参数资料
型号: LTC2366CTS8#TRPBF
厂商: Linear Technology
文件页数: 5/24页
文件大小: 0K
描述: IC ADC 12BIT 3MSPS TSOT23-8
标准包装: 2,500
位数: 12
采样率(每秒): 3M
数据接口: MICROWIRE?,串行,SPI?
转换器数目: 1
功率耗散(最大): 14.4mW
电压电源: 单电源
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: SOT-23-8 薄型,TSOT-23-8
供应商设备封装: TSOT-23-8
包装: 带卷 (TR)
输入数目和类型: 1 个单端,单极
配用: DC1190A-A-ND - BOARD SAR ADC LTC2366
LTC2365/LTC2366
13
23656fb
For more information www.linear.com/LTC2365
applications inForMation
Figure 9b. LTC2366 Intermodulation Distortion Plot
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
totheADCinput,nonlinearitiesintheADCtransferfunction
can create distortion products at the sum and difference
frequencies of mfa ± nfb, where m and n = 0, 1, 2, 3, etc.
For example, the 2nd order IMD terms include (fa ± fb).
If the two input sine waves are equal in magnitude, the
value (in decibels) of the 2nd order IMD products can be
expressed by the following formula:
IMD(fa ± fb) = 20log
Amplitude at (fa ± fb)
Amplitude at fa
The LTC2365/LTC2366 have good IMD as shown in
Figure 9a and Figure 9b, respectively.
Peak Harmonic or Spurious Noise
Thepeakharmonicorspuriousnoiseisthelargestspectral
component excluding the input signal and DC. This value
is expressed in decibels relative to the RMS value of a
full-scale input signal.
Full-Power and Full-Linear Bandwidth
The full-power bandwidth is that input frequency at which
the amplitude of reconstructed fundamental is reduced by
3dB for full-scale input signal.
The full-linear bandwidth is the input frequency at which
the SINAD has dropped to 68dB (11 effective bits). The
LTC2365/LTC2366 have been designed to optimize input
bandwidth, allowing the ADC to undersample input sig-
nals with frequencies above the converter’s Nyquist Fre-
quency. The noise floor stays very low at high frequencies;
SINAD becomes dominated by distortion at frequencies
far beyond Nyquist.
Figure 9a. LTC2365 Intermodulation Distortion Plot
INPUT FREQUENCY (kHz)
0
–140
MAGNITUDE
(dB)
–120
–80
–60
–40
0
50
250
350
23656 F09a
–100
–20
200
450 500
100 150
300
400
VDD = 3V
fSMPL = 1Msps
fb = 396kHz
fb = 424kHz
IMD = –73.5dB
INPUT FREQUENCY (kHz)
0
–20
–40
–60
–80
–100
–120
–140
750
1250
23656 F09b
250
500
1000
1500
MAGNITUE
(dB)
VDD = 3V
fSMPL = 3Msps
fa = 935kHz
fb = 1.045kHz
IMD = –71.5dB
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