OSR, the noise performance of the device is 200nVRMS
參數(shù)資料
型號： DC570A
廠商： Linear Technology
文件頁數(shù)： 13/28頁
文件大小： 0K
描述： BOARD DELTA SIGMA ADC LTC2440
軟件下載： QuikEval System
設(shè)計資源： DC570A Design File
DC570A Schematic
標準包裝： 1
系列： QuikEval™
ADC 的數(shù)量： 2
位數(shù)： 24
采樣率（每秒）： 3.5k
數(shù)據(jù)接口： MICROWIRE?，串行，SPI?
工作溫度： 0°C ~ 70°C
已用 IC / 零件： LTC2440
已供物品： 板
相關(guān)產(chǎn)品： LTC2440CGN#TRPBF-ND - IC ADC DIFFER 24-BIT HS 16-SSOP
LTC2440IGN#TRPBF-ND - IC ADC DIFFER 24-BIT HS 16-SSOP
LTC2440IGN#PBF-ND - IC ADC DIFFER 24-BIT HS 16-SSOP
LTC2440CGN#PBF-ND - IC ADC DIFFER 24-BIT HS 16-SSOP
LTC2440IGN#TR-ND - IC CONV A/D 24-BIT DIFF 16-SSOP
LTC2440CGN#TR-ND - IC CONV A/D 24-BIT DIFF 16-SSOP
LTC2440IGN-ND - IC ADC DIFFER 24-BIT HS 16-SSOP
LTC2440CGN-ND - IC ADC DIFFER 24-BIT HS 16-SSOP
LTC2440
20
2440fd
APPLICATIONS INFORMATION
OSR, the noise performance of the device is 200nVRMSwith
better than 80dB rejection of 50Hz ±2% and 60Hz ±2%.
Since the OSR is large (32,768) the wide band rejection
is extremely large and the antialiasing requirements are
simple. The rst multiple of fS occurs at 55Hz 32,768 =
1.8MHz, see Figure 13.
The rst NULL becomes fN = 7.04kHz with an OSR of 256
(an output rate of 880Hz) and fO grounded. While the NULL
has shifted, the sample rate remains constant. As a result
of constant modulator sampling rate, the linearity, offset
and full-scale performance remains unchanged as does
the rst multiple of fS.
Figure 12. LTC2440 Normal Mode Rejection (Internal Oscillator)
Figure 13. LTC2440 Normal Mode Rejection (Internal Oscillator)
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
47
–140
NORMAL
MODE
REJECTION
(dB)
–130
–120
–110
–100
51
55
59
63
2440 F12
–90
–80
49
53
57
61
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0
–60
–40
0
1440 F13
–80
–100
1000000
2000000
–120
1.8MHz
–140
–20
NORMAL
MODE
REJECTION
(dB)
REJECTION > 120dB
Table 5. OSR vs Notch Frequency (fN) with Internal Oscillator
Running at 9MHz
OSR
NOTCH (fN)
64
28.16kHz
128
14.08kHz
256
7.04kHz
512
3.52kHz
1024
1.76kHz
2048
880Hz
4096
440Hz
8192
220Hz
16384
110Hz
32768*
55Hz
*Simultaneous 50/60 rejection
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