UG-655
EVAL-ADA4350RUZ-P User Guide
Rev. 0 | Page 4 of 8
EVALUATION BOARD CONTROL
This user guide focuses on setting up the evaluation board. For
logic tables of the different control modes and for an in depth
analysis of the circuit, refer to the
ADA4350
data sheet.
Manual Mode
The evaluation board is configured for manual gain selection
using the DIP switches. The DIP switch on position represents
Logic 0. To operate manually, set the enable switch to Logic 1
(off position), and set the MODE switch to Logic 1 (off
position).
To select one gain, set all gain select switches, P0 to P4, to
Logic 0 (on position) and select a gain by setting the
corresponding gain select switch to Logic 1 (off position).
Note that only five feedback paths (FB0 to FB4) can be accessed
in the manual mode and that selecting more than one gain
connects all the selected feedback resistors in parallel.
SPI Control (Parallel Mode)
The parallel mode works very similar to the manual mode
except that five digital control lines (P0 to P4) are used instead
of the manual switches. Set the enable switch to Logic 1 (off
position), and set the MODE switch to Logic 1 (off position).
Set the DIP switches (P0 to P4) to Logic 1 (off position), and
connect the logic output of an external microcontroller or
FPGA to the plated holes next to the P0 to P4 switches. A
Logic 1 on each digital line selects the corresponding gain.
Applying a Logic 1 to more than one line at a time connects
all the selected gains in parallel.
SPI Control (Serial Mode)
Set the MODE switch and LATCH switch to Logic 0 (on
position), and the ENABLE switch to Logic 1 (off position). Set
all other gain select switches (P1 to P4) to Logic 1 (off position),
and perform the following steps:
1.
Plug the Analog Devices, Inc., SDP-S controller board onto
the 120-pin connector on the
ADA4350
evaluation board.
The
SDP-S
control board can be purchased from Analog
Devices.
The user can also use an individual SPI interface through
the 5-pin SPI connector on the evaluation board.
2.
Download the LabVIEW® control panel from
http://www.analog.com/ada4350-demoinstaller
. Unzip the
file, click
setup.exe
, and follow the installation prompts. If
the installation is successful, the
ADA4350 Evaluation
icon appears under
Start
>
Programs
>
Analog Devices
(see Figure 5).
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98-
00
5
Figure 5. Location of the LabVIEW Control Panel Program
3.
Open the LabVIEW control panel (see Figure 6). The
control panel allows the user to open and close individual
switches in the switch matrix of the
ADA4350
. For
example, to select the FB0 feedback path, click the S0 and
S6 switches, then click the
Write New Configuration
button.
1
1
99
8
-00
6
Figure 6. Labview Control Panel
Switches
The gain select switches (S0 to S5) have around 350 Ω series
internal resistance that appears as a resistance in series with
the TIA output, while S6 to S11 has around 150 Ω switch
resistances.
