LM4940 datasheet(3/14 Pages) NSC

3 / 14 page

Absolute Maximum Ratings (Notes 1, 2)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Supply Voltage (pin 6, referenced

to GND, pins 4 and 5)

18.0V

Storage Temperature

−65˚C to +150˚C

Input Voltage

pins 3 and 7

−0.3V to V

DD + 0.3V

pins 1, 2, 8, and 9

−0.3V to 9.5V

Power Dissipation (Note 3)

Internally limited

ESD Susceptibility (Note 4)

2000V

ESD Susceptibility (Note 5)

200V

Junction Temperature

150˚C

Thermal Resistance

JC (TS)

4˚C/W

JA (TS) (Note 3)

20˚C/W

JC (TA)

4˚C/W

JA (TA) (Note 3)

20˚C/W

Operating Ratings

Temperature Range

MIN

≤ T

MAX

−40˚C

≤ T

≤ 85˚C

Supply Voltage

10V

≤ V

≤ 16V

Electrical Characteristics V

DD = 12V (Notes 1, 2)

The following specifications apply for V

DD = 12V, AV = 10, RL =4

Ω, f = 1kHz unless otherwise specified. Limits apply for T

A =

25˚C.

Symbol

Parameter

Conditions

LM4940

Units

(Limits)

Typical

(Note 6)

Limit

(Notes 7, 8)

Quiescent Power Supply Current

IN = 0V, IO = 0A, No Load

mA (max)

Shutdown Current

SHUTDOWN = GND (Note 9)

100

µA (max)

SDIH

Shutdown Voltage Input High

2.0

DD/2

V (min)

V (max)

SDIL

Shutdown Voltage Input Low

0.4

V (max)

Output Power

Single Channel

W (min)

THD+N = 1%

3.1

2.8

THD+N = 10%

4.2

DD = 14.4V, THD+N = 10%

6.0

THD+N

Total Harmomic Distortion + Noise

O = 1Wrms, AV = 10, f = 1kHz

0.15

Output Noise

A-Weighted Filter, V

IN = 0V,

Input Referred

µV

TALK

Channel Separation

O =1W

PSRR

Power Supply Rejection Ratio

RIPPLE = 200mVp-p,fRIPPLE =

1kHz

Note 1: All voltages are measured with respect to the GND pin, unless otherwise specified.

Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is

functional, but do not guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which

guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit

is given, however, the typical value is a good indication of device performance.

Note 3: 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 P DMAX =(TJMAX −TA)/ θJA or the given in Absolute Maximum Ratings, whichever is lower. For the LM4940 typical application (shown

in Figure 1) with VDD = 12V, RL =4Ω stereo operation the total power dissipation is 3.65W. θJA = 20˚C/W for both TO263 and TO220 packages mounted to 16in

heatsink surface area.

Note 4: Human body model, 100pF discharged through a 1.5 k

Ω resistor.

Note 5: Machine Model, 220pF–240pF discharged through all pins.

Note 6: Typicals are measured at 25˚C and represent the parametric norm.

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

Note 8: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.

Note 9: Shutdown current is measured in a normal room environment. The Shutdown pin should be driven as close as possible to GND for minimum shutdown

current.

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