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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(yè)數(shù)： | 4/14頁(yè) |
| 文件大?。?/td> | 707K |
| 代理商： | EL8170IS |
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12
FN7490.1
March 9, 2006
higher differential input voltages at lower gain applications. It
is recommended however, that the input terminals of the
EL8173 is not overdriven beyond 1V to avoid offset drift. An
external series resistor may be used as an external
protection to limit excessive external voltage and current
from damaging the inputs.
Input Stage and Input Voltage Range
The input terminals (IN+ and IN-) of the EL8170 and EL8173
are single differential pair bipolar PNP devices aided by an
Input Range Enhancement Circuit to increase the headroom
of operation of the common-mode input voltage. The
feedback terminals (FB+ and FB-) also have a similar
topology. As a result, the input common-mode voltage range
of both the EL8170 and EL8173 is rail-to-rail. These in-amps
are able to handle input voltages that are at or slightly
beyond the supply and ground making these in-amps well
suited for single 5V or 3.3V low voltage supply systems.
There is no need then to move the common-mode input of
the in-amps to achieve symmetrical input voltage.
Input Bias Cancellation/Compensation
Inside the EL8170 and EL8173 is an Input Bias
Cancellation/Compensation Circuit for both the input and
feedback terminals (IN+, IN-, FB+ and FB-), achieving a low
input bias current all throughout the input common-mode
range and the operating temperature range. While the PNP
bipolar input stages are biased with an adequate amount of
biasing current for speed and increased noise performance,
the Input Bias Cancellation/Compensation Circuit sinks most
of the base current of the input transistor leaving a small
portion as input bias current, typically 500pA. In addition, the
Input Bias Cancellation/Compensation Circuit maintains a
smooth and flat behavior of input bias current over the
common mode range and over the operating temperature
range. The Input Bias Cancellation/Compensation Circuit
operates from input voltages of 10mV above the negative
supply to input voltages slightly above the positive supply.
See Average Input Bias Current vs Common-Mode Input
Voltage in the performance curves section.
Output Stage and Output Voltage Range
A pair of complementary MOSFET devices drives the output
VOUT to within a few millivolts of the supply rails. At a
100k
load, the PMOS sources current and pulls the output
up to 4mV below the positive supply, while the NMOS sinks
current and pulls the output down to 4mV above the negative
supply, or ground in the case of a single supply operation.
The current sinking and sourcing capability of the EL8170
and EL8173 are internally limited to 29mA.
Gain Setting
VIN, the potential difference across IN+ and IN-, is replicated
(less the input offset voltage) across FB+ and FB-. The
obsession of the EL8170 and EL8173 in-amp is to maintain
the differential voltage across FB+ and FB- equal to IN+ and
IN-; (FB+ - FB-) = (IN+ - IN-). Consequently, the transfer
function can be derived. The gain of the EL8170 and EL8173
is set by two external resistors, the feedback resistor RF, and
the gain resistor RG.
In Figure 41, the FB+ pin and one end of resistor RG are
connected to GND. With this configuration, the above gain
equation is only true for a positive swing in VIN; negative
input swings will be ignored and the output will be at ground.
Reference Connection
Unlike a three-op amp instrumentation amplifier, a finite
series resistance seen at the REF terminal does not degrade
the EL8170 and EL8173's high CMRR performance
eliminating the need for an additional external buffer
amplifier. Figure 42 uses the FB+ pin to provide a high
impedance REF terminal.
.
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
FIGURE 41. GAIN IS SET BY TWO EXTERNAL RESISTORS,
RF AND RG
VOUT
1
RF
RG
--------
+
VIN
=
FIGURE 42. GAIN SETTING AND REFERENCE CONNECTION
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
REF
2.9V to 5V
R1
R2
VOUT
1
RF
RG
--------
+
VIN
()
1
RF
RG
--------
+
VREF
()
+
=
EL8170, EL8173
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