EL8171FSZ datasheet(12/14 Pages) RENESAS

12 / 14 page

EL8171, EL8172

FN6293 Rev 6.00

Page 12 of 14

October 9, 2015

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 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:

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:

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:

where:

•TMAX = Maximum ambient temperature

•

JA = 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

VOUT

--------







1ERG ERF EG



–

 V



(EQ. 4)

ERG ERF EG typical





0.01 0.01 0.003





2.3%



(EQ. 5)

TJMAX

TMAX JAxPDMAXTOTAL



(EQ. 6)

PDMAX

2*VS ISMAX VS



- VOUTMAX

VOUTMAX

----------------------------



(EQ. 7)

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