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參數(shù)資料
| 型號： | LD4000 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | PR4/EPR4 Read/Write Controller |
| 中文描述： | PR4/EPR4讀/寫控制器 |
| 文件頁數(shù)： | 2/4頁 |
| 文件大?。?/td> | 549K |
| 代理商： | LD4000 |
LD4000
PR4/EPR4 Read/Write Controller
Page 2
version 2.1
FILTER / EQUALIZER
Programmable, 7-pole, continuous time filter
with asymmetrical zeros
Channel filter and pulse slimming
equalization for coarse equalization to PR4
Programmable cutoff frequency from 10 to
56 MHz
Programmable boost/equalization of 0 to 13
dB
Programmable “zeros” equalization provides
asymmetry compensation
±
30% group delay variation from 0.3Fc to
Fc with Fc=56 MHz
Low-Z switch for fast offset recovery at the
filter output
No external coupling capacitors required
DC offset compensation provided at the filter
output
Three or Five tap transversal filter for fine
equalization to PR4.
Self adapting symmetric Inner taps
Programmable symmetric outer taps with 4
bits of resolution
Equalization hold input
Asymmetry factor output and “zeros”
channel quality output
PULSE QUALIFICATION
Sampled Viterbi qualification of signal
equalized to PR4
Register programmable hysteresis or window
qualification peak detector for servo reads,
with programmable thresholds
Selectable RDS pulse width for servo grey
code reads
RDS and PPOL outputs are disabled during
burst capture to reduce noise generation
TIME BASE GENERATOR
Better than 1% frequency resolution
Up to 225 MHz frequency output
Independent M and N divide-by registers
No active external components required
DATA SEPARATOR
Fully integrated data separator includes data
synchronizer and
8/9
GCR ENDEC
Register programmable to 212 Mbps
Fast Acquisition, sampled data phase locked
loop
Decision directed clock recovery from data
samples
Adaptive clock recovery thresholds
Programmable damping ratio for data
synchronizer PLL is constant for all data
rates
Data scrambler / descrambler to reduce fixed
pattern effects
Byte wide NRZ data interface and 4 bits
nibble interface
Time base tracking, programmable write
precompensation
Differential PECL write data output
Surface defect scan mode
Direct Write modes
SERVO
6-burst servo capture with A-B, C-D, E-F
outputs
Internal hold capacitors
Separate, automatically selected, registers for
servo fc, boost, and threshold
Wide bandwidth, high precision full-wave
rectifier is optimized for low-level linearity
“Soft Landing” charge pump architecture
Programmable selection of normal or
differentiated filter output to servo-capture
block
Programmable gain with 2 external inputs
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