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參數資料
| 型號： | LTC1419AIG |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 14-Bit, 800ksps Sampling A/D Converter with Shutdown |
| 中文描述： | 1-CH 14-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDSO28 |
| 封裝： | 0.209 INCH, PLASTIC, SSOP-28 |
| 文件頁數： | 8/20頁 |
| 文件大?。?/td> | 401K |
| 代理商： | LTC1419AIG |
8
LTC1419
APPLICATIO
S I
N
FOR
ATIO
U
frequencies outside the fundamental. Figure 2 shows a
typical LTC1419 FFT plot.
W
U
Effective Number of Bits
The effective number of bits (ENOBs) is a measurement of
the resolution of an ADC and is directly related to the
S/(N + D) by the equation:
N = [S/(N + D) – 1.76]/6.02
where N is the effective number of bits of resolution and
S/(N + D) is expressed in dB. At the maximum sampling
rate of 800kHz the LTC1419 maintains near ideal ENOBs
up to the Nyquist input frequency of 400kHz (refer to
Figure 3).
FREQUENCY (kHz)
0
A
–60
–40
–20
300
1419 F02a
–80
–100
100
200
400
250
50
150
350
–120
–140
0
f
SAMPLE
= 800kHz
f
= 99.804687kHz
SFDR = 98dB
THD = –93.3dB
Figure 2a. LTC1419 Nonaveraged, 4096 Point FFT,
Input Frequency = 100kHz
FREQUENCY (kHz)
0
A
–60
–40
–20
300
1419 F02b
–80
–100
100
200
400
250
50
150
350
–120
–140
0
f
SAMPLE
= 800kHz
f
SFDR = 88.3dB
SINAD = 80.1
Figure 2b. LTC1419 Nonaveraged, 4096 Point FFT,
Input Frequency = 375kHz
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 to the RMS amplitude of all other frequency
components at the A/D output. The output is band limited
to frequencies from above DC and below half the sampling
frequency. Figure 2 shows a typical spectral content with
a 800kHz sampling rate and a 100kHz input. The dynamic
performance is excellent for input frequencies up to and
beyond the Nyquist limit of 400kHz.
Total Harmonic Distortion
Total harmonic distortion (THD) 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
Log
V
V
V
1
Vn
V
=
+
+
+…
20
2
3
4
2
2
2
2
where V1 is the RMS amplitude of the fundamental fre-
quency and V2 through Vn are the amplitudes of the
second through nth harmonics. THD vs Input Frequency is
shown in Figure 4. The LTC1419 has good distortion
performance up to the Nyquist frequency and beyond.
INPUT FREQUENCY (Hz)
E
S
10k
100k
1M 2M
1419 TA02
1k
14
13
12
11
10
9
8
7
6
5
4
3
2
86
80
74
68
62
f
SAMPLE
= 800kHz
Figure 3. Effective Bits and Signal/(Noise + Distortion)
vs Input Frequency
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