AD604ARSZ-R7 datasheet(24/32 Pages) AD

24 / 32 page

AD604

Rev. D | Page 24 of 32

EVALUATION BOARD

Figure 55 is a photograph of the AD604 evaluation board assembly.

Multiple input connections, test points, jumper selectable options,

and on-board trims offer convenience when configuring the

AD604 in various operating modes.

The evaluation board requires only a dual 5 V supply capable of

200 mA or higher to operate both channels. Prior to shipment,

the evaluation board is fully tested. Users need only attach

power supply leads and the appropriate test equipment to

the board.

Because of this flexibility, not all component positions on the

board are populated when the board is shipped. Installing or

changing additional parts is optional.

The AD604-EVAL is fabricated on a 4-layer board with inner

power and ground layers. The AD604 is a stable, trouble-free

device; however, as with all high frequency integrated circuits,

power and ground planes help to ensure consistency in

performance.

Figure 55. AD604 Evaluation Board Assembly

USING THE PREAMPLIFIER

To use the preamplifiers, simply connect a signal source to CH1

PREAMP IN and/or CH2 PREAMP IN via the SMA connectors.

Referring to the schematic in Figure 61, the input lines are

terminated with 50 Ω resistors at locations R7 and R8.

To enable the preamplifiers, insert jumpers in the JP8 and JP9

rightmost positions; this connects COM1 and COM2 to ground.

Power down the preamplifiers by inserting jumpers in the JP8

and JP9 leftmost positions.

Figure 56. AD604 Evaluation Board—Component Side Silk Screen

DSX INPUT CONNECTIONS

The DSX inputs can be connected in single-ended or differential

configurations. SMA connectors are provided for each of the

inputs and are labeled CH1, CH2, VGA IN (+), and VGA IN (−).

JP6 and JP15 select between the preamplifier outputs and the

DSX inputs.

For direct drive of the Channel 1 VGA, insert a jumper in the

top position of JP6. For direct drive of the Channel 2 VGA,

insert a jumper in JP14 and verify that there are no jumpers in

JP12 and JP13. Refer to the schematic shown in Figure 61 for

circuit details.

Differential DSX Inputs

Differential inputs are possible using both polarities of the

VGA SMA connectors and appropriate jumpers. Inserting a

jumper in the lower position of JP5 selects the negative input

of Channel 1. A jumper in the top position of JP6 selects the

positive input of Channel 1. A jumper in the JP16 rightmost

position selects the negative input of Channel 2, and a jumper

in JP14 selects the positive input. Again, verify that there are no

jumpers in JP15 or JP13.

Because the VGA section of the AD604 uses a single 5 V supply,

the DSX inputs are ac-coupled. Decoupling capacitors are provided

on the evaluation board.

The DSX input impedance is approximately 200 Ω. Optional

66.5 Ω resistors can be installed across the inputs at positions

R5, R6, R9, and R10 to establish a 50 Ω terminating load.

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