50MHz to 1000MHz High-Linearity, Serial/
Parallel-Controlled Analog/Digital VGA
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.)
11
NOISE FIGURE vs. RF FREQUENCY
11
NOISE FIGURE vs. RF FREQUENCY
21
OUTPUT P1dB vs. RF FREQUENCY
T C = +85 ° C
10
9
T C = +85 ° C
T C = +25 ° C
10
9
V CC = 4.75V
20
19
T C = +25 ° C
8
8
V CC = 5.00V
18
7
6
5
4
T C = -40 ° C
7
6
5
4
V CC = 5.25V
17
16
15
T C = -40 ° C
50
250
450
650
850
1050
50
250
450
650
850
1050
50
250
450
650
850
1050
RF FREQUENCY (MHz)
OUTPUT P1dB vs. RF FREQUENCY
RF FREQUENCY (MHz)
OUTPUT IP3 vs. RF FREQUENCY
RF FREQUENCY (MHz)
OUTPUT IP3 vs. RF FREQUENCY
21
50
P OUT = 0dBm/TONE
50
P OUT = 0dBm/TONE
20
V CC = 5.25V
45
45
19
18
17
V CC = 5.00V
40
T C = +25 ° C
40
V CC = 5.00V
V CC = 5.25V
V CC = 4.75V
35
T C = -40 ° C
35
V CC = 4.75V
16
T C = +85 ° C
15
30
30
50
250
450
650
850
1050
50
250
450
650
850
1050
50
250
450
650
850
1050
RF FREQUENCY (MHz)
OUTPUT IP3
vs. DIGITAL ATTENUATOR STATE
RF FREQUENCY (MHz)
OUTPUT IP3
vs. ANALOG ATTENUATOR STATE
RF FREQUENCY (MHz)
2nd HARMONIC vs. RF FREQUENCY
42
T C = +25 ° C LSB, USB
P OUT = -3dBm/TONE
RF = 200MHz
45
P OUT = -3dBm/TONE
RF = 200MHz
80
P OUT = 3dBm
41
40
70
T C = -40 ° C
40
T C = +85 ° C LSB, USB
35
60
T C = +25 ° C
39
T C = -40 ° C LSB, USB
30
T C = -40 ° C, +25 ° C, +85 ° C TONE = LSB, USB
50
T C = +85 ° C
38
0
4
8
12
16
20
24
28
32
25
0
32
64
96
128 160 192 224 256
40
50
250
450
650
850
1050
DIGITAL ATTENUATOR STATE (dB)
DAC CODE
RF FREQUENCY (MHz)
8
_______________________________________________________________________________________
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