Datasheet

MAX2065
50MHz to 1000MHz High-Linearity, Serial/
Parallel-Controlled Analog/Digital VGA
_______________________________________________________________________________________ 7
GAIN vs. ANALOG ATTENUATOR SETTING
MAX2065 toc13
DAC CODE
GAIN (dB)
12864 96 224160 19232
12
17
22
-18
7
2
-3
-8
-13
0 256
T
C
= -40°C, +25°C, +85°C
RF = 200MHz
GAIN vs. ANALOG ATTENUATOR SETTING
MAX2065 toc14
DAC CODE
GAIN (dB)
12864 96 224160 19232
12
17
22
-18
7
2
-3
-8
-13
0 256
V
CC
= 4.75V, 5.00V, 5.25V
RF = 200MHz
INPUT MATCH
vs. ANALOG ATTENUATOR SETTING
MAX2065 toc15
DAC CODE
INPUT MATCH (dB)
12864 96 224160 19232
-5
0
-30
-10
-15
-20
-25
0 256
50MHz
1000MHz
200MHz
450MHz
OUTPUT MATCH
vs. ANALOG ATTENUATOR SETTING
MAX2065 toc16
DAC CODE
OUTPUT MATCH (dB)
12864 96 224160 19232
-5
0
-30
-10
-15
-20
-25
0 256
50MHz
1000MHz
200MHz
450MHz
REVERSE ISOLATION OVER ANALOG
ATTENUATOR SETTING vs. RF FREQUENCY
MAX2065 toc17
RF FREQUENCY (MHz)
REVERSE ISOLATION (dB)
250 450 650 850
-30
-70
-40
-50
-60
50 1050
DAC CODE 0
DAC CODE 255
S21 PHASE CHANGE
vs. ANALOG ATTENUATOR SETTING
MAX2065 toc18
DAC CODE
S21 PHASE CHANGE (DEG)
32 64 96 128 160 224192
80
-10
60
40
20
70
50
30
0
10
0 258
1000MHz
450MHz
200MHz
50MHz
POSITIVE PHASE = ELECTRICALLY SHORTER
REFERENCED TO HIGH GAIN STATE
S21 PHASE CHANGE OVER DIGITAL
ATTENUATOR SETTING vs. RF FREQUENCY
MAX2065 toc10
RF FREQUENCY (MHz)
S21 PHASE CHANGE (DEG)
850450 650250
40
50
60
-10
30
20
10
0
50 1050
POSITIVE PHASE = ELECTRICALLY SHORTER
REFERENCED TO HIGH GAIN STATE
GAIN OVER ANALOG ATTENUATOR
SETTING vs. RF FREQUENCY
MAX2065 toc11
RF FREQUENCY (MHz)
GAIN (dB)
850450 650250
12
17
22
-18
7
2
-3
-8
-13
50 1050
DAC CODE 0
DAC CODE 32
DAC CODE 128
DAC CODE 256
DAC CODE 64
GAIN vs. ANALOG ATTENUATOR SETTING
MAX2065 toc12
DAC CODE
GAIN (dB)
12864 96 224160 19232
12
17
22
-18
7
2
-3
-8
-13
0 256
50MHz
200MHz
1000MHz
450MHz
Typical Operating Characteristics (continued)
(V
CC
= +5.0V, HC mode, both attenuators set for maximum gain, P
IN
= -20dBm, f
RF
= 200MHz, and T
C
= +25°C, internal DAC refer-
ence used, unless otherwise noted.)