Datasheet

LM4906, LM4906LDBD, LM4906MMBD
www.ti.com SNAS191E –APRIL 2003–REVISED MAY 2013
Electrical Characteristics V
DD
= 3V
(1)(2)
The following specifications apply for the circuit shown in Figure 1, unless otherwise specified. Limits apply for T
A
= 25°C.
LM4906
Units
Symbol Parameter Conditions
(Limits)
Typical
(3)
Limit
(4)(5)
V
IN
= 0V, I
o
= 0A, No Load 2.6 6 mA (max)
I
DD
Quiescent Power Supply Current
V
IN
= 0V, I
o
= 0A, 8Ω Load 3 7 mA (max)
I
SD
Shutdown Current V
SD
= GND 0.1 2 µA (max)
V
OS
Output Offset Voltage 7 35 mV (max)
THD+N = 1% (max); f = 1 kHz
P
o
Output Power 390 mW
R
L
= 8Ω
T
WU
Wake-up time 4 ms
THD+N Total Harmonic Distortion+Noise P
o
= 0.15 Wrms; f = 1kHz 0.1 %
V
ripple
= 200mV sine p-p 71 (f = 217Hz)
PSRR Power Supply Rejection Ratio Input terminated with 10Ω 73 (f = 1kHz) dB
Gain at 6dB
V
SDIH
Shutdown Voltage Input High SD Pin High = Part On 1.1 V (min)
V
SDIL
Shutdown Voltage Input Low SD Pin Low = Part Off 0.9 V (max)
(1) 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 ensure specific performance limits. Electrical Characteristics state DC and AC electrical
specifications under particular test conditions which ensure specific performance limits. This assumes that the device is within the
Operating Ratings. Specifications are not ensured for parameters where no limit is given; however, the typical value is a good indication
of device performance.
(2) All voltages are measured with respect to the ground pin, unless otherwise specified.
(3) Typicals are measured at 25°C and represent the parametric norm.
(4) Limits are specified to AOQL (Average Outgoing Quality Level).
(5) Datasheet min/max specification limits are specified by design, test, or statistical analysis.
External Components Description
Components Functional Description
1. C
2
Input coupling capacitor which blocks the DC voltage at the amplifiers input terminals. Also creates a highpass filter with
R
i
at f
c
= 1 / (2πR
i
C
i
). Refer to the section, AUDIO POWER AMPLIFIER DESIGN, for an explanation of how to
determine the value of C
i
.
2. C
1
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.
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