Datasheet

45MHz to 650MHz, Integrated IF
VCOs with Differential Output
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2605–MAX2609 EV kits, V
CC
= +2.7V to +5.5V, V
TUNE
= 0.4V to 2.4V, T
A
= -40°C to +85°C, unless otherwise noted. Typical val-
ues are at V
CC
= +2.75V, V
TUNE
= 1.5V, and T
A
= +25°C.) (Note 1)
Note 1: Production tested at T
A
= +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 ≥ Q
MIN
. For MAX2605/MAX2606/MAX2607, Q
MIN
= 35;
for MAX2608/MAX2609, Q
MIN
= 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, L
F
. The application frequency limits are guaranteed by design and characterization.
Note 5: The guaranteed (tested) limits ƒ
MIN
and ƒ
MAX
are measured at V
TUNE
= 0.4V and V
TUNE
= 2.4V, respectively. Passing
requirements are: ƒ ≤ ƒ
MIN
at V
TUNE
= 0.4 and ƒ ≥ ƒ
MAX
at V
TUNE
= 2.4V. The nominal frequency of oscillation is defined by
the inductor.
Note 6: Describes peak tuning gain, which occurs at V
TUNE
= 0.4V.
Note 7: Measurement at OUT+ or OUT- matched for optimum power transfer into 50Ω 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 V
CC
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
MAX2605/9-01
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
MAX2609
MAX2605
MAX2606MAX2607MAX2608
0
0.02
0.06
0.04
0.08
0.10
-40 0-20 20 40 60 80
TUNE INPUT LEAKAGE CURRENT
vs. TEMPERATURE
MAX2605/9-02
TEMPERATURE (°C)
LEAKAGE CURRENT (nA)
45
50
55
60
65
0 1.00.5 1.5 2.0 2.5 3.0
MAX2605
VCO TUNING CURVE
MAX2605/9-03
V
TUNE
(V)
FREQUENCY (MHz)
Typical Operating Characteristics
(MAX260_ EV kit, V
CC
= +2.75V, V
TUNE
= 1.4V, T
A
= +25°C, unless otherwise noted.)
dBcEven-Order Harmonics -30Differential, R
L
= 50Ω each side
PARAMETER MIN TYP MAX UNITS
60
CONDITIONS
MAX2605
120
MAX2606
480
MAX2608
220
MAX2607
Supply Pushing (Note 9)
720
kHz/V
MAX2609
MAX2605–MAX2609
4
Maxim Integrated