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參數資料
| 型號： | DC1010A-A |
| 廠商： | Linear Technology |
| 文件頁數： | 19/32頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD DELTA SIGMA ADC LTC2493 |
| 軟件下載： | QuikEval System |
| 設計資源： | DC1010A Design File DC1010A Schematic |
| 標準包裝： | 1 |
| 系列： | Easy Drive™, QuikEval™ |
| ADC 的數量： | 1 |
| 位數： | 24 |
| 采樣率（每秒）： | 15 |
| 數據接口： | I²C，串行 |
| 已用 IC / 零件： | LTC2493 |
| 已供物品： | 板 |
| 相關產品： | LTC2493IDE#TRPBF-ND - IC ADC 24BIT DELTA SIG 14-DFN LTC2493CDE#TRPBF-ND - IC ADC 24BIT DELTA SIG 14-DFN LTC2493CDE#PBF-ND - IC ADC 24BIT DELTA SIG 14-DFN LTC2493IDE#PBF-ND - IC ADC 24BIT DELTA SIG 14-DFN |
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LTC2493
26
2493fd
Figure 20. Input Normal Mode Rejection at fS = 256 fN
Figure 19. Input Normal Mode Rejection at DC
Whenusingtheinternaloscillator,theLTC2493isdesigned
to reject line frequencies. As shown in Figure 19, rejec-
tion nulls occur at multiples of frequency fN, where fN is
determined by the input control bits FA and FB (fN = 50Hz
or 60Hz or 55Hz for simultaneous rejection). Multiples
of the modulator sampling rate (fS = fN 256) only reject
noise to 15dB (see Figure 20); if noise sources are present
at these frequencies anti-aliasing 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)
INPUT
NORMAL
MODE
REJECTION
(dB)
2493 F19
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
fN
0
2fN 3fN 4fN 5fN 6fN 7fN 8fN
fN = fEOSC/5120
INPUT SIGNAL FREQUENCY (Hz)
250fN 252fN 254fN 256fN 258fN 260fN 262fN
INPUT
NORMAL
MODE
REJECTION
(dB)
2493 F20
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
fN = fEOSC/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 microvolt 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 rejection perfor-
manceismaintainedeveninextremelynoisyenvironments.
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