參數(shù)資料
型號(hào)： AD9786BSVRL
廠商： ANALOG DEVICES INC
元件分類： DAC
英文描述： 16-Bit, 200 MSPS/500 MSPS TxDAC+ with 2】/4】/8】 Interpolation and Signal Processing
中文描述： PARALLEL, WORD INPUT LOADING, 16-BIT DAC, PQFP80
封裝： PLASTIC, MS-026-ADD, TQFP-80
文件頁(yè)數(shù)： 32/60頁(yè)
文件大小： 1497K
代理商： AD9786BSVRL
AD9786
Interpolation Modes
Rev. 0 | Page 32 of 60
Table 28. Interpolation Modes
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 inter-
polated 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 23, Table 24, and Table 25. Filter
responses are shown in Figure 57, which shows the interpola-
tion filters of the AD9786 under different interpolation rates,
normalized to the input data rate, f
SIN
.
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. The higher the
interpolation rate, the more input data images fall in the
interpolation filter stop band and are rejected; the bandwidth
between passed images is larger with higher interpolation
factors. The sinc function shaping is also reduced with a higher
interpolation factor.
Table 29. Sinc Shaping at Band Edge of Interpolation Filters
Sinc Shaping
at 0.43f
SIN
(dB)
No Interpolation
–2.8241
×2 Interpolation
–0.6708
×4 Interpolation
–0.1657
×8 Interpolation
–0.0413
Mode
Bandwidth to First Image
f
SIN
2f
SIN
4f
SIN
8f
SIN
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