參數(shù)資料
型號(hào)： TDA8768AH
廠商： NXP Semiconductors N.V.
英文描述： 12-bit, 70 Msps Analog-to-Digital Converter (ADC)
中文描述： 12位，70 Msps的模擬到數(shù)字轉(zhuǎn)換器（ADC）
文件頁(yè)數(shù)： 24/32頁(yè)
文件大?。?/td> 915K
代理商： TDA8768AH
Philips Semiconductors
TDA8768A
12-bit, 70 Msps Analog-to-Digital Converter (ADC)
Product data
Rev. 02 — 03 July 2002
24 of 32
9397 750 09656
Koninklijke Philips Electronics N.V. 2002. All rights reserved.
12.1.2
Dynamic parameters (single tone)
Figure 26
shows the spectrum of a full-scale input sine wave with frequency f
t
,
conforming to coherent sampling (f
t/
f
s
= M/N, where M is the number of cycles and N
is 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”.
Signal-to-noise and distortion (SINAD):
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:
P
P
noise
distortion
+
Effective Number of Bits (ENOB):
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:
ENOB
SINAD dB
]
1 76
(
)
–
(
)
6 02
(
=
Total Harmonic Distortion (THD):
The ratio of the power of the harmonics to the
power of the fundamental. For k-1 harmonics the THD is:
P
P
signal
where
The value of k is usually 6 (i.e. calculation of THD is done on the first 5 harmonics).
Fig 26. Spectrum of full-scale input sine wave with frequency f
t
.
magnitude
fs/2
SFDR
a1
a2
a3
ak
s
FCE710
measured output range
SINAD db
]
10
------------------------------------------
log
=
)
THD dB
]
10
--------------------------
log
=
P
harmonics
a
2
2
a
3
2
a
k
2
+
+
=
P
signal
a
1
2
=
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