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LD4000

PR4/EPR4 Read/Write Controller

GENERAL DESCRIPTION

The part is a high performance BICMOS read channel IC that provides all of the functions needed to

implement an entire Partial Response Class 4 (PR4) read channel for zoned recording hard disk drive

systems with data rates from 67 to 212 Mbps.

Functional blocks include a serial port, an automatic gain control amplifier, a programmable filter, an

offset canceller, a peak detecting pulse qualifier, an adaptive transversal filter, a Viterbi qualifier, a 8/9

GCR ENDEC, a data synchronizer, a time base generator, an integrating servo demodulator, as shown in

figure 1.

The part requires a single +5V power supply. The part utilizes an advanced BiCMOS process technology

along with advanced circuit design techniques which results in a high performance device with low power

consumption.

FEATURES

GENERAL

鈥?/div>

Register programmable data rates from 67 to

212 Mbit/s

Sampled data read channel with Viterbi

qualification

Programmable filter for PR4 equalization

Five tap transversal filter with adaptive PR4

equalization

8/9 GCR ENDEC

Data Scrambler / Descrambler

Presettable Precoder state

Programmable write precompensation

Low operating power - 1000mW maximum

at 5.5V to allow use of TOFP packages.

Active power management is applied to

achieve this target

Register programmable power management

(<5 mW power down mode)

4-bit nibble and byte wide bi-directional

NRZ data interface

8 bit direct write mode automatically

configured for CLK=VCO/8

Serial Interface port for access to internal

program storage registers

Single power supply (5V

鹵

10%)

Small package footprint: 100 lead TOFP

AUTOMATIC GAIN CONTROL

鈥?/div>

Dual mode AGC, continuous time during

acquisition, sampled during data reads

Separate AGC level storage pins for data and

servo

Dual rate attack and decay charge pump for

rapid AGC recovery in continuous time mode

Programmable, symmetric, charge pump

currents for data reads in sampled mode

Charge pump currents track programmable

data rate during data reads

Low drift AGC hold circuitry

Low-Z circuitry at AGC input provides for

rapid external coupling capacitor recovery

AGC Amplifier squelch during Low-Z

Wide bandwidth amplitude feedback circuit

to allow improved stability of AGC level vs.

frequency

Programmable AGC controls

鈥?/div>

Separate external input pins for AGC

hold, fast recovery, and Low-Z control

or

鈥?/div>

Internal Low-Z and fast recovery timing

for rapid transient recovery and AGC

acquisition. Timing set with external

resistors (2). Ultra fast decay current set

with external resistor.

鈥?/div>

version 2.1

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LD4000

英文版

PR4/EPR4 Read/Write Controller

ETC

LD4000
LD4000

英文版

PR4/EPR4 Read/Write Controller

ETC [ETC]

LD4000

LD4000 Datasheet

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LD4000 Datasheet

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