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參數資料
| 型號： | LTC1298CS8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | Micropower Sampling 12-Bit A/D Converters In S0-8 Packages |
| 中文描述： | 2-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁數： | 13/24頁 |
| 文件大?。?/td> | 418K |
| 代理商： | LTC1298CS8 |
13
LTC1286/LTC1298
APPLICATIO
I
FOR
ATIO
U
W
U
U
SAMPLE RATE (kHz)
0.1k
1
10
100
1000
1k
10k
100k
LT1286/98 G03
S
T
A
= 25°C
V
CC
= V
= 5V
f
CLK
= 200kHz
LTC1286
LTC1298
input becomes high impedance at the end of each conver-
sion leaving the CLK running to clock out the LSB first data
or zeroes (see Figures 1 and 2). If the CS is not running rail-
to-rail, the input logic buffer will draw current. This current
may be large compared to the typical supply current. To
obtain the lowest supply current, bring the CS pin to
ground when it is low and to supply voltage when it is high.
When the CS pin is high (= supply voltage), the converter
is in shutdown mode and draws only leakage current. The
status of the D
IN
and CLK input have no effect on supply
current during this time. There is no need to stop D
IN
and
CLK with CS = high; they can continue to run without
drawing current.
Minimize CS Low Time
In systems that have significant time between conver-
sions, lowest power drain will occur with the minimum CS
low time. Bringing CS low, transferring data as quickly as
possible, and then bringing it back high will result in the
lowest current drain. This minimizes the amount of time
the device draws power. After a conversion the ADC
automatically shuts down even if CS is held low (see
Figures 1 and 2). If the clock is left running to clock out
LSB-data or zero, the logic will draw a small current.
Figure 5 shows that the typical supply current with CS =
ground varies from 1
μ
A at 1kHz to 35
μ
A at 200kHz. When
CS = V
CC
, the logic is gated off and no supply current is
drawn regardless of the clock frequency.
Shutdown
The LTC1286/LTC1298 are equipped with automatic shut-
down features. They draw power when the CS pin is low
and shut down completely when that pin is high. The bias
circuit and comparator powers down and the reference
ACHIEVING MICROPOWER PERFORMANCE
With typical operating currents of 250
μ
A and automatic
shutdown between conversions, the LTC1286/LTC1298
achieves extremely low power consumption over a wide
range of sample rates (see Figure 4). The auto-shutdown
allows the supply curve to drop with reduced sample rate.
Several things must be taken into account to achieve such
a low power consumption.
Figure 4. Automatic Power Shutdown Between Conversions
Allows Power Consumption to Drop with Sample Rate.
1
2
3
4
CS
CLK
DATA (D
IN
/D
OUT
)
START
SGL/DIFF
ODD/SIGN
MSBF
B11
B10
MSBF BIT LATCHED
BY LTC1298
LTC1298 CONTROLS DATA LINE AND SENDS
A/D RESULT BACK TO MPU
LTC1298 TAKES CONTROL OF DATA LINE
ON 4TH FALLING CLK
MPU CONTROLS DATA LINE AND SENDS
MUX ADDRESS TO LTC1298
PROCESSOR MUST RELEASE
DATA LINE AFTER 4TH RISING CLK
AND BEFORE THE 4TH FALLING CLK
LTC1286/98 F03
Figure 3. LTC1298 Operation with D
IN
and D
OUT
Tied Together
相關PDF資料 |
PDF描述 |
|---|---|
| LTC1298I | Micropower Sampling 12-Bit A/D Converters In S0-8 Packages |
| LTC1298CN8 | Micropower Sampling 12-Bit A/D Converters In S0-8 Packages |
| LTC1298IN8 | Micropower Sampling 12-Bit A/D Converters In S0-8 Packages |
| LTC1286 | 12.5 ksps,Micropower Sampling 12-Bit A/D Converters In S0-8 Packages(12.5 ksps,12位,采樣模數轉換器(SO-8封裝)) |
| LTC1298 | 11.1 ksps,Micropower Sampling 12-Bit A/D Converters In S0-8 Packages(11.1 ksps,12位,采樣模數轉換器(SO-8封裝)) |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LTC1298CS8#PBF | 功能描述:IC A/D CONV SAMPLING 12BIT 8SOIC RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1 系列:microPOWER™ 位數:8 采樣率（每秒）:1M 數據接口:串行，SPI? 轉換器數目:1 功率耗散（最大）:- 電壓電源:模擬和數字 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 供應商設備封裝:24-VQFN 裸露焊盤（4x4） 包裝:Digi-Reel® 輸入數目和類型:8 個單端，單極 產品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6 |
| LTC1298CS8#TR | 功能描述:IC ADC 12BIT SAMPL MCRPWR 8SOIC RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:16 采樣率（每秒）:45k 數據接口:串行 轉換器數目:2 功率耗散（最大）:315mW 電壓電源:模擬和數字 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) 輸入數目和類型:2 個單端，單極 |
| LTC1298CS8#TRPBF | 功能描述:IC A/D CONV SAMPLING 12BIT 8SOIC RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:16 采樣率（每秒）:45k 數據接口:串行 轉換器數目:2 功率耗散（最大）:315mW 電壓電源:模擬和數字 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) 輸入數目和類型:2 個單端，單極 |
| LTC1298CS8PBF | 制造商:Linear Technology 功能描述:12bit A-D converter,LTC1298CS8 SOIC8 |
| LTC1298IN8 | 功能描述:IC A/D CONV SAMPLING 12BIT 8-DIP RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:16 采樣率（每秒）:45k 數據接口:串行 轉換器數目:2 功率耗散（最大）:315mW 電壓電源:模擬和數字 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) 輸入數目和類型:2 個單端，單極 |
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