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參數(shù)資料
| 型號： | LTC1285CS8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 3V Micropower Sampling 12-Bit A/D Converters in SO-8 Packages |
| 中文描述： | 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁數(shù)： | 13/24頁 |
| 文件大?。?/td> | 412K |
| 代理商： | LTC1285CS8 |
13
LTC1285/LTC1288
APPLICATIO
I
N
FOR
ATIO
U
Transfer Curve
The LTC1285/LTC1288 are permanently configured for
unipolar only. The input span and code assignment for
this conversion type are shown in the following figures.
W
U
0
1
V
R
–
V
REF
4096
V
R
–
V
R
V
IN
0 0 0 0 0 0 0 0 0 0 0 1
0 0 0 0 0 0 0 0 0 0 0 0
1 1 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1 1 0
LTC1285/88 AI04
1LSB =
Transfer Curve
OUTPUT CODE
0 0 0 0 0 0 0 0 0 0 0 0 0 1
0 0 0 0 0 0 0 0 0 0 0 0 0 0
1 1 1 1 1 1 1
1 1 1 1 1 1
INPUT VOLTAGE
V
REF
– 1LSB
V
REF
– 2LSB
1LSB
0V
INPUT VOLTAGE
(V
REF
= 5.000V)
4.99878V
4.99756V
0.00122V
0V
LTC1285/88 AI05
Output Code
Operation with D
IN
and D
OUT
Tied Together
The LTC1288 can be operated with D
IN
and D
OUT
tied
together. This eliminates one of the lines required to
communicate to the microprocessor (MPU). Data is trans-
mitted in both directions on a single wire. The processor
pin connected to this data line should be configurable as
either an input or an output. The LTC1288 will take control
of the data line and drive it low on the 4th falling CLK edge
after the start bit is received (see Figure 3). Therefore the
processor port line must be switched to an input before
this happens to avoid a conflict.
In the Typical Applications section, there is an example of
interfacing the LTC1288 with D
IN
and D
OUT
tied together to
the Intel 8051 MPU.
ACHIEVING MICROPOWER PERFORMANCE
With typical operating currents of 160
μ
A and automatic
shutdown between conversions, the LTC1285/LTC1288
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.
Figure 3. LTC1288 Operation with D
IN
and D
OUT
Tied Together
1
2
3
4
CS
CLK
DATA
(D
IN
/D
OUT
)
START
SGL/DIFF
ODD/SIGN
MSBF
B11
B10
MSBF BIT LATCHED
BY LTC1288
LTC1288 CONTROLS DATA LINE AND SENDS
A/D RESULT BACK TO MPU
LTC1288 TAKES CONTROL OF DATA LINE
ON 4TH FALLING CLK
MPU CONTROLS DATA LINE AND SENDS
MUX ADDRESS TO LTC1288
PROCESSOR MUST RELEASE DATA LINE AFTER
4TH RISING CLK AND BEFORE THE 4TH FALLING CLK
LTC1285/88 F03
SAMPLE FREQUENCY (kHz)
0.1
1
S
μ
A
10
100
1000
1
10
100
LTC1285/88 F04
T
A
= 25°C
V
CC
= 2.7V
V
REF
= 2.5V
f
CLK
= 120kHz
Figure 4. Automatic Power Shutdown Between Conversions
Allows Power Consumption to Drop with Sample Rate
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC1288 | Single Channel Codec-Bandwidth Independent of Sampling Rate 28-PLCC 0 to 70 |
| LTC1288CS8 | 3V Micropower Sampling 12-Bit A/D Converters in SO-8 Packages |
| LTC1289BC | 3 Volt Single Chip 12-Bit Data Acquisition System |
| LTC1289CCJ | 3 Volt Single Chip 12-Bit Data Acquisition System |
| LTC1289CCN | 3 Volt Single Chip 12-Bit Data Acquisition System |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1285CS8#PBF | 功能描述:IC A/D CONV SAMPLING 12BIT 8SOIC 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 |
| LTC1285CS8#TR | 功能描述:IC ADC 12BIT 3V SAMPLING 8SOIC 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 |
| LTC1285CS8#TRPBF | 功能描述:IC A/D CONV SAMPLING 12BIT 8SOIC 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 |
| LTC1285CS8PBF | 制造商:Linear Technology 功能描述:LTC1285CS8PBF |
| LTC1285IS8 | 功能描述:IC A/D CONV SAMPLING 12BIT 8SOIC 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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