參數(shù)資料
型號(hào)： LTC2415-1CGN
廠商： LINEAR TECHNOLOGY CORP
元件分類： ADC
英文描述： 24-Bit No Latency ADCs with Differential Input and Differential Reference
中文描述： 1-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO16
封裝： 0.150 INCH, PLASTIC, SSOP-16
文件頁數(shù)： 32/40頁
文件大?。?/td> 605K
代理商： LTC2415-1CGN
LTC2415/LTC2415-1
32
sn2415 24151fs
APPLICATIU
W
U
U
FREQUENCY AT V
IN
(Hz)
1
–120
R
–100
–80
–60
–40
–20
0
50
100
150
200
2415 F30
250
V
CC
= 5V
V
REF
= 5V
V
IN
= 2.5V
F
O
= 0
INPUT FREQUENCY
0
–60
–40
0
2415 F31
–80
–100
f
S
/2
f
S
–120
–140
–20
R
INPUT FREQUENCY DEVIATION FROM NOTCH FREQUENCY (%)
–12
–8
–4
0
4
8
12
R
2415 F32
–60
–70
–80
–90
–100
–110
–120
–130
–140
48
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
50
52
54
56
58
60
62
N
2415 F33
–80
–90
–100
–100
–120
–130
–140
INPUT FREQUENCY (Hz)
0
20
40
60
80
100
120
140
160
180
200
220
N
2415 F34
0
–20
–40
–60
–80
–100
–120
V
CC
= 5V
REF
= 5V
REF
–
= GND
V
INCM
= 2.5V
V
IN(P-P)
= 5V
T
A
= 25
°
C
MEASURED DATA
CALCULATED DATA
Figure 34. Input Normal Mode Rejection vs Input
Frequency with Input Perturbation of 100% of Full Scale
Figure 30. Rejection vs Frequency at V
IN
Figure 31. Rejection vs Frequency at V
IN
Figure 32. Rejection vs Frequency at V
IN
Figure 33. Normal Mode Rejection
when Using an Internal Oscillator
Normal Mode Rejection, Output Rate and Running
Averages
The LTC2415/LTC2415-1 both contain an identical Sinc
4
digital filter (see Figures 30 and 31) which offers excellent
line frequency noise rejection. For the LTC2415, a notch
frequency of either 50Hz or 60Hz (see Figure 32) is user
selectable by tying pin F
O
high or Low, respectively. On the
other hand, the LTC2415-1 offers simultaneous rejection
of 50Hz and 60Hz by tying F
O
low. This sets the notch
frequency to approximately 55Hz (see Figure 32).
At a notch frequency of 55Hz, the LTC2415-1 rejects 50Hz
±
2% and 60Hz
±
2% better than 72dB. In order to achieve
better than 87dB rejection of both 50Hz and 60Hz
±
2%, a
running average can be performed. By averaging two
consecutive ADC readings, a Sinc
1
notch is combined with
the Sinc
4
digital filter yielding the frequency response
shown in Figures 33 and 34. In order to preserve the 2
×
output rate, adjacent results are averaged with the follow-
ing algorithm:
Result 1 = average (sample 0, sample 1)
Result 2 = average (sample 1, sample 2)
Result 3 = average (sample 2, sample 3)
…
Result N = average (sample n-1, sample n)
相關(guān)PDF資料
PDF描述
LTC2415-1IGN 24-Bit No Latency ADCs with Differential Input and Differential Reference
LTC2415CGN 24-Bit No Latency ADCs with Differential Input and Differential Reference
LTC2415IGN 24-Bit No Latency ADCs with Differential Input and Differential Reference
LTC2415 2-Channel Differential Input 24-Bit No Latency DS ADC
LTC2424 16-Bit 2.5-V to 3.3-V/3.3-V To 5-V Level Shifting Transceiver With 3-State Outputs 48-SSOP -40 to 85
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