LM4831 datasheet(3/12 Pages) NSC

3 / 12 page

Electrical Characteristics (Continued)

(Notes 1, 2) The following specifications apply for V

DD = 5V, RL =8Ω andf=1 kHz, unless otherwise specified. Distortion

measurements represent the full audio chain from Input A of each channel to their respective output. Limits apply for

A = 25˚C.

Symbol

Parameter

Conditions

LM4831

Units

(Limits)

Typical

(Note

Limit

(Note

Microphone Amplifier

THD

Total Harmonic Distortion

L =10kΩ,VIN =1VRMS

0.15

Noise

Input Referred Noise

A-−weighted Filter

µV (max)

TALK

Crosstalk

Amplifier Bridged Output, f = 1kHz,

O = 1W, RL-mic = 20kΩ

Other Audio Characteristics

THD

Total Harmonic Distortion

L =20kΩ,VIN =1VRMS

Line Out

0.15

0.5

% (max)

Equalizer Out

0.01

Noise

Input Referred Noise

A-weighted filter, Line Out

100

µV (max)

Channel Path Gain

Line Out

±0.1

±0.7

dB (max)

Equalizer Out

±0.1

±0.6

dB (max)

MUX Out

−0.25

−0.85,

+0.3

Stereo Tracking Error

Line Out

±0.1

±0.5

dB (max)

Digital Inputs and Outputs

Input Low Voltage

1.0

V (max)

Input High Voltage

4.0

V (min)

Output Low Voltage

0.5

V (max)

Output High Voltage

3.5

V (min)

Note 1: All voltages are measured with respect to the ground pins, 12, 17, 20, and 44, 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 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 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 PDMAX =(TJMAX −TA)/θJA. For the LM4831, TJMAX = 150˚C, and the typical junction-to-ambient thermal resistance, when board

mounted, is 62˚C/W assuming the VEF44A package.

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

Ω resistor.

Note 5: Machine Model, 220 pF–240 pF 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).

Digital Inputs Pin Truth Table

Pin Name

LM4831 State

PWRDWN

HPIN

DSIN

Bridged Outputs Active

Equalizer In/Out Active

Line-Outs Active

X(Note 8)

Single-Ended Outputs Active

Shutdown

Note 8: “X” means that the state of that pin does not matter in that particular input combination.

LM4831 Datasheet(PDF) 3 Page - National Semiconductor (TI)

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