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參數(shù)資料
| 型號： | LTC1278-4CSW |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 12-Bit, 500ksps Sampling A/D Converter with Shutdown |
| 中文描述： | 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDSO24 |
| 封裝： | 0.300 INCH, PLASTIC, SO-24 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大小： | 329K |
| 代理商： | LTC1278-4CSW |
10
LTC1278
APPLICATIO
S I
FOR
ATIO
U
frequency is shown in Figure 4. The LTC1278 has good
distortion performance up to the Nyquist frequency and
beyond.
W
U
U
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) = 20logAmplitude at (fa ± fb)
Amplitude at fa
Figure 5 shows the IMD performance at a 100kHz input.
FREQUENCY (Hz)
0
–120
A
–100
–80
–60
–40
–20
0
50k
100k
150k
200k
LTC1278 G8
250k
f
SAMPLE
= 500kHz
f
IN1
= 96.80kHz
f
IN2
= 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
A
–80
–60
–40
–20
100k
2M
1M
LT1278 G6
–90
–70
–50
–30
–10
0
f
SAMPLE
= 500kHz
3RD HARMONIC
THD
2ND HARMONIC
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