74HCT9046AN Philips, 74HCT9046AN Datasheet - Page 11
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74HCT9046AN
Manufacturer Part Number
74HCT9046AN
Description
PLL with bandgap controlled VCO
Manufacturer
Philips
Datasheet
1.74HCT9046AN.pdf
(40 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
74HCT9046AN
Manufacturer:
PHILIPS
Quantity:
2 967
Philips Semiconductors
1999 Jan 11
PLL with bandgap controlled VCO
The pulse overlap of the up and down signals (typically 15 ns).
a. Response with traditional voltage-switch charge-pump PC2
(1) Due to parasitic capacitance on PC2
(2) Backlash time (dead zone).
b. Response with current switch charge-pump PC2
VCO IN
Fig.11 The response of a locked-loop in the vicinity of the zero crossing of the phase error.
2.75
2.50
2.25
SIG IN
UP
DOWN
CURRENT AT
PC2 OUT
PC2
PCP OUT
COMP IN
VCO OUT
25
OUT
/VCO
(1)
IN
OUT
(2)
a.
0
OPC IN
.
phase error (ns)
OUT
(1)
Fig.10 Timing diagram for PC2.
as applied in the HCT9046A.
OUT
25
high impedance OFF state,
(zero current)
(4046A).
11
VCO IN
2.75
2.50
2.25
25
0
b.
phase error (ns)
MBD047 - 1
74HCT9046A
Product specification
MBD043
25