LM4863 datasheet(4/16 Pages) NSC

4 / 16 page

Electrical Characteristics for Bridged-Mode Operation (Notes 3, 4) (Continued)

The following specifications apply for V

DD= 5V unless otherwise specified. Limits apply for TA= 25˚C.

Symbol

Parameter

Conditions

LM4863

Units

(Limits)

Typical

Limit

(Note

13)

(Note

14)

TALK

Channel Separation

f = 1 kHz, C

B = 1.0 µF

SNR

Signal To Noise Ratio

DD = 5V, PO = 1.1W, RL =8Ω

Electrical Characteristics for Single-Ended Operation (Notes 3, 4)

The following specifications apply for V

DD= 5V unless otherwise specified. Limits apply for TA= 25˚C.

Symbol

Parameter

Conditions

LM4863

Units

(Limits)

Typical

Limit

(Note

13)

(Note

14)

Output Offset Voltage

IN = 0V

mV (max)

Output Power

THD = 0.5%,f = 1 kHz, R

L = 32Ω

mW (min)

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

L = 8Ω

340

THD+N = 10%,f = 1 kHz, R

L = 8Ω

440

THD+N

Total Harmonic Distortion+Noise

V = −1, PO = 75 mW, 20 Hz ≤ f ≤ 20 kHz,

L = 32Ω

0.2

PSRR

Power Supply Rejection Ratio

B = 1.0 µF, VRIPPLE = 200 mV RMS,

f = 1 kHz

TALK

Channel Separation

f = 1 kHz, C

B = 1.0 µF

SNR

Signal To Noise Ratio

DD = 5V, PO = 340mW, RL =8Ω

Note 3: All voltages are measured with respect to the ground pins, 2, 7, and 15, unless otherwise specified.

Note 4: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is func-

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

antee 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 5: The

θJA given is for an MXA20A package whose exposed-DAP is soldered to an exposed 2in2 piece of 1 ounce printed circuit board copper.

Note 6: The

θJA given is for an MXA20A package whose exposed-DAP is not soldered to any copper.

Note 7: When driving 3

Ω loads from a 5V supply, the LM4863MTE must be mounted to the circuit board and forced-air cooled (450 linear-feet per minute).

Note 8: When driving 4

Ω loads from a 5V supply, the LM4863MTE must be mounted to the circuit board.

Note 9: Output power is measured at the device terminals.

Note 10: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θ JA, and the ambient temperature TA. The maximum

allowable power dissipation is PDMAX = (TJMAX −T A)/θJA. For the LM4863, TJMAX = 150˚C. For the θJAs for different packages, please see the Application Informa-

tion section or the Absolute Maximum Ratings section.

Note 11: Human body model, 100 pF discharged through a 1.5 k

Ω resistor.

Note 12: Machine model, 220 pF–240 pF discharged through all pins.

Note 13: Typicals are measured at 25˚C and represent the parametric norm.

Note 14: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).

Note 15: The quiescent power supply current depends on the offset voltage when a practical load is connected to the amplifier.

Truth Table for Logic Inputs

SHUTDOWN

HP-IN

LM4863 MODE

Low

Bridged

Low

High

Single-Ended

High

Low

LM4863 Shutdown

High

LM4863 Shutdown

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