datasheetbank_Logo     Технический паспорт Поисковая и бесплатно техническое описание Скачать

ADC08200 Просмотр технического описания (PDF) - Texas Instruments

Номер в каталогеКомпоненты Описаниепроизводитель
ADC08200 8-Bit, 20 Msps to 200 Msps, Low Power A/D Converter with Internal Sample and-Hold TI
Texas Instruments TI
ADC08200 Datasheet PDF : 27 Pages
First Prev 11 12 13 14 15 16 17 18 19 20 Next Last
ADC08200
www.ti.com
SNAS136M – APRIL 2001 – REVISED MARCH 2013
This termination should be located as close as possible to, but within one centimeter of, the ADC08200 clock pin.
Further, this termination should be close to but beyond the ADC08200 clock pin as seen from the clock source.
Typical tprop is about 150 ps/inch on FR-4 board material. For FR-4 board material, the value of C becomes
where
• L is the length of the clock line in inches
(8)
This termination should be located as close as possible to, but within one centimeter of, the ADC08200 clock pin.
LAYOUT AND GROUNDING
Proper grounding and proper routing of all signals are essential to ensure accurate conversion. A combined
analog and digital ground plane should be used.
Coupling between the typically noisy digital circuitry and the sensitive analog circuitry can lead to poor
performance that may seem impossible to isolate and remedy. The solution is to keep all lines separated from
each other by at least six times the height above the reference plane, and to keep the analog circuitry well
separated from the digital circuitry.
The DR GND connection to the ground plane should not use the same feedthrough used by other ground
connections.
High power digital components should not be located on or near a straight line between the ADC or any linear
component and the power supply area as the resulting common return current path could cause fluctuation in the
analog input “ground” return of the ADC.
Generally, analog and digital lines should cross each other at 90° to avoid getting digital noise into the analog
path. In high frequency systems, however, avoid crossing analog and digital lines altogether. Clock lines should
be isolated from ALL other lines, analog AND digital. Even the generally accepted 90° crossing should be
avoided as even a little coupling can cause problems at high frequencies. Best performance at high frequencies
is obtained with a straight signal path.
The analog input should be isolated from noisy signal traces to avoid coupling of spurious signals into the input.
Any external component (e.g., a filter capacitor) connected between the converter's input and ground should be
connected to a very clean point in the ground plane.
Locate driving amplifier
near ADC input pin
RF
RIN
R
C
LMH6702
Single
Ground
Plane
ADC Clock
Source
ADC
08200
Locate Clock Source
near ADC clock pin
Locate power supply on
the digital side of the
ADC
Figure 34. Layout Example
Copyright © 2001–2013, Texas Instruments Incorporated
Product Folder Links: ADC08200
Submit Documentation Feedback
19
Direct download click here

 

Share Link : 

All Rights Reserved © datasheetbank.com 2014 - 2020 [ политика конфиденциальности ] [ Запрос Даташит ]