AD8330 datasheet(30/32 Pages) AD

30 / 32 page

AD8330

Data Sheet

Rev. H | Page 30 of 32

OPTIONS

Table 6 lists the jumpers on the board and their functions.

Table 6. Functions of Jumpers

Name

Function

FLTR

Connects a high-pass filter to the offset control loop

pin. This jumper is normally not installed.

OFST

Disables the offset correction loop. This jumper is

installed for dc or low frequency operation.

Mode up. Install for ascending gain with increasing

VDBS gain control voltage.

DOWN

Mode down. Install for descending gain with

increasing VDBS gain control voltage.

MEASUREMENT SETUP

The basic board connections for a typical measurement are

shown in Figure 71. To minimize circuit-loading effects, a low

capacitance FET probe is recommended for observing input or

output waveforms. Two-pin headers, IN_TEST and OUT_TEST,

are provided for this purpose. The SMA connectors OUT_HI

and OUT_LO can also be used, but the user may need to

account for load capacitance effects.

AD8330-EVALZ BOARD DESIGN

The AD8330-EVALZ is a 4-layer design for maximum ground-

plane area. The evaluation board side silkscreen and wiring

patterns are shown in Figure 72 through Figure 77.

DIFFERENTIAL

PROBE

+5V

PRECISION VOLTAGE REFERENCES

(FOR VDBS, VMAG)

PROBE

POWER SUPPLY

GND

NETWORK

ANALYZER

POWER SUPPLY

SIGNAL

INPUT

Figure 71. Typical Connections

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