Evaluation Board User Guide UG-428
Rev. 0 | Page 3 of 8
EVALUATION BOARD HARDWARE
The E VA L-ADG884EBZ evaluation board has been designed
for testing the functionality of the device. The board comes with
many options for adding loads to each of the channels and offers
the option of probing each channel through a test point.
The E VA L-ADG884EBZ evaluation board allows designers
to evaluate the high performance dual, SPDT switches with a
minimum of effort. There is a test point on each audio jack, as
well as two logic control inputs, to check the voltage level at
each pin.
OPERATING THE EVAL-ADG884EBZ EVALUATION
BOARD
Power Supplies
The evaluation board has one analog power supply input, V
DD
.
V
DD
can equal 1.8 V to 5.5 V and is decoupled to ground using a
10 µF tantalum capacitor and a 0.1 µF ceramic capacitor at the
input of the evaluation board. The V
DD
supply can be connected
to the board using the power block pin, VDD, and a ground
connection is made using the power block pin, GND.
Source and Drain Pins
There are six audio jacks available on the E VA L-ADG884EBZ
to test the capabilities of the ADG884 chip. The ADG884 chip is
bidirectional; therefore, each jack can be used as an input or an
output. The connection between each audio jack and the
associated switch pin is given in Table 1.
Signals can be applied to the source and drain pins of the
ADG884 through the audio jack connectors. The source and
drain pins offer the user the option of a test point to allow for
easy probing of the switch channels.
IN Pins
Two link options are available when using the E VA L-ADG884EBZ
evaluation board. K5 and K9 offer the user the ability to tie the
control lines, IN1 and IN2, respectively, high or low. When the
jumper is removed from the link, the control line is set logic
high, and when the jumper is inserted, the control line is set
logic low. The control lines are used to set the configuration of
the switch. Table 2 shows the association between the state of
the link headers and the connection between the audio jacks.
TESTING THE PARAMETERS OF THE ADG884
The EVA L-ADG884EBZ can be used to test the electrical
parameters of the ADG884. The data sheet for the ADG884
comes with a complete set of test circuits for testing the various
switch specifications.
Table 1. Audio Jack Functions
Jack Number Function
J10 S1A
J11 D1
J12 D2
J15 S1B
J16 S2A
J17 S2B
Table 2. Link Options
Link No. Link State ADG884 Switch States Board Connections
K5 Inserted S1A (off) S1B (on) J15 to J11
Removed S1A (on) S1B (off) J10 to J11
K9 Inserted S2A (off) S2B (on) J17 to J12
Removed S2A (on) S2B (off ) J16 to J12
