参数资料
型号: LTC2413IGN
厂商: Linear Technology
文件页数: 27/44页
文件大小: 0K
描述: IC A/D CONV 24BIT MICRPWR 16SSOP
标准包装: 100
位数: 24
采样率(每秒): 6.8
数据接口: MICROWIRE?,串行,SPI?
转换器数目: 2
功率耗散(最大): 1mW
电压电源: 单电源
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 16-SSOP(0.154",3.90mm 宽)
供应商设备封装: 16-SSOP
包装: 管件
输入数目和类型: 1 个差分,双极
LTC2413
33
sn2413 2413fs
APPLICATIO S I FOR ATIO
WU
U
Figure 39. Input Normal Mode Rejection
Figure 38. Input Normal Mode Rejection
Figure 40. Input Normal Mode Rejection
FO = LOW OR
FO = EXTERNAL OSCILLATOR,
fEOSC = 10 fS
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0fS
INPUT
NORMAL
MODE
REJECTION
(dB)
2413 F38
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
2fS 3fS 4fS 5fS 6fS 7fS 8fS 9fS 10fS
INPUT SIGNAL FREQUENCY (Hz)
INPUT
NORMAL
MODE
REJECTION
(dB)
2413 F39
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
fN
0
2fN 3fN 4fN 5fN 6fN 7fN 8fN
INPUT SIGNAL FREQUENCY (Hz)
250fN 252fN 254fN 256fN 258fN 260fN 262fN
INPUT
NORMAL
MODE
REJECTION
(dB)
2413 F40
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 sinc4 digital filter provides greater than 120dB normal
mode rejection at all frequencies except DC and integer
multiples of the modulator sampling frequency (fS). 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, fS = 256 fN = 2048
fOUTMAX where fN in the notch frequency and fOUTMAX is
the maximum output data rate. In the internal oscillator
mode, fS = 13980Hz. In the external oscillator mode, fS =
fEOSC/10.
The combined normal mode rejection performance is
shown in Figure 38. The regions of low rejection occurring
at integer multiples of fS have a very narrow bandwidth.
Magnified details of the normal mode rejection curves are
shown in Figure 39 (rejection near DC) and Figure 40
(rejection at fS = 256fN) where fN 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 fN value.
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