Electrical Characteristics V

The following specifications apply for V

Ω load unless otherwise specified. Limits apply for T

25˚C. (Continued)

Symbol

Parameter

Conditions

LM4928

Units

(Limits)

Typical

Limit

(Note 6)

(Note 7)

P

o

Output Power

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

R

Ω

R

Ω

0.55

0.40

W

THD = 10% (max);f=1kHz

R

Ω

R

Ω

0.68

0.50

W

THD+N

Total Harmonic Distortion + Noise

P

0.05

%

PSRR

Power Supply Rejection Ratio

V

f = 217Hz (Note 8)

90

dB

f = 1kHz (Note 8)

90

CMRR

Common-Mode Rejection Ratio

f = 217Hz, V

70

50

dB (min)

V

OS

Output Offset

V

4

18

mV (max)

V

SDIH

Shutdown Voltage Input High

1.4

V

V

SDIL

Shutdown Voltage Input Low

0.4

V

SNR

Signal-to-Noise Ratio

P

105

dB

T

WU

Wake-up time from Shutdown

Cbypass = 1µF

9

ms

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.

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

Note 8: Inputs are AC terminated to GND.

Note 9: When driving 4

Ω loads from a 5V power supply, the LM4928SD must be mounted to a circuit board with the exposed-DAP area soldered down to at least

Equation 4 shown in the Application section. It may also be obtained from the Power Dissipation graphs.

External Components Description

(Figure 1)

Components

Functional Description

1.

C

S

Supply bypass capacitor which provides power supply filtering. Refer to the Power Supply Bypassing

section for information concerning proper placement and selection of the supply bypass capacitor.

2.

C

B

Bypass pin capacitor which provides half-supply filtering. Refer to the Power Supply Bypassing section for

information concerning proper placement and selection of C

3.

R

i

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

4.

R

f

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

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