參數(shù)資料
型號: LTC1603IG#PBF
廠商: Linear Technology
文件頁數(shù): 10/20頁
文件大?。?/td> 0K
描述: IC ADC W/SHUTDOWN 16BIT 36-SSOP
標準包裝: 37
位數(shù): 16
采樣率(每秒): 250k
數(shù)據(jù)接口: 并聯(lián)
轉換器數(shù)目: 1
功率耗散(最大): 350mW
電壓電源: 模擬和數(shù)字,雙 ±
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 36-SSOP(0.209",5.30mm 寬)
供應商設備封裝: 36-SSOP
包裝: 管件
輸入數(shù)目和類型: 2 個單端,雙極;1 個差分,雙極
18
LTC1603
1603f
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,
APPLICATIONS INFORMATION
WU
U
etc. For example, the 2nd order IMD terms include
(fa – fb). If the two input sine waves are equal in magni-
tude, the value (in decibels) of the 2nd order IMD products
can be expressed by the following formula:
IMD fa
fb
Log
Amplitude
±
()=
±
20
at (fa
fb)
Amplitude at fa
Peak Harmonic or Spurious Noise
The peak harmonic or spurious noise is the largest spec-
tral 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 LTC1603 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.
Figure 21. Intermodulation Distortion Plot
FREQUENCY (kHz)
020
AMPLITUDE
(dB)
80
100
0
–20
–40
–60
–80
–100
–120
–140
1603 F21
40
60
120
fSAMPLE = 250kHz
fIN1 = 29.3kHz
fIN2 = 32.4kHz
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