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參數(shù)資料
| 型號(hào)： | EL8170IS |
| 廠商： | INTERSIL CORP |
| 元件分類： | 測(cè)量放大器 |
| 英文描述： | microPower, Single-Supply, CMOS Instrumentation Amplifier |
| 中文描述： | INSTRUMENTATION AMPLIFIER, 250 uV OFFSET-MAX, 192 MHz BAND WIDTH, PDSO8 |
| 封裝： | PLASTIC, MS-012, SOP-8 |
| 文件頁數(shù)： | 5/14頁 |
| 文件大?。?/td> | 707K |
| 代理商： | EL8170IS |
13
FN7490.1
March 9, 2006
The FB+ pin is used as a REF terminal to center or to adjust
the output. Because the FB+ pin is a high impedance input,
an economical resistor divider can be used to set the voltage
at the REF terminal without degrading or affecting the CMRR
performance. Any voltage applied to the REF terminal will
shift VOUT by VREF times the closed loop gain, which is set
by resistors RF and RG. See Figure 42.
The FB+ pin can also be connected to the other end of
resistor, RG. See Figure 43. Keeping the basic concept that
the EL8170 and EL8173 in-amps maintain constant
differential voltage across the input terminals and feedback
terminals (IN+ - IN- = FB+ - FB-), the transfer function of
Figure 43 can be derived.
A finite resistance RS in series with the VREF source, adds
an output offset of VIN*(RS/RG). As the series resistance Rs
approaches zero, the gain equation is simplified to the above
equation for Figure 43. VOUT is simply shifted by an amount
VREF.
External Resistor Mismatches
Because of the independent pair of feedback terminals
provided by the EL8170 and EL8173, the CMRR is not
degraded by any resistor mismatches. Hence, unlike a three
op amp and especially a two op amp in-amp, the EL8170
and EL8173 reduce the cost of external components by
allowing the use of 1% or more tolerance resistors without
sacrificing CMRR performance. The EL8170 and EL8173
CMRR will be 108dB regardless of the tolerance of the
resistors used.
Gain Error and Accuracy
The EL8173 has a Gain Error, EG, of 0.2% typical. The
EL8170 has an EG of 0.3% typical. The gain error indicated
in the electrical specifications table is the inherent gain error
of the EL8170 and EL8173 and does not include the gain
error contributed by the resistors. There is an additional gain
error due to the tolerance of the resistors used. The resulting
non-ideal transfer function effectively becomes:
Where:
ERG = Tolerance of RG
ERF = Tolerance of RF
EG = Gain Error of the EL8170 or EL8173
The term [1 - (ERG +ERF +EG)] is the deviation from the
theoretical gain. Thus, (ERG +ERF +EG) is the total gain
error. For example, if 1% resistors are used for the EL8170,
the total gain error would be:
Disable/Power-Down
The EL8170 and EL8173 can be powered down reducing
the supply current to typically 2.9A. When disabled, the
output is in a high impedance state. The active low ENABLE
bar pin has an internal pull down and hence can be left
floating and the in-amp enabled by default. When the
ENABLE bar is connected to an external logic, the in-amp
will power down when ENABLE bar is pulled above 2V, and
will power on when ENABLE bar is pulled below 0.8V.
FIGURE 43. REFERENCE CONNECTIONWITH AN AVAILABLE
VREF
1
3
2
8
5
4
7
6
+
-
+
-
IN+
IN-
FB+
FB-
VS+
VS-
EN
2.9V to 5V
RF
RG
VOUT
EN_BAR
EL8170/3
VCM
VIN/2
VREF
VOUT
1
RF
RG
--------
+
VIN
()
VREF
()
+
=
VOUT
1
RF
RG
--------
+
1ERG ERF EG
++
()
–
[] VIN
×
=
ERG ERF EG typical
()
++
()
±
=
0.01 0.01 0.003
++
()
±
=
2.3%
±
=
EL8170, EL8173
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