MAX2608EUT-T datasheet(4/15 Pages) MAXIM | 45MHz to 650MHz, Integrated IF VCOs with Differential Output

Part No.	MAX2608EUT-T

Description	45MHz to 650MHz, Integrated IF VCOs with Differential Output

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Manufacturer	MAXIM [Maxim Integrated Products]

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4 / 15 page

45MHz to 650MHz, Integrated IF

VCOs with Differential Output

4

_______________________________________________________________________________________

AC ELECTRICAL CHARACTERISTICS (continued)

(MAX2605–MAX2609 EV kits, VCC = +2.7V to +5.5V, VTUNE = 0.4V to 2.4V, TA = -40°C to +85°C, unless otherwise noted. Typical val-

ues are at VCC = +2.75V, VTUNE = 1.5V, and TA = +25°C.) (Note 1)

Note 1: Production tested at TA = +25°C. Maximum and minimum over temperature limits are guaranteed by design and

characterization.

Note 2: Supply current is measured while the part is oscillating and inductor Q

≥ QMIN. For MAX2605/MAX2606/MAX2607, QMIN = 35;

for MAX2608/MAX2609, QMIN = 40.

Note 3: The DC output current is the total available output signal current.

Note 4: Application range of the part is achieved using external inductance as specified in Figures 1-5 and shown in Figure 6. The inter-

nal varactors support center frequencies of 45MHz to 650MHz. The center frequency is defined by the value of the external

inductor element, LF. The application frequency limits are guaranteed by design and characterization.

Note 5: The guaranteed (tested) limits ƒMIN and ƒMAX are measured at VTUNE = 0.4V and VTUNE = 2.4V, respectively. Passing

requirements are: ƒ

≤ ƒMIN at VTUNE = 0.4 and ƒ ≥ ƒMAX at VTUNE = 2.4V. The nominal frequency of oscillation is defined by

the inductor.

Note 6: Describes peak tuning gain, which occurs at VTUNE = 0.4V.

Note 7: Measurement at OUT+ or OUT- matched for optimum power transfer into 50

Ω load near the center of the operating frequency

range.

Note 8: The phase-noise specifications listed apply to the typical operating circuit shown in Figure 6. Apply over the entire operating

frequency range of the MAX2605–MAX2609.

Note 9: Supply pushing is measured with VCC stepped from +2.7V to +3.2V.

1.0

1.5

2.0

3.0

2.5

3.5

4.0

-40

0

-20

20

40

60

80

SUPPLY CURRENT

vs. TEMPERATURE

TEMPERATURE (°C)

MAX2609

MAX2605

MAX2606

MAX2607

MAX2608

0

0.02

0.06

0.04

0.08

0.10

-40

0

-20

20

40

60

80

TUNE INPUT LEAKAGE CURRENT

vs. TEMPERATURE

TEMPERATURE (

°C)

45

50

55

60

65

0

1.0

0.5

1.5

2.0

2.5

3.0

MAX2605

VCO TUNING CURVE

VTUNE (V)

Typical Operating Characteristics

(MAX260_ EV kit, VCC = +2.75V, VTUNE = 1.4V, TA = +25°C, unless otherwise noted.)

dBc

Even-Order Harmonics

-30

Differential, RL = 50

Ω each side

PARAMETER

MIN

TYP

MAX

UNITS

60

CONDITIONS

MAX2605

120

MAX2606

480

MAX2608

220

MAX2607

Supply Pushing (Note 9)

720

kHz/V

MAX2609

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