LMX2320TM National Semiconductor, LMX2320TM Datasheet - Page 19
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LMX2320TM
Manufacturer Part Number
LMX2320TM
Description
IC FREQ SYNTH 2.0GHZ 20-TSSOP
Manufacturer
National Semiconductor
Series
PLLatinum™r
Type
PLL Frequency Synthesizerr
Datasheet
1.LMX2325TM.pdf
(22 pages)
Specifications of LMX2320TM
Pll
Yes
Input
CMOS, TTL
Output
CMOS
Number Of Circuits
1
Ratio - Input:output
1:1
Differential - Input:output
Yes/No
Frequency - Max
2GHz
Divider/multiplier
Yes/No
Voltage - Supply
2.7 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
20-TSSOP
Frequency-max
2.5GHz
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
*LMX2320TM
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LMX2320TM
Manufacturer:
TI/NSC
Quantity:
5 510
Company:
Part Number:
LMX2320TMC
Manufacturer:
NS
Quantity:
148
Application Information
Converting to standard component values gives the follow-
ing filter values, which are shown in Figure 4 .
Note: *See related equation for K in Charge Pump Current Specification
C1 = 560 pF
R2 = 6.8 k
C2 = 2700 pF
R3 = 27 k
C3 = 56 pF
Definitions. For this example V
approximated using the curves in the Typical Performance Character-
istics for Charge Pump Current vs. D
mA. You may also use K = (2.8 mA/2 rad), but in this case you must
convert K
VCO
FIGURE 9. 20 kHz Loop Filter
to (rad/V) multiplying by 2 .
P
= 3.3V. The value for K can then be
o
Voltage. The units for K are in
DS012339-33
(Continued)
19
MEASUREMENT RESULTS (Example # 2)
The reference spurious level is
filter attenuation and the low spurious noise level of the
LMX2320.
FIGURE 10. PLL Reference Spurs
<
−65 dBc, due to the loop
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DS012339-34