LM4892 datasheet(4/22 Pages) NSC

4 / 22 page

Electrical Characteristics V

DD = 3.3V (Notes 1, 2)

The following specifications apply for V

DD = 3.3V, AV = 2, and 8

Ω load unless otherwise specified. Limits apply for T

A =

25˚C. (Continued)

Symbol

Parameter

Conditions

LM4892

Units

(Limits)

Typical

Limit

(Note 6)

(Note 7)

PSSR

Power Supply Rejection Ratio

ripple = 200mV sine p-p

60(f = 217Hz)

62 (f = 1kHz)

Electrical Characteristics V

DD = 2.6V

(Notes 1, 2)

The following specifications apply for V

DD = 2.6V, AV = 2, and 8

Ω load unless otherwise specified. Limits apply for T

A = 25˚C.

Symbol

Parameter

Conditions

LM4892

Units

(Limits)

Typical

Limit

(Note 6)

(Note 7)

Quiescent Power Supply Current

IN = 0V, Io = 0A, HP sense = 0V

2.6

mA (max)

IN = 0V, Io = 0A, HP sense = 2.6V

1.5

mA (max)

Shutdown Current

Vshutdown = GND (Note 8)

0.1

µA (max)

Output Power

THD = 1% (max), f = 1kHz,

L =8

Ω, HP Sense < 0.8V

0.25

THD = 1% (max), f = 1kHz,

L =4

Ω, HP Sense < 0.8V

0.28

THD = 1% (max), f = 1kHz, R

L =

Ω, HP Sense > 2.5V

HP Sense high input voltage

2.0

V (min)

HP Sense low input voltage

0.8

V (max)

THD+N

Total Harmonic Distortion+Noise

o = 0.1 Wrms; f = 1kHz 10Hz

≤

≤ 80kHz

0.1

PSSR

Power Supply Rejection Ratio

ripple = 200mV sine p-p

44(f = 217Hz)

44 (f = 1kHz)

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 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 or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4892, see power derating

currents for additional information.

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

Ω resistor.

Note 5: Machine Model, 220pF–240pF discharged through all pins.

Note 6: Typicals are measured at 25˚C and represent the parametric norm.

Note 7: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.

Note 8: For micro SMD only, shutdown current is measured in a Normal Room Environment. Exposure to direct sunlight will increase ISD by a maximum of 2µA.

Note 9: The Exposed-DAP of the LDA10B package should be electrically connected to GND or an electrically isolated copper area. The LM4892LD demo board

(views featured in the Application Information section) has the Exposed-DAP connected to GND with a PCB area of 353mils x 86.7mils (8.97mm x 2.20mm) on

the copper top layer and 714.7mils x 368mils (18.15mm x 9.35mm) on the copper bottom layer.

External Components Description

(Figure 1)

Components

Functional Description

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/(2

π R

iCi).

Input coupling capacitor which blocks the DC voltage at the amplifiers input terminals. Also creates a

highpass filter with R

i at fc = 1/(2

π R

iCi). Refer to the section, Proper Selection of External Components,

for an explanation of how to determine the value of C

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

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