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1993_Motorola_Linear_Interface_ICs_Vol_2.pdf

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MOTOROLA<br />

- SEMICONDUCTOR -----­<br />

TECHNICAL DATA<br />

FLOPPY DISK READ AMPLIFIER<br />

The MC3470 is a monolithic READ Amplifier System for obtaining<br />

digital information from floppy disk storage. It is designed to<br />

accept the differential ac signal produced by the magnetic head<br />

and produce a digital output pulse that corresponds to each peak<br />

of the input signal. The gain stage amplifies the input waveform<br />

and applies it to an external filter network, enabling the active<br />

differentiator and time domain filter to produce the desired<br />

output.<br />

• Combines All the Active Circuitry To Perform the Floppy Disk<br />

Read Amplifier Function in One Circuit<br />

• Guaranteed Maximum Peak Shift of 2.0% - MC3470A<br />

• Improved (Positive) Gain Te and Tolerance<br />

• Improved Input Common Mode<br />

• See Application Note AN917 for Further Information<br />

Analog Inputs<br />

TYPICAL APPLICATION<br />

Filter Network<br />

Geln Select<br />

Active<br />

Oifferentiator<br />

Mono #1 Mono #2<br />

Amplifier<br />

Inputs<br />

MC3470<br />

MC3470A<br />

FLOPPY DISK<br />

READ AMPLIFIER SYSTEM<br />

Offset<br />

Decoupling<br />

Gnd<br />

One-Shot<br />

Components<br />

Mono #1<br />

8<br />

One-Shot<br />

{<br />

Components<br />

Mono #2 9<br />

MOTOROLA LINEAR/INTERFACE <strong>ICs</strong> DEVICE DATA<br />

7-109<br />

SILICON MONOLITHIC<br />

INTEGRATED CIRCUIT<br />

-1<br />

P SUFFIX<br />

PLASTIC PACKAGE<br />

CASE 707<br />

PIN CONNECTION<br />

Data<br />

Output

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