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ADC10D020CIVSX 数据表(PDF) 11 Page - Texas Instruments

部件名 ADC10D020CIVSX
功能描述  ADC10D020 Dual 10-Bit, 20 MSPS, 150 mW A/D Converter
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

ADC10D020CIVSX 数据表(HTML) 11 Page - Texas Instruments

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ADC10D020
www.ti.com
SNAS143D – SEPTEMBER 2001 – REVISED MARCH 2013
Figure 5. AC Test Circuit
Specification Definitions
APERTURE (SAMPLING) DELAY is that time required after the fall of the clock input for the sampling switch to
open. The Sample/Hold circuit effectively stops capturing the input signal and goes into the “hold” mode
tAD after the clock goes low.
APERTURE JITTER is the variation in aperture delay from sample to sample. Aperture jitter shows up as input
noise.
CLOCK DUTY CYCLE is the ratio of the time that the clock waveform is high to the total time of one clock
period.
CROSSTALK is coupling of energy from one channel into the other channel.
DIFFERENTIAL NON-LINEARITY (DNL) is the measure of the maximum deviation from the ideal step size of 1
LSB. Measured at 20 MSPS with a ramp input.
EFFECTIVE NUMBER OF BITS (ENOB, or EFFECTIVE BITS) is another method of specifying Signal-to-Noise
and Distortion Ratio, or SINAD. ENOB is defined as (SINAD
− 1.76)/6.02 and says that the converter is
equivalent to a perfect ADC of this (ENOB) number of bits.
FULL POWER BANDWIDTH (FPBW) is the frequency at which the magnitude of the reconstructed output
fundamental drops 3 dB below its 1 MHz value.
GAIN ERROR is the difference between the ideal and actual differences between the input levels at which the
first and last code transitions occur. That is, how far this difference is from Full Scale.
INTEGRAL NON LINEARITY (INL) is a measure of the maximum deviation of each individual code from a line
drawn from zero scale (½ LSB below the first code transition) through positive full scale (½ LSB above the
last code transition). The deviation of any given code from this straight line is measured from the center of
that code value. The end point test method is used. Measured at 20 MSPS with a ramp input.
INTERMODULATION DISTORTION (IMD) is the creation of spectral components that are not present in the
input as a result of two sinusoidal frequencies being applied to the ADC input at the same time. It is
defined as the ratio of the power in the second and third order intermodulation products to the total power
in one of the original frequencies. IMD is usually expressed in dB.
LSB (LEAST SIGNIFICANT BIT) is the bit that has the smallest value of weight of all bits. This value is
m * VREF/2
n
where
“m” is the reference scale factor
“n” is the ADC resolution, which is 10 in the case of the ADC10D020
The value of “m” is determined by the logic level at the gain pin and has a value of 1 when the gain pin
is at a logic low and a value of 2 when the gain pin is at a logic high.
(1)
MISSING CODES are those output codes that are skipped or will never appear at the ADC outputs. These
codes cannot be reached with any input value.
MSB (MOST SIGNIFICANT BIT) is the bit that has the largest value or weight. Its value is one half of full scale.
OFFSET ERROR is a measure of how far the mid-scale transition point is from the ideal zero voltage input.
Copyright © 2001–2013, Texas Instruments Incorporated
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