Evaluation Board User Guide
UG-559
Rev. B | Page 5 of 8
Configuration for Decreasing Gain with Increasing
Voltage on GAIN Pin
Figure 5 shows the basic connections of the evaluation board.
MODE is set to low to achieve these results. In this configuration,
turning GAIN ADJ clockwise causes a decrease in applied gain.
At full rotation clockwise, the gain equals 0 dB.
Figure 5. Jumper Configuration for MODE = Low
Configuration for Using AGC Loop
For the application of the AGC loop, set MODE on the
AD8338
to high. Set the DETO jumper (P5) as shown in Figure 6. With
the board configured as illustrated in Figure 6, the signal into
VAGC sets the output rms level.
Figure 6. Jumper Settings for AGC Mode
1
1510-
007
J5
J6
J7
J8
J11
J9
J12
J10
1
1510-
007
J5
J6
J7
J8
J11
J9
J12
J10
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