参数资料
型号: AD7682BCPZ
厂商: Analog Devices Inc
文件页数: 25/32页
文件大小: 0K
描述: IC ADC 16BIT 4CH 250KSPS 20LFCSP
产品培训模块: Power Line Monitoring
产品变化通告: Startup Circuitry Design Improvement Change 15/April/2009
标准包装: 1
系列: PulSAR®
位数: 16
采样率(每秒): 250k
数据接口: DSP,MICROWIRE?,QSPI?,串行,SPI?
转换器数目: 1
功率耗散(最大): 21mW
电压电源: 模拟和数字
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 20-VFQFN 裸露焊盘,CSP
供应商设备封装: 20-LFCSP-VQ
包装: 托盘
输入数目和类型: 8 个单端,单极;4 个差分,双极;4 个伪差分,双极
产品目录页面: 778 (CN2011-ZH PDF)
Data Sheet
AD7682/AD7689
Rev. D | Page 31 of 32
APPLICATION HINTS
LAYOUT
The printed circuit board (PCB) that houses the AD7682/AD7689
should be designed so that the analog and digital sections are
separated and confined to certain areas of the board. The pinout of
the AD7682/AD7689, with all its analog signals on the left side
and all its digital signals on the right side, eases this task.
Avoid running digital lines under the device because these
couple noise onto the die unless a ground plane under the
AD7682/AD7689 is used as a shield. Fast switching signals,
such as CNV or clocks, should not run near analog signal
paths. Avoid crossover of digital and analog signals.
At least one ground plane should be used. It can be common or
split between the digital and analog sections. In the latter case,
the planes should be joined underneath the AD7682/AD7689.
The AD7682/AD7689voltage reference input REF has a
dynamic input impedance and should be decoupled with
minimal parasitic inductances. This is done by placing the
reference decoupling ceramic capacitor close to, ideally right up
against, the REF and GND pins and connecting them with wide,
low impedance traces.
Finally, the power supplies VDD and VIO of the AD7682/
AD7689 should be decoupled with ceramic capacitors, typically
100 nF, placed close to the AD7682/AD7689, and connected
using short, wide traces to provide low impedance paths and to
reduce the effect of glitches on the power supply lines.
EVALUATING AD7682/AD7689 PERFORMANCE
Other recommended layouts for the AD7682/AD7689 are
outlined in the documentation of the evaluation board for the
The evaluation board package includes a fully assembled and
tested evaluation board, documentation, and software for
controlling the board from a PC via the converter and evaluation
development data capture board, EVAL-CED1Z.
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