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參數(shù)資料
| 型號： | LTC6800 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 運動控制電子 |
| 英文描述： | Single Supply, Rail-to-Rail, Low Cost Instrumentation Amplifier |
| 中文描述： | 單電源，軌至軌，低成本儀表放大器 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 208K |
| 代理商： | LTC6800 |
LTC6800
9
6800fa
APPLICATIU
Input Current
Whenever the differential input V
IN
changes, C
H
must be
charged up to the new input voltage via C
S
. This results in
an input charging current during each input sampling
period. Eventually, C
H
and C
S
will reach V
IN
and, ideally,
the input current would go to zero for DC inputs.
In reality, there are additional parasitic capacitors which
disturb the charge on C
S
every cycle even if V
IN
is a DC
voltage. For example, the parasitic bottom plate capacitor
on C
S
must be charged from the voltage on the REF pin to
the voltage on the –IN pin every cycle. The resulting input
charging current decays exponentially during each input
sampling period with a time constant equal to R
S
C
S
.
If the
voltage disturbance due to these currents settles before
the end of the sampling period, there will be no errors
due to source resistance or the source resistance mis-
match between –IN and +IN. With R
S
less than 10k, no
DC errors occur due to this input current.
W
U
U
In the Typical Performance Characteristics section of this
data sheet, there are curves showing the additional error
from nonzero source resistance in the inputs. If there are
no large capacitors across the inputs, the amplifier is less
sensitive to source resistance and source resistance mis-
match. When large capacitors are placed across the in-
puts, the input charging currents described above result in
larger DC errors, especially with source resistor mis-
matches.
Power Supply Bypassing
The LTC6800 uses a sampled data technique and therefore
contains some clocked digital circuitry. It is therefore sen-
sitive to supply bypassing. A 0.1
μ
F ceramic capacitor must
be connected between Pin8 (V
+
) and Pin 4 (V
–
) with leads
as short as possible.
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