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參數(shù)資料
| 型號： | LTC1282ACSW |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 3V 140ksps 12-Bit Sampling A/D Converter with Reference |
| 中文描述： | 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDSO24 |
| 封裝： | 0.300 INCH, PLASTIC, SOP-24 |
| 文件頁數(shù)： | 12/24頁 |
| 文件大?。?/td> | 439K |
| 代理商： | LTC1282ACSW |
12
LTC1282
U
S
A
Intermodulation Distortion
O
PPLICATI
U
U
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 follow-
ing formula:
IMD (fa ± fb) = 20logAmplitude at (fa ± fb)
Amplitude at fa
Figure 5 shows the IMD performance at a 20kHz input.
FREQUENCY (kHz)
0
–120
A
–100
–80
–60
–40
20
40
60
80
LTC1282 F05
–20
0
10
30
50
70
f
SAMPLE
= 160kHz
f
IN1
= 19.0kHz
f
IN2
= 20.6kHz
V
DD
= 3V
UNIPOLAR
Figure 5. Intermodulation Distortion Plot
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
LTC1282 has been designed to optimize input bandwidth,
allowing the ADC to undersample input signals with fre-
quencies above the converter’s Nyquist Frequency.
Driving the Analog Input
The analog input of the LTC1282 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
conversion starts. Any op amp that settles in 1.14
μ
s to
small current transients will allow maximum speed opera-
tion. If slower op amps are used, more settling time can be
provided by increasing the time between conversions.
Suitable devices capable of driving the ADC’s A
IN
input
include the LT
1190/LT1191, LT1007, LT1220, LT1223
and LT1224 op amps.
The analog input tolerates source resistance very well.
Here again, the only requirement is that the analog input
must settle before the next conversion starts. For larger
source resistance, full accuracy can be obtained if more
time is allowed between conversions.
Internal Reference
The LTC1282 has an on-chip, temperature compensated,
curvature corrected, bandgap reference which is factory
trimmed to 1.20V. It is internally connected to the DAC and
is available at pin 2 to provide up to 0.3mA current to an
external load.
For minimum code transition noise the reference output
should be decoupled with a capacitor to filter wideband
noise from the reference (10
μ
F tantalum in parallel with a
0.1
μ
F ceramic).
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.
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