参数资料
型号: DC1012A-A
厂商: Linear Technology
文件页数: 21/34页
文件大小: 0K
描述: BOARD DELTA SIGMA ADC LTC2499
软件下载: QuikEval System
设计资源: DC1012A Schematic
DC1012A Design File
标准包装: 1
系列: Easy Drive™, QuikEval™
ADC 的数量: 1
位数: 24
采样率(每秒): 7.5
数据接口: I²C,串行
已用 IC / 零件: LTC2499
已供物品:
相关产品: LTC2499CUHF#TRPBF-ND - IC ADC 24BIT DELTA SIG 38-QFN
LTC2499IUHF#TRPBF-ND - IC ADC 24BIT DELTA SIG 38-QFN
LTC2499IUHF#PBF-ND - IC ADC 24BIT DELTA SIG 38-QFN
LTC2499CUHF#PBF-ND - IC ADC 24BIT DELTA SIG 38-QFN
LTC2499
2499fd
Figure 21. Input Normal Mode Rejection at fS = 256 fN
Figure 20. Input Normal Mode Rejection at DC
When using the internal oscillator, the LTC2499 is de-
signed to reject line frequencies. As shown in Figure 20,
rejection 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 21); 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 22, 23,
and 24. Measured values of normal mode rejection are
shown superimposed over the theoretical values in all
three rejection modes.
applications inForMation
Traditional high order delta-sigma modulators suffer from
potential instabilities at large input signal levels. The
proprietary architecture used for the LTC2499 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
severalvoltsifpeak-to-peaknoise.Figures25and26show
measurement results for the rejection of a 7.5V peak-
to-peak noise source (150% of full scale) applied to the
LTC2499.Thesecurvesshowthattherejectionperformance
is maintained even in extremely noisy environments.
INPUT SIGNAL FREQUENCY (Hz)
INPUT
NORMAL
MODE
REJECTION
(dB)
2499 F20
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)
2499 F21
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
fN = fEOSC/5120
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