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參數(shù)資料
| 型號： | LTC2410 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 20-Bit Universal Bus Driver With 3-State Outputs 56-SSOP -40 to 85 |
| 中文描述： | 24位無與差分輸入和差分ADC的參考延遲 |
| 文件頁數(shù)： | 28/44頁 |
| 文件大?。?/td> | 778K |
| 代理商： | LTC2410 |
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LTC2410
28
APPLICATIU
W
U
U
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 LTC2410 significantly
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
LTC2410’s autocalibration circuits further simplify the
antialiasing requirements by additional normal mode sig-
nal filtering both in the analog and digital domain. Inde-
pendent of the operating mode, f
S
= 256 f
N
= 2048
f
OUTMAX
where f
N
in the notch frequency and f
OUTMAX
is
the maximum output data rate. In the internal oscillator
mode with a 50Hz notch setting, f
S
= 12800Hz and with a
60Hz notch setting f
S
= 15360Hz. In the external oscillator
mode, f
S
= f
EOSC
/10.
The combined normal mode rejection performance is
shown in Figure36 for the internal oscillator with 50Hz
notch setting (F
O
= HIGH) and in Figure37 for the internal
oscillator with 60Hz notch setting (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 Figure38 (rejection near DC) and
Figure39 (rejection at f
S
= 256f
N
) where f
N
represents the
notch frequency. These curves have been derived for the
external oscillator mode but they can be used in all
operating modes by appropriately selecting the f
N
value.
The user can expect to achieve in practice this level of
performance using the internal oscillator as it is demon-
strated by Figures 40 and 41. Typical measured values of
the normal mode rejection of the LTC2410 operating with
an internal oscillator and a 60Hz notch setting are shown
in Figure 40 superimposed over the theoretical calculated
curve. Similarly, typical measured values of the normal
mode rejection of the LTC2410 operating with an internal
oscillator and a 50Hz notch setting are shown in Figure 41
superimposed over the theoretical calculated curve.
As a result of these remarkable normal mode specifica-
tions, minimal (if any) antialias filtering is required in front
of the LTC2410. If passive RC components are placed in
Figure 35. Input Signal Bandwidth Using the Internal Oscillator
Figure 36. Input Normal Mode Rejection,
Internal Oscillator and 50Hz Notch
Figure 37. Input Normal Mode Rejection, Internal
Oscillator and 60Hz Notch or External Oscillator
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
I
2410 F35
0.0
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
–4.0
–4.5
–5.0
–5.5
–6.0
F
O
= HIGH
F
O
= LOW
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
2410 F36
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
2410 F37
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
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