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參數資料
| 型號： | 7809LP |
| 廠商： | Maxwell Technologies, Inc |
| 元件分類： | ADC |
| 英文描述： | 16-Bit Latchup Protected Analog to Digital Converter |
| 中文描述： | 16位閉鎖保護模數轉換器 |
| 文件頁數： | 14/23頁 |
| 文件大小： | 462K |
| 代理商： | 7809LP |
M
14
All data sheets are subject to change without notice
2005 Maxwell Technologies
All rights reserved.
16-Bit Latchup Protected Analog to Digital Converter
7809LP
01.11.05 Rev 7
LPT
TM
Operation
Latchup Protection Technology (LPT
TM
) automatically detects an increase in the supply current of the 7809LP con-
verter due to a single event effect and internally cycles the power to the converter off, then on, which restores the
steady state operation of the device. A simplified block diagramof the 7809LP circuitry is shown in Figure 7. The
LPT
TM
circuitry consists of two power switch and current sensor blocks, an LPT
TM
controller block, a BIT current load
block, and an active input protection block.
Figure 7. 7809LP Simplified Block Diagram
The power switch/current sensor blocks sense the supply current drawn by the protected device on the analog and
digital supply pins. When a threshold level is exceeded on either supply line, indicating single event induced latchup of
the protected device, a signal is sent to the LPT
TM
controller block. The LPT
TM
controller then drives the power
switches to an off state which removes the power supplies fromthe protected device. At the same time, a signal is
sent to open the active input protection circuits and the LPSTATUS output pin is activated. After a period of time suffi-
cient to clear the latchup, the LPT
TM
controller drives the power switches and input protection back to the on state
restoring the operation of the protected device. The LPTBIT circuit is used during systemtest to electrically trigger the
latchup function by drawing current through the power switch/current sensor blocks sufficient to trigger the LPT
TM
pro-
tection.
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