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Dual 50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Analog/Digital VGA
Typical Operating Characteristics (continued)
( Typical Application Circuit , V CC = V CC_AMP_1 = V CC_AMP_2 = V CC_RG = 5.0V , 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.)
GAIN vs. ANALOG ATTENUATOR SETTING
GAIN vs. ANALOG ATTENUATOR SETTING
GAIN vs. ANALOG ATTENUATOR SETTING
22
17
12
7
2
1000MHz
50MHz
200MHz
350MHz
22
17
12
7
2
f RF = 350MHz
T C = -40°C, +25°C, +85°C
22
17
12
7
2
f RF = 350MHz
V CC = 4.75V, 5.00V, 5.25V
-3
-8
-13
-18
-3
-8
-13
-18
-3
-8
-13
-18
0
32
64
96
128 160 192 224 256
0
32
64
96
128 160 192 224 256
0
32
64
96
128 160 192 224 256
ANALOG ATTENUATOR SETTING (DAC CODE)
INPUT MATCH vs. ANALOG
ATTENUATOR SETTING
ANALOG ATTENUATOR SETTING (DAC CODE)
OUTPUT MATCH vs. ANALOG
ATTENUATOR SETTING
ANALOG ATTENUATOR SETTING (DAC CODE)
CHANNEL-TO-CHANNEL ISOLATION
vs. RF FREQUENCY
0
-5
-10
50MHz
200MHz
0
-10
1000MHz
10
20
30
BOTH ANALOG ATTENUATORS = CODE 255
-15
-20
40
-30
50MHz, 200MHz, 350MHz
50
-20
-25
-30
1000MHz
350MHz
-40
-50
60
70
80
BOTH ANALOG ATTENUATORS = CODE 0
BOTH DIGITAL ATTENUATORS = 0dB
0
32
64
96
128 160 192 224 256
0
32
64
96
128 160 192 224 256
50
250
450
650
850
1050
ANALOG ATTENUATOR SETTING (DAC CODE)
ANALOG ATTENUATOR SETTING (DAC CODE)
RF FREQUENCY (MHz)
30
40
50
REVERSE ISOLATION OVER ANALOG
ATTENUATOR SETTING vs. RF FREQUENCY
DAC CODE 0
DAC CODE 255
80
60
40
20
S21 PHASE CHANGE
vs. ANALOG ATTENUATOR SETTING
REFERENCED TO HIGH GAIN STATE
1000MHz 350MHz
11
10
9
8
NOISE FIGURE vs. RF FREQUENCY
T C = +85°C
T C = +25°C
60
0
7
70
80
-20
-40
50MHz
200MHz
6
5
T C = -40°C
90
50
250
450 650
RF FREQUENCY (MHz)
850
1050
-60
0
POSITIVE PHASE = ELECTRICALLY SHORTER
32 64 96 128 160 192 224 256
ANALOG ATTENUATOR SETTING (DAC CODE)
4
50
250
450 650
RF FREQUENCY (MHz)
850
1050
8
______________________________________________________________________________________
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