LM4952 datasheet(4/20 Pages) NSC

4 / 20 page

Electrical Characteristics for Volume Control (Notes 1, 2)

The following specifications apply for V

DD = 12V, AV = 20dB (nominal), and TA = 25˚C unless otherwise noted.

Symbol

Parameter

Conditions

LM4952

Units

(Limits)

Typical

(Note 6)

Limit

(Note 7)

VOL

max

Gain

DC-VOL = Full scale, No Load

VOL

min

Gain

DC-VOL = +1LSB, No Load

-46

Mute Attenuation

DC-VOL = 0V, No Load

dB (min)

Note 1: All voltages are measured with respect to the GND 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 given in Absolute Maximum Ratings, whichever is lower. For the LM4952 typical application (shown

in Figure 1) with VDD = 12V, RL =4Ω stereo operation the total power dissipation is 3.65W. θJA = 20˚C/W for the TO263 package mounted to 16in

2 heatsink surface

area.

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

Note 8: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.

Note 9: Shutdown current is measured in a normal room environment. The Shutdown pin should be driven as close as possible to GND for minimum shutdown

current.

External Components Description Refer to Figure 1

Components

Functional Description

1. C

This is the input coupling capacitor. It blocks DC voltage at the amplifier’s inverting input. C

IN and RIN

create a highpass filter. The filter’s cutoff frequency is f

C =1/(2

πR

INCIN). Refer to the SELECTING

EXTERNAL COMPONENTS, for an explanation of determining C

IN’s value.

2. C

The supply bypass capacitor. Refer to the POWER SUPPLY BYPASSING section for information about

properly placing, and selecting the value of, this capacitor.

3. C

BYPASS

This capacitor filters the half-supply voltage present on the BYPASS pin. Refer to the Application section,

SELECTING EXTERNAL COMPONENTS, for information about properly placing, and selecting the value

of, this capacitor.

LM4952 Datasheet(PDF) 4 Page - National Semiconductor (TI)

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