参数资料
型号: LTC1417IGN#PBF
厂商: Linear Technology
文件页数: 2/32页
文件大小: 0K
描述: IC A/D CONV 14BIT SAMPLNG 16SSOP
标准包装: 100
位数: 14
采样率(每秒): 400k
数据接口: MICROWIRE?,串行,SPI?
转换器数目: 1
功率耗散(最大): 27.5mW Unipolar; 44mW Bipolar
电压电源: 双 ±
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 16-SSOP(0.154",3.90mm 宽)
供应商设备封装: 16-SSOP
包装: 管件
输入数目和类型: 2 个单端,单极;2 个单端,双极;1 个差分,单极;1 个差分,双极
产品目录页面: 1346 (CN2011-ZH PDF)
10
LTC1417
sn1417 1417fas
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 3b shows a typical spectral content with
a 400kHz sampling rate and a 200kHz input. The dynamic
performance is excellent for input frequencies up to and
beyond the Nyquist limit of 200kHz.
Figure 4. Effective Bits and Signal/(Noise + Distortion)
vs Input Frequency
APPLICATIONS INFORMATION
WU
U
Figure 3a. LTC1417 Nonaveraged, 4096 Point FFT,
Input Frequency = 10kHz
Figure 3b. LTC1417 Nonaveraged, 4096 Point FFT,
Input Frequency = 200kHz
FREQUENCY (kHz)
0
100
50
AMPLITUDE
(dB)
0
–20
–40
–60
–80
–100
–120
150
1417 G07
200
fSAMPLE = 400kHz
fIN = 10.05859375kHz
SFDR = –97.44dB
SINAD = 81.71dB
FREQUENCY (kHz)
0
50
100
AMPLITUDE
(dB)
0
–20
–40
–60
–80
–100
–120
150
1417 G08
200
fSAMPLE = 400kHz
fIN = 197.949188kHz
SFDR = –98dB
SINAD = 81.1dB
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 (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 400kHz, the LTC1417 maintains near ideal ENOBs
up to the Nyquist input frequency of 200kHz (refer to
Figure 4).
INPUT FREQUENCY (Hz)
4
EFFECTIVE
BITS
S/(N
+
D)
(dB)
6
8
10
12
10k
100k
1M
1417 TA02
2
1k
14
86
80
74
68
62
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
VVV
Vn
V
=
++
+
20
23
4
1
22
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 5. The LTC1417 has good distortion
performance up to the Nyquist frequency and beyond.
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