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PDF 74HCT9046A Data sheet ( Hoja de datos )
| Número de pieza | 74HCT9046A | |
| Descripción | PLL with bandgap controlled VCO | |
| Fabricantes | Philips | |
| Logotipo |  |
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INTEGRATED CIRCUITS
DATA SHEET
74HCT9046A
PLL with bandgap controlled VCO
Product specification
Supersedes data of March 1994
File under Integrated Circuits, IC06
1999 Jan 11
1 page  
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12 R2
R2
Vref2
11 R1
R1
10 DEMOUT
Rs
C1 f OUT
6
C1A
74
C1B VCOOUT
f IN
3
COMP IN
14
SIG IN
PC1
VCO
Vref1
Vref1 Vref2
logic
1
up
DQ
CP
Q
RD
logic
1
DQ
CP
down
R
Q
D
BAND
GAP
9
VCO IN
5
INH
PCP
CHARGE
PUMP
V ref2
PC1 OUT /
PCPOUT 2
R3
PC2OUT 13
R4
C2
R b 15
Rb
MBD102 - 1
Fig.5 Logic diagram.
5 Page 
Philips Semiconductors
PLL with bandgap controlled VCO
Product specification
74HCT9046A
SIG IN
COMP IN
VCO OUT
UP
DOWN
OPC IN
CURRENT AT
PC2 OUT
PC2 OUT /VCO IN
high impedance OFF state,
(zero current)
PCPOUT
The pulse overlap of the up and down signals (typically 15 ns).
Fig.10 Timing diagram for PC2.
MBD047 - 1
2.75
VCO IN
2.50
(1)
(1)
(2)
2.75
VCO IN
2.50
2.25
25
0 25
phase error (ns)
a.
2.25
25
0 25
phase error (ns)
MBD043
b.
a. Response with traditional voltage-switch charge-pump PC2OUT (4046A).
(1) Due to parasitic capacitance on PC2OUT.
(2) Backlash time (dead zone).
b. Response with current switch charge-pump PC2OUT as applied in the HCT9046A.
Fig.11 The response of a locked-loop in the vicinity of the zero crossing of the phase error.
1999 Jan 11
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet 74HCT9046A.PDF ] | |
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