8170FSZ 查看數據表（PDF） - Renesas Electronics
零件编号
产品描述 (功能)
生产厂家
8170FSZ
Renesas Electronics
8170FSZ Datasheet PDF : 14 Pages
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EL8170, EL8173
Pin Descriptions
EL8170
1
2
3
4
5
8
7
6
EL8173
1
2
3
4
5
8
7
6
PIN NAME
DNC
IN-
IN+
V-
FB-
FB+
V+
VOUT
EQUIVALENT CIRCUIT
PIN FUNCTION
Do Not Connect; Internal connection - Must be left floating.
Circuit 1A, Circuit 1B
Circuit 1A, Circuit 1B
High impedance input terminals. The EL8170 input circuit is shown in Circuit 1A,
and the EL8173 input circuit is shown in Circuit 1B.
The EL8173: to avoid offset drift, it is recommended that the terminals are not
overdriven beyond 1V and the input current must never exceed 5mA.
Circuit 3
Negative supply terminal.
Circuit 1A, Circuit 1B
Circuit 1A, Circuit 1B
High impedance feedback terminals. The EL8170 input circuit is shown in
Circuit 1A, and the EL8173 input circuit is shown in Circuit 1B.
The EL8173: to avoid offset drift, it is recommended that the terminals are not
overdriven beyond 1V and the input current must never exceed 5mA.
Circuit 3
Positive supply terminal.
Circuit 2
Output voltage.
V+
IN-
IN+
FB-
FB+
V-
CIRCUIT 1A
V+
IN-
IN+
FB-
FB+
V-
CIRCUIT 1B
V+
OUT
V-
CIRCUIT 2
V+
CAPACITIVELY
COUPLED
ESD CLAMP
V-
CIRCUIT 3
Description of Operation and
Applications Information
Product Description
The EL8170 and EL8173 are micropower instrumentation
amplifiers (in-amps) which deliver rail-to-rail input amplification and
rail-to-rail output swing on a single +2.4V to +5.5V supply. The
EL8170 and EL8173 also deliver excellent DC and AC specifications
while consuming only 65µA typical supply current. The EL8170 and
EL8173 provides an independent pairs of feedback terminals to set
the gain and to adjust output level, these in-amps achieve high
common-mode rejection ratio regardless of the tolerance of the gain
setting resistors. The EL8173 is internally compensated for a
minimum closed loop gain of 10 or greater, well suited for moderate
to high gains. For higher gains, the EL8170 is internally
compensated for a minimum gain of 100.
Input Protection
All input and feedback terminals of the EL8170 and EL8173 have
internal ESD protection diodes to both positive and negative
supply rails, limiting the input voltage to within one diode drop
beyond the supply rails. The inverting inputs and FB- have ESD
diodes to the V-rail, and the non-inverting inputs and FB+
terminals have ESD diodes to the V+ rail. The EL8170 has
FN7490 Rev 8.00
August 11, 2015
additional back-to-back diodes across the input terminals and
also across the feedback terminals. If overdriving the inputs is
necessary, the external input current must never exceed 5mA. On
the other hand, the EL8173 has no clamps to limit the
differential voltage on the input terminals allowing higher
differential input voltages at lower gain applications. It is
recommended however, that the input terminals of the EL8173
are 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 the 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 to move the
common-mode input of the in-amps to achieve symmetrical input
voltage.
Page 10 of 14
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