Datasheet

2.1 System Block Diagram
DAC 5682
InDual
DAC 5681
mode
OPA 695
THS3095
USB PWR
Ext
CLK
Amp
Out 2
Amp
Out 1
DAC
Input
Xformer
Passive
Out 1
DCregulation
TPS76XXX
TPS5430
UCC284
CDCM 7005
VCXO
REF
Xformer
Passive
Out 2
3 Key Texas Instruments Components
3.1 CDCM7005
3.2 DAC5682Z
3.3 TPS76xxx, TPS5430, UCC284-5
Key Texas Instruments Components www.ti.com
Figure 2 shows the functions on the TSW3070EVM board. The Texas Instruments ICs are listed on the
board for reference.
Figure 2. Block Diagram
The CDCM7005 clock distribution integrated circuit (IC) is used to generate and synchronize the clock
outputs to the system. The device has five outputs which can be either LVPECL or LVCMOS and can be
divided down by 1, 2, 3, 4, 6, 8, and 16. The divide by 16 can be replaced with a divide by 4 or 8 with a 90
degree phase shift, if desired. This device is used to lock the onboard 800-MHz VCXO and 10-MHz
reference. For further information about the CDCM7005 device, see the SCAS793 data sheet.
The DAC5682Z is a 16-bit interpolating dual digital-to-analog converter (DAC) with a high-speed LVDS
data interface. The device incorporates a digital complex coarse mixer, independent differential offset
control, and I/Q amplitude control. The device can be used with excellent results in baseband mode, low
IF mode, and high IF mode. The digital circuits can be manipulated such that it has the functionality of a
DAC5681. For further information about the DAC5682Z device, see the SLLS853 data sheet.
The TPS76xxx devices provide 1.8-V, 3.3-V, and 5-V linear regulation for the DAC5682Z, CDCM7005,
and V+ amplifier supplies. The TPS5430 generate –5.5 V from 6-V input followed by the UCC284-5 which
provides linear -5-V regulation for the V– amplifier supply. More information about the TPS5430 and
UCC284-5 devices can be found in SLVS632 and SLUS234 data sheets, respectively.
TSW3070EVM: Amplifier Interface to Current Sink DAC - Arbitrary Waveform Generator Demonstration4 SLWU055 – May 2008
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