
50MHz to 1000MHz High-Linearity,
Serial/Analog-Controlled VGA
Typical Application Circuit
V CC
C12
ANALOG_VCTRL
VREF_IN
C11
R4
C10
C9
RF INPUT
+
40
39
38
37
36
35
34
33
32
31
GND
VREF_SELECT
VDAC_EN
1
2
3
ANALOG ATTENUATOR
30
29
28
GND
GND
GND
DATA
CLK
4
5
VREF
MAX2067
27
26
GND
GND
C8
V DD
C1
CS
VDD_LOGIC
GND
GND
GND
6
7
8
9
10
DAC
EP
DRIVER AMP
25
24
23
22
21
GND
GND
GND
GND
VCC_AMP
V CC
11
12
13
14
15
16
17
18
19
20
R1
R2
C6
C7
V CC
C2
C3
L1
C4
R1A*
R3
RF OUTPUT
NOTE: REMOVE R4 AND C10 WHEN DRIVING
ANALOG_VCTRL WITH AN EXTERNAL VOLTAGE.
*IN LC MODE, R1A IS A 10nF CAPACITOR.
SEE TABLE 5 FOR DETAILS.
22
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