MAX2620 datasheet(10/12 Pages) MAXIM | 10MHz to 1050MHz Integrated RF Oscillator with Buffered Outputs

Part No.	MAX2620

Description	10MHz to 1050MHz Integrated RF Oscillator with Buffered Outputs

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Manufacturer	MAXIM [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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