13
ISOMET
The full range power adjustment is shown below.
Settings: RDAC3 = 0 (R_W3=0k) and RDAC0 = 255 (R_W0=0k).
The V_Control scale equates to 0 – 255 adjustment range on RDAC1 (W1) or RDAC2 (W2)
Digital Pot RF Control
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
V_Control (Volts)
R
F
P
o
w
e
r W
By adjusting the values of RDAC0 and RDAC3 it is possible to increase the adjustment resolution of
the 8-bit power level control at 40.0 MHz (RDAC1) and 50.7MHz.(RDAC2) over a defined range.
A typical Digital Power curve is shown below. In this case settings are: RDAC3 = 255 (R_W3=10k)
and RDAC0 =t 200 (R_W0=2K)
Digital Pot RF Control
20
30
40
50
60
70
80
90
100
110
120
0
16 32
48 64
80 96 112 128 144 160 176 192 208 224 240 256
Digital Value (dec)
R
F
P
o
w
e
r W
