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DAC3484 数据表(PDF) 58 Page - Texas Instruments

部件名 DAC3484
功能描述  Quad-Channel, 16-Bit, 1.25 GSPS Digital-to-Analog Converter
Download  107 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

DAC3484 数据表(HTML) 58 Page - Texas Instruments

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IOUTP
4:1
IOUTN
AGND
100 Ω
R
50 Ω
LOAD
100 Ω
S0518-01
IOUTP
1:1
IOUTN
AGND
50 Ω
R
50 Ω
LOAD
50 Ω
100 Ω
S0517-01
DAC3484
SLAS749E – MARCH 2011 – REVISED NOVEMBER 2015
www.ti.com
Figure 85. Driving a Doubly terminated 50-
Ω Cable Using a 1:1 Impedance Ratio Transformer
Figure 86. Driving a Doubly Terminated 50-
Ω Cable Using a 4:1 Impedance Ratio Transformer
7.4 Device Functional Modes
7.4.1 Multi-Device Synchronization
In various applications, such as multi antenna systems where the various transmit channels information is
correlated, it is required that multiple DAC devices are completely synchronized such that their outputs are phase
aligned. The DAC3484 architecture supports this mode of operation.
7.4.1.1 Multi-Device Synchronization: PLL Bypassed with Dual Sync Sources Mode
For single or multi-device synchronization it is important that delay differences in the data are absorbed by the
device so that latency through the device remains the same. Furthermore, to guarantee that the outputs from
each DAC are phase aligned it is necessary that data is read from the FIFO of each device simultaneously. In
the DAC3484 this is accomplished by operating the multiple devices in Dual Sync Sources mode. In this mode
the additional OSTR signal is required by each DAC3484 to be synchronized.
Data into the device is input as LVDS signals from one or multiple baseband ASICs or FPGAs. Data into the
multiple DAC devices can experience different delays due to variations in the digital source output paths or board
level wiring. These different delays can be effectively absorbed by the DAC3484 FIFO so that all outputs are
phase aligned correctly.
58
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Product Folder Links: DAC3484


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