– 1 –

CXA3071N

E96146B8Z

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

Description

The CXA3071N 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.

Features

• Single 5V power supply

• All filter, write current and other characteristics can

be set with a single external resistor.

• 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 and a custom

selection can be made between Chebyshev (1dB

ripple) and Butterworth for 1.6M, 2M/inner track

only.

can be customized.

• Preamplifier voltage gain can be set to 45dB or

48dB by switching the filter mode and inner/outer

track.

• Preamplifier and filter output are monitored with

the same pins. These pins are normally set to filter

output,

but

the

preamplifier

output

can

be

monitored by temporarily setting the SETR pin (Pin

20) to Low.

• Time domain filter can be switched between two

modes: 1M, 1.6M/2M.

In addition, the pulse width can be customized.

• Write current can be switched among six modes

according to the mode and inner/outer track

setting.

The current value can be customized for each

mode.

• Erase current remains constant, and the current

value can be customized.

• Damping resistor can be built in. Resistor can be

customized between 2k

Ω and 15kΩ in 1kΩ steps.

• Supply voltage detection circuit

Applications

Three-mode FDDs

Structure

Bipolar silicon monolithic IC

Absolute Maximum Ratings (Ta = 25°C)

• Supply voltage

7.0

V

• Digital signal input pin voltage

V

• Power ON output applied voltage

V

• Erase output applied voltage

V

• Write head applied voltage

15

V

• Power ON output current

7

mA

• Operating temperature Topr

–20 to +75

°C

• Storage temperature

Tstg

–65 to +150

°C

• Allowable power dissipation

375

mW

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.

20 pin SSOP (Plastic)

For the availability of this product, please contact the sales office.