The following specifications apply for V

Ω, LC filter values as shown in Figure 1, unless other-

wise specified. Limits apply for T

Symbol

Parameter

Conditions

LM4682

Units

Typical

Max

Min

P

O

Power Out Per Channel

THD+N

≤ 1%, R

Ω,f

1kHz

80

60

mW

THD+N

Distortion + Noise

P

Ω,f

1kHz

0.02

%

V

NOISE

Output Noise Voltage, RMS

R

Ω,C

20Hz to 20kHz

A-weighted, input referred

9µV

PSRR

Power Supply Rejection Ratio

(Referred to Input)

200mV, 1kHz, V

Ω

88

dB

The following specifications apply for V

Symbol

Parameter

Conditions

LM4682

Units

(Limits )

Typical

(Note 8)

Limit

(Note 7)

C

RANGE

Gain Range

VOL_CTL voltage = VOLV

No Load

Power Amplifier

Headphone Amplifier

30

13

29

12

dB (min)

dB (min)

VOL_CTL voltage = 0.069 x VOLV

DD

No Load

Power Amplifier

Headphone Amplifier

–48

–65

–46

–63

dB (min)

dB (min)

A

M

Mute Gain

V

Power Amplifier

Headphone Amplifier

–80

–70

–60

–60

dB (max)

dB (max)

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: For operating at case temperatures above 25˚C, the device must be derated based on a 150˚C maximum junction temperature and a thermal resistance

of

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

Ω resistor. Device pin 16 has ESD HBM rating = 1500V.

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

Note 6: The operating junction temperature maximum is 150˚C.

Note 7: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).

Note 8: Typicals are measured at 25˚C and represent the parametric norm.

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