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參數(shù)資料
| 型號： | LTC1291DIN8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | Single Chip 12-Bit Data Acquisition System |
| 中文描述： | 2-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數(shù)： | 18/20頁 |
| 文件大小： | 376K |
| 代理商： | LTC1291DIN8 |
18
LTC1291
U
S
A
O
PPLICATI
IU
U
Overvoltage Protection
Applying signals to the LTC1291’s analog inputs that
exceed the positive supply or that go below ground will
degrade the accuracy of the A/D and possibly damage the
device. For example this condition would occur if a signal
is applied to the analog inputs before power is applied to
the LTC1291. It can also happen if the input source is
operating from supplies of larger value than the LTC1291
supply. These conditions should be prevented either with
proper supply sequencing or by use of external circuitry to
clamp or current limit the input source.
There are two ways to protect the inputs. n Figure 13 diode
clamps from the inputs to V
CC
and GND are used. The
second method is to put resistors in series with the analog
inputs for current limiting. Limit the current to 15mA per
channel. The +IN input can accept a resistor value of 1k but
the –IN input cannot accept more than 250
when clocked
at its maximum clock frequency of 1MHz. If the LTC1291
is clocked at the maximum clock frequency and 250
is
not enough to current limit the input source then the clamp
diodes are recommended (Figures 14 and 15). The reason
for the limit on the resistor value is the MSB bit test is
affected by the value of the resistor placed at the –IN input
(see discussion on Analog Inputs and the typical perfor-
mance characteristics Maximum CLK Frequency vs Source
Resistance).
Because a unique input protection structure is used on the
digital input pins, the signal levels on these pins can
exceed the device V
CC
without damaging the device.
5V
LTC1291 F13
CH0
GND
D
IN
D
OUT
CLK
V
CC
(V
REF
)
CS
CH1
1N4148 DIODES
LTC1291
5V
LTC1291 F14
CH0
GND
D
IN
D
OUT
CLK
CS
CH1
250
1k
LTC1291
V
CC
(V
REF
)
5V
LTC1291 F15
CH0
GND
D
IN
D
OUT
CLK
CS
CH1
LTC1291
1N4148 DIODES
1k
V
CC
(V
REF
)
Figure 13. Overvoltage Protection for Inputs
Figure 14. Overvoltage Protection for Inputs
Figure 15. Overvoltage Protection for Inputs
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