參數(shù)資料
型號(hào): ADS8402IPFBT
英文描述: 16-BIT, 1.25 MSPS, UNIPOLAR DIFFERENTIAL INPUT, MICRO POWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE AND REFERENCE
中文描述: 16位,1.25 MSPS的,單極差動(dòng)輸入,微功耗采樣模數(shù)位并行接口和參考轉(zhuǎn)爐
文件頁(yè)數(shù): 24/25頁(yè)
文件大?。?/td> 212K
代理商: ADS8402IPFBT
ADS8402
SLAS154B
DECEMBER 2002
REVISED MAY 2003
www.ti.com
24
The AGND and BDGND pins should be connected to a clean ground point. In all cases, this should be the analog
ground. Avoid connections which are close to the grounding point of a microcontroller or digital signal processor. If
required, run a ground trace directly from the converter to the power supply entry point. The ideal layout consists of
an analog ground plane dedicated to the converter and associated analog circuitry.
As with the AGND connections, +VA
should be connected to a 5-V power supply plane or trace that is separate from
the connection for digital logic until they are connected at the power entry point. Power to the ADS8402 should be
clean and well bypassed. A 0.1-
μ
F ceramic bypass capacitor should be placed as close to the device as possible.
See Table 2 for the placement of the capacitor. In addition, a 1-
μ
F to 10-
μ
F capacitor is recommended. In some
situations, additional bypassing may be required, such as a 100-
μ
F electrolytic capacitor or even a Pi filter made up
of inductors and capacitors
all designed to essentially low-pass filter the 5-V supply, removing the high frequency
noise.
Table 2. Power Supply Decoupling Capacitor Placement
POWER SUPPLY PLANE
SUPPLY PINS
CONVERTER ANALOG SIDE
CONVERTER DIGITAL SIDE
Pin pairs that require shortest path to decoupling capacitors
(4,5), (8,9), (10,11), (13,15),
(43,44), (45,46)
(24,25), (34, 35)
Pins that require no decoupling
12, 14
37
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