Datasheet

AD8264
Rev. A | Page 34 of 40
EVALUATION BOARD
Analog Devices, Inc. provides evaluation boards to customers as
a support service so that the circuit designer can become
familiar with the device in the most efficient way possible. The
AD8264 evaluation board provides a fast, easy, and convenient
means to assess the performance of the AD8264 before going
through the hassle and expense of design and layout of a custom
board. The board is shipped fully assembled and tested, and it
provides basic functionality as shipped. Standard connectors
enable the user to attach standard lab test equipment without
having to wait for the rest of the design to be completed. Figure 117
shows a digital image of the top view, and Figure 118 shows the
schematic diagram of the AD8264 evaluation board.
The printed circuit board (PCB) artwork for all conductor and silk-
screen layers is shown in Figure 119 to Figure 124. A description of
a typical test setup can be found in the Applications Information
section. The PCB artwork can be used as a guide for circuit
layout and placement of parts. This is particularly useful for
multiple function circuits with many pins, requiring multiple
passive components.
CONNECTING AND USING THE AD8264-EVALZ
The AD8264 operates with bipolar power supplies from ±2.5 V dc
to ±5 V dc. Make sure the current capacity is ≥400 mA. Connect a
ground reference from the supplies to any of the black test loops,
the positive supply to the red test loop (+V), and the negative
supply to the blue test loop (−V).
Notice that the board is shipped with jumpers installed on
the 2-pin headers marked GN1_2, GN3_4, OFS_12, OFS_34,
GNLO, and VOCM. If these jumpers are missing, the offset and
common-mode functions float high, substantially increasing
the quiescent current of the board.
Apply input signals to any of the preamps at the SMA connectors,
IN1 through IN4. These connectors are terminated with 50 Ω to
accommodate typical signal generator analyzer voltage source
impedances. The gain of the AD8264 preamps is fixed at 6 dB (2×)
and can be monitored at the SMA connectors, OP1_2 and OP3_4,
if desired. Note that there are output selector switches for each pair
of preamps and 453 Ω resistors in series with the preamp outputs.
07736-087
Figure 117. Digital Image of the AD8264-EVALZ (Top View)