peculiarity
-
Differential mono input and stereo single-ended input
-
Differential input for independent headphones (receiver).
-
Analog switch for a separate earpiece path
-
32-step digital volume control (-80 to 18 dB)
-
Three independent volume channels (left, right, mono)
-
Independent headphone volume control
-
Flexible output, speaker and headphone output
-
True headphone amplifiers eliminate large DC blocking capacitors, reducing board space and cost.
-
Hardware reset function
-
RF immunity topology
-
"Click" suppression circuit
-
Thermal shutdown protection
-
Micropower shutdown
-
I
2
C control interface
-
Space-saving microSMD package
illustrate
The LM49101 is a fully integrated mono power amplifier capable of delivering 540mW of continuous average power into a 1% THD+N with 8ΩBTL speakers using a 3.3V power supply load.
The LM49101 includes a separate stereo headphone amplifier that can deliver 44mW to 32Ω loads per channel using a 2.75V supply.
The LM49101 has 4 input channels.
A pair of single-ended inputs and a fully differential input channel with volume control and amplification stages.
In addition, the bypass differential input can be connected directly, without any amplification or volume control phase of the mono speaker output through the analog switch.
A 32-step input stage digital volume control and an 8-step digital volume control for the headphone output stage features the LM49101.
Digital volume control and output mode, programmed me through a two-wire
2
C-compatible interface that allows flexible routing and mixing audio channels.
The LM49101 is designed for cellular, PDA and other portable handheld applications.
High level of integration minimizes external components.
True headphone amplifiers eliminate bulky DC-blocking output capacitance, reducing board space required and reducing costs.
Main specifications
|
■
Supply voltage (V
DD
LS)
|
2.7V
≤
V
DD
LS
≤
5.5V
|
|
■
Supply voltage (V
DD
HP)
|
1.8V
≤
V
DD
HP
≤
2.9V
|
|
■
I
2
C supply voltage
|
1.7V
≤
I
2
resume
DD
≤
5.5V
|
|
■
Output power
|
|
|
V
DD
LS = 5V，V
DD
HP = 2.75V
1% THD+N
|
|
|
R
L = 8Ω speaker
|
1.3W (typical)
|
|
R
L = 32Ω headphones
|
45MW (typical)
|
|
■
Output power
|
|
|
V
DD
LS = 3.3V，V
DD
HP = 2.75V
1% THD+N
|
|
|
R
L = 8Ω speaker
|
540W (typical)
|
|
R
L = 32Ω headphones
|
40MW (typical)
|
|
■
PSRR：
|
|
|
VDD
= 3.3V, 217Hz ripple, Mono in
|
90 dB (typical)
|
|
■
Turn off the supply current
|
0.01μA (typical)
|
apply
-
Portable electronic devices
-
mobile phone
-
Pocket PC