參數(shù)資料
型號： AD6652XBC
廠商： ANALOG DEVICES INC
元件分類： 通信及網(wǎng)絡
英文描述： SPECIALTY TELECOM CIRCUIT, PBGA256
封裝： 17 X 17 MM, MINI, BGA-256
文件頁數(shù)： 14/76頁
文件大?。?/td> 1802K
代理商： AD6652XBC
Preliminary Technical Data
AD6652
Rev. PrC | Page 21 of 76
gnal
le
upling and mixing components.
)
e
limited
to N
ove Nyquist are aliased and
e
re
mus
to limit the bandwidth of the sampled signal so
t i
itself. IF
of the input
A
itter adds
r
s.)
q
t least
Out-of-range recovery time is the time it takes for the A/D
r
e full
ain. By using large decimation factors, this process-
e.
n:
TERMINOLOGY
Crosstalk
Coupling onto one channel being driven by a (0.5 dBFS) si
when the adjacent interfering channel is driven by a full-sca
signal. Measurement includes all spurs resulting from both
direct co
IF Sampling (Undersampling
Du to the effects of aliasing, an ADC is not necessarily
yquist sampling. Frequencies ab
app ar in the first Nyquist zone (dc to Sample Rate/2). Ca
t be taken
tha t does not overlap Nyquist zones and alias onto
sampling performance is limited by the bandwidth
SH (sample-and-hold amplifier) and clock jitter. (J
mo e noise at higher input frequencie
Ny uist Sampling (Oversampling)
Oversampling occurs when the frequency components of the
analog input signal are below the Nyquist frequency (Fclock/2),
and requires that the analog input frequency be sampled a
2 samples per cycle.
Out-of-Range Recovery Time
converter to reacquire the analog input after a transient from
10% above positive full scale to 10% above negative full scale, o
from 10% below negative full scale to 10% below positiv
scale.
Processing Gain
When the tuned channel occupies less bandwidth than the
input signal, this rejection of out-of-band noise is referred to as
processing g
ing gain can improve the SNR of the ADC by 20 dB or mor
The following equation can be used to estimate processing gai
=
Bandwidth
Filter
Rate
Sample
_Gain
Processing
_
2
_
log
10
Signal-to-Noise Ratio (SNR)
The ratio of the rms value of the measured input signal t
rms sum of all other spectral compo
o the
nents within the
CUITS
programmed DDC filter bandwidth, excluding the first six
harmonics and dc. The value for SNR is expressed in decibels.
Two-Tone IMD Rejection
The ratio of the rms value of either input tone to the rms value
of the worst third-order intermodulation product; reported in
dBc.
ADC EQUIVALENT CIR
AVDD
03198-0-022
Figure 28. Analog Input Circuit
AVDD
03198-0-023
Figure 29. Digital Input
VDD
03198-0-024
Figure 30. Digital Output
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