LMX2325TM National Semiconductor, LMX2325TM Datasheet - Page 21

• Manufacturer Part Number: LMX2325TM
• Description: IC FREQ SYNTHESIZER 20-TSSOP
• Manufacturer: National Semiconductor
• Series: PLLatinum™r
• Type: PLL Frequency Synthesizerr

Specifications of LMX2325TM

• Pll: Yes
• Input: CMOS, TTL
• Output: CMOS
• Number Of Circuits: 1
• Ratio - Input:output: 1:1
• Differential - Input:output: Yes/No
• Frequency - Max: 2.5GHz
• 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: *LMX2325TM

Application Information
the transistors used, the V
0.1V).
Knowing these parameters along with the desired current
allow us to design a simple external charge pump. Separat-
ing the pump up and pump down circuits facilitates the nodal
analysis and give the following equations.
EXAMPLE
Typical Device Parameters
Typical System Parameters V
r’s under 1 mA loads. ( p’s V
OL
drop of p, and the V
V
V
n
P
cntl
p
OL
=100,
= 5.0V;
= 0.0V, V
= 0.5V–4.5V;
<
0.1V and ( r,s V
p
(Continued)
= 50
r
= 5.0V
OH
drop of
OH
<
21
Design Parameters
Therefore select
FIGURE 14.
I
Vfn = Vfp = 0.8V
I
V
V
SINK
rmax
R8
OL p
= V
= I
= I
= V
pmax
R5
SOURCE
OH p
= 0.3V
= 1 mA
= 100 mV
= 5.0 mA;
DS012339-39
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