Datasheet

45MHz to 650MHz, Integrated IF
VCOs with Differential Output
MAX2609
REQUIRED INDUCTANCE vs. DESIRED VCO FIXED FREQUENCY
13.5
13.0
11.5
11.0
10.0
9.5
9.0
8.5
7.5
6.5
6.0
5.5
5.0
REQUIRED INDUCTANCE (nH)
510
520
530 540 550 560 570
580
590 600 610 620 630
3.5
500
640
650
14.0
EFFECTIVE INDUCTANCE
FROM IND TO GND
INDUCTOR VALUE
MOUNTED ON EV KIT
12.5
12.0
10.5
8.0
7.0
4.5
4.0
DESIRED VCO FIXED FREQUENCY (MHz)
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 5. MAX2609 Required Inductance vs. Desired VCO Fixed Frequency
MAX2605–MAX2609
Maxim Integrated
11