Evaluation Board User Guide UG-401
Rev. 0 | Page 3 of 8
HARDWARE DESCRIPTION
ADG854 EVALUATION BOARD
AUDIO
DEVICE 1
AUDIO
DEVICE 2
AUDIO
DEVICE 3
10650-002
ADG854
TO AUDIO
DEVICE 1
TO AUDIO
DEVICE 3
TO AUDIO
DEVICE 2
CONTROL SECTION:
SWITCHES CAN BE CONTROLLED
MANUALLY BY CHANGING JUMPER
POSITIONS OR FROM AN EXTERNAL
SIGNAL SOURCE TO THE
SMB CONNECTORS.
L3 L2
SMB CONNECTORS
Figure 2. Evaluation Board Block Diagram
The ADG854 evaluation kit contains a fully fitted PCB. The
ADG854 data sheet and this user guide are available on the
ADG854 product page.
The evaluation board allows the user to switch between two
audio sources or to switch an audio source between two
speakers by using the on-board jumpers or by applying the
correct control signals to the appropriate connectors. The
following sections describe in detail the function of the
connectors and links.
POWER SUPPLY
The ADG854 can operate from a 1.8 V to 5.5 V single supply
and is fully specified for 5.5 V and 3.3 V supply operation.
SWITCH CONTROL CONNECTORS
The ADG854 device offers a standard CMOS/LVTTL parallel
interface consisting of two IN inputs. The IN1 and IN2 input
pins control the switch state and operation mode of the
ADG854. The evaluation board allows the user to control the
signals required to set the logic levels applied to these pins by
using the L2 and L3 links as described in Table 1 or by applying
external signals to the SMB connectors, IN1 and IN2, as
described in Table 2.
To control the ADG854 using the SMB connectors, L2 and L3
must be set to Position B. Note that there are 51 Ω termination
resistors to GND at the IN1 and IN2 SMB connectors.
Table 1. Control via Link L2/Link L3
L2 and L3 Position
Switch Status
Audio Device 1 Status Audio Device 2 Status
B Active Inactive
A Inactive Active
Table 2. Control via SMB Connector Settings
L2 and L3 Position Switch Status—Audio Device Status
B SMB High = Audio Device 2 active
SMB Low = Audio Device 1 active
