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| 型号： | LTC1417IGN#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/32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) |
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11
LTC1417
sn1417 1417fas
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. For example, 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
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 the input frequency at which
the amplitude of the reconstructed fundamental is
reduced by 3dB from a full-scale input signal.
The full-linear bandwidth is the input frequency at which
the S/(N + D) has dropped to 77dB (12.5 effective bits).
The LTC1417 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.
DRIVING THE ANALOG INPUT
The differential analog inputs of the LTC1417 are easy to
drive. The inputs may be driven differentially or as a single-
ended input (i.e., the AIN– input is grounded). The AIN+ and
AIN– inputs are sampled at the same instant. Any
unwanted signal that is common to both inputs will be
reduced by the common mode rejection of the sample-
and-hold circuit. The inputs draw only one small current
spike while charging the sample-and-hold capacitors at
the end of conversion. During conversion, the analog
inputs draw only a small leakage current. If the source
impedance of the driving circuit is low, then the LTC1417
inputs can be driven directly. As source impedance
increases, so will acquisition time (see Figure 7). For
minimum acquisition time, with high source impedance, a
buffer amplifier must be used. The only requirement is that
the amplifier driving the analog input(s) must settle after
the small current spike before the next conversion starts —
500ns for full throughput rate.
APPLICATIONS INFORMATION
WU
U
Figure 5. Distortion vs Input Frequency
INPUT FREQUENCY (kHz)
1
–120
AMPLITUDE
(dB
BELOW
THE
FUNDAMENTAL)
–100
–80
–60
–40
0
10
100
THD
2ND
3RD
1417 G05
1000
–20
Figure 6. Intermodulation Distortion Plot
FREQUENCY (kHz)
0
–120
AMPLITUDE
(dB)
–100
–80
–60
–40
40
100
140
200
1417 G09
–20
0
20
60 80
120
160 180
fSAMPLE = 400kHz
fIN1 = 97.303466kHz
fIN2 = 104.632568kHz
VIN = 4.096VP-P
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