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MAX2620 Datasheet(PDF) 10 Page - Maxim Integrated Products

Part No. MAX2620
Description  10MHz to 1050MHz Integrated RF Oscillator with Buffered Outputs
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX2620 Datasheet(HTML) 10 Page - Maxim Integrated Products

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10MHz to 1050MHz Integrated
RF Oscillator with Buffered Outputs
10
______________________________________________________________________________________
(see
Typical Operating Circuit) as small a value as pos-
sible while still maintaining desired frequency and tun-
ing range to maximize loaded Q.
There are many good references on the topic of oscilla-
tor design. An excellent reference is “The Oscillator
as a Reflection Amplifier, an Intuitive Approach to
Oscillator Design,” by John W. Boyles,
Microwave
Journal, June 1986, pp. 83–98.
Output Matching Configuration
Both of the MAX2620’s outputs (OUT and OUT) are
open collectors. They need to be pulled up to the sup-
ply by external components. An easy approach to this
pull-up is a resistor. A 50
Ω resistor value would inher-
ently match the output to a 50
Ω system. The Typical
Operating Circuit shows OUT configured this way.
Alternatively, a choke pull-up (Figure 1), yields greater
output power (approximately -8dBm at 900MHz).
When maximum power is required, use an inductor as
the supply pull-up, and match the inductor’s output
impedance to the desired system impedance. Table 1
in the
Typical Operating Characteristics shows recom-
mended load impedance presented to OUT and OUT
for maximum power transfer. Using this data and stan-
dard matching-network synthesis techniques, a match-
ing network can be constructed that will optimize power
output into most load impedances. The value of the
inductor used for pull-up should be used in the synthe-
sis of the matching network.
1
2
3
4
8
7
6
5
OUT
VCC2
GND
OUT
SHDN
FDBK
TANK
VCC1
MAX2620
µMAX
TOP VIEW
__________________Pin Configuration
MAX2620
C5
C6
Rp
L1
Rn
C3
INDUCTOR
OR
CERAMIC
RESONATOR
VARACTOR+
COUPLING
TEST PORT
MEASUREMENT
(FIGURE 1)
RESONANT TANK MODEL
MAX2620 PACKAGE MODEL
PCB
PARASITICS
C4
C04
2.4pF
C03
2.4pF
C17
CD1
CSTRAY
Figure 5. Electrical Model of MAX2620 Circuit


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