MC100EL1648DTR2G ON Semiconductor, MC100EL1648DTR2G Datasheet - Page 8

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MC100EL1648DTR2G

Manufacturer Part Number
MC100EL1648DTR2G
Description
IC OSC VOLT CONTROL LP 5V 8TSSOP
Manufacturer
ON Semiconductor
Series
100ELr
Type
Voltage Controlled Oscillator (VCO)r
Datasheet

Specifications of MC100EL1648DTR2G

Frequency
1.1GHz
Voltage - Supply
4.2 V ~ 5.5 V
Current - Supply
19mA
Operating Temperature
-40°C ~ 85°C
Package / Case
8-TSSOP
Count
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
MC100EL1648DTR2GOS
Point
used to determine the desired frequency of operation as
shown in Figure 8, tank option #2. The tank circuit
components have direct impact on the tuning sensitivity, I
and phase noise performance. Fixed frequency of the tank
circuit is usually realized by an inductor and capacitor (LC
network) that contains a high Quality factor (Q). The plotted
curve indicates various fixed frequencies obtained with a
single inductor and variable capacitor. The Q of the
components in the tank circuit has a direct impact on the
resulting phase noise of the oscillator. In general, when the
Q is high the oscillator will result in lower phase noise.
should be used in the tank circuit at high frequencies. These
0.1 mF
Test
The MC100EL1648 external tank circuit components are
Only high quality surface−mount RF chip capacitors
570
470
370
270
170
−30
70
0
L = Micro Metal torroid #T20−22, 8 turns #30
C = 3.0−35 pF Variable Capacitance (@ 10 pF)
Note 1 Capacitor for tank may be variable type.
(See Tank Circuit #3.)
Note 2 Use high impedance probe (> 1 MW ).
8 pin (14 pin) lead package
0.3
Q
L
≥ 100
Enameled Copper wire (@ 40 nH)
Figure 8. Fixed Frequency LC Tank
Tank #2
300
L
V
EE
100 mF
8 (10)
1 (12)
CAPACITANCE (pF)
C
0.1 mF
500
Measured Frequency (MHz)
Calculated Frequency (MHz)
0.01 mF
3 (1)
1000
6 (7) 7 (8)
V
0.1 mF
CC
2000
FIXED FREQUENCY MODE
0.1 mF
5 (5)
2 (14)
10000
http://onsemi.com
4 (3)
F
0.1 mF
OUT
EE
,
8
capacitors should have very low dielectric loss (high−Q). At
a minimum, the capacitors selected should be operating at
100 MHz below their series resonance point. As the desired
frequency of operation increases, the values of the tank
capacitor will decrease since the series resonance point is a
function of the capacitance value. Typically, the inductor is
realized as a surface−mount chip or a wound coil. In
addition, the lead inductance and board inductance and
capacitance also have an impact on the final operating point.
The following equation will help to choose the appropriate
values for your tank circuit design.
Where
inductance/capacitance versus frequency with one known
tank component. This helps the designer of the tank circuit
to choose desired value of inductor/capacitor component for
the wanted frequency. The lead inductance and board
inductance and capacitance will also have an impact on the
tank component values (inductor and capacitor).
Figure 9 and Figure 10 represent the ideal curve of
50
45
40
35
30
25
20
15
10
50
45
40
35
30
25
20
15
10
5
0
5
0
400
400
Figure 10. Inductor Value Known (4 nH)
Figure 9. Capacitor Value Known (5 pF)
Capacitance vs. Frequency with 4 nH Inductance
Inductance vs. Frequency with 5 pF Cap
L
C
700
700
T
T
f 0 +
= Total Inductance
= Total Capacitance
FREQUENCY (MHz)
FREQUENCY (Hz)
2p
1000
1000
L T * C T
1
1300
1300
160
160

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