Initial Power Up and Test
23
SLWU055A – May 2008 – Revised May 2016
Copyright © 2008–2016, Texas Instruments Incorporated
TSW3070EVM: Amplifier Interface to Current Sink DAC - Arbitrary Waveform
Generator Demonstration
8
Initial Power Up and Test
This section outlines the basic power up and test procedure to ensure that the EVM is in an operational
state.
8.1
Initial Inspection
Inspect the board to determine which VCXO is on the board. This is useful information when programming
the CDCM7005 to lock the DAC clock to the reference. Typically, the board is populated with an 800-MHz
VCXO.
8.2
Engage Power Supplies
1. Connect the EVM supplied 18-AWG wires to the DC plug cable (Tensility 10-01776) to a qualified lab
bench power supply. The 18-AWG red wire is the 6-V wire while the 18-AWG black wire is the ground
wire.
2. Connect the 6-V power supply to J12, the Power In jack of the TSW3070 EVM.
3. Connect the PC USB port to J4 USB port of the TSW3070 EVM.
8.3
Verify Status of the Board
The DAC software will detect if the USB port is active and if it is capable of reading the serial number from
the EVM. This determines if the communication between the board and the PC is correct. The HOME
menu of the DAC GUI software indicates this status. The VCXO and Reference LEDs (D1, D2) must be lit
as well as the power LED (D18).
8.4
Program the CDCM7005
On the DAC5682z EVM GUI, click on
Register Config
which is located on the left side of the GUI.
Program the registers as necessary manually or load a saved configuration file. An example file for
loading the CDCM7005 called
CDCM7005_4X_Interp.reg7005
can be found on the provided CD. To load
this file, click on the
Load Regs
button on the lower center of the GUI. Navigate to the correct location,
select this file, then click on
OK
. The default mode of GUI has the
CDCM7005 Operation
set to
Buffer
Mode
. Click on this button and change the setting to
PLL Mode
. Next, change the
VCXO Freq (MHz)
default value of
983.04
to
800
by either clicking on the down arrow of this button or entering
800
manually.
Hit enter and the new settings will be sent to the CDCM7005. Note that the CDCM7005 LOCK LED (D3) is
now lit as it achieves lock between the VCXO and 10-MHz reference. This LED does not illuminate when
using external VCXO.
Figure 15. CDCM7005, 800M VCXO, 10M Ref, Locked Condition LEDs
