參數(shù)資料
型號(hào): LTC1406
廠商: Linear Technology Corporation
英文描述: Low Power, 8-Bit, 20Msps, Sampling A/D Converter(低功耗,12位, 20Msps,采樣模數(shù)轉(zhuǎn)換器)
中文描述: 低功耗,8位,20Msps,采樣A / D轉(zhuǎn)換器(低功耗,12位,20Msps,采樣模數(shù)轉(zhuǎn)換器)
文件頁數(shù): 8/16頁
文件大小: 367K
代理商: LTC1406
8
LTC1406
where ENOB is the effective number of bits and S/(N + D)
is expressed in dB. At the maximum sampling rate of 20MHz
the LTC1406 maintains near ideal ENOBs up to and be-
yond the Nyquist input frequency of 10MHz (see Figure 3).
APPLICATIO
S I
FOR
ATIO
U
0
W
U
U
FREQUENCY (Hz)
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
A
1406 F02a
0
1
2
3
4
5
6
7
8
9
10
f
SAMPLE
= 20MHz
f
SFDR = 64.8dB
SINAD = 48.6dB
Figure 2a. Nonaveraged, 4096 Point FFT
Input Frequency = 1MHz
Signal-to-Noise Ratio
The signal-to-noise plus distortion ratio [S/(N + D)] is the
ratio between the RMS amplitude of the fundamental input
frequency and the RMS amplitude of all other frequency
components at the ADC output. The output is band limited
to frequencies above DC to below half the sampling fre-
quency. The effective number of bits (ENOBs) is a mea-
surement of the resolution of an ADC and is directly related
to the S/(N + D) by the equation:
ENOB = [S/(N + D) – 1.76]/6.02
Figure 2b. Nonaveraged, 4096 Point FFT
Input Frequency = 30MHz
Total Harmonic Distortion
Total harmonic distortion is the ratio of the RMS sum of all
harmonics of the input signal to the fundamental itself. The
out-of-band harmonics alias into the frequency band
between DC and half the sampling frequency. THD is
expressed as:
THD
V
V
=
+
+
V
+
20
3
2
4
2
log
V
. . .V
2
2
n
2
1
where V
1
is the RMS amplitude of the fundamental fre-
quency and V
2
through V
n
are the amplitudes of the sec-
ond through n
th
harmonics. THD vs Input Frequency is
shown in Figure 4. The LTC1406 has good distortion per-
formance up to the Nyquist frequency and beyond.
Intermodulation Distortion
If the ADC input signal consists of more than one spectral
component, the ADC transfer function nonlinearity can
produce intermodulation distortion (IMD) in addition to
THD. IMD is the change in one sinusoidal input caused by
the presence of another sinusoidal input at a different fre-
quency (see Figure 5).
INPUT FREQUENCY (Hz)
E
S
2
4
6
100k
1M
10M
100M
1406 TA02
0
3
5
7
1
8
50
44
38
32
Figure 3. Effective Bits and Signal-to-(Noise + Distortion)
vs Input Frequency
FREQUENCY (Hz)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
A
1406 F02b
0
1
2
3
4
5
6
7
8
9
10
f
SAMPLE
= 20MHz
f
SFDR = 54.9dB
SINAD = 47.0dB
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