参数资料
型号: LTC2410IGN#PBF
厂商: Linear Technology
文件页数: 27/48页
文件大小: 0K
描述: IC ADC 24BIT DIFF INP/REF 16SSOP
标准包装: 100
位数: 24
采样率(每秒): 7.5
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
配用: DC575A-ND - BOARD DELTA SIGMA ADC LTC2410
LTC2410
33
APPLICATIO S I FOR ATIO
WU
U
Figure 39. Input Normal Mode Rejection
Figure 40. Input Normal Mode Rejection
Figure 41. Input Normal Mode Rejection vs Input Frequency
with Input Perturbation of 100% Full Scale (60Hz Notch)
Figure 42. Input Normal Mode Rejection vs Input Frequency
with Input Perturbation of 100% Full Scale (50Hz Notch)
INPUT SIGNAL FREQUENCY (Hz)
INPUT
NORMAL
MODE
REJECTION
(dB)
2410 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)
2410 F40
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
INPUT FREQUENCY (Hz)
0
15
30
45
60
75
90
105 120 135 150 165 180 195 210 225 240
NORMAL
MODE
REJECTION
(dB)
2410 F41
0
–20
–40
–60
–80
–100
–120
VCC = 5V
REF+ = 5V
REF = GND
VINCM = 2.5V
VIN(P-P) = 5V
FO = GND
TA = 25°C
MEASURED DATA
CALCULATED DATA
INPUT FREQUENCY (Hz)
0
12.5
25
37.5
50
62.5
75
87.5 100 112.5 125 137.5 150 162.5 175 187.5 200
NORMAL
MODE
REJECTION
(dB)
2410 F42
0
–20
–40
–60
–80
–100
–120
VCC = 5V
REF+ = 5V
REF = GND
VINCM = 2.5V
VIN(P-P) = 5V
FO = 5V
TA = 25°C
MEASURED DATA
CALCULATED DATA
The combined normal mode rejection performance is
shown in Figure 37 for the internal oscillator with 50Hz
notch setting (FO = HIGH) and in Figure 38 for the internal
oscillator with 60Hz notch setting (FO = LOW) and for the
external oscillator mode. 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
external oscillator mode but they can be used in all
operating modes by appropriately selecting the fN value.
The user can expect to achieve in practice this level of
performance using the internal oscillator as it is demon-
strated by Figures 41 and 42. 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 41 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 42
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
front of the LTC2410, the input dynamic current should be
considered (see Input Current section). In cases where
large effective RC time constants are used, an external
buffer amplifier may be required to minimize the effects of
dynamic input current.
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