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DAC5675 View Datasheet(PDF) - Texas Instruments

Part NameDescriptionManufacturer
DAC5675 14-BIT, 400-MSPS DIGITAL-TO-ANALOG CONVERTER TI
Texas Instruments TI
DAC5675 Datasheet PDF : 31 Pages
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DAC5675
SLAS352C − DECEMBER 2001 − REVISED AUGUST 2004
analog current outputs (continued)
The DAC5675 can easily be configured to drive a doubly terminated 50-cable using a properly selected
transformer. Figure 11 and Figure 12 show the 1:1 and 4:1 impedance ratio configuration. These configurations
provide maximum rejection of common-mode noise sources and even order distortion components, thereby
doubling the DAC’s power to the output. The center tap on the primary side of the transformer is terminated to
AVDD, enabling a dc current flow for both IOUT1 and IOUT2. Note that the ac performance of the DAC5675
is optimum and specified using a 1:1 differential transformer coupled output.
3.3 V
(AVDD)
DAC5675
50
IOUT1
1:1
100
IOUT2
RLOAD
50
50
3.3 V
(AVDD)
3.3 V
(AVDD)
Figure 11. Driving a Doubly Terminated 50-Cable Using a 1:1 Impedance Ratio Transformer
3.3 V
(AVDD)
DAC5675
100
IOUT1
4:1
RLOAD
50
IOUT2
15
100
3.3 V
(AVDD)
3.3 V
(AVDD)
Figure 12. Driving a Doubly Terminated 50-Cable Using a 4:1 Impedance Ratio Transformer
12
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