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| 型号： | EVAL-AD9838SDZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 5/32页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD9838 |
| 产品培训模块： | Direct Digital Synthesis Tutorial Series (1 of 7): Introduction Direct Digital Synthesizer Tutorial Series (7 of 7): DDS in Action Direct Digital Synthesis Tutorial Series (3 of 7): Angle to Amplitude Converter Direct Digital Synthesis Tutorial Series (6 of 7): SINC Envelope Correction Direct Digital Synthesis Tutorial Series (4 of 7): Digital-to-Analog Converter Direct Digital Synthesis Tutorial Series (2 of 7): The Accumulator |
| 标准包装： | 1 |
| 主要目的： | 计时，直接数字合成（DDS） |
| 嵌入式： | 否 |
| 已用 IC / 零件： | AD9838 |
| 主要属性： | USB 供电或外部电源 |
| 次要属性： | SPI 接口 |
| 已供物品： | 板，线缆，CD，文档 |
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AD9838
Rev. A | Page 13 of 32
TERMINOLOGY
Integral Nonlinearity (INL)
Total Harmonic Distortion (THD)
INL is the maximum deviation of any code from a straight line
passing through the endpoints of the transfer function. The
endpoints of the transfer function are zero scale, a point 0.5 LSB
below the first code transition (000 … 00 to 000 … 01), and full
scale, a point 0.5 LSB above the last code transition (111 … 10
to 111 … 11). The error is expressed in LSBs.
Total harmonic distortion (THD) is the ratio of the rms sum of
harmonics to the rms value of the fundamental. For the AD9838,
THD is defined as
1
2
6
2
5
2
4
2
3
2
log
20
V
THD
+
=
Differential Nonlinearity (DNL)
where:
V1
is the rms amplitude of the fundamental.
V2
, V3, V4, V5, and V6 are the rms amplitudes of the second
through sixth harmonics.
DNL is the difference between the measured and ideal 1 LSB
change between two adjacent codes in the DAC. A specified
DNL of ±1 LSB maximum ensures monotonicity.
Output Compliance
Signal-to-Noise Ratio (SNR)
Output compliance refers to the maximum voltage that can be
generated at the output of the DAC to meet the specifications.
When voltages greater than that specified for the output compli-
ance are generated, the AD9838 may not meet the specifications
listed in the data sheet.
SNR is the ratio of the rms value of the measured output signal
to the rms sum of all other spectral components below the
Nyquist frequency. The value for SNR is expressed in decibels.
Clock Feedthrough
There is feedthrough from the MCLK input to the analog
output. Clock feedthrough refers to the magnitude of the
MCLK signal relative to the fundamental frequency in the
output spectrum of the AD9838.
Spurious-Free Dynamic Range (SFDR)
Along with the frequency of interest, harmonics of the funda-
mental frequency and images of these frequencies are present at
the output of a DDS device. The spurious-free dynamic range
(SFDR) refers to the largest spur or harmonic present in the
band of interest. The wideband SFDR gives the magnitude of
the largest spur or harmonic relative to the magnitude of the
fundamental frequency in the 0 to Nyquist bandwidth. The
narrow-band SFDR gives the attenuation of the largest spur or
harmonic in a bandwidth of ±200 kHz about the fundamental
frequency.
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