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Dual 50MHz to 1000MHz High-Linearity,
Serial/Analog-Controlled VGA
Typical Operating Characteristics (continued)
( Typical Application Circuit , V CC = V CC_AMP_1 = V CC_AMP_2 = V CC_RG = +5V , attenuators are set for maximum gain, RF ports are
driven from 50 I sources, AMPSET = 0, PD_1 = PD_2 = 0, P IN = -20dBm, f RF = 350MHz, and T C = +25 N C, unless otherwise noted.)
CHANNEL–TO–CHANNEL ISOLATION
vs. RF FREQUENCY
REVERSE ISOLATION OVER ANALOG
ATTENUATOR SETTING vs. RF FREQUENCY
S21 PHASE CHANGE vs. ANALOG
ATTENUATOR SETTING
10
30
80
REFERENCED TO HIGH GAIN STATE
20
30
40
BOTH ANALOG
ATTENUATORS = CODE 255
40
50
DAC CODE 0
DAC CODE 255
60
40
20
POSITIVE PHASE = ELECTRICALLY
SHORTER
1000MHz
350MHz
60
50
0
60
BOTH ANALOG
ATTENUATORS = CODE 0
70
-20
50MHz
200MHz
70
80
-40
80
50
250
450
650
850
1050
90
50
250
450
650
850
1050
-60
0
32
64
96
128 160 192 224 256
8
RF FREQUENCY (MHz)
NOISE FIGURE vs. RF FREQUENCY
8
RF FREQUENCY (MHz)
NOISE FIGURE vs. RF FREQUENCY
21
ANALOG ATTENUATOR SETTING (DAC CODE)
OUTPUT P 1dB vs. RF FREQUENCY
7
6
5
4
3
T C = +85°C
T C = +25°C
T C = -40°C
7
6
5
4
3
V CC = 4.75V, 5.00V, 5.25V
19
17
15
13
T C = +85°C
T C = -40°C
T C = +25°C
2
50
250
450
650
850
1050
2
50
250
450
650
850
1050
11
50
250
450
650
850
1050
21
RF FREQUENCY (MHz)
OUTPUT P 1dB vs. RF FREQUENCY
50
RF FREQUENCY (MHz)
OUTPUT IP3 vs. RF FREQUENCY
50
RF FREQUENCY (MHz)
OUTPUT IP3 vs. RF FREQUENCY
19
17
V CC = 4.75V
V CC = 5.25V
45
40
P OUT = 0dBm/TONE
T C = -40°C
45
40
V CC = 5.25V
P OUT = 0dBm/TONE
35
35
V CC = 5.00V
15
V CC = 5.00V
30
T C = +85°C
30
V CC = 4.75V
13
25
T C = +25°C
25
11
50
250
450
650
850
1050
20
50
250
450
650
850
1050
20
50
250
450
650
850
1050
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
_______________________________________________________________________________________
7
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