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參數資料
| 型號： | 7805ALPRPFS |
| 廠商： | MAXWELL TECHNOLOGIES |
| 元件分類： | ADC |
| 英文描述： | 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, DFP28 |
| 封裝： | RAD-PAK, LDFP-28 |
| 文件頁數： | 4/34頁 |
| 文件大?。?/td> | 605K |
| 代理商： | 7805ALPRPFS |
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Memory
PRELIMINARY
12
All data sheets are subject to change without notice
2001 Maxwell Technologies
All rights reserved.
16-Bit Latchup Protected ADC
7805ALP
12.19.01 Rev 6
1000583
and LPT Timing 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 from the 7805A are invalid. The STATUS signal HIGH
indicates that power is removed from the 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 sec 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.
FIGURE 7. LPT TEST CIRCUIT
TABLE 17. LPT OPERATING CHARACTERISTICS
PARAMETER
MIN
TYP
MAX
UNITS
Supply threshold current - ITHR
56
77
99
mA
Protection time (IS Peak = .2A) - TPT
--
1
--
sec
Input tri-state time - TIOFF
--
100
nsec
Status instability time - TINST
--
10
sec
Supply recovery time (IS Peak = .2A) - TSR
25
50
100
sec
Functional recovery time (IS Peak = .2A) - TFR
--
TSR + 25
--
sec
8-Bit accuracy recovery time (IS Peak = .2A) - T8R
--
75
--
msec
12-Bit accuracy recovery time (IS Peak = .2A) - T12R
--
250
--
msec
Full accuracy recovery time (IS Peak - .2A) - TFAR
--
425
--
msec
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