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參數(shù)資料
| 型號： | TDA8769 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 12-bit, 60/80/105 Msps Analog-to-Digital Converter (ADC) Nyquist/high IF sampling |
| 中文描述： | 12位，60/80/105 Msps的模擬到數(shù)字轉(zhuǎn)換器（ADC）奈奎斯特/ IF采樣高 |
| 文件頁數(shù)： | 22/28頁 |
| 文件大?。?/td> | 217K |
| 代理商： | TDA8769 |
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2003 Dec 09
22
Philips Semiconductors
Objective specification
12-bit, 60/80/105 Msps Analog-to-Digital Converter
(ADC) Nyquist/high IF sampling
TDA8769
11.5.2.1
Signal-to-noise and distortion (SINAD)
SINAD is the ratio of the signal power to the noise plus
distortion power, excluding the DC component, at a given
sample rate and input frequency:
dB.
11.5.2.2
Effective number of bits (ENOB)
ENOB is derived from SINAD and gives the theoretical
resolution an ideal ADC would require to obtain the same
SINAD measured on the actual ADC. A good
approximation is:
11.5.2.3
Total harmonic distortion (THD)
THD is the ratio of the power of the harmonics to the power
of the signal frequency. The equation for k
1 harmonics
is:
dB
where:
As usual the value of k = 6 (i.e. the calculation of THD is
done with the first 5 harmonics).
11.5.2.4
Signal-to-noise ratio (SNR)
SNR is the ratio of the signal power to the noise power,
excluding the harmonics and DC component of the signal:
dB
11.5.2.5
Spurious free dynamic range (SFDR)
The SFDR specifies the available signal range as the
spectral distance between the amplitude of the
fundamental and the amplitude of the largest spurious
signal, harmonic and non-harmonic, excluding the
DC component.
dB
11.5.2.6
Intermodulation distortion (IMD2 and IMD3)
Figure 16 shows the spectral analysis of a dual tone sine
wave input, at frequencies f
t1
and f
t2
, meeting the
coherence criterion.
The 2nd and 3rd order intermodulation distortion products,
IMD2 and IMD3 respectively, are defined with a dual tone
input. IMD2 is defined as the ratio of the RMS value of
either tone to the RMS value of the second order
intermodulation product, IMD3 with the third order
intermodulation product. The IMD is given by:
dB
SINAD
10log
10
P
noise + distortion
P
=
ENOB
SINAD
1.76
–
6.02
=
THD
10log
10
P
P
signal
------------------------
=
P
harmonics
a
2
2
a
3
2
...
a
k
2
+
+
+
=
P
signal
a
1
2
=
SNR
10log
10
P
P
noise
---------------
=
SFDR
10log
10
a
max s
-------------------
=
IMD
10log
10
P
signal
-P
=
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