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參數(shù)資料
| 型號(hào)： | TLV320AC57PT |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 3-V VOICE-BAND AUDIO PROCESSORS VBAPE |
| 中文描述： | 3伏的語(yǔ)音頻帶音頻處理器VBAPE |
| 文件頁(yè)數(shù)： | 38/46頁(yè) |
| 文件大?。?/td> | 452K |
| 代理商： | TLV320AC57PT |
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SLAS428 AUGUST 2004
www.ti.com
38
LAYOUT
The following layout suggestions should provide optimum performance from the ’DAC26. However, many portable
applications have conflicting requirements concerning power, cost, size, and weight. In general, most portable devices
have fairly
clean
power and grounds because most of the internal components are very low power. This situation means
less bypassing for the converter power and less concern regarding grounding. Still, each situation is unique and the
following suggestions should be reviewed carefully.
For optimum performance, care must be taken with the physical layout of the ’DAC26 circuitry. Power to the ’DAC26 must
be clean and well bypassed. A 0.1-
μ
F ceramic bypass capacitor must be placed as close to the device as possible. A 1-
μ
F
to 10-
μ
F capacitor may also be needed if the impedance between the ’DAC26 supply pins and the system power supply
is high.
The ground pins must be connected to a clean ground point. In many cases, this is the
analog
ground. Avoid connections
which are too near the grounding point of a microcontroller or digital signal processor. If needed, run a ground trace directly
from the converter to the power supply entry or battery connection point. The ideal layout includes an analog ground plane
dedicated to the converter and associated analog circuitry.
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