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DP84605R

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DP84605R 数据手册

PRELIMINARY

April 1994

DP84600R/DP84605R

Thin-Film/MIG Head Read/Write Preamplifier

General Description

Features

Low input capacitance: 12 pF typical

The DP84600R/DP84605R are 5V, high performance, four

channel, low power, read preamplifiers/write current drivers

designed for two-terminal recording head applications. An

idle mode is available which conserves power to a level of

0.5 mW (typically) when activated. Power supply fault pro-

tection is included to disable the write current generator

whenever the supply voltage is below 4V. Both parts incor-

porate 300X write damping.

Low input noise: 0.49 nV/ Hz typical

Low power: 100 mW typical in read mode

Very low idle power: 0.5 mW typical

Programmable write current source (1 mA–40 mA)

Low power supply protection in write mode

Head short to ground protection

Plug compatible to VTC VM7204/7104/7114

Single 5V power supply

The DP84600R has a read gain of 300 versus 200 for the

DP84605R.

Upon request, other options such as other read gains, PECL

inputs, no damping, and different packaging are available.

Block Diagram

TL/F/11990–1

FIGURE 1. Circuit Block Diagram

This Preliminary document contains information on a product under development. Specifications contained within are based

on design targets or a limited amount of data and are subject to change without notice. National Semiconductor reserves the

right to change or discontinue this product without notice.

1995 National Semiconductor Corporation

TL/F/11990

RRD-B30M105/Printed in U. S. A.

12 3 4 5 6 7...10

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