- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄385506 > LTC2428IG (LINEAR TECHNOLOGY CORP) 4-/8-Channel 20-Bit uPower No Latency ADCs PDF資料下載
參數(shù)資料
| 型號： | LTC2428IG |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 4-/8-Channel 20-Bit uPower No Latency ADCs |
| 中文描述： | 8-CH 20-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO28 |
| 封裝： | 0.209 INCH, PLASTIC, SSOP-28 |
| 文件頁數(shù)： | 23/28頁 |
| 文件大?。?/td> | 317K |
| 代理商： | LTC2428IG |
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頁當前第23頁第24頁第25頁第26頁第27頁第28頁
23
LTC2424/LTC2428
APPLICATIO
S I
FOR
ATIO
U
As a result of the oversampling ratio (256) and the digital
filter, minimal (if any) antialias filtering is required in front
of the LTC2424/LTC2428. If passive RC components are
placed in front of the LTC2424/LTC2428, the input dy-
namic current should be considered. In cases where large
effective RC time constants are used, an external buffer
amplifier may be required to minimize the effects of input
dynamic current.
The modulator contained within the LTC2424/LTC2428
can handle large-signal level perturbations without satu-
rating. Signal levels up to 40% of V
REF
do not saturate the
analog modulator. These signals are limited by the input
ESD protection to 300mV below ground and 300mV above
V
CC
.
W
U
U
The LTC2428’s Resolution and Accuracy Allows You
to Measure Points in a Ladder of Sensors
In many industrial processes, for example, cracking tow-
ers in petroleum refineries, a group of temperature mea-
surements must be related to one another. A series of
platinum RTDs that sense slow changing temperatures
can be configured into a resistive ladder, using the LTC2428
to sense each node. This approach allows a single excita-
tion current passed through the entire ladder, reducing
total supply current consumption. In addition, this ap-
proach requires only one high precision resistor, thereby
reducing cost. A group of up to seven temperatures can be
measured as a group by a single LTC2428 in a loop-pow-
ered remote acquisition unit. In the example shown in
Figure 22, the excitation current is 240
μ
A at 0
°
C. The
LTC2428 requires 300
μ
A, leaving nearly 3.5mA for the
remainder of the remote transmitter.
The resistance of any of the RTDs (PT1 to PT7) is deter-
mined from the voltage across it, as compared to the
voltage drop across the reference resistor (R1). This is a
ratiometric implementation where the voltage drop across
R1 is given by V
REF
– V
CH1
. Channel 7 is used to measure
the voltage on a representative length of wire. If the same
type and length of wire is used for all connections, then
errors associated with the voltage drops across all wiring
can be removed in software. The contribution of wiring
drop can be scaled if wire lengths are not equal.
Figure 22. Measuring Up to Seven RTD Temperatures with One Reference Resistor and One Reference Current
24248 F22
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
ZS
SET
9
10
11
12
13
14
15
17
–
8-CHANNEL
MUX
5
GND
1, 6, 16, 18, 22, 27, 28
23
20
25
19
21
24
CSADC
CSMUX
SCK
CLK
D
IN
SDO
26
F
O
LTC2428
ADCIN
MUXOUT
7
4
7
0.1
μ
F
6
3
6
47
μ
F
R2
300
μ
A
5V
4
5
OPTIONAL
GAIN
BLOCK
2
TO PT3-PT6
PT1
100
PLATINUM
RTD
OPTIONAL
PROTECTION
RESISTORS
5k MAX
UP TO SEVERAL
HUNDRED FEET.
ALL SAME
WIRE TYPE
PT2
PT7
4
R3
5V
R2
R1
20.1k
0.1%
3
FS
SET
V
CC
2, 8
1
μ
F
5V
V
CC
+
–
+
LTC1050
LTC1634-2.5
+
20-BIT
∑
ADC
相關PDF資料 |
PDF描述 |
|---|---|
| LTC2442 | 24-Bit High Speed 4-Channel Delta-Sigma ADC with Integrated Amplifi er |
| LTC2442CG | 24-Bit High Speed 4-Channel Delta-Sigma ADC with Integrated Amplifi er |
| 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 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC2428IG#PBF | 功能描述:IC ADC 20BIT 8CH MICROPWR 28SSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 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 |
| LTC2428IG#TR | 功能描述:IC ADC 20BIT 8CH MICROPWR 28SSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 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 |
| LTC2428IG#TRPBF | 功能描述:IC ADC 20BIT 8CH MICROPWR 28SSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 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 |
| LTC2430CGN | 功能描述:IC ADC 20BIT DIFFINPUT/REF16SSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:- 標準包裝:2,500 系列:- 位數(shù):16 采樣率（每秒）:15 數(shù)據(jù)接口:MICROWIRE?，串行，SPI? 轉換器數(shù)目:1 功率耗散（最大）:480µW 電壓電源:單電源 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:38-WFQFN 裸露焊盤 供應商設備封裝:38-QFN（5x7） 包裝:帶卷 (TR) 輸入數(shù)目和類型:16 個單端，雙極；8 個差分，雙極 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494 |
| LTC2430CGN#PBF | 功能描述:IC ADC 20BIT DIFFINPUT/REF16SSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:- 標準包裝:2,500 系列:- 位數(shù):16 采樣率（每秒）:15 數(shù)據(jù)接口:MICROWIRE?，串行，SPI? 轉換器數(shù)目:1 功率耗散（最大）:480µW 電壓電源:單電源 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:38-WFQFN 裸露焊盤 供應商設備封裝:38-QFN（5x7） 包裝:帶卷 (TR) 輸入數(shù)目和類型:16 個單端，雙極；8 個差分，雙極 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494 |
發(fā)布緊急采購，3分鐘左右您將得到回復。