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| 型號： | TDA9910 |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | ADC |
| 英文描述： | 12-bit, up to 80 Msample/s, Analog-to-Digital Converter (ADC) direct/ultra high IF sampling |
| 中文描述： | 12位，高達(dá)80 Msample /秒，模擬到數(shù)字轉(zhuǎn)換器（ADC）直接/超高IF采樣 |
| 文件頁數(shù)： | 13/21頁 |
| 文件大?。?/td> | 138K |
| 代理商： | TDA9910 |
9397 750 14418
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Objective data sheet
Rev. 02 — 9 December 2004
13 of 21
Philips Semiconductors
TDA9910
12-bit, up to 80 Msample/s, Analog-to-Digital Converter (ADC)
where:
10.2 Dynamic parameters
Figure 7
shows the spectrum of a single tone full-scale input sine wave with frequency f
t
,
conforming to coherent sampling (f
t
/f
s
= M/N, with M number of cycles and N number of
samples, M and N being relatively prime), and digitized by the ADC under test.
Remark:
In the following equations, P
noise
is the power of the terms which include the
effects of random noise, non-linearities, sampling time errors, and “quantization noise”.
10.2.1
SINAD (signal-to-noise and distortion)
The ratio of the output signal power to the noise plus distortion power for a given sample
rate and input frequency, excluding the DC component:
10.2.2
ENOB (effective number of bits)
It is derived from SINAD and gives the theoretical resolution an ideal ADC would require
to obtain the same SINAD measured on the real ADC. A good approximation gives:
10.2.3
THD (total harmonic distortion)
The ratio of the power of the harmonics to the power of the fundamental. For k
1
harmonics the THD is:
i
0x 2
n
2
–
)
=
Fig 7.
Single tone spectrum of full-scale input sine wave with frequency f
t
.
a2
a3
ak
a1
SFDR
001aaa518
f
s
/2
measured output range (MHz)
magnitude
SINAD dB
]
10log
10
P
P
noise
distortion
+
---------------------------------------
=
ENOB
----------------------------------
–
6.02
=
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