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| 型號： | AD7471 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 1.4us，642μW Micropower12-Bit Parallel ADC(12位高速,低耗,逐次逼近式A/D轉(zhuǎn)換器) |
| 中文描述： | 1.4us，642μWMicropower12位并行ADC（12位高速，低耗，逐次逼近式的A / D轉(zhuǎn)換器） |
| 文件頁數(shù)： | 12/13頁 |
| 文件大小： | 203K |
| 代理商： | AD7471 |
AD7471
–12–
REV. PrB
Prelimnary Technical Data
DATA
10
m
s
TECHNCAL
8.6
m
s
POWE R V’ S T H R OUGH PUT
T he two modes of operation for this part will produce
different power performances, Mode 1 and Mode 2 - see
Operating Modes section of the data sheet for more detail
descriptions of these modes. Mode 2 is Automatic Power-
Down of the part after conversion and it achieves the opti-
mum power poformance from the AD7471.
Mode 1
Figure 14 shows the AD7471 conversion sequence in
Mode 1 using a throughput rate of 100 kSPS and a clock
frequency of 10 MHz. At 5 V supply the current consump-
tion for the part when converting is typically 200 μA and
the quiescent current is 116 μA. T he digital current con-
sumption is typically 85 μA. T he conversion time of 1.4 μs
contributes 140 μW to the overall power dissipation in the
following way:
(1.4 μ
s
/10 μ
s
) x (5 x 200 μ
A
) = 140 μ
W
T he contribution to the total power dissipated by the re-
maining 8.6 μs of the cycle is 498 μW.
(8.6 μ
s
/10 μ
s
) x (5 x 116 μ
A
) = 498 μ
W
T hus the power dissipated during each cycle, which in-
cludes digital current consumption, is......
140 μ
W
+ 498 μ
W
+ (5 x 85 μ
W)
= 1.063
mW
CONVST
BU SY
1.4
m
s
t
C ON V E R T
t
QU IE SC E N T
Figure 14. Mode 1 Power Dissipation
Mode 2
Figure 15 shows the AD7471 conversion sequence in
Mode 2 using a throughput rate of 100 kSPS and a clock
frequency of 10 MHz. At 5 V supply the current consump-
tion for the part when converting is 200 μA, while the
sleep current is 1 μA max. T he power dissipated during
this power-down is negligible and is thus not worth con-
sidering in the total power figure. During the wake-up
phase, the AD7471 will draw 120 μA. Overall power dis-
sipated is:
(1.4 μs/10 μs)x(5 x 200 μA) + (1 μs/10 μs) x (5 x 120 μA) = 200 μW
CONVST
BU SY
t
W A K E U P
1.4
m
s
8.6
m
s
10
m
s
1
m
s
t
C ON V E R T
t
Q U IE SC E N T
Figure 15. Mode 2 Power Dissipation
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