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參數資料
型號: AD7883
廠商: Analog Devices, Inc.
英文描述: LC2MOS 12-Bit, 3.3 V Sampling ADC
中文描述: LC2MOS 12位,3.3伏采樣ADC
文件頁數: 10/12頁
文件大小: 349K
代理商: AD7883
AD7883
REV. 0
–10–
POWER-DOWN CONTROL (MODE INPUT)
The AD7883 is designed for systems which need to have mini-
mum power consumption. This includes such applications as
hand held, portable battery powered systems and remote moni-
toring systems. As well as consuming minimum power under
normal operating conditions, typically 8 mW, the AD7883 can
be put into a power-down or sleep mode when not required to
convert signals. When in this power-down mode, the AD7883
consumes 1 mW of power.
The AD7883 is powered down by bringing the MODE input
pin to a Logic Low in conjunction with keeping the
RD
input
control High. The AD7883 will remain in the power-down
mode until MODE is brought to a Logic High again. The
MODE input should be driven with CD4000 or HCMOS logic
levels.
It is recommended that one “dummy” conversion be imple-
mented before reading conversion data from the AD7883 after it
has been in the powerdown mode. This is required to reset all
internal logic and control circuitry. Allow one clock cycle before
doing the dummy conversion. In a remote monitoring system
where, say, 10 conversions are required to be taken with a sam-
pling interval of 1 second, an additional 11th conversion must
be carried out. Figure 14 gives a plot of power consumption as a
function of time for such operation. The total conversion time
for each cycle is 11
×
20
μ
s (where 20
μ
s is the time taken for a
single conversion) corresponding to 2.2
×
10
–4
secs.
0
1
2
TIME – secs
POWER
CONSUMPTION
– mW
8
1
CONVERTING
POWER-DOWN
CONVERTING
POWER-DOWN
2.2 x 10
–4
Figure 14. Power Consumption for Normal Operation and
Power-Down Operation vs. Time
Hence:
Average Power
= Power
CONVERTING
+ Power
POWER-DOWN
= {8 mW
×
(2.2
×
10
–4
)}
+ {1 mW
×
(0.9998)}
= 1.0015 mW
相關PDF資料
PDF描述
AD7883BN LC2MOS 12-Bit, 3.3 V Sampling ADC
AD7883BR LC2MOS 12-Bit, 3.3 V Sampling ADC
AD7884 LC2MOS 16-Bit, High Speed Sampling ADCs
AD7884AN LC2MOS 16-Bit, High Speed Sampling ADCs
AD7884AP LC2MOS 16-Bit, High Speed Sampling ADCs
相關代理商/技術參數
參數描述
AD7883BN 制造商:Analog Devices 功能描述:ADC Single SAR 50ksps 12-bit Parallel 24-Pin SOIC W 制造商:Rochester Electronics LLC 功能描述:12 BIT A/D CONVERTER IC - Bulk
AD7883BR 制造商:Analog Devices 功能描述:ADC Single SAR 50ksps 12-bit Parallel 24-Pin SOIC W 制造商:Analog Devices 功能描述:ADC SGL SAR 50KSPS 12-BIT PARALLEL 24SOIC W - Rail/Tube 制造商:Rochester Electronics LLC 功能描述:12 BIT A/D CONVERTER IC - Bulk
AD7883BR-REEL 制造商:Analog Devices 功能描述:ADC Single SAR 50ksps 12-bit Parallel 24-Pin SOIC W T/R 制造商:Analog Devices 功能描述:ADC SGL SAR 50KSPS 12-BIT PARALLEL 24SOIC W - Tape and Reel 制造商:Rochester Electronics LLC 功能描述:12 BIT A/D CONVERTER IC - Tape and Reel
AD7884AP 制造商:Analog Devices 功能描述:ADC Single 2-Step Flash 166ksps 16-bit Parallel 44-Pin PLCC 制造商:Rochester Electronics LLC 功能描述:16-BIT PARAL.SAMPL.ADC IC - Bulk
AD7884AP-REEL 制造商:Analog Devices 功能描述:ADC Single 2-Step Flash 166ksps 16-bit Parallel 44-Pin PLCC T/R 制造商:Rochester Electronics LLC 功能描述:16-BIT PARAL.SAMPL ADC IC - Tape and Reel
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