AD8432ACPZ-R7 datasheet(25/28 Pages) AD

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AD8432

Rev. 0 | Page 25 of 28

EVALUATION BOARD

Figure 68 shows the AD8432 evaluation board, and the schematic

diagram is shown in Figure 69. Using the board is a convenient

and fast way to verify system design and assess the performance of

the AD8432 under the user-specific operating conditions. The

board provides access to all LNA inputs, outputs, and gain setting

pins. The board is shipped in a typical G = 12.04 dB configuration

but is designed to allow customization of the setup as required.

The AD8432-EVALZ requires a single 5 V power supply. An

on-board switch (S1) allows VPS to drive the enable (ENB) input.

GAIN SETTING

Headers (W5 to W12) are provided across the gain setting pins

and can be shorted using jumpers to allow gain setting quickly

and easily. Alternately, it is recommended to short the gain setting

pins using surface-mount (0402), 0 Ω resistors (R1 to R4, R9 to

R12) that eliminate the small parasitic capacitances from longer

trace lengths to the headers. As shipped, the evaluation board is

configured for G = 12.04 dB with these 0 Ω resistors.

Table 8 outlines which resistors or headers need to be installed or

shorted for each gain configuration.

Table 8. Gain Setting Using Resistors or Headers

Gain (V/V)

LNA1

LNA2

R10

W10

R11

W11

R12

W12

1 X = shorting the indicated header or resistor.

Figure 68. Evaluation Board

AD8432ACPZ-R7 数据表(PDF) 25 Page - Analog Devices