Datasheet

45MHz to 650MHz, Integrated IF
VCOs with Differential Output
MAX2608
REQUIRED INDUCTANCE vs. DESIRED VCO FIXED FREQUENCY
40.0
38.0
37.0
32.0
29.0
27.0
25.0
22.0
20.0
17.0
15.0
13.0
11.0
REQUIRED INDUCTANCE (nH)
310 320 330 340 350 360 370 380 390 400 410 420 470
9.0
300 480
41.0
420
430
440 450 460 490 500
36.0
35.0
34.0
33.0
31.0
30.0
28.0
26.0
24.0
23.0
21.0
19.0
18.0
16.0
14.0
12.0
10.0
EFFECTIVE INDUCTANCE
FROM IND TO GND
INDUCTOR VALUE
MOUNTED ON EV KIT
MEASUREMENT CONDITIONS
V
CC
= 2.75V, T
A
= 25°C,
R
LOAD
= 100Ω||50Ω (100Ω RESISTIVE PULL-UP PARALLELED WITH 50Ω
VNA IMPEDANCE), UNUSED OUTPUT TERMINATED IN 50Ω,
PCB PARASITIC SHUNT CAPACITANCE (IND TO GND) = 0.45pF
THE INDUCTANCE LISTED IS THE PRECISE NOMINAL INDUCTANCE VALUE
REQUIRED FROM IND TO GND IN ORDER TO GUARANTEE THE VCO
CAN TUNE TO THE DESIRED FIXED FREQUENCY, OVER ALL OPERATING
CONDITIONS AND WORST-CASE COMPONENT
VALUES (±2% INDUCTOR AND IC PROCESS VARIATION).
Figure 4. MAX2608 Required Inductance vs. Desired VCO Fixed Frequency
MAX2605–MAX2609
10
Maxim Integrated