LMK03033CISQE/NOPB National Semiconductor, LMK03033CISQE/NOPB Datasheet - Page 22
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LMK03033CISQE/NOPB
Manufacturer Part Number
LMK03033CISQE/NOPB
Description
IC CLOCK CONDITIONER PREC 48LLP
Manufacturer
National Semiconductor
Type
Clock Conditionerr
Datasheet
1.LMK03000DISQENOPB.pdf
(30 pages)
Specifications of LMK03033CISQE/NOPB
Pll
Yes
Input
Clock
Output
LVDS, LVPECL
Number Of Circuits
1
Ratio - Input:output
1:4
Differential - Input:output
Yes/Yes
Frequency - Max
2.1GHz
Divider/multiplier
Yes/No
Voltage - Supply
3.15 V ~ 3.45 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
48-LLP
Frequency-max
2.1GHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
LMK03033CISQETR
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LMK03033CISQE/NOPB
Manufacturer:
NS
Quantity:
464
Part Number:
LMK03033CISQE/NOPB
Manufacturer:
TI/德州仪器
Quantity:
20 000
www.national.com
3.4 LOOP FILTER
The internal charge pump is directly connected to the inte-
grated loop filter components. The first and second pole of the
loop filter are externally attached as shown in
the loop filter is designed, it must be stable over the entire
frequency band, meaning that the changes in K
low to high band specification will not make the loop filter un-
stable. The design of the loop filter is application specific and
can be rather involved, but is discussed in depth in the Clock
Conditioner Owner's Manual provided by National Semicon-
ductor. When designing with the integrated loop filter of the
LMK03000 family, considerations for minimum resistor ther-
mal noise often lead one to the decision to design for the
minimum value for integrated resistors, R3 and R4. Both the
Figure
Vtune
4. When
from the
FIGURE 4. Loop Filter
22
integrated loop filter resistors and capacitors (C3 and C4) also
restrict how wide the loop bandwidth the PLL can have. How-
ever, these integrated components do have the advantage
that they are closer to the VCO and can therefore filter out
some noise and spurs better than external components. For
this reason, a common strategy is to minimize the internal
loop filter resistors and then design for the largest internal ca-
pacitor values that permit a wide enough loop bandwidth. In
some situations where spurs requirements are very stringent
and there is margin on phase noise, it might make sense to
design for a loop filter with integrated resistor values that are
larger than their minimum value.
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