National Semiconductor DAC5682Z, Руководство пользователя

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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
Copyright © 2016, Texas Instruments Incorporated
Block Diagrams
www.ti.com
4 SLWU055A – May 2008 – Revised May 2016
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Copyright © 2008–2016, Texas Instruments Incorporated
TSW3070EVM: Amplifier Interface to Current Sink DAC - Arbitrary Waveform
Generator Demonstration
2 Block Diagrams
2.1 System Block Diagram
Figure 1 shows the functions on the TSW3070EVM board. The Texas Instruments ICs are listed on the
board for reference.
Figure 1. Block Diagram
3 Key Texas Instruments Components
3.1 CDCM7005
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 device data sheet,
SCAS793 .
3.2 DAC5682Z
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 device datasheet,
SLLS853 .
3.3 TPS76xxx, TPS5430, UCC284-5
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 is found in the respective datasheets,
SLVS632 and SLUS234 .