参数资料
型号: LTC1750IFW#PBF
厂商: Linear Technology
文件页数: 2/20页
文件大小: 0K
描述: IC ADC 14BIT 80MSPS SMPL 48TSSOP
标准包装: 39
位数: 14
采样率(每秒): 80M
数据接口: 并联
转换器数目: 1
功率耗散(最大): 1.69W
电压电源: 单电源
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 48-TFSOP(0.240",6.10mm 宽)
供应商设备封装: 48-TSSOP
包装: 管件
输入数目和类型: 2 个单端,双极;1 个差分,双极
10
LTC1750
1750f
TI I G DIAGRA
U
WW
APPLICATIO S I FOR ATIO
WU
UU
DYNAMIC PERFORMANCE
Signal-to-Noise Plus Distortion 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
frequency.
Signal-to-Noise Ratio
The signal-to-noise ratio (SNR) is the ratio between the
RMS amplitude of the fundamental input frequency and
the RMS amplitude of all other frequency components
except the first five harmonics and DC.
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
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. The THD calculated in this
data sheet uses all the harmonics up to the fifth.
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
frequency.
If two pure sine waves of frequencies fa and fb are applied
to the ADC input, nonlinearities in the ADC transfer func-
tion can create distortion products at the sum and differ-
ence frequencies of mfa
± nfb, where m and n = 0, 1, 2, 3,
etc. The 3rd order intermodulation products are 2fa + fb,
2fb + fa, 2fa – fb and 2fb – fa. The intermodulation
distortion is defined as the ratio of the RMS value of either
input tone to the RMS value of the largest 3rd order
intermodulation product.
1750 TD
t3
t7
t6
t4
t5
t10
t9
N
t2
t0
t1
t8
DATA (N – 5)
DB13 TO DB0
ANALOG
INPUT
ENC
DATA
CLKOUT
DATA (N – 4)
DB13 TO DB0
DATA (N – 3)
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