參數(shù)資料
型號(hào): AD7680BRM
廠商: Analog Devices Inc
文件頁數(shù): 11/24頁
文件大小: 0K
描述: IC ADC 16BIT LP UNIPOLAR 8-MSOP
標(biāo)準(zhǔn)包裝: 50
系列: PulSAR®
位數(shù): 16
采樣率(每秒): 100k
數(shù)據(jù)接口: DSP,MICROWIRE?,QSPI?,串行,SPI?
轉(zhuǎn)換器數(shù)目: 1
功率耗散(最大): 26.4mW
電壓電源: 單電源
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 8-TSSOP,8-MSOP(0.118",3.00mm 寬)
供應(yīng)商設(shè)備封裝: 8-MSOP
包裝: 管件
輸入數(shù)目和類型: 1 個(gè)單端,單極
AD7680
Rev. A | Page 19 of 24
APPLICATION HINTS
GROUNDING AND LAYOUT
The printed circuit board that houses the AD7680 should be
designed such that the analog and digital sections are separated
and confined to certain areas of the board. This facilitates the
use of ground planes that can be separated easily. A minimum
etch technique is generally best for ground planes, because it
gives the best shielding. Digital and analog ground planes
should be joined at only one place. If the AD7680 is in a system
where multiple devices require an AGND to DGND
connection, the connection should still be made at one point
only, a star ground point that should be established as close as
possible to the AD7680.
Avoid running digital lines under the device because these
couple noise onto the die. The analog ground plane should be
allowed to run under the AD7680 to avoid noise coupling. The
power supply lines to the AD7680 should use as large a trace as
possible to provide low impedance paths and reduce the effects
of glitches on the power supply line. Fast switching signals, such
as clocks, should be shielded with digital ground to avoid
radiating noise to other sections of the board, and clock signals
should never be run near the analog inputs. Avoid crossover of
digital and analog signals. Traces on opposite sides of the board
should run at right angles to each other, which reduces the
effects of feedthrough on the board. A microstrip technique is
by far the best but is not always possible with a double-sided
board. In this technique, the component side of the board is
dedicated to ground planes while the signals are placed on the
solder side.
Good decoupling is also very important. All analog supplies
should be decoupled with 10 μF tantalum in parallel with
0.1 μF capacitors to AGND, as discussed in the Typical
Connection Diagram section. To achieve the best performance
from these decoupling components, the user should attempt to
keep the distance between the decoupling capacitors and the
VDD and GND pins to a minimum, with short track lengths
connecting the respective pins.
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