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ADSST-SALEM-3T
Pin No. | Mnemonic | Function |
18 | SE | SPORT Enable. Asynchronous input enable pin for the SPORT. When SE is set low by the DSP, |
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| the output pins of the SPORT are |
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| disabled internally in order to decrease power dissipation. When SE is brought high, the |
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| control and data registers of the SPORT are at their original values (before SE was brought |
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| low); however, the timing counters and other internal registers are at their reset values. |
19 | AGND1 | Analog Ground Connection. |
20 | AVDD1 | Analog Power Supply Connection. |
21 | VINP6 | Analog Input to the Positive Terminal of Input Channel 6. |
22 | VINN6 | Analog Input to the Negative Terminal of Input Channel 6. |
23 | VINP5 | Analog Input to the Positive Terminal of Input Channel 5. |
24 | VINN5 | Analog Input to the Negative Terminal of Input Channel 5. |
25 | VINP4 | Analog Input to the Positive Terminal of Input Channel 4. |
26 | VINN4 | Analog Input to the Negative Terminal of Input Channel 4. |
27 | VINP3 | Analog Input to the Positive Terminal of Input Channel 3. |
28 | VINN3 | Analog Input to the Negative Terminal of Input Channel 3. |
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GROUNDING AND LAYOUT
Since the analog inputs to the
The printed circuit board that houses the
ANALOG GROUND |
DIGITAL GROUND |
Figure 8. Ground Plane Layout
A minimum etch technique is generally best for ground planes as it gives the best shielding. Digital and analog ground planes should be joined in only one place. If this connection is close to the device, it is recommended to use a ferrite bead inductor as shown in Figure 9.
Avoid running digital lines under the device for they will couple noise onto the die. The analog ground plane should be enabled to run under the
Good decoupling is important when using high speed devices. All analog and digital supplies should be decoupled to AGND and DGND, respectively, with 0.1 µF ceramic capacitors in parallel with 10 µF tantalum capacitors. To achieve the best from these decoupling capacitors, they should be placed as close as possible to the device, ideally right up against it. In systems where a common supply voltage is used to drive both the AVDD and DVDD of the
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