LMC1982 datasheet(4/14 Pages) NSC

4 / 14 page

Electrical Characteristics (Continued)

Note 4: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θJA, and the ambient temperature TA. The maximum

allowable power dissipation is PD = (TJMAX −TA)/θJA or the number given in the Absolute Maximum Ratings, whichever is lower. For the LMC1982CIN, TJMAX =

+125˚C, and the typical junction-to-ambient thermal resistance, when board mounted, is 67˚C/W.

Note 5: Human body model; 100 pF discharged through a 1.5 k

Ω resistor.

Note 6: Typicals are at TJ = +25˚C and represent the most likely parametric norm.

Note 7: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).

Note 8: The Input-Input Isolation is tested by driving one input and measuring the output when the undriven input are selected.

Note 9: The Volume Step Size is defined as the change in attenuation between any two adjacent volume attenuation settings. The nominal Volume Step Size is 2 dB.

Note 10: Enhanced Stereo Cross Coupling is a measure of the ratio between the undriven right channel output signal and the driven left channel output signal. It

is measured by driving the left inputs with a 300 mVrms signal while the right inputs are grounded.

Typical Performance Characteristics

Supply Current

vs Supply Voltage

DS011028-13

Output Voltage

vs Supply Voltage

DS011028-14

THD vs

Load Impedance

DS011028-15

THD vs

Load Impedance

DS011028-16

CCIR Output Noise

vs Volume Setting

DS011028-17

Channel Separation

vs Frequency

DS011028-18

THD vs V

OUT Constant)

DS011028-19

THD vs Frequency

DS011028-20

Mute Gain

vs Frequency

DS011028-21

LMC1982 Datasheet(PDF) 4 Page - National Semiconductor (TI)

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