Datasheet

6.4 Typical Performance Measurements
Ref -12 dBm Att 10 dB
*
*
*
A
NOR
RBW 30 kHz
VBW 300 kHz
SWT 2 s
*
Center 30.72 MHz Span 25.5 MHz2.55 MHz/
*1 RM
CLRWR
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
Tx Channel W-CDMA 3GPP FWD
Bandwidth 3.84 MHz
Power -8.02 dBm
Adjacent Channel
Bandwidth 3.84 MHz
Lower -81.73 dB
Spacing 5 MHz
Upper -81.65 dB
Alternate Channel
Bandwidth 3.84 MHz
Lower -82.95 dB
Spacing 10 MHz
Upper -82.74 dB
DAC5681/81z/82z Initial Power Up and Test www.ti.com
The DAC5681, DAC5681z and DAC5682z measurements at the transformer outputs J1 and J3 will have
better performance than the RF output at low output frequencies. The RF output is typically limited by the
performance of the RF parts. In this case the DAC output at 0 IF or low IF is several dB better than the
noise floor of the modulator output at J16.
Figure 14. DAC5681/81z/82z EVM Transformer Output With a Low IF at 30.72 MHz
22 DAC5681/81z/82z EVM SLAU236A – November 2007 – Revised October 2008
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