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參數(shù)資料
| 型號： | AD9786BSV |
| 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(shù)： | 47/60頁 |
| 文件大小： | 1497K |
| 代理商： | AD9786BSV |
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AD9786
ANALOG OUTPUT
The analog output of the AD9786 is accessed via connector S3.
Once all settings are selected and current levels and SPI port
functionality are verified, the analog signal at S3 can be viewed.
For most of the AD9786’s applications, a spectrum analyzer is
the instrument of choice to verify proper performance. A typical
spectral plot is shown in Figure 86, with the AD9786 synthesiz-
ing a two-tone signal in the default mode with a 200 MSPS
sample rate. A single tone CW signal should provide output
power of approximately +0.5 dBm to the spectrum analyzer.
Rev. 0 | Page 47 of 60
If the spectrum does not look correct at this point, the data
input may be violating setup and hold times with respect to the
input clock. To correct this, the user should vary the input data
timing. If this is not possible, SPI Register 02h, Bit 4
(DCLKPOL) can be inverted. This bit controls the clock edge
upon which the data is latched. If these methods do not correct
the spectrum, it is unlikely that the issue is timing related. This
note should then be reread to verify that all instructions have
been followed.
0
STOP 200MHz
START 100MHz
19.9MHz/
0
–20
–10
–40
–30
–60
–50
–80
–70
–100
–90
–110
–120
1MA
A
0dBm
MARKER 1 [T1]
193.00170300MHz
–84.96dBm
VBW
SWT
RBW
30kHz
560ms
30kHz
UNIT
RF ATT
dBm
20dB
REF LVL
1AVG
Figure 86. Typical Spectral Plot
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