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参数资料
| 型号： | STEL-1175+125/MC |
| 厂商： | INTEL CORP |
| 元件分类： | 数字信号处理外设 |
| 英文描述： | 8-BIT, DSP-NUM CONTROLLED OSCILLATOR, CQCC68 |
| 封装： | CERAMIC, LDCC-68 |
| 文件页数： | 3/14页 |
| 文件大小： | 253K |
| 代理商： | STEL-1175+125/MC |
11
STEL-1175+125
The sine or cosine signals generated by the STEL-1175
have 12 bits of amplitude resolution and 13 bits of phase
resolution which results in spurious levels which are
theoretically at least 75 dB down. 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.
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.
HIGH-SPEED FREQUENCY CHANGE
USING THE STEL-1175
IN A HIGH-SPEED
PHASE MODULATOR
By routing the data and address
lines from the microcontroller via
2:1 multiplexers (e.g. 74HC157)
the MNCO can be set up from the
microcontroller and then phase
modulated at high-speed from an
external source. The PHSEL line
should be set to a logic 0 to enable
this mode of operation. The
system shown modulates all 12
bits. In a typical PSK system only
1 to 4 bits of modulation will be
used, simplifying the system
considerably.
APPLICATIONS INFORMATION
FRLD
CLOCK
WRSTB
ADDR
FRSEL
0100
0101
0110
0011
0000
0001
0010
1234
5
6
789
0111
0000
0111
WBP 54815.c-11/20/98
A
B
A/B
WRITE
WRSTB
FRLD
D4
D7
D0
D3
A
B
A/B
A
B
A/B
STEL-1175
MNCO
FREQ. LOAD
DATA0-7
ADDR0-3
PHASE0-11
FREQ. /PH SEL
PHASE LOAD
FROM
PHASE
MOD.
FROM
C
A0
A3
PHLD
4
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相关代理商/技术参数 |
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|---|---|
| STEL-1176/CM | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Numeric-Controlled Oscillator |
| STEL-1176/MC | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Numeric-Controlled Oscillator |
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| STEL-1177/CM | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Numeric-Controlled Oscillator |
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