
50MHz to 1000MHz High-Linearity, Serial/
Parallel-Controlled Analog/Digital VGA
Typical Operating Characteristics (continued)
( V CC = +5.0V, LC mode , both attenuators set for maximum gain, P IN = -20dBm, f RF = 200MHz, and T C = +25°C, internal reference
used, unless otherwise noted.)
85
SUPPLY CURRENT vs. V CC
(LOW CURRENT MODE)
22
GAIN vs. RF FREQUENCY
(LOW CURRENT MODE)
22
GAIN vs. RF FREQUENCY
(LOW CURRENT MODE)
T C = +25 ° C
T C = -40 ° C
21
20
T C = -40 ° C
21
20
V CC = 4.75V, 5.00V, 5.25V
75
19
19
18
T C = +25 ° C
18
65
T C = +85 ° C
17
16
T C = +85 ° C
17
16
15
15
55
14
14
4.750
4.857
5.000
5.125
5.250
50
250
450
650
850
1050
50
250
450
650
850
1050
0
V CC (V)
INPUT MATCH OVER DIGITAL ATTENUATOR
SETTING vs. RF FREQUENCY
RF FREQUENCY (MHz)
OUTPUT MATCH OVER DIGITAL ATTENUATOR
SETTING vs. RF FREQUENCY
0
0
RF FREQUENCY (MHz)
INPUT MATCH vs. ANALOG ATTENUATOR
SETTING (LOW CURRENT MODE)
-5
-5
0dB, 1dB, 2dB, 4dB
-5
-10
16dB
1dB, 2dB
0dB, 8dB
-10
8dB
-10
50MHz
-15
-15
-15
1000MHz
200MHz
-20
-20
-20
450MHz
-25
-30
4dB
31dB
-25
-30
16dB, 31dB
-25
-30
50
250
450
650
850
1050
50
250
450
650
850
1050
0
32
64
96
128 160 192 224 256
0
RF FREQUENCY (MHz)
OUTPUT MATCH vs. ANALOG ATTENUATOR
SETTING (LOW CURRENT MODE)
11
RF FREQUENCY (MHz)
NOISE FIGURE vs. RF FREQUENCY
(LOW CURRENT MODE)
11
DAC CODE
NOISE FIGURE vs. RF FREQUENCY
(LOW CURRENT MODE)
-5
-10
450MHz
1000MHz
10
9
T C = +85°C
T C = +25°C
10
9
V CC = 4.75V, 5.00V, 5.25V
-15
8
7
8
7
-20
6
6
-25
50MHz
200MHz
5
T C = -40°C
5
-30
4
4
0
32
64
96
128 160 192 224 256
50
250
450
650
850
1050
50
250
450
650
850
1050
DAC CODE
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
12
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