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| 型號： | AD7818ARZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 14/20頁 |
| 文件大小： | 279K |
| 描述： | IC ADC 10BIT W/TEMP SENSOR 8SOIC |
| 產(chǎn)品變化通告： | Product Discontinuance 27/Oct/2011 |
| 標(biāo)準(zhǔn)包裝： | 98 |
| 功能： | 溫度監(jiān)控系統(tǒng)（傳感器） |
| 傳感器類型： | 內(nèi)部 |
| 感應(yīng)溫度： | -55°C ~ 125°C |
| 精確度： | ±2°C |
| 拓?fù)洌?/td> | ADC，多路復(fù)用器，寄存器庫 |
| 輸出類型： | MICROWIRE?，QSPI?，SPI? |
| 輸出警報： | 是 |
| 輸出風(fēng)扇： | 是 |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SO |
| 包裝： | 管件 |
REV. C
14
AD7816/AD7817/AD7818
DB7 DB0
DB7(DB9) DB0
D
OUT
CONVST
SCLK
BUSY
CS
RD/WR
D
IN
OTI
t
2
t
1
t
17
t
15
t
16
t
3
Figure 16. Mode 1 Operation
TIME secs
0.8
0.01
0
16
4
6
10
12
0.5
0.2
0.7
0.4
0.0
AIR
0.6
0.3
0.1
2
8
14
FLUID
HEAT SINK
Figure 14. Self-Heating Effect in Air, Fluid, and in Thermal
Contact with a Heat Sink
TIME secs
0.25
0.05
0.0
2.0
0.5
1.5
0.15
0.05
0.10
0.00
AIR
1.0
FLUID
HEATSINK
0.20
Figure 15. Self-Heating Effect in Air, Fluid, and in Thermal
Contact with a Heat Sink
OPERATING MODES
The AD7816, AD7817, and AD7818 have two possible modes
of operation depending on the state of the CONVST pulse at
the end of a conversion.
Mode 1
In this mode of operation the CONVST pulse is brought high
before the end of a conversion, i.e., before the BUSY goes low
(see Figure 16). When operating in this mode a new conversion
should not be initiated until 100 ns after the end of a serial read
operation. This quiet time is to allow the track/hold to accu-
rately acquire the input signal after a serial read.
Mode 2
When the AD7816, AD7817, and AD7818 are operated in Mode
2 (see Figure 17), they automatically power down at the end of
a conversion. The CONVST is brought low to initiate a conver-
sion and is left logic low until after the end of the conversion. At
this point, i.e., when BUSY goes low, the devices will power-
down. The devices are powered up again on the rising edge of
the CONVST signal. Superior power performance can be
achieved in this mode of operation by powering up the AD7816,
AD7817, and AD7818 only to carry out a conversion (see Power
vs. Throughput section). In Figure 17 the CS line is applicable
to the AD7817 only.
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