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参数资料
| 型号： | LTC2411CMS |
| 英文描述： | Analog-to-Digital Converter， 24-Bit |
| 中文描述： | 模拟到数字转换器，24比特 |
| 文件页数： | 22/40页 |
| 文件大小： | 450K |
| 代理商： | LTC2411CMS |
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LTC2411
29
Input Bandwidth
The combined effect of the internal Sinc4 digital filter and
of the analog and digital autocalibration circuits deter-
mines the LTC2411 input bandwidth. When the internal
oscillator is used with the notch set at 60Hz (FO = LOW),
the 3dB input bandwidth is 3.63Hz. When the internal
oscillator is used with the notch set at 50Hz (FO = HIGH),
the 3dB input bandwidth is 3.02Hz. If an external conver-
sion clock generator of frequency fEOSC is connected to the
FO pin, the 3dB input bandwidth is 0.236 10–6 fEOSC.
Due to the complex filtering and calibration algorithms
utilized, the converter input bandwidth is not modeled very
accurately by a first order filter with the pole located at the
3dB frequency. When the internal oscillator is used, the
shape of the LTC2411 input bandwidth is shown in Fig-
ure 28 for FO = LOW and FO = HIGH. When an external
oscillator of frequency fEOSC is used, the shape of the
LTC2411 input bandwidth can be derived from Figure 28,
FO = LOW curve in which the horizontal axis is scaled by
fEOSC/153600.
The conversion noise (1.45
VRMS typical for VREF = 5V)
can be modeled by a white noise source connected to a
noise free converter. The noise spectral density is 70nV/
√Hz
for an infinite bandwidth source and 126nV/
√Hz for a
single 0.5MHz pole source. From these numbers, it is clear
that particular attention must be given to the design of
external amplification circuits. Such circuits face the si-
multaneous requirements of very low bandwidth (just a
few Hz) in order to reduce the output referred noise and
relatively high bandwidth (at least 500kHz) necessary to
drive the input switched-capacitor network. A possible
solution is a high gain, low bandwidth amplifier stage
followed by a high bandwidth unity-gain buffer.
When external amplifiers are driving the LTC2411, the
ADC input referred system noise calculation can be simpli-
fied by Figure 29. The noise of an amplifier driving the
LTC2411 input pin can be modeled as a band limited white
noise source. Its bandwidth can be approximated by the
bandwidth of a single pole lowpass filter with a corner
frequency fi. The amplifier noise spectral density is ni.
From Figure 29, using fi as the x-axis selector, we can find
APPLICATIO S I FOR ATIO
WU
UU
Figure 27. Resolution (INLMAX ≤ 1LSB)
vs Output Data Rate and Reference Voltage
OUTPUT DATA RATE (READINGS/SEC)
10
RESOLUTION
(BITS)
14
18
22
12
16
20
40
60
80
2411 F27
100
10
030
50
70
90
VCC = 5V
REF– = GND
VINCM = 2.5V
VIN = 0V
FO = EXT OSC
RES = LOG2(VREF/INLMAX)
TA = 25°C
VREF = 5V
VREF = 2.5V
Figure 28. Input Signal Bandwidth
Using the Internal Oscillator
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
INPUT
SIGNAL
ATTENUATION
(dB)
2411 F28
0.0
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
–4.0
–4.5
–5.0
–5.5
–6.0
FO = HIGH
FO = LOW
INPUT NOISE SOURCE SINGLE POLE
EQUIVALENT BANDWIDTH (Hz)
1
INPUT
REFERRED
NOISE
EQUIVALENT
BANDWIDTH
(Hz)
10
100
1000
10
100
1k
10k 100k
1M
2411 G29
0.1
1
FO = LOW
FO = HIGH
Figure 29. Input Referred Noise Equivalent Bandwidth
of an Input Connected White Noise Source
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相关代理商/技术参数 |
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| LTC2411CMS#PBF | 功能描述:IC A/D CONV 24BIT MICRPWR 10MSOP 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 |
| LTC2411CMS#TR | 功能描述:IC A/D CONV 24BIT MICRPWR 10MSOP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
| LTC2411CMS#TRPBF | 功能描述:IC A/D CONV 24BIT MICRPWR 10MSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
| LTC2411IMS | 功能描述:IC A/D CONV 24BIT MICRPWR 10MSOP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
| LTC2411IMS#PBF | 功能描述:IC A/D CONV 24BIT MICRPWR 10MSOP 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 |
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