- 您现在的位置：买卖IC网 > PDF目录10353 > LTC2481IDD#TRPBF (Linear Technology)IC ADC 16BIT I2C 10-DFN PDF资料下载
参数资料
| 型号： | LTC2481IDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 27/40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 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页当前第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页
LTC2481
33
2481fc
APPLICATIONS INFORMATION
Using the 2x speed mode of the LTC2481, the device
bypasses the digital offset calibration operation to double
the output data rate. The superior normal mode rejection
is maintained as shown in Figures 31 and 32. However,
the magnied details near DC and fS = 256fN are different,
see Figures 40 and 41. In 2x speed mode, the bandwidth is
11.4Hz for the 50Hz rejection mode, 13.6Hz for the 60Hz
rejection mode and 12.4Hz for the 50Hz/60Hz rejection
mode. Typical measured values of the normal mode rejec-
tion of the LTC2481 operating with the internal oscillator
and 2x speed mode is shown in Figure 42.
When the LTC2481 is congured in 2x speed mode, by
performing a running average, a SINC1 notch is combined
with the SINC4 digital lter, yielding the normal mode
rejection identical as that for the 1x speed mode. The
averaging operation still keeps the output rate with the
following algorithm:
Result 1 = average (sample 0, sample 1)
Result 2 = average (sample 1, sample 2)
……
Result n = average (sample n – 1, sample n)
The main advantage of the running average is that it
achieves simultaneous 50Hz/60Hz rejection at twice the
effective output rate, as shown in Figure 43. The raw output
data provides a better than 70dB rejection over 48Hz to
62.4Hz, which covers both 50Hz ±2% and 60Hz ±2%. With
running average on, the rejection is better than 87dB for
both 50Hz ±2% and 60Hz ±2%.
Complete Thermocouple Measurement System with
Cold Junction Compensation
The LTC2481 is ideal for direct digitization of thermo-
couples and other low voltage output sensors. The input
has a typical offset error of 500nV (2.5μV max) offset
drift of 10nV/°C and a noise level of 600nVRMS. The input
span may be optimized for various sensors by setting the
gain of the PGA. Using an external 5V reference with a
PGA gain of 64 gives a ±78mV input range—perfect for
thermocouples.
Figure 45 (page 39 of this data sheet) is a complete type
K thermocouple meter. The only signal conditioning is a
simple surge protection network. In any thermocouple
meter, the cold junction temperature sensor must be at
the same temperature as the junction between the ther-
mocouple materials and the copper printed circuit board
traces. The tiny LTC2481 can be tucked neatly underneath
an Omega MPJ-K-F thermocouple socket ensuring close
thermal coupling.
The LTC2481’s 1.4mV/°C PTAT circuit measures the cold
junction temperature. Once the thermocouple voltage
and cold junction temperature are known, there are
many ways of calculating the thermocouple temperature
including a straight-line approximation, lookup tables or a
polynomial curve t. Calibration is performed by applying
an accurate 500mV to the ADC input derived from an
LT1236 reference and measuring the local temperature
with an accurate thermometer as shown in Figure 44. In
calibration mode, the up and down buttons are used to
adjust the local temperature reading until it matches an
accurate thermometer. Both the voltage and temperature
calibration are easily automated.
The complete microcontroller code for this application is
available on the LTC2481 product webpage at:
http://www.linear.com
It can be used as a template for may different instruments
and it illustrates how to generate calibration coefcients
for the onboard temperature sensor. Extensive comments
detail the operation of the program. The read_LTC2481()
function controls the operation of the LTC2481 and is
listed below for reference.
相关PDF资料 |
PDF描述 |
|---|---|
| MAX98300ETA+T | IC AMP MONO CLASS D 2A 8TDFN |
| D38999/20JB98SALC | CONN HSG RCPT 6POS WALL MT SCKT |
| MAX9700CETB+T | IC AMP AUDIO 1.6W MONO D 10TDFN |
| D38999/20WH21SNLC | CONN HSG RCPT 21POS WALL MT SCKT |
| VE-JTR-MX | CONVERTER MOD DC/DC 7.5V 75W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
发布紧急采购，3分钟左右您将得到回复。