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參數(shù)資料
| 型號： | STEL-1173/CM |
| 廠商： | INTEL CORP |
| 元件分類： | 數(shù)字信號處理外設(shè) |
| 英文描述： | 8-BIT, DSP-NUM CONTROLLED OSCILLATOR, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁數(shù)： | 11/11頁 |
| 文件大?。?/td> | 188K |
| 代理商： | STEL-1173/CM |
9
STEL-1173
If the STEL-1173 is combined with a suitable high-speed DAC, signals with spectral purity of better than
–65 dBc can be generated up to 10 MHz. In this way a signal can be generated in the 70 MHz band for
use in a baseband downconverter tracking oscillator. The very high frequency resolution of the STEL-
1173 allows the incoming signal to be tracked very closely and with minimal "hunting", resulting in low
phase noise. The phase continuous frequency switching characteristics of the STEL-1173 also make it
suitable for use in Frequency Hopping Spread Spectrum applications.
DATA
LDSTB
RESET
D/A
CLK
66-74 MHz
12
STEL-
1173
NCO
50 MHz CLOCK
SINE
BPF
6-14
MHz
ADDR 0-2
BPF66-74
MHz
60 MHz
OSCILLATOR
3
8
WR
about –75 dBc. The highest output frequency the NCO
can generate is half the clock frequency (fc /2), and the
spurious components at frequencies greater than fc/2
can be removed by filtering. As the output frequency
fo of the NCO approaches fc /2, the "image" spur at
fc–fo (created by the sampling process) also approaches
fc/2 from above. If the programmed output frequency
is very close to fc/2 it will be virtually impossible to
remove this image spur by filtering. For this reason,
the maximum practical output frequency of the NCO
should be limited to about 40% of the clock frequency.
SPECTRAL PURITY
In many applications the NCO is used with a Digital to
Analog converter (DAC) to generate an analog
waveform which approximates an ideal sinewave.
The spectral purity of this synthesized waveform is a
function of many variables including the phase and
amplitude quantization, the ratio of the clock
frequency to output frequency, and the dynamic
characteristics of the DAC.
The signals generated by the STEL-1173 have 12 bits of
amplitude resolution and 13 bits of phase resolution
which results in spurious levels which are theoretically
TYPICAL APPLICATION
HIGH PURITY, HIGH RESOLUTION SYNTHESIZER
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