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ADC083000 数据表(PDF) 2 Page - Texas Instruments

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部件名 ADC083000
功能描述  selecting amplifiers, adcs, and clocks for high-performance signal paths
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

ADC083000 数据表(HTML) 2 Page - Texas Instruments

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SIGNAL PATH
designer®
Tips, tricks, and techniques from the analog signal-path experts
No. 111
Modern communication and measurement system designs are
increasing in complexity as the latest high-performance proces-
sors and DSPs enable new signal-processing techniques. As system
requirements for speed and resolution increase, more capable Analog-to-Digital
Converters (ADCs) emerge, and these in turn require higher-performance
Analog Front Ends (AFEs). In many systems the AFE can be considered a
key limiting factor in the overall system performance. Applications such as
medical ultrasound, RADAR, Radio Frequency Identification (RFID), and
video imaging similarly demand high-performance AFEs. AFE designers
today are faced with the challenge of selecting the best amplifier to drive the
ADC, including how to maximize the dynamic range of the signal path and
how to choose the best filter for a given application. This article will address
the design of high-speed data acquisition systems, including some of the
limiting factors in the overall system performance created by the AFE and
the clock driving the ADC.
A generic AFE signal path including a source (Vs), Low-Noise Amplifier
(LNA), ADC driver, channel filter, sampling clock, and ADC stages are
shown in Figure 1.
A key measure of any data-acquisition-system performance is the Effective
Number Of Bits (ENOB) of resolution it delivers. The ENOB is maximized
by minimizing the noise and distortion added by each stage of the AFE to the
processed signal. A measure of the noise added by a particular stage is the noise
factor, F, which is the total input referred noise of the stage divided by the input
noise due to the previous stage. The often-quoted Noise Figure, NF, is 10 log F.
Selecting Amplifiers, ADCs, and Clocks
for High-Performance Signal Paths
— By Mike Ewer, Principal Applications Engineer
LNA
ADC
Driver
ADC
Channel
Filter
CLK
Clock
Driver
CLK
VS
RS
Figure 1. AFE Signal Path
Feature Article ............... 1-9
GHz Amplifiers..................10
GSPS A/D Converters......11
SignalPathDesigner.indd 1
SignalPathDesigner.indd 1
9/5/07 3:24:28 PM
9/5/07 3:24:28 PM


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