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8170FSZ 查看數據表(PDF) - Intersil

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8170FSZ Datasheet PDF : 14 Pages
First Prev 11 12 13 14
EL8170, EL8173
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 is maintained 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 on page 2 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 Equation 4:
VOUT
=
1
+
R-R----G-F--⎠⎟⎞
× [1 (ERG + ERF + EG)] × VIN
(EQ. 4)
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:
= ±(ERG + ERF + EG(typical))
= ±(0.01 + 0.01 + 0.003)
= ±2.3%
(EQ. 5)
Disable/Power-Down
The EL8170 and EL8173 can be powered down reducing
the supply current to typically 2.9µA. When disabled, the
output is in a high impedance state. The active low EN bar
pin has an internal pull-down and hence can be left floating
and the in-amp enabled by default. When the EN bar is
connected to an external logic, the in-amp will power down
when the EN bar is pulled above 2V, and will power-on when
the EN bar is pulled below 0.8V.
Power Dissipation
It is possible to exceed the +150°C maximum junction
temperatures under certain load and power-supply
conditions. It is therefore important to calculate the
maximum junction temperature (TJMAX) for all applications
to determine if power supply voltages, load conditions, or
package type need to be modified to remain in the safe
operating area. These parameters are related in Equation 6:
TJMAX = TMAX + JAxPDMAXTOTAL)
(EQ. 6)
where:
• PDMAXTOTAL is the sum of the maximum power
dissipation of each amplifier in the package (PDMAX)
• PDMAX for each amplifier can be calculated as shown in
Equation 7:
PDMAX
=
2*VS × ISMAX + (VS
-
VOUTMAX
)
×
V-----O----U----T----M-----A----X--
RL (EQ.
7)
where:
• TMAX = Maximum ambient temperature
θJA = Thermal resistance of the package
• PDMAX = Maximum power dissipation of 1 amplifier
• VS = Supply voltage (Magnitude of V+ and V-)
• IMAX = Maximum supply current of 1 amplifier
• VOUTMAX = Maximum output voltage swing of the
application
• RL = Load resistance
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
13
FN7490.4
February 14, 2008

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