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參數(shù)資料
| 型號： | AD6645 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 14-Bit, 80 MSPS A/D Converter |
| 中文描述： | 14位，80 MSPS的A / D轉(zhuǎn)換 |
| 文件頁數(shù)： | 16/20頁 |
| 文件大?。?/td> | 2230K |
| 代理商： | AD6645 |
REV. 0
AD6645
–16–
Jitter Considerations
The signal-to-noise ratio (SNR) for an ADC can be predicted.
When normalized to ADC codes, the above equation accurately
predicts the SNR based on three terms. These are jitter, average
DNL error, and thermal noise. Each of these terms contributes
to the noise within the converter.
F
ANALOG
= analog input frequency
t
j rms
= rms jitter of the encode (rms sum of encode source and
internal encode circuitry)
= average DNL of the ADC (typically 0.41 LSB)
n
= number of bits in the ADC
V
NOISE rms
= V rms thermal noise referred to the analog input of
the ADC (typically 0.9 LSB rms)
For a 14-bit analog-to-digital converter, like the AD6645, aperture
jitter can greatly affect the SNR performance as the analog
frequency is increased. The chart below shows a family of curves
that demonstrate the expected SNR performance of the AD6645 as
jitter increases. The chart is derived from the above equation.
For a complete discussion of aperture jitter, please consult
AN-501,
“
Aperture Uncertainty and ADC System Performance.
”
JITTER – ps
550
0.1
S
60
65
70
75
80
0.2
0.3
0.4
0.5
0.6
AIN = 110MHz
AIN = 150MHz
AIN = 190MHz
AIN = 30MHz
AIN = 70MHz
Figure 12. Jitter vs. SNR
SNR
F
t
V
n
j rms
n
N
=
￥
￥
(
)
+
+
2
ê
ˉ +
￥
￥
2
ê
ˉ
è
í
í
ù
ú
ú
176 20
.
2
1
2
2
2
2
2
1
2
log
p
e
ANALOG
OISE rms
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD6645PCB | 14-Bit, 80 MSPS A/D Converter |
| AD6645ASQ-80 | 14-Bit, 80 MSPS A/D Converter |
| AD664BD-BIP | Monolithic 12-Bit Quad DAC |
| AD664BD-UNI | Monolithic 12-Bit Quad DAC |
| AD664JN-BIP | Monolithic 12-Bit Quad DAC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD6645/PCB | 制造商:AD 制造商全稱:Analog Devices 功能描述:14-Bit, 80 MSPS A/D Converter |
| AD6645-105/PCBZ | 制造商:Analog Devices 功能描述:645-105 EVALUATION BOARD - Bulk |
| AD6645-105PCB | 制造商:AD 制造商全稱:Analog Devices 功能描述:High Speed ADC USB FIFO Evaluation Kit |
| AD6645-105PCBZ1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:14-Bit, 80 MSPS/105 MSPS A/D Converter |
| AD6645-80/PCB | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
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