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參數(shù)資料
| 型號(hào)： | AD9873 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Analog Front End Converter for Set-Top Box, Cable Modem |
| 中文描述： | 模擬前端轉(zhuǎn)換器，用于機(jī)頂盒，電纜調(diào)制解調(diào)器 |
| 文件頁(yè)數(shù)： | 8/39頁(yè) |
| 文件大小： | 935K |
| 代理商： | AD9873 |
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REV. 0
AD9873
–8–
DEFINITIONS OF TERMS
DIFFERENTIAL NONLINEARITY ERROR (DNL, NO
MISSING CODES)
An ideal converter exhibits code transitions that are exactly 1LSB
apart. DNL is the deviation from this ideal value. Guaranteed
no missing codes to 10-bit resolution indicates that all 1024 codes
respectively, must be present over all operating ranges.
INTEGRAL NONLINEARITY ERROR (INL)
Linearity error refers to the deviation of each individual code
from a line drawn from “negative full scale” through “positive
full scale.” The point used as “negative full scale” occurs 1/2 LSB
before the first code transition. “Positive full scale” is defined as
a level 1 1/2 LSB beyond the last code transition. The deviation
is measured from the middle of each particular code to the true
straight line.
PHASE NOISE
Single-sideband phase noise power density is specified relative to
the carrier (dBc/Hz) at a given frequency offset (1 kHz) from
the carrier. Phase noise can be measured directly in single tone
transmit mode with a spectrum analyzer that supports noise
marker measurements. It detects the relative power between the
carrier and the offset (1 kHz) sideband noise and takes the reso-
lution bandwidth (rbw) into account by subtracting 10 log (rbw).
It also adds a correction factor that compensates for the imple-
mentation of the resolution bandwidth, log display and detector
characteristic.
OUTPUT COMPLIANCE RANGE
The range of allowable voltage at the output of a current-output
DAC. Operation beyond the maximum compliance limits may
cause either output stage saturation, resulting in nonlinear per-
formance or breakdown.
SPURIOUS-FREE DYNAMIC RANGE (SFDR)
The difference, in dB, between the rms amplitude of the DACs
output signal (or ADC’s input signal) and the peak spurious
signal over the specified bandwidth (Nyquist bandwidth unless
otherwise noted).
PIPELINE DELAY (LATENCY)
The number of clock cycles between conversion initiation and the
associated output data being made available.
OFFSET ERROR
First transition should occur for an analog value 1/2 LSB above
negative full scale. Offset error is defined as the deviation of the
actual transition from that point.
GAIN ERROR
The first code transition should occur at an analog value 1/2LSB
above negative full scale. The last transition should occur for an
analog value 1 1/2 LSB below the nominal full scale. Gain error
is the deviation of the actual difference between first and last
code transitions and the ideal difference between first and last
code transitions.
APERTURE DELAY
Aperture delay is a measure of the Sample-and-Hold Amplifier
(SHA) performance and specifies the time delay between the
rising edge of the sampling clock input to when the input signal
is held for conversion.
APERTURE UNCERTAINTY (JITTER)
Aperture jitter is the variation in aperture delay for successive
samples and is manifested as noise on the input to the ADC.
SIGNAL-TO-NOISE + DISTORTION (SINAD) RATIO
SINAD is the ratio of the rms value of the measured input signal
to the rms sum of all other spectral components below the Nyquist
frequency, including harmonics but excluding dc. The value for
SINAD is expressed in decibels.
EFFECTIVE NUMBER OF BITS (ENOB)
For a sine wave, SINAD can be expressed in terms of the number
of bits. Using the following formula,
N
= (
SINAD
– 1.76) dB/6.02
it is possible to obtain a measure of performance expressed as
N
,
the effective number of bits.
SIGNAL-TO-NOISE RATIO (SNR)
SNR is the ratio of the rms value of the measured input signal to
the rms sum of all other spectral components below the Nyquist
frequency, excluding harmonics and dc. The value for SNR is
expressed in decibels.
TOTAL HARMONIC DISTORTION (THD)
THD is the ratio of the rms sum of the first six harmonic com-
ponents to the rms value of the measured input signal and is
expressed as a percentage or in decibels.
POWER SUPPLY REJECTION
Power supply rejection specifies the converters maximum full-scale
change when the supplies are varied from nominal to minimum
and maximum specified voltages.
CHANNEL-TO-CHANNEL ISOLATION (CROSSTALK)
In an ideal multichannel system, the signal in one channel will
not influence the signal level of another channel. The channel-
to-channel isolation specification is a measure of the change that
occurs to a grounded channel as a full-scale signal is applied to
another channel.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD9873-EB | Analog Front End Converter for Set-Top Box, Cable Modem |
| AD9873JS | Analog Front End Converter for Set-Top Box, Cable Modem |
| AD9874 | IF Digitizing Subsystem |
| AD9874BST | IF Digitizing Subsystem |
| AD9874EB | IF Digitizing Subsystem |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD9873-EB | 制造商:Analog Devices 功能描述: |
| AD9873JS | 制造商:Analog Devices 功能描述: |
| AD9874 | 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:IF Digitizing Subsystem |
| AD9874ABST | 功能描述:IC IF DIGIT SUBSYSTEM 48-LQFP RoHS:否 類(lèi)別:RF/IF 和 RFID >> RF 其它 IC 和模塊 系列:- 標(biāo)準(zhǔn)包裝:100 系列:* |
| AD9874ABST | 制造商:Analog Devices 功能描述:IF DIGITIZING SYBSYSTEM ((NW)) 制造商:Analog Devices 功能描述:IC, IF DIGITIZING SUBSYSTEM, LQFP-48 |
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