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參數(shù)資料
| 型號(hào)： | LTC2435-1 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 20-Bit No Latency ADCs with Differential Input and Differential Reference |
| 中文描述： | 20位無(wú)與差分輸入和差分ADC的參考延遲 |
| 文件頁(yè)數(shù)： | 32/40頁(yè) |
| 文件大?。?/td> | 463K |
| 代理商： | LTC2435-1 |
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LTC2435/LTC2435-1
32
24351fa
Figure 34a. Input Normal Mode Rejection,
Internal Oscillator and 50Hz Notch (LTC2435)
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 LTC2435/LTC2435-1 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
). Inde-
pendent of the operating mode, f
S
= 256 f
N
= 1024
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 LTC2435, F
S
= 12800Hz with a 50Hz notch setting
and f
S
= 15360Hz with a 60Hz notch setting. For the
LTC2435-1, f
S
= 13980Hz (F
O
= LOW). In the external
oscillator mode, f
S
= f
EOSC
/10.
The normal mode rejection performance is shown in
Figure 34. 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 Figure 35 (rejection near DC) and Figure 36
(rejection at f
S
= 256f
N
) where f
N
represents the notch
frequency. For the LTC2435, the bandwidth is 13.6Hz
(F
O
= GND) and 11.4Hz (F
O
= V
CC
). The Bandwidth is
12.4Hz for the LTC2435-1 (F
O
= GND).
Through F
O
connection, the LTC2435 provides better than
110dB input differential mode rejection at 50Hz or 60Hz
±
2%. While for the LTC2435-1, it has a notch frequency of
about 55Hz with better than 70db rejection over 48Hz to
62.4Hz, which covers both 50Hz
±
2% and 60Hz
±
2%. In
order to achieve better rejection over the range of 48Hz to
62.4Hz, a running average can be performed. By averaging
two consecutive LTC2435-1 readings, a sinc
1
notch is
combined with the sinc
4
digital filter, yielding the fre-
quency response shown in Figure 37. The averaging
operation still keeps the output rate with the following
algorithm:
Result 1 = average (sample 0, sample 1)
Result 2 = average (sample 1, sample 2)
Result n = average (sample n-1, sample n)
The user can expect to achieve in practice this level of
performance using the internal oscillator as it is demon-
strated by Figures 38 to 40. Typical measured values of the
normal mode rejection of the LTC2435-1 operating with an
internal oscillator and a 54.6Hz notch setting are shown in
Figure 38 and 39 superimposed over the theoretical calcu-
lated curve. The same normal mode rejection perfor-
mance is obtained for the LTC2435 with the frequency
scaled to have the notch frequency at 60Hz (F
O
= GND) or
50Hz (F
O
= V
CC
).
APPLICATIU
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
2435 F34a
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
F
O
= HIGH
INPUT FREQUENCY
0
–60
–40
0
2435 F34b
–80
–100
f
S
/2
f
S
–120
–140
–20
R
Figure 34b. Input Normal Mode Rejection, Internal
Oscillator and FO = Low or External Oscillator
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