參數(shù)資料
型號(hào): AD7890
廠商: Analog Devices, Inc.
英文描述: 8-Channel, 12-Bit Serial, Data Acquisition System(LC2MOS 8通道12位串行DAS)
中文描述: 8通道,12位串行,數(shù)據(jù)采集系統(tǒng)(LC2MOS 8通道12位串行DAS)的
文件頁(yè)數(shù): 19/20頁(yè)
文件大?。?/td> 312K
代理商: AD7890
AD7890
–19–
REV. A
E ffective Number of Bits
T he formula for Signal to (Noise + Distortion) Ratio (See T er-
minology section) is related to the resolution or number of bits
in the converter. Rewriting the formula, below, gives a measure
of performance expressed in effective number of bits (N):
N = (SNR —
1.76)/6.02
where
SNR
is Signal to (Noise + Distortion) Ratio
T he effective number of bits for a device can be calculated
from its measured Signal to (Noise + Distortion) Ratio. Fig-
ure 21 shows a typical plot of effective number of bits versus
frequency for the AD7890-2 from dc to 40 kHz. T he sampling
frequency is 102.4 kHz. T he plot shows that the AD7890 con-
verts an input sine wave of 40 kHz to an effective numbers of
bits of 11 which equates to a Signal to (Noise + Distortion)
level of 68 dB.
12
10
0
40
11.5
10.5
11
20
E
INPUT FREQUENCY – kHz
Figure 21. Effective Number of Bits vs. Frequency
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相關(guān)代理商/技術(shù)參數(shù)
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