參數(shù)資料
型號: P32P4911A
廠商: NXP SEMICONDUCTORS
元件分類: 光電元器件
英文描述: PRML Read Channel with PR4, 8/9 ENDEC, FWR Servo
中文描述: 1 CHANNEL READ CHANNEL, PQFP100
封裝: 14 X 14 X 1.40 MM, PLASTIC, LQFP-100
文件頁數(shù): 8/63頁
文件大?。?/td> 257K
代理商: P32P4911A
1996 Jul 25
8
Philips Semiconductors
Product specification
PRML Read Channel with PR4,
8/9 ENDEC, FWR Servo
P32P4911A
same in both of the P32P4911A's AGC control modes. In internally timed mode, the LOWZ, FASTREC, and HOLD input
pins are logically OR'ed with their respective internal control signals but do not affect the internal sequencing of the
one-shot generated AGC control signals.
Figure 1: AGC Timing (Internal) Diagrams - Power-On Mode
PDWN
AGC
INPUT
AGC LOWZ
FAST FILTER
OFFSET RECOVERY
AGC HOLD
AGC SQUELCH
AGC FAST RECOVERY
(ATTACK & DECAY)
AGC ULTRA
FAST RECOVERY
(DECAY)
t
LZ
Power-on gain recovery
AGC
OUTPUT
100%
125%
NORMAL
ATTACK
+
-
ULTRA
FAST
DECAY
t
LZ
t
LZ
t
FR
t
LZ
POWERED UP
FAST
ATTACK
Ultra fast decay current is disabled when signal is greater
than 125% of nominal.
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