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參數(shù)資料
| 型號： | LTNS |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 24-Bit No Latency ADC with Differential Input and Reference in MSOP |
| 中文描述： | 24位不具有差動(dòng)輸入和ADC的參考延遲，采用MSOP |
| 文件頁數(shù)： | 30/40頁 |
| 文件大?。?/td> | 503K |
| 代理商： | LTNS |
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LTC2411/LTC2411-1
30
internal calibration and filtering. The noise of the driving
amplifier referred to the converter input and including all
these effects can be calculated as N= n
i
√
freq
i
. The total
system noise (referred to the LTC2411/LTC2411-1 input)
can now be obtained by summing as square root of sum
of squares the three ADC input referred noise sources: the
LTC2411/LTC2411-1 internal noise (1.45
μ
V), the noise of
the IN
+
driving amplifier and the noise of the IN
–
driving
amplifier.
If the F
O
pin is driven by an external oscillator of frequency
f
EOSC
, Figure 29 can still be used for noise calculation if the
x-axis is scaled by f
EOSC
/153600. For large values of the
ratio f
EOSC
/153600, the Figure 29 plot accuracy begins to
decrease, but in the same time the LTC2411/LTC2411-1
noise floor rises and the noise contribution of the driving
amplifiers lose significance.
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 LTC2411/LTC2411-1 sig-
nificantly simplifies antialiasing filter requirements.
The sinc
4
digital filter provides greater than 120dB normal
mode rejection at all frequencies except DC and integer
multiples of the modulator sampling frequency (f
S
). The
LTC2411/LTC2411-1’s autocalibration circuits further sim-
plify the antialiasing requirements by additional normal
mode signal filtering both in the analog and digital domain.
Independent of the operating mode, f
S
= 256 f
N
= 2048
f
OUTMAX
where f
N
is the notch frequency and f
OUTMAX
is
the maximum output data rate. In the internal oscillator
mode, for the LTC2411, F
S
= 12800Hz with a 50Hz notch
setting and f
S
= 15360Hz with a 60Hz notch setting. For the
LTC2411-1, f
S
= 13980Hz (F
O
= LOW). In the external
oscillator mode, f
S
= f
EOSC
/10.
The combined normal mode rejection performance is
shown in Figure30 for the internal oscillator with 50Hz
notch setting (F
O
= HIGH) and in Figure31 for the internal
oscillator with F
O
= LOW and for the external oscillator
mode. The regions of low rejection occurring at integer
multiples of f
S
have a very narrow bandwidth. Magnified
details of the normal mode rejection curves are shown in
APPLICATIOU
W
U
U
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0
f
S
2f
S
3f
S
4f
S
5f
S
6f
S
7f
S
8f
S
9f
S
10f
S
11f
S
12f
S
I
2411 F30
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
F
O
= HIGH
F
O
= LOW OR
F
O
= EXTERNAL OSCILLATOR,
f
EOSC
= 10 f
S
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0
f
S
I
2411 F31
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
2f
S
3f
S
4f
S
5f
S
6f
S
7f
S
8f
S
9f
S
10f
S
Figure 30. Input Normal Mode Rejection,
Internal Oscillator and 50Hz Notch (LTC2411)
Figure 31. Input Normal Mode Rejection, Internal
Oscillator and F
O
= LOW or External Oscillator
INPUT NOISE SOURCE SINGLE POLE
EQUIVALENT BANDWIDTH (Hz)
1
I
E
10
100
1000
10
100
1k
10k
100k
1M
2411 G29
0.1
0.1
1
F
O
= LOW
F
O
= HIGH
Figure 29. Input Referred Noise Equivalent Bandwidth
of an Input Connected White Noise Source
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