- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄377770 > LTC2440CGN (LINEAR TECHNOLOGY CORP) 24-Bit High Speed Differential delta-sigma ADC with Selectable Speed/Resolution PDF資料下載
參數(shù)資料
| 型號： | LTC2440CGN |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 24-Bit High Speed Differential delta-sigma ADC with Selectable Speed/Resolution |
| 中文描述： | 1-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SSOP-16 |
| 文件頁數(shù)： | 26/28頁 |
| 文件大?。?/td> | 316K |
| 代理商： | LTC2440CGN |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁當前第26頁第27頁第28頁
LTC2440
26
sn2440, 2440fas
APPLICATIU
W
U
U
Example:
If an amplifier (e.g. LT1219) driving the input of an
LTC2440 has wideband noise of 33nV/
√
Hz, band-limited
to 1.8MHz, the total noise entering the ADC input is:
33nV/
√
Hz
√
1.8MHz = 44.3
μ
V.
When the ADC digitizes the input, its digital filter filters out
the wideband noise from the input signal. The noise
reduction depends on the oversample ratio which defines
the effective bandwidth of the digital filter.
At an oversample of 256, the noise bandwidth of the ADC
is 787Hz which reduces the total amplifier noise to:
33nV/
√
Hz
√
787Hz = 0.93
μ
V.
The total noise is the RMS sum of this noise with the 2
μ
V
noise of the ADC at OSR=256.
√
0.93
μ
V
2
+ 2uV
2
= 2.2
μ
V.
Increasing the oversampling ratio to 32768 reduces the
noise bandwidth of the ADC to 6.2Hz which reduces the
total amplifier noise to:
33nV/
√
Hz
√
6.2Hz = 82nV.
The total noise is the RMS sum of this noise with the 200nV
noise of the ADC at OSR = 32768.
√
82nV
2
+ 2
μ
V
2
= 216nV.
In this way, the digital filter with its variable oversampling
ratio can greatly reduce the effects of external noise
sources.
Using Non-Autozeroed Amplifiers for Lowest Noise
Applications
Ultralow noise applications may require the use of low
noise bipolar amplifiers that are not autozeroed. Because
the LTC2440 has such exceptionally low offset, offset drift
and 1/f noise, the offset drift and 1/f noise in the amplifiers
may need to be compensated for to retain the system
performance of which the ADC is capable.
The circuit of Figure 23 uses low noise bipolar amplifiers
and correlated double sampling to achieve a resolution of
14nV, or 19 effective bits over a 10mV span. Each mea-
surement is the difference between two ADC readings
taken with opposite polarity bridge excitation. This can-
cels 1/f noise below 3.4Hz and eliminates errors due to
parasitic thermocouples. Allow 750
μ
s settling time after
switching excitation polarity.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC2440IGN | 24-Bit High Speed Differential delta-sigma ADC with Selectable Speed/Resolution |
| LTC2444 | 24-Bit High Speed 8-/16-Channel ADCs with Selectable Speed/Resolution |
| LTC2444C | 24-Bit High Speed 8-/16-Channel ADCs with Selectable Speed/Resolution |
| LTC2444CUHF | 24-Bit High Speed 8-/16-Channel ADCs with Selectable Speed/Resolution |
| LTC2444I | 24-Bit High Speed 8-/16-Channel ADCs with Selectable Speed/Resolution |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC2440CGN#PBF | 功能描述:IC ADC DIFFER 24-BIT HS 16-SSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標準包裝:1 系列:microPOWER™ 位數(shù):8 采樣率（每秒）:1M 數(shù)據(jù)接口:串行，SPI? 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:- 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應商設(shè)備封裝:24-VQFN 裸露焊盤（4x4） 包裝:Digi-Reel® 輸入數(shù)目和類型:8 個單端，單極 產(chǎn)品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6 |
| LTC2440CGN#PBF | 制造商:Linear Technology 功能描述:24BIT ADC DELTA SIG HS 16SSOP 制造商:Linear Technology 功能描述:24BIT ADC, DELTA SIG, HS, 16SSOP |
| LTC2440CGN#TR | 功能描述:IC CONV A/D 24-BIT DIFF 16-SSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標準包裝:1,000 系列:- 位數(shù):16 采樣率（每秒）:45k 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:315mW 電壓電源:模擬和數(shù)字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類型:2 個單端，單極 |
| LTC2440CGN#TRPBF | 功能描述:IC ADC DIFFER 24-BIT HS 16-SSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標準包裝:1,000 系列:- 位數(shù):16 采樣率（每秒）:45k 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:315mW 電壓電源:模擬和數(shù)字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類型:2 個單端，單極 |
| LTC2440CGNPBF | 制造商:Linear Technology 功能描述:ADC,LTC2440C 24bit diff D-S SPI SSOP |
發(fā)布緊急采購，3分鐘左右您將得到回復。