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参数资料
| 型号： | LTC1098ACS8#TR |
| 厂商： | Linear Technology |
| 文件页数： | 11/32页 |
| 文件大小： | 0K |
| 描述： | IC ADC 8BIT SERIAL I/O 5V 8SOIC |
| 标准包装： | 2,500 |
| 位数： | 8 |
| 采样率（每秒）： | 33k |
| 数据接口： | 串行 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 780µW |
| 电压电源： | 单电源 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 1 个差分，单极 |
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LTC1096/LTC1096L
LTC1098/LTC1098L
19
10968fc
APPLICATIONS INFORMATION
Figure 3. LTC1098(L) Operation with DIN and DOUT Tied Together
Figure 4. Automatic Power Shutdown Between Conversions
Allows Power Consumption to Drop with Sample Rate
Figure 5. After a Conversion, When the Microprocessor
Drives CS High, the ADC Automatically Shuts Down Until the
Next Conversion. The Supply Current, Which Is Very Low
During cConversions, Drops to Zero in Shutdown
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 conict.
In the Typical Applications section, there is an example of
interfacing the LTC1098(L) with DINand DOUT tied together
to the Intel 8051 MPU.
ACHIEVING MICROPOWER PERFORMANCE
With typical operating currents of 40μA and automatic
shutdown between conversions, the LTC1096/LTC1098
achieves extremely low power consumption over a wide
range of sample rates (see Figure 4). In systems that
convert continuously, the LTC1096/LTC1098 will draw
1
2
3
4
CS
CLK
DATA (DIN/DOUT)
START
SGL/DIFF
ODD/SIGN
MSBF
B7
B6
MSBF BIT LATCHED
BY LTC1098(L)
LTC1098(L) CONTROLS DATA LINE AND SENDS
A/D RESULT BACK TO MPU
MPU CONTROLS DATA LINE AND SENDS
MUX ADDRESS TO LTC1098(L)
PROCESSOR MUST RELEASE
DATA LINE AFTER 4TH RISING CLK
AND BEFORE THE 4TH FALLING CLK
LTC1098(L) TAKES CONTROL OF
DATA LINE ON 4TH FALLING CLK
10968 F03
its normal operating power continuously. Figure 5 shows
that the typical current varies from 40μA at clock rates
below 50kHz to 100μA at 500kHz. Several things must
be taken into account to achieve such a low power
consumption.
Sample Rate, fSAMPLE (kHz)
0.1
1
SUPPL
Y
CURRENT
,I
CC
(μA)
10
100
1000
1
10
100
10968 F04
TA = 25°C
VCC = 5V
CLOCK FREQUENCY (Hz)
20
SUPPL
Y
CURRENT
,I
CC
(μA)
60
80
120
140
100
10k
100k
1M
10968 F05
0
1k
100
40
0.002
TA = 25°C
VCC = 5V
ACTIVE (CS LOW)
SHUTDOWN (CS HIGH)
SUPPLY CURRENT vs CLOCK RATE FOR
ACTIVE AND SHUTDOWN MODES
Shutdown
Figures 1 and 2 show the operating sequence of the
LTC1096/LTC1098. The converter draws power when the
CS pin is low and powers itself down when that pin is high.
If the CS pin is not taken to ground when it is low and not
taken to supply voltage when it is high, the input buffers
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| LTC1098ACS8-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Micropower Sampling 8-Bit Serial I/O A/D Converters |
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