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參數資料
| 型號： | 7805ALP |
| 廠商： | Maxwell Technologies, Inc |
| 英文描述： | 16-Bit Latchup Protected ADC |
| 中文描述： | 16位ADC的閉鎖保護 |
| 文件頁數： | 12/18頁 |
| 文件大?。?/td> | 262K |
| 代理商： | 7805ALP |
M
12
All data sheets are subject to change without notice
2005 Maxwell Technologies
All rights reserved.
16-Bit Latchup Protected ADC
7805ALP
01.10.05 Rev 9
F
IGURE
6. T
YPICAL
7805A C
IRCUIT
WITH
8-
BIT
B
US
I
NTERFACE
Testing the 7805A Latchup Protection Circuitry
The DECPLNG pin provides direct access to the 7805ALP converter supply pins for attaching external decoupling
capacitor(s) to ground. This pin can also be used to test the LPT
operation by sinking a pulsed current load to
ground as shown in the test circuit in Figure 5 and as described in the LPT Operating Characteristics Table (Table 17)
and LPT Timng diagram(Figure 7). This test approximates the operation of the 7805A in response to a single event
latchup and recovery.
During the time that the power is cycled, output signals and data fromthe 7805A are invalid. The STATUS signal HIGH
indicates that power is removed fromthe ADS7805 die. All input pins must be driven low or tri-stated. When this signal
is low power is applied to the ADS7805 die. The STATUS signal can be used to measure the supply recovery time.
The status signal can exhibit multiple transitions when power is re-applied and the decoupling capacitors are charged.
The duration and number of transitions is dependent on the amount of capacitance used. The supply recovery time
interval starts when the supply current rises (causing STATUS to go high) and ends when the STATUS signal stabi-
lizes low again.
Within the functional recovery time interval (typically 25 μsec after the LPT circuit reapplies power), the normal func-
tional operation of the converter is restored with less than 5% full scale error. Additional settling time is then required to
return to full accurate operation. Defined recovery time intervals indicate that time to recover first is within 8-bit accu-
racy, then within 12 bit accuracy, and finally full 16-bit accuracy. These recovery times are primarily due to the single
event and power cycling effects on the reference circuits and the settling times of their respective filter capacitors.
T
ABLE
17. LPT
O
PERATING
C
HARACTERISTICS
P
ARAMETER
M
IN
T
YP
M
AX
U
NITS
Supply threshold current - ITHR
Protection time (IS Peak = .2A) - TPT
Input tri-state time - TIOFF
56
--
--
77
1
--
99
--
100
mA
μsec
nsec
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