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參數資料
| 型號： | AD9782 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 12-Bit, 200 MSPS/500 MSPS TxDAC+ with 2 x /4 x /8 x Interpolation and Signal Processing |
| 中文描述： | 12位，200 MSPS/500 MSPS的TxDAC系列與2 × / 4 × / 8 ×插值與信號處理 |
| 文件頁數： | 27/52頁 |
| 文件大小： | 1619K |
| 代理商： | AD9782 |
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Preliminary Technical Data
AD9782
Figure 44 shows the same conditions, with DATAADJ now set
to 0001, thus moving DATACLK to the right in the plot. This
indicates that it occurs one DACCLK cycle after it did in
Figure 42. Now the latching edge of DACCLK moves forward in
time one cycle.
Rev. PrC | Page 27 of 52
0
RISING EDGE OF DATACLK
CONCURRENT WITH
LATCHING EDGE OF DACCLK
DATA TRANSITION
DACCLK
LATCHING EDGE
Figure 44. DATAADJ = 0001
INTERPOLATION MODES
Table 27.
INTERP[1]
0
0
1
1
INTERP[0]
0
1
0
1
Mode
No Interpolation
×2 Interpolation
×4 Interpolation
×8 Interpolation
Interpolation is the process of increasing the number of points
in a time domain waveform by approximating points between
the input data points; on a uniform time grid, this produces a
higher output data rate. Applied to an interpolation DAC, a
digital interpolation filter is used to approximate the interpo-
lated points, having an output data rate increased by the
interpolation factor. Interpolation filter responses are achieved
by cascading individual digital filter banks, whose filter
coefficients are given in Table 1; filter responses are shown in
Figure 34.
The digital filter’s frequency domain response exhibits
symmetry about half the output data rate and dc. It will cause
images of the input data to be shaped by the interpolation
filter’s frequency response. This has the advantage of causing
input data images, which fall in the stop band of the digital filter
to be rejected by the stop-band attenuation of the interpolation
filter; input data images falling in the interpolation filter’s pass-
band will be passed. In band-limited applications, the images at
the output of the DAC must be limited by an analog reconstruc-
tion filter. The complexity of the analog reconstruction filter is
determined by the proximity of the closest image to the
required signal band. Higher interpolation rates yield larger
stop-band regions, suppressing more input images and resulting
in a much relaxed analog reconstruction filter.
A DAC shapes its output with a sinc function, having a null at
the sampling frequency of the DAC. The higher the DAC sam-
pling rate compared to the input signal bandwidth, the less the
DAC sinc function will shape the output. Figure 45 shows the
interpolation filters of the AD9782 under different interpolation
rates, normalized to the input data rate, f
SIN
. The higher the
interpolation rate the more input data images fall in the
interpolation filter stop band and are rejected; the band-width
between passed images is larger with higher interpolation
factors. The sinc function shaping is also reduced with a higher
interpolation factor.
Table 28.
Mode
No Interpolation
×2 Interpolation
×4 Interpolation
×8 Interpolation
Sinc Shaping
at 0.43f
SIN
(dB)
–2.8241
–0.6708
–0.1657
–0.0413
Bandwidth to First Image
f
SIN
2f
SIN
4f
SIN
8f
SIN
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