參數(shù)資料
型號(hào): HCT9046
廠商: NXP Semiconductors N.V.
英文描述: PLL with bandgap controlled VCO
中文描述: 鎖相環(huán)控制VCO的帶隙
文件頁數(shù): 11/40頁
文件大?。?/td> 240K
代理商: HCT9046
1999 Jan 11
11
Philips Semiconductors
Product specification
PLL with bandgap controlled VCO
74HCT9046A
MBD047 - 1
SIGIN
COMPIN
VCOOUT
high impedance OFF state,
(zero current)
UP
DOWN
CURRENT AT
PC2OUT
PC2OUT
IN
PCPOUT
OPCIN
Fig.10 Timing diagram for PC2.
The pulse overlap of the up and down signals (typically 15 ns).
Fig.11 The response of a locked-loop in the vicinity of the zero crossing of the phase error.
b. Response with current switch charge-pump PC2
OUT
as applied in the HCT9046A.
MBD043
25
2.50
2.75
2.25
VCOIN
0
25
phase error (ns)
(1)
(1)
(2)
25
2.50
2.75
2.25
VCOIN
0
25
phase error (ns)
a. Response with traditional voltage-switch charge-pump PC2
OUT
(4046A).
(1) Due to parasitic capacitance on PC2
OUT
.
(2) Backlash time (dead zone).
b.
a.
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