參數(shù)資料
型號(hào)： ADAV803ASTZ-REEL
廠(chǎng)商： ANALOG DEVICES INC
元件分類(lèi)： 消費(fèi)家電
英文描述： 8-Channel 14-Bit Single-Supply Voltage-Output DAC; Package: LQFP (10x10mm); No of Pins: 52; Temperature Range: Industrial
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP64
封裝： ROHS COMPLIANT, MS-026BCD, LQFP-64
文件頁(yè)數(shù)： 19/56頁(yè)
文件大?。?/td> 906K
代理商： ADAV803ASTZ-REEL
ADAV803
SAMPLE RATE CONVERTER (SRC) FUNCTIONAL O
During asynchronous samp
erted at the same sample rate
plest approach to an asynchronous sample rate
conversi
samplers, as shown in Figure 29. In an asynchronous syste
is never equal to T1, nor is the ratio between T2 and T1 ra
As a result, samples
an error in the resam
Rev. 0 | Page 19 of 56
VERVIEW
le rate conversion, data can be
or at
differen
conv
The sim
t sam
rates.
ple
on is to use a zero-order hold between the two
m, T2
tional.
at f
S_OUT
are repeated or dropped, producing
pling process.
t r
S_OUT
ated images from the SIN(x)/x nature of the zero-
r hold. The images at f
S_IN
(dc signal imag
old are i
ly attenuated. Because t
s an irrational number, the error resulting f
resampling at f
S_OUT
ca
significantly reduced, however, through interpolation of t
input data at f
S_IN
. Therefore, the sample rate converter in t
ADAV803 is concep
orde
order h
T1 i
es) of the zero-
he ratio of T2 to
rom the
nfinite
n never be eliminated. The error can be
he
he
tually interpolated by a factor of 2
20
.
The frequency domain shows the wide side lobes tha esult
from this error when the sampling of f
the attenu
is convolved with
0
SPECTRUM OF
f
S_OUT
SAMPLING
f
S_OUT
2 ×
f
S_OUT
FREQUENCY RESPONSE OF
f
CONVOLVED
WITH ZERO-ORDER HOLD SPECTRUM
ZERO-ORDER
HOLD
f
S_IN
=1/T1
f
S_OUT
= 1/T2
ORIGINAL SIGNAL
SAMPLED AT
f
S_IN
SIN(X)/X OF ZERO-ORDER HOLD
SPECTRUM OF ZERO-ORDER HOLD OUTPUT
OUT
IN
Figure 29. Zero-Order Hold Used by f
S_ OUT
to Resample Data from f
S_IN
Conceptual High Interpolation Model
Interpolation of the input data by a factor of 2
20
involves placin
(2
20
1) samples between each f
S_IN
sample. Figure 30 shows
both the time domain and the frequency domain of
interpolation by a factor of 2
20
. Conceptually, interpolation b
2
20
involves the steps of zero-stuffing (2
20
1) number of
samples between each f
S_IN
sample and convolving this
interpolated signal with a digital low-pass filter
images. In the time domain, it can be een at f
S_OUT
selects the
closest f
S_IN
× 2
20
sample from the zero-order hold, as opposed to
the nearest f
S_IN
sample in the case of no interpolation. This
significantly reduces the resampling error.
g
y
to suppress the
s
0
f
S_IN
f
S_OUT
IN
OUT
INTERPOLATE
BY N
LOW-PASS
FILTER
ZERO-ORDER
HOLD
TIME DOMAIN OF
f
S_IN
SAMPLES
TIME DOMAIN OUTPUT OF THE LOW-PASS FILTER
TIME DOMAIN OF
f
S_OUT
RESAMPLING
TIME DOMAIN OF THE ZERO-ORDER HOLD OUTPUT
of the zero-order hold. The images
from the interpolation can be sufficiently attenuated by a good
low-pass filter. The images from the zero-order hold are now
pushed by a factor of 2
20
closer to the infinite attenuation point
of the zero-order hold, which is f
S_IN
× 2
20
. The images at the
zero-order hold are the determining factor for the fidelity of the
output at f
S_OUT
.
Figure 30. SRC Time Domain
In the frequency domain shown in Figure 31, the interpolation
expands the frequency axis
f
S_IN
f
0
S_IN
f
S_OUT
OUT
IN
INTERPOLATE
BY N
LOW-PASS
FILTER
ZERO-ORDER
HOLD
FREQUENCY DOMAIN OF SAMPLES AT
f
S_IN
2
20
×
f
S_IN
2
20
×
f
S_IN
2
20
×
f
S_IN
FREQUENCY DOMAIN OF THE INTERPOLATION
FREQUENCY DOMAIN OF
f
S_OUT
RESAMPLING
FREQUENCY DOMAIN
AFTER RESAMPLING
SIN(X)/X OF ZERO-ORDER HOLD
ling
Figure 31. Frequency Domain of the Interpolation and Resamp
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