Table 6. OSR vs Notch Frequency (fN
參數(shù)資料
型號： DC979A
廠商： Linear Technology
文件頁數(shù)： 15/32頁
文件大?。?/td> 0K
描述： BOARD DELTA SIGMA ADC LTC2442
軟件下載： QuikEval System
設(shè)計(jì)資源： DC979A Design File
DC979A Schematic
標(biāo)準(zhǔn)包裝： 1
系列： QuikEval™
ADC 的數(shù)量： 1
位數(shù)： 24
采樣率（每秒）： 8k
數(shù)據(jù)接口： MICROWIRE?，串行，SPI?
工作溫度： 0°C ~ 70°C
已用 IC / 零件： LTC2442
已供物品： 板
相關(guān)產(chǎn)品： LTC2442IG#TRPBF-ND - IC ADC 24BIT 250MSPS 36-SSOP
LTC2442CG#TRPBF-ND - IC ADC 24BIT 250MSPS 36-SSOP
LTC2442IG#PBF-ND - IC ADC 24BIT 4CH 36-SSOP
LTC2442CG#PBF-ND - IC ADC 24BIT 4CH 36-SSOP
LTC2442
22
2442fa
For more information www.linear.com/LTC2442
Table 6. OSR vs Notch Frequency (fN) (with Internal Oscillator
Running at 9MHz)
OSR
NOTCH (fN)
64
28.13kHz
128
14.06kHz
256
7.03kHz
512
3.52kHz
1024
1.76kHz
2048
879Hz
4096
439Hz
8192
220Hz
16384
110Hz
32768*
55Hz
* Simultaneous 50/60Hz rejection
Normal Mode Rejection and Antialiasing
One of the advantages delta-sigma ADCs offer over con-
ventional ADCs is on-chip digital filtering. Combined with
a large oversampling ratio, the LTC2442 significantly
simplifies antialiasing filter requirements.
The LTC2442’s speed/resolution is determined by the
oversample ratio (OSR) of the on-chip digital filter. The
OSR ranges from 64 for 3.5kHz output rate to 32,768 for
6.9Hz (in No Latency mode) output rate. The value of OSR
and the sample rate fS determine the filter characteristics
of the device. The first NULL of the digital filter is at fN
and multiples of fN where fN = fS/OSR, see Figure 10 and
Table 6. The rejection at the frequency fN ±14% is better
than 80dB, see Figure 11.
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0
–60
–40
0
180
2442 F10
–80
–100
60
120
240
–120
–140
–20
NORMAL
MODE
REJECTION
(dB)
SINC4 ENVELOPE
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
47
–140
NORMAL
MODE
REJECTION
(dB)
–130
–120
–110
–100
51
55
59
63
2442 F11
–90
–80
49
53
57
61
Figure 10. Normal Mode Rejection (Internal Oscillator)
Figure 11. Normal Mode Rejection (Internal Oscillator)
applications inForMation
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