Datasheet

MAX2870
23.5MHz to 6000MHz Fractional/
Integer-N Synthesizer/VCO
7Maxim Integrated
Typical Operating Characteristics (continued)
(Measured with MAX2870 EV Kit. V
CC_
= 3.3V, V
GND_
= 0V, f
REF_IN
= 50MHz, T
A
= +25°C, see the Testing Conditions Table.)
Typical Operating Characteristics Testing Conditions Table
TOC TITLE
fREF
(MHz)
fPFD
(MHz)
REGISTER
SETTINGS
(hex)
LOOP
FILTER
BW (Hz)
MAX2870 EV KIT COMPONENT VALUES
COMMENTS
C13
(F)
R1 + R2
(I)
C14
(F)
R0
(I)
C12
(F)
3.0GHz VCO
OPEN-LOOP
PHASE NOISE
vs. FREQUENCY
N/A N/A
80B40000,
80000141,
0000405A,
XX00013,
648020FC,
00000005
N/A N/A N/A N/A N/A N/A
VCO bits set
for 3GHz
output,
VAS_SHDN = 1
4.5GHz VCO
OPEN-LOOP
PHASE NOISE
vs. FREQUENCY
N/A N/A
80B40000,
80000141,
0000405A,
XX00013
648020FC,
00000005
N/A N/A N/A N/A N/A N/A
VCO bits set
for 4.5GHz
output,
VAS_SHDN = 1
6.0GHz VCO
OPEN-LOOP
PHASE NOISE
vs. FREQUENCY
N/A N/A
80B40000,
80000141
0000405A
XX00013,
648020FC
00000005
N/A N/A N/A N/A N/A N/A
VCO bits set
for 6.0GHz
output,
VAS_SHDN = 1
SUPPLY CURRENT vs. FREQUENCY
(TWO CHANNELS ACTIVE,
MAXIMUM OUTPUT POWER)
MAX2780 toc16
FREQUENCY (MHz)
SUPPLY CURRENT (mA)
1k100
120
140
160
180
200
220
240
260
280
300
100
10 10k
T
A
= +25°C
T
A
= +85°C
T
A
= -40°C
PLL LOCK vs. TIME
MAX2780 toc17
TIME (µs)
FREQUENCY (GHz)
15010050
3.00
3.02
3.04
3.06
3.08
2.98
0 200
FASTLOCK OFF
FASTLOCK ON