EL8171FSZ-T7 查看數據表（PDF） - Intersil
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EL8171FSZ-T7 Datasheet PDF : 14 Pages
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EL8171, EL8172
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:
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 EL8171 or EL8172
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 EL8171,
the total gain error would be:
= ±(ERG + ERF + EG(typical))
= ±(0.01 + 0.01 + 0.003)
(EQ. 5)
= ±2.3%
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 + (θJAxPDMAXTOTAL)
(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
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12
FN6293.5
July 27, 2009
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