LM4666 datasheet(4/15 Pages) NSC

4 / 15 page

Electrical Characteristics V

DD =3V

(Notes 1, 2)

The following specifications apply for V

DD = 3V and RL =15µH+8

Ω + 15µH unless otherwise specified. Limits apply for T

A =

25˚C.

Symbol

Parameter

Conditions

LM4666

Units

(Limits)

Typical

Limit

(Note 6)

(Notes 7, 8)

Quiescent Power Supply Current

IN = 0V, No Load

IN = 0V, RL =15µH+8

Ω + 15µH

6.5

7.0

mA (max)

Shutdown Current

SD = GND (Note 9)

0.02

2.0

µA (max)

SDIH

Shutdown Voltage Input High

1.0

1.4

V (min)

SDIL

Shutdown Voltage Input Low

0.8

0.4

V (max)

GSIH

Gain Select Input High

1.0

1.4

V (min)

GSIL

Gain Select Input Low

0.8

0.4

V (max)

Closed Loop Gain

Gain Select =VDD

5.25

6.75

dB (min)

dB (max)

Closed Loop Gain

Gain Select = GND

11.25

12.75

dB (min)

dB (max)

Output Offset Voltage

mV (max)

Wake-up Time

Output Power

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

22kHz BW

450

400

mW (min)

THD+N

Total Harmonic Distortion+Noise

O = 100mWRMS/Channel,

IN = 1kHz, 22kHz BW,

Both channels in phase

0.65

TALK

Channel Separation

O = 100mWRMS, f = 1kHz

Differential Input Resistance

Gain Select =VDD

Ω

Gain Select = GND

Ω

PSRR

Power Supply Rejection Ratio

ripple = 100mVRMS sine wave,

RIPPLE = 217Hz,

Inputs terminated to AC GND

Ripple = 100mVRMS sine wave,

RIPPLE = 217Hz,

OUT = 10mW,1kHz

CMRR

Common Mode Rejection Ratio

Ripple = 100mVRMS,

Ripple = 217Hz, Input referred

SNR

Signal to Noise Ratio

O = 400mWRMS, A-Weighted Filter

OUT

Output Noise

A-Weighted filter, V

in = 0V

125

µV

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 LM4666, TJMAX = 150˚C.

The typical

θJA is 63˚C/W and the typical θJC is 12˚C/W for the SDA package.

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: Typical specifications are specified at 25˚C and represent the parametric norm.

Note 7: Tested 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. Exposure to direct sunlight will increase ISD by a maximum of 2µA. The Shutdown pin should

be driven as close as possible to GND for minimal shutdown current and to VDD for the best THD performance in PLAY mode. See the Application Information

section under SHUTDOWN FUNCTION for more information.

Note 10: The performance graphs were taken using the Audio Precision AUX–0025 Switching Amplifier Measurement Filter in series with the LC filter on the demo

board.

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