1A
23 HEAD 0B
24 HEAD 0A
—
—
—
—
120µ
140
A.GND
Vcc
Pre-amplifier output.
19
320µ
24 23 22 21
A.GND
Connection for magnetic head input/output.
Connect the recording/playback magnetic head to
these pins, and connect the center tap to VCC.
When the logical voltage for Pin 7 (SIDE1) is low,
the HEAD1 system is active; when the logical
voltage is high, the HEAD0 system is active.
25 W/C1SET
27 W/C2SET
1.2V
26 W/C1
COMP
—
28 W/C2
COMP
—
A.GND
Connection for 1M write current setting resistor.
Vcc Connect the Write current setting resistor RW1
between this pin and VCC to set the Write current.
147 25
27
147
Connection for 2M Write current setting resistor.
Connect the Write current setting resistor RW2
between this pin and VCC to set the Write current.
A.GND
Vcc
26
28
A.GND
Connection for 1M Write current compensation
resistor.
Connect the Write current compensation resistor
RWC1 between this pin and Pin 25 (W/C1SET) to
set the amount of increase in the Write current.
Connection for 2M Write current compensation
resistor.
Connect the Write current compensation resistor
RWC2 between this pin and Pin 27 (W/C2SET) to
set the amount of increase in the Write current.
—5—
5 Page 
CXA1720Q
(dB)
GPN
G1N
G2N
(N=1 to 4)
1
3
f0
f0
3f0
f(Hz)
Fig. 2 Filter frequency response measurement conditions
—11—
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet CXA1720Q.PDF ] | |
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