APPLICATIONS INFOR
參數(shù)資料
型號: LTC1416CG#TR
廠商: Linear Technology
文件頁數(shù): 19/20頁
文件大?。?/td> 0K
描述: IC ADC 14BIT 400KSPS SMPL 28SSOP
標準包裝: 2,000
位數(shù): 14
采樣率(每秒): 400k
數(shù)據(jù)接口: 并聯(lián)
轉(zhuǎn)換器數(shù)目: 1
功率耗散(最大): 100mW
電壓電源: 雙 ±
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 28-SSOP(0.209",5.30mm 寬)
供應(yīng)商設(shè)備封裝: 28-SSOP
包裝: 帶卷 (TR)
輸入數(shù)目和類型: 2 個單端,雙極;1 個差分,雙極
8
LTC1416
APPLICATIONS INFORMATION
WU
U
Figure 3. Effective Bits and Signal/(Noise + Distortion)
vs Input Frequency
DYNAMIC PERFORMANCE
The LTC1416 has excellent high speed sampling capabil-
ity. FFT (Fast Fourier Transform) test techniques are used
to test the ADC’s frequency response, distortion and noise
at the rated throughput. By applying a low distortion sine
wave and analyzing the digital output using an FFT algo-
rithm, the ADC’s spectral content can be examined for
frequencies outside the fundamental. Figure 2 shows a
typical LTC1416 FFT plot.
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 2a shows a typical spectral content with
a 400kHz sampling rate and a 100kHz input. The dynamic
performance is excellent for input frequencies up to and
beyond the Nyquist limit of 200kHz, Figure 2b.
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:
ENOB = [S/(N + D) – 1.76]/6.02
where ENOB is the Effective Number of Bits of resolution
and S/(N + D) is expressed in dB. At the maximum
sampling rate of 400kHz, the LTC1416 maintains near
ideal ENOBs up to the Nyquist input frequency of 200kHz
(refer to Figure 3).
FREQUENCY (kHz)
0
AMPLITUDE
(dB)
150
1416 F02a
50
100
200
0
–20
–40
–60
–80
–100
–120
–140
25
75
125
175
fSAMPLE = 400kHz
fIN = 101.5625kHz
SFDR = 95.2dB
SINAD = 80.5dB
FREQUENCY (kHz)
0
AMPLITUDE
(dB)
150
1416 F02b
50
100
200
0
–20
–40
–60
–80
–100
–120
–140
25
75
125
175
fSAMPLE = 400kHz
fIN = 189.9414kHz
SFDR = 94.8dB
SINAD = 80.2dB
INPUT FREQUENCY (Hz)
1k
EFFECTIVE
BITS
SIGNAL/(NOISE
+
DISTORTION)
(dB)
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
86
80
74
68
62
10k
100k
1416 TA02
1M 2M
fSAMPLE = 400kHz
NYQUIST
FREQUENCY
Figure 2a. LTC1416 Nonaveraged, 4096 Point FFT,
Input Frequency = 100kHz
Figure 2b. LTC1416 Nonaveraged, 4096 Point FFT,
Input Frequency = 190kHz
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