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參數(shù)資料
| 型號： | LTC2493IDETRPBF |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 24-Bit 2-/4-Channel ADC with Easy Drive Input Current Cancellation and I2C Interface |
| 中文描述： | 24位2-/4-Channel ADC，具有易于驅(qū)動的輸入電流取消和I2C接口 |
| 文件頁數(shù)： | 26/32頁 |
| 文件大?。?/td> | 588K |
| 代理商： | LTC2493IDETRPBF |
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LTC2493
2493fa
Figure 20. Input Normal Mode Rejection at f
S
= 256 f
N
Figure 19. Input Normal Mode Rejection at DC
When using the internal oscillator, the LTC2493 is designed
to reject line frequencies. As shown in Figure 19, rejec-
tion nulls occur at multiples of frequency f
N
, where f
N
is
determined by the input control bits FA and FB (f
N
= 50Hz
or 60Hz or 55Hz for simultaneous rejection). Multiples of
the modulator sampling rate (f
S
= f
N
256) only reject noise
to 15dB (see Figure 20); if noise sources are present at
these frequencies antialiasing will reduce their effects.
The user can expect to achieve this level of performance
using the internal oscillator, as shown in Figures 21, 22,
and 23. Measured values of normal mode rejection are
shown superimposed over the theoretical values in all
three rejection modes.
applicaTions inForMaTion
INPUT SIGNAL FREQUENCY (Hz)
I
2493 F19
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
f
N
0
2f
N
3f
N
4f
N
5f
N
6f
N
7f
N
8f
N
f
N
= f
EOSC/5120
INPUT SIGNAL FREQUENCY (Hz)
250f
N
252f
N
254f
N
256f
N
258f
N
260f
N
262f
N
I
2493 F20
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
f
N
= f
EOSC/5120
Traditional high order delta-sigma modulators suffer
from potential instabilities at large input signal levels.
The proprietary architecture used for the LTC2493 third
order modulator resolves this problem and guarantees
stability with input signals 150% of full scale. In many
industrial applications, it is not uncommon to have mi-
crovolt level signals superimposed over unwanted error
sources with several volts if peak-to-peak noise. Figures
24 and 25 show measurement results for the rejection
of a 7.5V peak-to-peak noise source (150% of full scale)
applied to the LTC2493. These curves show that the rejec-
tion performance is maintained even in extremely noisy
environments.
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