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| 型号： | LTC2481IDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 24/40页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT I2C 10-DFN |
| 标准包装： | 2,500 |
| 位数： | 16 |
| 采样率（每秒）： | 7.5 |
| 数据接口： | I²C，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 480µW |
| 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： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-DFN（3x3） |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 2 个单端，双极；1 个差分，双极 |
| 配用： | DC951A-ND - BOARD DELTA SIGMA ADC LTC2481 |
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LTC2481
30
2481fc
APPLICATIONS INFORMATION
In 1x speed mode, the regions of low rejection occurring
at integer multiples of fS have a very narrow bandwidth.
Magnied details of the normal mode rejection curves
are shown in Figure 33 (rejection near DC) and Figure 34
(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.
The user can expect to achieve this level of performance
using the internal oscillator as it is demonstrated by
Figures 35, 36 and 37. Typical measured values of the
normal mode rejection of the LTC2481 operating with an
internal oscillator and a 60Hz notch setting are shown in
Figure 35 superimposed over the theoretical calculated
curve. Similarly, the measured normal mode rejection of
the LTC2481 for the 50Hz rejection mode and 50Hz/60Hz
rejection mode are shown in Figures 36 and 37.
As a result of these remarkable normal mode specica-
tions, minimal (if any) antialias ltering is required in front
of the LTC2481. If passive RC components are placed in
front of the LTC2481, the input dynamic current should
be considered (see Input Current section). In this case,
the differential input current cancellation feature of the
LTC2481 allows external RC networks without signicant
degradation in DC performance.
Traditional high order delta-sigma modulators, while
providing very good linearity and resolution, suffer
from potential instabilities at large input signal levels.
The proprietary architecture used for the LTC2481 third
order modulator resolves this problem and guarantees a
predictable stable behavior at input signal levels of up to
150% of full-scale. In many industrial applications, it is
not uncommon to have to measure microvolt level signals
superimposed on volt level perturbations and the LTC2481
is eminently suited for such tasks. When the perturbation
is differential, the specication of interest is the normal
mode rejection for large input signal levels. With a refer-
ence voltage VREF = 5V, the LTC2481 has a full-scale dif-
ferential input range of 5V peak-to-peak. Figures 38 and
39 show measurement results for the LTC2481 normal
mode rejection ratio with a 7.5V peak-to-peak (150% of
full scale) input signal superimposed over the more tradi-
tional normal mode rejection ratio results obtained with a
5V peak-to-peak (full-scale) input signal. In Figure 38, the
LTC2481 uses the internal oscillator with the notch set at
60Hz and in Figure 39 it uses the internal oscillator with
the notch set at 50Hz. It is clear that the LTC2481 rejection
performance is maintained with no compromises in this
extreme situation. When operating with large input signal
levels, the user must observe that such signals do not
violate the device absolute maximum ratings.
Figure 33. Input Normal Mode Rejection at DC
Figure 34. Input Normal Mode Rejection at fs = 256fN
INPUT SIGNAL FREQUENCY (Hz)
INPUT
NORMAL
MODE
REJECTION
(dB)
2481 F33
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
fN
0
2fN 3fN 4fN 5fN 6fN 7fN 8fN
fN = fEOSC/5120
INPUT SIGNAL FREQUENCY (Hz)
250fN 252fN 254fN 256fN 258fN 260fN 262fN
INPUT
NORMAL
MODE
REJECTION
(dB)
2481 F34
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
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相关代理商/技术参数 |
参数描述 |
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| LTC2482CDD | 制造商:Linear Technology 功能描述:ADC Single Delta-Sigma 6.8sps 16-bit Serial 10-Pin DFN EP |
| LTC2482CDD#PBF | 功能描述:IC ADC 16BIT 10-DFN RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1 系列:microPOWER™ 位数:8 采样率（每秒）:1M 数据接口:串行，SPI? 转换器数目:1 功率耗散（最大）:- 电压电源:模拟和数字 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:24-VFQFN 裸露焊盘 供应商设备封装:24-VQFN 裸露焊盘（4x4） 包装:Digi-Reel® 输入数目和类型:8 个单端，单极 产品目录页面:892 (CN2011-ZH PDF) 其它名称:296-25851-6 |
| LTC2482CDD#TR | 制造商:Linear Technology 功能描述:ADC Single Delta-Sigma 6.8sps 16-bit Serial 10-Pin DFN EP T/R |
| LTC2482CDD#TRPBF | 功能描述:IC ADC 16BIT 10-DFN RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:2,500 系列:- 位数:16 采样率（每秒）:15 数据接口:MICROWIRE?，串行，SPI? 转换器数目:1 功率耗散（最大）:480µW 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:38-WFQFN 裸露焊盘 供应商设备封装:38-QFN（5x7） 包装:带卷 (TR) 输入数目和类型:16 个单端，双极；8 个差分，双极 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494 |
| LTC2482IDD | 制造商:Linear Technology 功能描述:ADC Single Delta-Sigma 6.8sps 16-bit Serial 10-Pin DFN EP |
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