LM4859_05 datasheet(9/29 Pages) NSC

9 / 29 page

Control Interface Electrical Characteristics (Notes 1, 2) (Continued)

The following specifications apply for V

DD = 5V and VDD = 3V and 2.5V

≤ I2CV

≤ 5.5V, unless otherwise specified. Limits

apply for T

A = 25˚C.

Symbol

Parameter

Conditions

LM4859

Units

(Limits)

Typical

(Note 6)

Limits (Notes

7, 8)

Digital Input High Voltage

0.7 x I

2CVDD

V (min)

Digital Input Low Voltage

0.3 x I

2CV

V (max)

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 number given in Absolute Maximum Ratings, whichever is lower. For the LM4859 operating in Mode

3, 8, or 13 with VDD =5V, 8Ω stereo loudspeakers and 32Ω stereo headphones, the total power dissipation is 1.348W. θJA = 62˚C/W.

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 and supply current are measured in a normal room environment. All digital input pins are connected to I2CVDD.

Note 10: The given

θJA is for an LM4859SP mounted on a PCB with a 2in2 area of 10oz printed circuit board ground plane.

Note 11: “0dB gain” refers to the volume control gain setting of MIN,LIN, and RIN set at 0dB.

Note 12: The given

θJA is for an LM4859TL mounted on a PCB with a 2in2 area of 10oz printed circuit board ground plane.

External Components Description

Components

Functional Description

This is the input coupling capacitor. It blocks the DC voltage and couples the input signal to the

amplifier’s input terminals. C

IN also creates a high pass filter with the internal resistor Ri (Input

Impedance) at f

C = 1/(2

πR

iCIN).

This is the supply bypass capacitor. It filters the supply voltage applied to the V

DD pin and helps

reduce the noise at the V

DD pin.

This is the BYPASS pin capacitor. It filters the V

DD / 2 voltage and helps maintain the LM4859’s

PSRR.

OUT

This is the output coupling capacitor. It blocks the DC voltage and couples the output signal to the

speaker load R

L.COUT also creates a high pass filter with RL at fO = 1/(2

πR

LCOUT).

This resistor sets the gain of the National 3D effect. Please refer to the National 3D Enhancement

section for information on selecting the value of R

3D.

This capacitor sets the frequency at which the National 3D effect starts to occur. Please refer to the

National 3D Enhancement section for information on selecting the value of C

3D.

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