ADA4937-1YCP-EBZ【PDF 4/8 页】BOARD EVAL FOR ADA4937-1YCP

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UG-132

EVALUATION BOARD HARDWARE

POWER SUPPLIES

Power is applied to the board through test pins +V S and ?V S

(see Figure 3). The board accommodates single or dual supplies.

For single-supply operation, connect the negative supply to the

ground plane.

It is very important that the power supply pins of the device

under test (DUT) have broadband decoupling circuitry. The

board layout facilitates this with footprints for a 0508 ceramic

capacitor C1 and C2) on each supply. Bulk decoupling is

provided by C3 and C4; 10 μF tantalum capacitors are

recommended.

FEEDBACK NETWORKS AND INPUT/OUTPUT

TERMINATIONS

R1/RG and R2/RF comprise the upper resistive feedback loop

(see Figure 3), and R3/RG and R4/RF compose the lower

feedback loop. To minimize summing node capacitances, the

ground plane under and around Pin 1 and Pin 8 of the DUT

(see Figure 3) and the copper that connects to them have been

removed.

R5 and R6 are included as input termination resistors for applica-

tions that have single-ended inputs.

Evaluation Board User Guide

V OCM INPUT

An external voltage can be applied to V OCM via J6 (referenced to

the ground plane of the board). In ADC driving applications, it

is convenient to apply the ADC dc reference voltage output

directly to J6. The R11 component position can be used for

both resistors and capacitors. A 0.1 μF capacitor is used in

normal applications to provide bypassing for the dc voltage

applied to the V OCM pin.

It is also possible to drive the V OCM input from an external ac

source. In this case, omit R11 or reduce it to a value that allows

the desired signal to be passed.

COMMON-MODE VOLTAGE

The internal common-mode feedback loop used in the differen-

tial drivers forces the output common-mode voltage to be equal

to the voltage applied to the V OCM input, thereby providing

excellent output balance.

SMA INPUT/OUTPUT CONNECTORS

The inputs and outputs have edge-mounted SMA connectors

for convenient connection to coaxial cables. The recommended

connector type is Johnson Components?, Part Number 142-

0701-801 or equivalent.

Rev. 0 | Page 4 of 8

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