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2.4GHz Monolithic
Voltage-Controlled Oscillators
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V CC = +3.0V, V TUNE = +0.4V to +2.4V, V SHDN ≤ 2V, T A = +25°C, unless otherwise noted.)
MAX2751
NORMALIZED HARMONIC
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
PHASE NOISE
-2
-3
-4
-5
OUTPUT POWER vs. TEMPERATURE
Δ MKR
-30.00dB
OUTPUT SPECTRUM
Δ = 30dBc
Δ = 48dBc
0.1
1
10
-40
-20
0
20
40
60
80
? O
2? O
3? O
OFFSET FREQUENCY (MHz)
OSCILLATOR TURN-ON TIME
0
-10
-20
-30
-40
-50
TEMPERATURE ( ° C)
0
-10
-20
-30
-40
-50
OSCILLATOR TURN-OFF TIME
FREQUENCY
-60
-70
-80
-90
-100
8μs
-60
-70
-80
-90
-100
4μs
0
2
4
6
8
10 12 14 16 18 20
0
2
4
6
8
10 12 14 16 18 20
TIME ( μ s)
TIME ( μ s)
Pin Description
4
PIN
1
2
3
4
5
6
7
8
NAME
BYP
TUNE
GND
SHDN
V CC1
V CC2
OUT
GND
FUNCTION
VCO Bypass. Bypass with a 0.1μF capacitor to GND.
Oscillator Frequency Tuning Voltage Input. High-impedance input with a voltage input range of +0.4V
(low frequency) to +2.4V (high frequency).
Ground Connection for Oscillator and Biasing. Requires a low-inductance connection to the circuit
board ground plane.
Shutdown Logic Input. A high-impedance input logic level low disables the device and reduces
supply current to less than 1.0μA. A logic level high enables the device.
Bias and Oscillator DC Supply Voltage Connection. Bypass separately from PIN6 with a 220pF
capacitor to GND for low noise and low spurious content performance from the oscillator.
Output Buffer DC Supply Voltage Connection. Bypass separately from PIN5 with a 220pF capacitor to
GND for best high frequency performance.
Buffered Oscillator Output. Incorporates an internal DC blocking capacitor. OUT is internally matched
to 50 Ω .
Ground Connection for Output Buffer. Requires a low-inductance connection to the circuit board
ground plane.
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