LM4731 datasheet(4/16 Pages) NSC

4 / 16 page

Electrical Characteristics (Notes 1, 2) (Continued)

The following specifications apply for V

+ = +22V, V- = −22V and R

L =8

Ω unless otherwise specified. Limits apply for T

A =

25˚C.

Symbol

Parameter

Conditions

LM4731

Units

(Limits)

Typical

Limit

(Note 6)

(Notes 7, 8)

Mute Low Input Voltage

Not in Mute Mode (Play)

0.8

V (max)

Mute High Input Voltage

In Mute Mode

2.0

2.5

V (min)

Note 1: All voltages are measured with respect to the ground 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 a device’s performance.

Note 3: The maximum power dissipation must be de-rated at elevated temperatures and is dictated by TJMAX, θJC, and the ambient temperature TA. The maximum

allowable power dissipation is PDMAX =(TJMAX -TA)/ θJC or the number given in the Absolute Maximum Ratings, whichever is lower. For the LM4731, TJMAX = 150˚C

and the typical

θJC is 1.5˚C/W for the TA15A package . Refer to the Thermal Considerations section for more information.

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

Ω resistor.

Note 5: Machine Model: a 220pF - 240pF discharged through all pins.

Note 6: Typical specifications are sepcified at 25˚C and represent the parametric norm.

Note 7: Tested 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: The operating junction temperature maximum is 150˚C. However, the instantaneous Safe Operating Area temperature is 250˚C.

Note 10: V- must have at least -9V at its pin with reference to GND in order for the under-voltage protection circuitry to be disabled. In addition, the voltage

differential between V+ and V- must be greater than 14V.

Note 11: The feedback compensation network limits the bandwidth of the closed-loop response causing the skew rate to be reduced by the high frequency roll-off.

Without feedback compensation the slew rate is typically larger.

Note 12: The LM4731TA package TA15A is a non-isolated package setting the tab of the device and the heat sink to V-potential when the LM4731TA is directly

mounted to the heat sink using only thermal compound. If a mica washer is used in addition to thermal compound,

θCS (case to sink) is increased, but the heat sink

will be electrically isolated from V-.

Bridged Amplifier Application Circuit

20060305

FIGURE 2. Bridged Amplifier Application Circuit

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