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參數(shù)資料
| 型號： | LTC1294 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Single Chip 12-Bit Data Acquisition System(單片，12位數(shù)據(jù)采集系統(tǒng)) |
| 中文描述： | 單芯片12位數(shù)據(jù)采集系統(tǒng)（單片，12位數(shù)據(jù)采集系統(tǒng)） |
| 文件頁數(shù)： | 24/28頁 |
| 文件大?。?/td> | 403K |
| 代理商： | LTC1294 |
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24
LTC1293/LTC1294/LTC1296
U
S
A
O
PPLICATI
U
U
This means four channels can handle 7mA of input current
each. Reducing CLK frequency from a maximum of 1MHz
(See typical performance characteristics curves Maxi-
mum CLK Frequency vs Source Resistance and Sample
and Hold Acquisition Time vs Source Resistance) allows
the use of larger current limiting resistors. The “+” input
can accept a resistor value of 1k
but the “–” input cannot
accept more than 250
when the maximum clock fre-
quency of 1MHz is used. If the LTC1293/4/6 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 20a and 20b). 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 “–” input (see
discussion on Analog Inputs and the typical performance
characteristics curve Maximum CLK Frequency vs Source
Resistance).
If V
CC
and V
REF
are not tied together, then V
CC
should be
turned on first, then V
REF
. If this sequence cannot be met
connecting a diode from V
REF
to V
CC
is recommended (see
Figure 21).
For dual supplies (bipolar mode) placing two Schottky
diodes from V
CC
and V
–
to ground (Figure 22) will prevent
Figure 20a. Overvoltage Protection for Inputs
Figure 19. Overvoltage Protection for Inputs
Figure 22. Power Supply Reversal
Figure 21
power supply reversal from occuring when an input source
is applied to the analog MUX before power is applied to the
device. Power supply reversal occurs, for example, if the
input is pulled below V
–
. V
CC
will then pull a diode drop
below ground which could cause the device not to power
up properly. Likewise, if the input is pulled above V
CC
, V
–
will be pulled a diode drop above ground. If no inputs are
present on the MUX, the Schottky diodes are not required
if V
–
is applied first then V
CC
.
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.
Figure 20b. Overvoltage Protection for Inputs
+5V
LTC1293 F19
DGND
V
–
AGND
V
CC
1N4148 DIODES
LTC1293/4/6
–5V
+5V
LTC1293 F20a
+
DGND
V
–
AGND
V
CC
–
250
1k
LTC1293/4/6
–5V
+5V
LTC1293 F20b
+
DGND
V
–
AGND
V
CC
–
LTC1293/4/6
1N4148 DIODES
1k
–5V
+5V
LTC1293 F22
DGND
AGND
V
CC
LTC1293/4/6
1N5817
–5V
V
–
1N5817
+5V
LTC1293 F21
DGND
AGND
V
CC
LTC1293/4/6
1N4148
+5V
REF
+
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