XR-2209CN 查看數據表（PDF） - Exar Corporation

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XR-2209CN

Voltage-Controlled Oscillator

Exar Corporation 

XR-2209

Timing Capacitor (Pins 2 and 3)

The oscillator frequency is inversely proportional to the

timing capacitor, C. The minimum capacitance value is

limited by stray capacitances and the maximum value by

physical size and leakage current considerations.

Recommended values range from 100pF to 100mF. The

capacitor should be non-polarized.

25

20

15

Typical

Operating

10

Range

5

0

-5

-10

-15

-20

Negative Supply (V)

Figure 5. Operating Range for Unequal Split Supply Voltages

ÎÎÎÎÎÎÎÎÎÎÎ 35 RT=Parallel Combination

ÎÎÎÎÎÎÎÎÎÎÎ 30

of Activated Timing

Resistors

TA=25°C

ÎÎÎÎÎÎÎÎÎÎÎ 25

ÎÎÎÎÎÎÎÎÎÎÎ RT=2kΩ

RT=3kΩ

20

RT=5kΩ

ÎÎÎÎÎÎÎÎÎÎÎ 15

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ 10

RT=20kΩ RT=200kΩ

ÎÎÎÎÎÎÎÎÎÎÎ 5

RT=2MΩ

ÎÎÎÎÎÎÎÎÎÎÎ 0

ÎÎÎÎÎÎÎÎÎÎÎ +4

+6

+8 +10

+12 +14

8 10 12 14 16 18 20 22 24 26 28

Single Supply Voltage (V)

Figure 6. Positive Supply Current, I+ (Measured at Pin 1) vs. Supply Voltage

Rev. 2.02

7

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