LM4914MH datasheet(5/15 Pages) NSC

5 / 15 page

Electrical Characteristics: Bridged-Mode Operation (V

DD = 3V)

(Note 3)

The following specifications apply for the circuit shown in Figure 1, unless otherwise specified. Limits apply for T

A = 25˚C.

Symbol

Parameter

Conditions

LM4914

Units

(Limits)

Typical

Limit

(Note 8)

(Notes 9, 10)

Output Power (Note 11)

THD = 0.1%, f = 1kHz

V = 14dB, RL =8

Ω

330

THD+N

Total Harmonic Distortion + Noise

f = 1kHz

O = 250mW

0.2

Output Voltage Noise

B = 0.47µF, 20Hz < f < 20kHz

µV

RMS

Electrical Characteristics: SE Operation (V

DD = 3V)

(Note 3)

The following specifications apply for the circuit shown in Figure 1 and a measurement bandwidth of 20Hz to 80kHz, unless

otherwise specified. Limits apply for T

A = 25˚C.

Symbol

Parameter

Conditions

LM4914

Units

(Limits)

Typical

Limit

(Note 8)

(Notes 9, 10)

Output Power (Note 11)

THD+N = 0.1%, f = 1kHz,

L =32

Ω,A

V = 1.9dB (Note 12)

Output Voltage Noise

B = 0.47µF, 20Hz < f < 20kHz

µV

RMS

Note 1: When operating on a 5VDC, an LM4914MH that has been properly mounted to a circuit board will deliver 1W into 8Ω. See the Application Information

sections for further information concerning PCB layout suggestions to maximize the LM4914MH’s output power into an 8

Ω load.

Note 2: All voltages are measured with respect to the GND pin unless otherwise specified.

Note 3: 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 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 PDMAX =(TJMAX–TA)/θJA or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4914, see power derating

curves for additional information.

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

Ω resistor.

Note 6: Machine Model, 220pF–240pF discharged through all pins.

Note 7: The given

θJA is for an LM4914 packaged in an MH with the Exposed-DAP soldered to an exposed 2in2 area of 1oz printed circuit board copper.

Note 8: Typicals are measured at 25˚C and represent the parametric norm.

Note 9: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).

Note 10: Datasheet minimum and maximum specification limits are guaranteed by design, test, or statistical analysis.

Note 11: Output power is measured at the amplifier’s package pins.

Note 12: See Application Information section "Single-Ended Output Power Performance and Measurement Considerations" for more information.

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