參數(shù)資料
型號(hào)： AME7107R
廠商： AME, Inc.
英文描述： 3-1/2 Digit A/D Converter High Accuracy, Low Power
中文描述： 3-1/2位A / D轉(zhuǎn)換高精度，低功耗
文件頁(yè)數(shù)： 14/20頁(yè)
文件大?。?/td> 1425K
代理商： AME7107R
AME, Inc.
14
AME7106/AME7106A/AME7106R
AME7107/AME7107A/AME7107R
3-1/2 Digit A/D Converter
High Accuracy, Low Power
output is at 3.2V. Maximum power dissipation is 8.1 mA
X 3.2 V X 24 segments = 622mW. However, once the
AME7107 output voltage is above two volts, the LED cur-
rent is essentially constant as output voltage increases.
Reducing the output voltage by 0.7V, results in 7.7mA of
LED current, only a 5 percent reduction. Maximum power
dissipation is only 7.7mA X 2.5V X 24 = 462 mW, a re-
duction of 26%. An output voltage reduction of 1 volt
reduces LED current by 10% (7.3mA) power dissipation
by 38%. (7.3mA X 2.2V X 24 = 385mW).
There are two ways to reduce the power dissipation:
either a 5.1 ohm resistor or a 1 Amp diode placed in
series with the display (but not in series with the
AME7107). The resistor will reduce the AME7107 out-
put voltage, when all 24 segments are “ON”. When
segments turn off, the output voltage will increase. The
diode, on the other hand, will result in a relatively steady
output voltage.
In addition to limiting maximum power dissipation, the
resistor reduces the change in power dissipation as the
display changes. As fewer segments are “ON,” each
“ON” output drops more voltage and current. For the
best case of six segments (a “111” display) to worst
case (a “1888” display) the resistor will change about
230 mW. While a circuit without the resistor will change
about 470 mW. Therefore, the resistor will reduce the
variation of power dissipation by about 50%.
The change in LED brightness caused by the resistor is
almost unnoticeable as more segments turn off. If steady
display brightness is very important, a diode is recom-
mended.
n
Typical Applications
相關(guān)PDF資料
PDF描述
AME7107Y 3-1/2 Digit A/D Converter High Accuracy, Low Power
AME7107RCPL 3-1/2 Digit A/D Converter High Accuracy, Low Power
AME7106ACKW 3-1/2 Digit A/D Converter High Accuracy, Low Power
AME7107ACKW 3-1/2 Digit A/D Converter High Accuracy, Low Power
AME7700 Switched Capacitor Voltage Doublers
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AME7107RCPL 制造商:AME 制造商全稱:Analog Microelectronics 功能描述:3-1/2 Digit A/D Converter High Accuracy, Low Power
AME7107Y 制造商:AME 制造商全稱:Analog Microelectronics 功能描述:3-1/2 Digit A/D Converter High Accuracy, Low Power
AME7700 制造商:AME 制造商全稱:Analog Microelectronics 功能描述:Switched Capacitor Voltage Doublers
AME7700AEEV 制造商:AME 制造商全稱:Analog Microelectronics 功能描述:Switched Capacitor Voltage Doublers
AME7701 制造商:AME 制造商全稱:Analog Microelectronics 功能描述:Switched Capacitor Voltage Doublers
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