Datasheet

A
Ref -13.2 dBm Att 5 dB
*
*
*
*1 RM
CLRWR
RBW 30 kHz
VBW 300 kHz
SWT 2 s
NOR
*
Center 2.53072 GHz Span 25.5 MHz2.55 MHz/
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
Tx Channel W-CDMA 3GPP FWD
Bandwidth 3.84 MHz
Power -8.95 dBm
Adjacent Channel
Bandwidth 3.84 MHz
Lower -75.79 dB
Spacing
5 MHz
Upper -75.42 dB
Alternate Channel
Bandwidth 3.84 MHz
Lower -78.44 dB
Spacing 10 MHz
Upper -77.21 dB
6.5 DAC5681/81z/82z Test Procedure
www.ti.com DAC5681/81z/82z Initial Power Up and Test
Figure 15. DAC5682z EVM output at RF LO + low IF of 30.72M (6 dB lower than DAC output)
The steps described in this section show how to connect and configure the DAC5681/81z/82z EVM for
evaluation under the default settings.
1. Connect the DAC5681/81z/82z EVM SEMTEK connector to a digital test pattern generator that
supports this interface such as Texas Instruments TSW3100.
2. Connect the 1.8-V (J14/J15) and 3.3-V (J17/J18) power supplies. If using the modulator the 5-V
(J19/J20) supply also needs to be connected. Ensure that each supply is not drawing more than 1-A of
current.
3. Provide a single-ended, 1-Vrms, 0-V, offset sine-wave signal to the EVM EXT_VCXO_P (J6) SMA
connector. LED D1 should illuminate indicating that a signal has been detected. If not, verify that the
correct signal is being provided.
4. If testing at RF (DAC5682z EVM option) provide a 6-dBm LO signal to the RF_LO_IN (J23) SMA
connector.
5. Connect one end of the supplied USB cable to an available USB port on the host PC. Connect the
other end of the cable to J13 on the EVM.
6. Open the DAC5682z EVM software. The DAC software detects if the USB port is active and if it is
capable of reading the EVM serial number. The EVM Home menu (Figure 9 and Table 6 ) of the
DAC8652z GUI software provides this status information.
7. Program the CDCM7005 and DAC registers as necessary. An example configuration file is included
under the installation folder: C:\Program Files\Texas Instruments\DAC5682z\DAC5682z Configuration
Files\
8. Program and run the pattern generator. If using the TSW3100, see the user's guide for more
information on how to set up a digital pattern.
9. Analyze the DAC or RF output using an spectrum analyzer.
SLAU236A – November 2007 – Revised October 2008 DAC5681/81z/82z EVM 23
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