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參數(shù)資料
| 型號： | LTC2404CG |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 4-/8-Channel 24-Bit uPower No Latency ADCs |
| 中文描述： | 4-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO28 |
| 封裝： | 0.209 INCH, PLASTIC, SSOP-28 |
| 文件頁數(shù)： | 27/36頁 |
| 文件大?。?/td> | 351K |
| 代理商： | LTC2404CG |
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27
LTC2404/LTC2408
quently, these resistors should be low temperature coef-
ficient devices. The use of higher resistance RTDs is not
recommended in this topology, although the inclusion of
one 1000
RTD at the top on the ladder will have minimal
impact on the lower elements. The same caveat applies to
fast changing temperatures. Any fast changing sensors
should be at the top of the ladder.
The LTC2408’s Uncommitted Multiplexer Finds Use in
a Programmable Gain Scheme
If the multiplexer in the LTC2408 is not committed to
channel selection, it can be used to select various signal-
processing options such as different gains, filters or at-
tenuator characteristics. In Figure 25, the multiplexer is
shown selecting different taps on an R/2R ladder in the
feedback loop of an amplifier. This example allows selec-
tion of gain from 1 to 128 in binary steps. Other feedback
networks could be used to provide gains tailored for
specific purposes. (For example, 1x, 1.1x, 1.41x, 2x,
2.028x, 5x, 10x, 40x, etc.) Alternatively, different bandpass
APPLICATIO
S I
FOR
ATIO
U
W
U
U
characteristics or signal inversion/noninversion could be
selected. The R/2R ladder can be purchased as a network
to ensure tight temperature tracking. Alternatively, resis-
tors in a ladder or as separate dividers can be assembled
from discrete resistors. In the configuration shown, the
channel resistance of the multiplexer does not contribute
much to the error budget, as only input op amp current
flows through the switch. The LTC1050 was chosen for
its low input current and offset voltage, as well as its
ability to drive the input of a
Σ
ADC.
Insert Gain or Buffering After the Multiplexer
Separate MUXOUT and ADCIN terminals permit insertion
of a gain stage between the MUX and the ADC. If passive
filtering is used at the input to the ADC, a buffer amplifier
is strongly recommended to avoid errors resulting from
the dynamic ADC input current. If antialiasing is required,
it should be placed at the input to the MUX. If bandwidth
limiting is required to improve noise performance, a filter
with a –3dB point at 1500Hz will reduce the effective total
Figure 24. Measuring Up to Seven RTD Temperatures with One Reference Resistor and One Reference Current
2404/08 F24
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
9
10
11
12
13
14
15
17
–
8-CHANNEL
MUX
6
COM
GND
1, 5, 16, 18, 22, 27, 28
23
20
25
19
21
24
CSADC
CSMUX
SCK
CLK
D
IN
SDO
26
F
O
LTC2408
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
V
REF
2, 8
1
μ
F
5V
V
CC
V
CC
+
–
+
LTC1050
LTC1634-2.5
+
24-BIT
∑
ADC
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC2404IG | 4-/8-Channel 24-Bit uPower No Latency ADCs |
| LTC2404 | 18-Bit Universal Bus Driver With 3-State Outputs 56-TVSOP -40 to 85 |
| LTC2404C | 18-Bit Universal Bus Driver With 3-State Outputs 56-SSOP -40 to 85 |
| LTC2404I | 18-Bit Universal Bus Driver With 3-State Outputs 56-TSSOP -40 to 85 |
| LTC2408 | 18-Bit Universal Bus Driver With 3-State Outputs 56-TVSOP -40 to 85 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC2404CG#PBF | 功能描述:IC ADC 24BIT 4CH MICROPWR 28SSOP 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 |
| LTC2404CG#TR | 功能描述:IC ADC 24BIT 4CH MICROPWR 28SSOP 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(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 |
| LTC2404CG#TRPBF | 功能描述:IC ADC 24BIT 4CH MICROPWR 28SSOP 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 |
| LTC2404CGPBF | 制造商:Linear Technology 功能描述:ADC,LTC2404C 24bit D-S 4 ch SPI SSOP |
| LTC2404IG | 功能描述:IC ADC 24BIT 4CH MICROPWR 28SSOP 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(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 |
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