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參數(shù)資料
| 型號(hào)： | LTC6800HDD |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Single Supply, Rail-to-Rail, Low Cost Instrumentation Amplifier |
| 中文描述： | INSTRUMENTATION AMPLIFIER, 100 uV OFFSET-MAX, PDSO8 |
| 封裝： | 3 X 3 MM, PLASTIC, MO-229-WEED, DFN-8 |
| 文件頁(yè)數(shù)： | 8/12頁(yè) |
| 文件大?。?/td> | 208K |
| 代理商： | LTC6800HDD |
LTC6800
8
6800fa
where V
+IN
and V
–IN
are the voltages of the +IN and –IN
pins respectively, V
REF
is the voltage at the REF pin and V
+
is the positive supply voltage.
For example, with a 3V single supply and a 0V to 100mV
differential input voltage, V
REF
must be between 0V and
1.6V.
Settling Time
The sampling rate is 3kHz and the input sampling period
during which C
S
is charged to the input differential voltage
V
IN
is approximately 150
μ
s. First assume that on each
input sampling period, C
S
is charged fully to V
IN
. Since
C
S
= C
H
(= 1000pF), a change in the input will settle to N
bits of accuracy at the op amp noninverting input after N
clock cycles or 333
μ
s(N). The settling time at the OUT pin
is also affected by the settling of the internal op amp.
Since the gain bandwidth of the internal op amp is
typically 200kHz, the settling time is dominated by the
switched capacitor front end for gains below 100 (see
Typical Performance Characteristics).
APPLICATIU
Theory of Operation
The LTC6800 uses an internal capacitor (C
S
) to sample a
differential input signal riding on a DC common mode
voltage (see Block Diagram). This capacitor’s charge is
transferred to a second internal hold capacitor (C
H
) trans-
lating the common mode of the input differential signal to
that of the REF pin. The resulting signal is amplified by a
zero-drift op amp in the noninverting configuration. The
RG pin is the negative input of this op amp and allows
external programmability of the DC gain. Simple filtering
can be realized by using an external capacitor across the
feedback resistor.
W
U
U
Input Voltage Range
The input common mode voltage range of the LTC6800 is
rail-to-rail. However, the following equation limits the size
of the differential input voltage:
V
–
≤
(V
+IN
– V
–IN
) + V
REF
≤
V
+
– 1.3
–
+
–
+
V
D
V
+IN
V
–IN
3
8
5V
4
5
6
7
2
6800 F01
0V < V
+IN
< 5V
0V < V
–IN
< 5V
0V < V
D
< 3.7V
V
OUT
= V
D
SINGLE SUPPLY, UNITY GAIN
Figure 1
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