L6000 datasheet(7/24 Pages) STMICROELECTRONICS

7 / 24 page

SYSTEM DESCRIPTION

Pulse Detector Section

Fast attack/decay modes for rapid AGC recovery.

Dual rate charge pump for fast transient recovery.

Low Drift AGC hold circuitry supports programma-

ble gain, non-AGC operation. Temperature com-

pensated, exponential control AGC. Shorted input

switch for transient recovery, during Power down

& Write to read & Idle mode transitions. Wide

Bandwidth, high precision full-wave rectifier. Dual

mode pulse qualification circuitry allows either in-

dependent positive and negative threshold qualifi-

cation to suppress error propagation or hysteresis

comparison wich implements alternating polari-

ties. Differential qualifier comparator. TTL READ

DATA I/O signal

output available during servo

and idle modes. Timing for shorted inputs and

fast decay functions set internally. 0.5 ns max.

pulse pairing with sine wave input.

Embedded Servo Demodulator Section

Dual servo burst (A/B) capture with Position Error

Signal Output. Servo AGC mode which holds sum

of A and B bursts constant. Provision for on-chip

switching of the hysteresis threshold time con-

stant.

Programmable Filter Section

Programmable filter cutoff frequency (fc = 6 to 18

MHz). Programmable pulse slimming equalization

(0 to 9 dB Boost at the filter cutoff frequency).

Matched path timing normal and differential low-

pass outputs. Differential filter input and outputs

for noise rejection

±10% cutoff frequency accu-

racy.

±2% maximum group delay variation in the

passband maintained over the cutoff frequency

tuning range ( fc=6 to 18 MHz ). Total harmonic

distortion less than 1.5 %. No external filter com-

ponents required. Shorted input switch for tran-

sient recovery, during Power down & Write to

Read & Idle mode transitions.

Frequency Synthesizer and Data Separator

Section

1% frequency resolution. Data synchronizer and

1.7 RLL ENDEC. Fast acquisition phase lock loop

with zero phase restart both to data and synthe-

sizer. Fully integrated data separator. No external

delay lines or active devices required. No external

active PLL components required. Active window

centering symmetry control via serial port. Win-

dow shift control

±30%. Includes delayed read

data and VCO clock monitor tests points. Pro-

grammable write precompensation. Hard and soft

sector operation.

THERMAL DATA

Symbol

Parameter

Value

Unit

Rth j-amb

Thermal Resistance Junction-Ambient

100

°C/W

Rth j-case

Thermal Resistance Junction-Case

°C/W

RECOMMENDED OPERATING CONDITIONS

Vccn

Supply Voltage

4.3 to 5.5

Tamb

Operating Ambient temperature

0 to 70

°C

Junction Temperature

25 to 125

°C

L6000

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