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| 型號： | 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 |
| 文件頁數： | 34/60頁 |
| 文件大小： | 1497K |
| 代理商： | AD9786BSVRL |
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AD9786
Rev. 0 | Page 34 of 60
MODULATION MODES
Table 30. Single Channel Modulation
MODDUAL
0
0
0
0
0
0
0
0
CHANNEL
0
0
0
0
1
1
1
1
MOD[1]
0
0
1
1
0
0
1
1
MOD[0]
0
1
0
1
0
1
0
1
Mode
I Channel, no modulation
I Channel, modulation by f
DAC
/2
I Channel, modulation by f
DAC
/4
I Channel, modulation by f
DAC
/8
Q Channel, no modulation
Q Channel, modulation by f
DAC
/2
Q Channel, modulation by f
DAC
/4
Q Channel, modulation by f
DAC
/8
Either channel of the AD9786’s interpolation filter channels can
be routed to the DAC and modulated. In single channel
operation the input data may be modulated by a real sinusoid;
the input data and the modulating sinusoid will contain both
positive and negative frequency components. A double side-
band output results when modulating two real signals. At the
DAC output the positive and negative frequency components
will add in phase resulting in constructive signal summation.
As the modulating sinusoidal frequency becomes a larger
fraction of the DAC update rate, f
DAC,
the more the sinc function
of the DAC shapes the modulated signal bandwidth, and the
closer the first image moves. As the AD9786 interpolation
filter’s pass band represents a large portion of the input data’s
Nyquist band, under certain modulation and interpolation
modes it is possible for modulated signal bands to touch or
overlap images if sufficient interpolation is not used.
Figure 59 shows the effects of f
DAC
/8 modulation when using
8
×
interpolation.
Figure 60 to Figure 62 show the effects of real modulation
under all interpolation modes. The sinc shaping at the corners
of the modulated signal band, and the bandwidth to the first
image for those cases whose pass bands do not touch or overlap,
are tabulated.
Table 31. Synthesis Bandwidth vs. Interpolation Modes
Modulation
None
none
f
SIN
f
DAC
/2
f
SIN
f
DAC
/4
Overlap
f
DAC
/8
Overlap
Interpolation
×2
2 f
SIN
2 f
SIN
Touching
Overlap
×4
4 f
SIN
4 f
SIN
2 f
SIN
Touching
×8
8 f
SIN
8 f
SIN
4 f
SIN
6 f
SIN
Table 32. Modulated Pass-Band Edges Sinc Shaping
(Lower/Upper)
Modulation
None
None
0
–2.8241
f
DAC
/2
–0.0701
–22.5378
f
DAC
/4
Overlap
f
DAC
/8
Overlap
Interpolation
×2
0
–0.6708
–1.1932
–9.1824
Touching
Overlap
×4
0
–0.1657
–2.3248
–6.1190
–0.2921
–1.9096
Touching
×8
0
–0.0413
–3.0590
–4.9337
–0.5974
–1.3607
–0.0727
–0.4614
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