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参数资料
| 型号： | 5962-9561501MLX |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | ADC |
| 英文描述： | 8-CH 12-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, CDIP24 |
| 封装： | 0.300 INCH, HERMETIC SEALED, CERDIP-24 |
| 文件页数： | 11/22页 |
| 文件大小： | 203K |
| 代理商： | 5962-9561501MLX |
REV. B
AD7890
–19–
INPUT FREQUENCY – kHz
0
EFFECTIVE
NUMBER
OF
BITS
12.0
11.5
11.0
10.5
10.0
20
40
Figure 21. Effective Number of Bits vs. Frequency
Effective Number of Bits
The formula for Signal to (Noise + Distortion) Ratio (See Ter-
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
The 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. The sampling
frequency is 102.4 kHz. The 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.
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