VCO IC ( )

VCO
(
1
IC
)
VCO
PCB
( IF )
( VCO )
( IF ) VCO
Maxim
IC ( MAX2605 – MAX2609 )
VCO
PCB
VCO
Maxim
MAX2605–MAX2609
5 IC
650MHz
VCO
(
6mm x10mm
VCO
1)
VCO
45MHz
(
)
IC
( +0.4VDC +2.4VDC )
IC
( PLL )
MAX2605–MAX2609
+2.7VDC
+5.5VDC
( 2)
IC
6
SOT23
VCC
IND 1
6
OUT+
GND 2
5
VCC
TUNE 3
4
OUT-
OUT
MAX2605–MAX2609
2. MAX2605 – MAX2609
PCB
TUNE
1.
1
VCO
2000
8
Microwaves & RF
3
VCO IC
6
SOT23
MAX2605
100kHz
:
100kHz
150MHz 300MHz
300MHz 500MHz
500MHz 650MHz
45MHz 70MHz
-117dBc/Hz
70MHz 150MHz
-112dBc/Hz ( MAX2606 ) ;
-107dBc/Hz ( MAX2607 ) ;
-100dBc/Hz ( MAX2608 ) ;
-93dBc/Hz ( MAX2609 )
IC
:
VCO
VCO
VCO
(
(Q)
)
3
IC
VCO
(
)
MAX2605–MAX2609
Q
MAX2605
Q
PNP
IC
PMOS
VCO
VCO
VCO
Maxim
MAX2605–MAX2609
VCO
Maxim
MAX2605 – MAX2609
( f MAX
(
VTUNE )
IC
( fOSC ) ≤ fMIN VTUNE = 2.4V
Colpitts
(
)
fMIN )
0.4V
IC
VCC
VCO IC
OUT+
IND
BIAS
LF
AMPLITUDE
CONTROL
TUNE
MAX2605–MAX2609
OUT-
GND
3.
MAX2605 – MAX2609 VCO IC
4
fOSC ≥ fMAX
±2%
( <0.5%)
PCB
IND
SMT
VCO
VCO
L F2
VCO
MAX2605–MAX2609
MAX2605 – MAX2609 VCO
VCO
:
;
1)
(
2)
( fNOM )
VCO
1)
( 5)
/
4)
IND
PLL
(
( OUT- OUT+)
( VCC )
( LF)
( SMT )
1.2
LF1
LF2
LF1
Q
LF2 L F1
LF – LF1
Q
LF2
SMT
20%
Q
/
3dB
OUTV CC
OUT-
OUT+
OUT+
PCB
VCC
MAX2608/MAX2609
OUT-
OUT+
VCC
C2
1
6
OUT+
R2
LF
2
5
R1
TUNE
3
4
OUTC1
FROM PLL LOOP
FILTER OUTPUT
4.
MAX2605 – MAX2609 VCO IC
5
TO PLL/MIXER THROUGH A
RESISTOR OR
CAPACITOR DIVIDER
NETWORK
/
MAX2607*
REQUIRED INDUCTANCE vs. DESIRED VCO FIXED FREQUENCY
170
MEASUREMENT CONDITIONS
VCC = 2.75V, TA = +25°C,
RLOAD = 100Ω||50Ω (100Ω RESISTIVE PULLUP PARALLELED WITH 50Ω
VNA IMPEDANCE), UNUSED OUTPUT TERMINATED IN 50Ω,
PCB PARASITIC SHUNT CAPACITANCE (IND TO GND) = 0.45pF
160
150
THE INDUCTANCE LISTED IS THE PRECISE NOMINAL INDUCTANCE VALVE
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).
REQUIRED INDUCTANCE (nH)
140
130
120
110
100
90
EFFECTIVE INDUCTANCE
FROM IND TO GND
80
70
60
50
INDUCTOR VALUE
MOUNTED ON EV KIT
40
30
150 160 170 180 190 200
*FIGURE FROM MAX2607 DATA SHEET
5.
210
220 230 240
250 260 270 280 290 300
DESIRED VCO FIXED FREQUENCY (MHz)
MAX2607 VCO IC
( 150MHz
300MHz )
( LF )
/
VCO
MAX2605–MAX2609
MAX2605 – MAX2609
!
Maxim
MAX2605–MAX2609
VCO
6
MAX2605 – MAX2609
VCO
VCO
$0.03