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P32P4911A

PRML Read Channel with PR4, 8/9 ENDEC, FWR Servo

Philips Electronics 

Philips Semiconductors

PRML Read Channel with PR4,

8/9 ENDEC, FWR Servo

Product specification

P32P4911A

GENERAL DESCRIPTION

The Philips Semiconductors P32P4911A 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 42 to 125 Mbit/s or 33 to 100 Mbit/s. Functional blocks include AGC, programmable

filter, adaptive transversal filter, Viterbi qualifier, 8,9 GCR ENDEC, data synchronizer, time base generator, and FWR

servo.

Programmable functions such as data rate, filter cutoff, filter boost, etc., are controlled by writing to the serial port

registers so no external component changes are required to change zones.

The part requires a single +5V power supply. The Philips Semiconductors P32P4911A utilizes an advanced BiCMOS

process technology along with advanced circuit design techniques which result in high performance devices with low

power consumption.

FEATURES

General:

• Register programmable data rates from 42 to 125 Mbit/s or 33 to 100 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 (0.925 W typical at 5V)

• Register programmable power management (<5 mW power down mode)

• 4-bit nibble and byte-wide bi-directional NRZ data interfaces

• 8-bit Direct Write mode automatically configured for RCLK = VCO/8

• Serial interface port for access to internal program storage registers

• Single power supply (5V ± 10%)

• Small footprint, 100-lead LQFP package

1996 Jul 25

2

853-1850 17093

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