参数资料
型号: LTC1604CG#TRPBF
厂商: Linear Technology
文件页数: 10/20页
文件大小: 0K
描述: IC A/D CONV 16BIT SAMPLNG 36SSOP
标准包装: 2,000
位数: 16
采样率(每秒): 333k
数据接口: 并联
转换器数目: 1
功率耗散(最大): 350mW
电压电源: 双 ±
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 36-SSOP(0.209",5.30mm 宽)
供应商设备封装: 36-SSOP
包装: 带卷 (TR)
输入数目和类型: 2 个单端,双极;1 个差分,双极
LTC1604
18
1604fa
APPLICATIONS INFORMATION
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 function
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
Peak Harmonic or Spurious Noise
The peak harmonic or spurious noise is the largest spectral
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 the reconstructed fundamental is reduced
by 3dB for a full-scale input signal.
The full-linear bandwidth is the input frequency at which
the S/(N + D) has dropped to 84dB (13.66 effective bits).
The LTC1604 has been designed to optimize input band-
width, allowing the ADC to undersample input signals with
frequencies above the converter’s Nyquist Frequency. The
noise floor stays very low at high frequencies; S/(N + D)
becomes dominated by distortion at frequencies far
beyond Nyquist.
FREQUENCY (kHz)
020
AMPLITUDE
(dB)
80
100
0
–20
–40
–60
–80
–100
–120
–140
1604 G06
40
60
160
120 140
fSAMPLE = 333kHz
fIN1 = 29.3kHz
fIN2 = 32.4kHz
Figure 21. Intermodulation Distortion Plot
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