Dual 50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital 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 maximimum gain, RF ports are
driven from 50ω sources, AMPSET = 0, PD_1 = PD_2 = 0, P IN = -20dBm, f RF = 350MHz, T C = +25°C, unless otherwise noted.)
REVERSE GAIN OVER ATTENUATOR
SETTING vs. RF FREQUENCY
ATTENUATOR PHASE CHANGE
BETWEEN STATES vs. RF FREQUENCY
CHANNEL ISOLATION vs. RF FREQUENCY
(MAXIMUM GAIN)
-30
-40
ATTEN 0dB
60
50
40
REFERENCED TO HIGH GAIN STATE
POSITIVE PHASE = ELECTRICALLY SHORTER
75
65
RELATIVE POWERS AT RF OUTPUTS
30
-50
ATTEN 31dB
20
55
-60
-70
10
0
-10
45
35
CH1 TO CH2
CH2 TO CH1
-20
-80
-30
25
50
250
450
650
850
1050
50
250
450
650
850
1050
50
250
450
650
850
1050
75
RF FREQUENCY (MHz)
CHANNEL ISOLATION vs. RF FREQUENCY
(MINIMUM GAIN)
RELATIVE POWERS AT RF OUTPUTS
9
RF FREQUENCY (MHz)
NOISE FIGURE vs. RF FREQUENCY
9
RF FREQUENCY (MHz)
NOISE FIGURE vs. RF FREQUENCY
65
8
7
T C = +85°C
8
7
55
45
35
CH1 TO CH2
CH2 TO CH1
6
5
4
T C = -40°C
T C = +25°C
6
5
4
V CC = 4.75V, 5.00V, 5.25V
25
3
3
50
250
450
650
850
1050
50
250
450
650
850
1050
50
250
450
650
850
1050
RF FREQUENCY (MHz)
OUTPUT P 1dB vs. RF FREQUENCY
22
RF FREQUENCY (MHz)
22
RF FREQUENCY (MHz)
OUTPUT P 1dB vs. RF FREQUENCY
20
18
T C = -40°C
20
18
V CC = 5.25V
16
14
T C = +85°C
T C = +25°C
16
14
V CC = 4.75V
V CC = 5.00V
12
12
50
250
450
650
850
1050
50
250
450
650
850
1050
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
7
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