參數(shù)資料
型號(hào)： 5962-0720601VXC
元件分類： ADC
英文描述： 3-CH 14-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, CQFP52
封裝： CERAMIC, QFP-52
文件頁(yè)數(shù)： 13/21頁(yè)
文件大?。?/td> 433K
代理商： 5962-0720601VXC
LAYOUT INFORMATION
SLWS194 – MAY 2008 ....................................................................................................................................................................................................... www.ti.com
with different grounding schemes should know that AGND pins are 4, 7, 10, 13, 15, 17, 19, 21, 23, 25, 27, and
29, while DRGND pins are 2, 34, and 42. We recommend that both grounds are tied together externally, using a
common ground plane. That is the case on the production test boards and modules provided to customer for
evaluation. To obtain the best performance, user should lay out the board to assure that the digital return
currents do not flow under the analog portion of the board. This can be achieved without splitting the board and
with careful component placement and increasing the number of vias and ground planes.
Finally, notice that the metallic heat sink under the package is also connected to analog ground.
The evaluation board represents a good guideline of how to lay out the board to obtain the maximum
performance out of the ADS5424. General design rules for use of multilayer boards, single ground plane for both,
analog and digital ADC ground connections, and local decoupling ceramic chip capacitors should be applied. The
input traces should be isolated from any external source of interference or noise, including the digital outputs as
well as the clock traces. Clock also should be isolated from other signals, especially on applications where low
jitter is required, as high IF sampling.
Besides performance oriented rules, special care has to be taken when considering the heat dissipation out of
the device. The thermal package information describes the TJA values obtained on the different configurations.
20
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): ADS5424-SP
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