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参数资料
| 型号： | LTC1278-5ISW#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 2/16页 |
| 文件大小： | 0K |
| 描述： | IC A/DCONV SAMPLNG W/SHTDN24SOIC |
| 标准包装： | 32 |
| 位数： | 12 |
| 采样率（每秒）： | 500k |
| 数据接口： | 并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 150mW |
| 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： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC |
| 包装： | 管件 |
| 输入数目和类型： | 1 个单端，单极；1 个单端，双极 |
10
LTC1278
APPLICATIONS INFORMATION
WU
U
frequency is shown in Figure 4. The LTC1278 has good
distortion performance up to the Nyquist frequency and
beyond.
Figure 4. Distortion vs Input Frequency
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 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) and
(fa – fb) while the 3rd order IMD terms include (2fa + fb),
(2fa – fb), (fa + 2fb), and (fa – 2fb). 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
Figure 5 shows the IMD performance at a 100kHz input.
FREQUENCY (Hz)
0
–120
AMPLITUDE
(dB)
–100
–80
–60
–40
–20
0
50k
100k
150k
200k
LTC1278 G8
250k
fSAMPLE = 500kHz
fIN1 = 96.80kHz
fIN2 = 101.68kHz
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 re-
duced 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 68dB (11 effective bits). The
LTC1278 has been designed to optimize input bandwidth,
allowing ADC to undersample input signals with frequen-
cies above the converter’s Nyquist Frequency. The noise
floor stays very low at high frequencies; S/(N + D) be-
comes dominated by distortion at frequencies far beyond
Nyquist.
Driving the Analog Input
The analog input of the LTC1278 is easy to drive. It draws
only one small current spike while charging the sample-
and-hold capacitor at the end of conversion. During con-
version the analog input draws no current. The only
requirement is that the amplifier driving the analog input
must settle after the small current spike before the next
Figure 5. Intermodulation Distortion Plot
INPUT FREQUENCY (Hz)
10k
–100
AMPLITUDE
(dB
BELOW
THE
FUNDAMENTAL)
–80
–60
–40
–20
100k
2M
1M
LT1278 G6
–90
–70
–50
–30
–10
0
fSAMPLE = 500kHz
3RD HARMONIC
THD
2ND HARMONIC
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