參數(shù)資料
型號(hào)： LTC2480CDD
廠商： LINEAR TECHNOLOGY CORP
元件分類： ADC
英文描述： 16-Bit ADC with Easy Drive
中文描述： 1-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO10
封裝： 3 X 3 MM, PLASTIC, MO-229WEED-2, DFN-10
文件頁數(shù)： 34/40頁
文件大?。?/td> 535K
代理商： LTC2480CDD
34
LTC2480
2480f
APPLICATIU
The SINC
4
digital filter provides greater than 120dB nor-
mal mode rejection at all frequencies except DC and
integer multiples of the modulator sampling frequency
(f
S
). The LTC2480’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 with a 50Hz notch setting, f
S
=
12800Hz, with
50Hz/60Hz rejection, f
S
= 13960Hz and with a 60Hz notch
setting f
S
= 15360Hz. In the external oscillator mode, f
S
=
f
EOSC
/20. The performance of the normal mode rejection
is shown in Figures 30 and 31.
W
U
U
Figure 30. Input Normal Mode Rejection,
Internal Oscillator and 50Hz Notch Mode
Figure 31. Input Normal Mode Rejection, Internal
Oscillator and 60Hz Notch Mode or External Oscillator
In 1x speed 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 Figure 32 (rejection near DC) and Figure 33
(rejection at f
S
= 256f
N
) where f
N
represents the notch
frequency. These curves have been derived for the exter-
nal oscillator mode but they can be used in all operating
modes by appropriately selecting the f
N
value.
The user can expect to achieve this level of performance
using the internal oscillator as it is demonstrated by Fig-
ures 34, 35 and 36. Typical measured values of the normal
mode rejection of the LTC2480 operating with an internal
oscillator and a 60Hz notch setting are shown in Figure 34
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
2480 F30
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0
f
S
I
2480 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 32. Input Normal Mode Rejection at DC
Figure 33. Input Normal Mode Rejection at f
S
= 256f
N
INPUT SIGNAL FREQUENCY (Hz)
I
2480 F32
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
f
N
0
2f
N
3f
N
4f
N
5f
N
6f
N
7f
N
8f
N
f
N
= f
EOSC/5120
INPUT SIGNAL FREQUENCY (Hz)
250f
N
252f
N
254f
N
256f
N
258f
N
260f
N
262f
N
I
2480 F33
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
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