參數(shù)資料
型號(hào): LTC2413
廠商: Linear Technology Corporation
元件分類: ADC
英文描述: 2.7V to 5.5V Simultaneous 50Hz/60Hz Rejection Micropower Differential Σ△ Analog to Digital Converter(2.7V ~5.5V,微功耗,24位差分Σ△串行模數(shù)轉(zhuǎn)換器)
中文描述: 2.7V至5.5V同步50Hz/60Hz抑制微差分Σ△模數(shù)轉(zhuǎn)換器(2.7?5.5V的,微功耗,24位差分Σ△串行模數(shù)轉(zhuǎn)換器)
文件頁數(shù): 29/40頁
文件大?。?/td> 373K
代理商: LTC2413
LTC2413
29
APPLICATIU
W
U
U
Figure 38. Input Normal Mode Rejection
Figure 37. Input Normal Mode Rejection
Figure 39. Input Normal Mode Rejection
F
O
= LOW OR
F
O
= EXTERNAL OSCILLATOR,
f
EOSC
= 10 f
S
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0
f
S
I
2413 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
INPUT SIGNAL FREQUENCY (Hz)
I
2413 F38
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
INPUT SIGNAL FREQUENCY (Hz)
250f
N
252f
N
254f
N
256f
N
258f
N
260f
N
262f
N
I
2413 F39
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
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 LTC2413 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
LTC2413’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, f
S
= 13980Hz. In the external oscillator mode, f
S
=
f
EOSC
/10.
The combined normal mode rejection performance is
shown in Figure37. 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 exter-
nal oscillator mode but they can be used in all operating
modes by appropriately selecting the f
N
value.
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