- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄385506 > LTC2442CG (LINEAR TECHNOLOGY CORP) 24-Bit High Speed 4-Channel Delta-Sigma ADC with Integrated Amplifi er PDF資料下載
參數(shù)資料
| 型號： | LTC2442CG |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 24-Bit High Speed 4-Channel Delta-Sigma ADC with Integrated Amplifi er |
| 中文描述： | 4-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO36 |
| 封裝： | 5.30 MM, PLASTIC, SSOP-36 |
| 文件頁數(shù)： | 27/32頁 |
| 文件大?。?/td> | 392K |
| 代理商： | LTC2442CG |
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頁第26頁當(dāng)前第27頁第28頁第29頁第30頁第31頁第32頁
LTC2442
27
2442f
APPLICATIU
Low Power Operation
The integrated buffers have a supply current of 1mA total,
greatly reducing the total power consumption when the
ADC is operated at a low duty cycle. The typical approach
to driving a
ΔΣ
ADC is to use a high bandwidth ampli-
fier that settles very quickly in response to the sampling
process at the ADC input. The LTC2442 approach is to use
an accurate, low bandwidth amplifier that requires a load
capacitor for compensation. This capacitor also serves as
a charge reservoir during the sampling process, so the
disturbance at the ADC input is minimal. The amplifier
only supplies the average sampling current that the ADC
draws, which is on the order of 50μA.
W
U
U
Scaling for Higher Input Voltages
The LTC2442 is ideally suited for applications with low-level,
differential signal with a common mode approximately
equal to mid-supply, such as strain gages and silicon
micromachined sensors. Other applications require scaling
a high voltage signal to the range of the ADC.
Figure 20 shows how to properly scale a bipolar, ground-
referred input voltage to drive the LTC2442. First, the
input must be level shifted so that it never exceeds the
LTC2442 supply rails. This is commonly done with an
instrumentation amplifier or simple op-amp level shift
circuit. Rather than shift the analog input, the LTC2442
can run on ±2.5V supplies so that ground is centered in
the input range. This is equivalent to a perfect analog
level shift with no degradation in accuracy. The digital
signals are shifted from 0 to 5V logic to ±2.5V logic by a
very inexpensive 74HC4053 analog switch and the data
from the LTC2442 is shifted back to 0 to 5V logic by a
MMBT3904 transistor.
On both inputs, precision resistor networks scale the input
signal from ±10V to ±2.5V. CH0-1 is driven truly differen-
tially for maximum linearity, typically better than 3ppm,
however 3 resistors and an LTC2050HV autozero amplifier
are required. The 8.88k
Ω
output resistor balances the offset
associated with the LTC2442’s bias current. The resistance
seen by CH0 is 4.44k and the offset at CH0 is also inverted
and appears at the output of the LTC2050HV.
CH2 to CH3 is driven single-ended, with CH3 tied to ground.
This degrades linearity slightly, but it is easier to implement
than a true differential drive. In this case the resistance at
CH3 should be equal to the resistance at CH2 or 7.5k. This
circuit is also suitable for signals that are always positive,
with the LTC2442 operating on a single 5V supply.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC2442IG | 24-Bit High Speed 4-Channel Delta-Sigma ADC with Integrated Amplifi er |
| LTC3416 | 4A, 4MHz, Monolithic Synchronous Step-Down Regulator with Tracking |
| LTC3416EFE | 3.3-V CMOS 18-Bit Universal Bus Driver with 3-State Outputs 56-SSOP -40 to 85 |
| LTC3426 | 1.2MHz Step-Up DC/DC Converter in SOT-23 |
| LTC3426ES6 | 1.2MHz Step-Up DC/DC Converter in SOT-23 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC2442CG#PBF | 功能描述:IC ADC 24BIT 4CH 36-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(biāo)準(zhǔn)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(yīng)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 |
| LTC2442CG#TRPBF | 功能描述:IC ADC 24BIT 250MSPS 36-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(biāo)準(zhǔn)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(yīng)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 |
| LTC2442CGPBF | 制造商:Linear Technology 功能描述:ADC 8ksps 24-Bit Serial SSOP36 |
| LTC2442IG#PBF | 功能描述:IC ADC 24BIT 4CH 36-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(biāo)準(zhǔn)包裝:1,000 系列:- 位數(shù):12 采樣率（每秒）:300k 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數(shù)目和類型:1 個單端，單極；1 個單端，雙極 |
| LTC2442IG#TRPBF | 功能描述:IC ADC 24BIT 250MSPS 36-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(biāo)準(zhǔn)包裝:1,000 系列:- 位數(shù):12 采樣率（每秒）:300k 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數(shù)目和類型:1 個單端，單極；1 個單端，雙極 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。