LM4882 datasheet(3/12 Pages) NSC

3 / 12 page

Electrical Characteristics (Notes 1, 2) (Continued)

The following specifications apply for V

DD = 3V unless otherwise specified. Limits apply for TA = 25˚C.

Symbol

Parameter

Conditions

LM4882

Units

(Limits)

Typical

(Note 5)

Limit

(Note 6)

THD + N

Total Harmonic Distortion + Noise

L =8Ω,P O = 70 mWrms;

0.25

L =32Ω,PO = 30 mWrms;

0.3

f=1kHz

PSRR

Power Supply Rejection Ratio

pin3 = 2.5V, V ripple = 200 mVrms,

f = 120 Hz

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 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 P DMAX =(TJMAX −TA)/θJA. For the LM4882, TJMAX = 150˚C, and the typical junction-to-ambient thermal resistance, when board

mounted, is 210˚C/W for the MUA08A Package and 170˚C/W for the M08A Package.

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

Ω resistor.

Note 5: Typicals are measured at 25˚C and represent the parametric norm.

Note 6: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).

External Components Description

(Refer to

Figure 1)

Components

Functional Description

1. R

Inverting input resistance which sets the closed-loop gain in conjunction with R

f. This resistor also forms a

high pass filter with C

i at fc =1/(2πRiCi).

2. C

Input coupling capacitor which blocks the DC voltage at the amplifier’s input terminals. Also creates a

highpass filter with R

i at fc =1/(2πRiC i). Refer to the section, Proper Selection of External Components,

for an explanation of how to determine the values of C

3. R

Feedback resistance which sets closed-loop gain in conjunction with R

4. C

Supply bypass capacitor which provides power supply filtering. Refer to the Application Information section

for proper placement and selection of the supply bypass capacitor.

5. C

Bypass pin capacitor which provides half-supply filtering. Refer to the section, Proper Selection of External

Components, for information concerning proper placement and selection of C

6. C

Output coupling capacitor which blocks the DC voltage at the amplifier’s output. Forms a high pass filter wth

L at fO =1/(2πRLC O).

Typical Performance Characteristics

THD+N vs Frequency

DS100030-26

THD+N vs Frequency

DS100030-9

THD+N vs Frequency

DS100030-10

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