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LTC2440IGN Arkusz danych(PDF) 20 Page - Linear Technology

Numer części LTC2440IGN
Szczegółowy opis  24-Bit High Speed Differential delta-sigma ADC with Selectable Speed/Resolution
PDF  28 Pages
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Producent  LINER [Linear Technology]
Strona internetowa  http://www.linear.com
Logo LINER - Linear Technology

LTC2440IGN Arkusz danych(HTML) 20 Page - Linear Technology

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LTC2440
20
sn2440, 2440fas
APPLICATIO S I FOR ATIO
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
47
–140
–130
–120
–110
–100
51
55
59
63
2440 F12
–90
–80
49
53
57
61
Figure 12. LTC2440 Normal Mode Rejection (Internal Oscillator)
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
the noise performance of the device is 200nVRMS with
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 first multiple of fS occurs at 55Hz • 32,768 =
1.8MHz, see Figure 13.
The first 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 first multiple of fS.
Figure 13. LTC2440 Normal Mode Rejection (Internal Oscillator)
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0
–60
–40
0
1440 F13
–80
–100
1000000
2000000
–120
1.8MHz
–140
–20
REJECTION > 120dB



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