peculiarity
-
Ultra-high efficiency, spread-spectrum Class-D speaker amplifier operating at 93%
-
Low voltage, realistic headphone amplifier operation
-
High performance 103dB signal-to-noise stereo DAC
-
High performance 97 dB SNR stereo ADC
-
Up to 96kHz stereo audio playback
-
Up to 48kHz stereo recording
-
Double bidirectional I
2
S or PCM audio interface compatible
-
Read/Write I
2
C compatible control interface
-
Flexible digital mixer with sample rate conversion
-
The Σ-ΔPLL clock network supports system clocks up to 50MHz, including 13MHz, 19.2MHz, and 26MHz
-
Dual stereo 5-band parametric equalizer
-
Cascaded DSP effect equalizes stereo 10-band parameters
-
ALC/limiter/compressor DAC and ADC paths
-
Dedicated earpiece speaker amplifier
-
Stereo auxiliary input and mono differential input
-
Differential and single-ended option microphone inputs
-
Digital audio input, mono differential input, microphone input, stereo auxiliary input automatic level control
-
Flexible audio routing from input to output
-
Volume control for 16-step 2dB-step microphone
-
Volume control for 32 steps of 1.5 dB step auxiliary input
-
Volume control for Class D speaker amplifiers in 4 steps
-
8-step volume control headphone amplifier
-
Micropower shutdown mode
-
Available in 3.3mm × 3.3mm 36 solder ball micro SMD packages
illustrate
The LM49352 is a high-performance mixed-signal audio subsystem.
The LM49352 includes a high quality stereo DAC, a high quality stereo ADC, a stereo headphone amplifier that supports real-world operation, a low EMI Class D speaker amplifier, and a handset speaker amplifier.
It combines advanced audio processing, conversion, mixing, and amplification in the smallest possible volume while extending the battery life of feature-rich portable devices.
The LM49352 features dual bidirectional I
2
S or PCM audio interface and I
2
C-compatible interface control.
The stereo DAC path feature features a 103dB signal-to-noise ratio with a 24-bit 48 kHz input.
The headphone amplifier provides 65mW
RMS
(typical) less than 1% distortion (THD+N) when a 32Ω single-ended stereo load is performed
HP_V
DD = 2.8V 。
The speaker amplifier provides less than 1% distortion LS_V 970mW into an 8Ω load
DD
= 4.2V。
The LM49352 features advanced technology to extend battery life, reduce controller overhead to reduce development time, and eliminate clicks and ejection artifacts.
Boomer audio power amplifiers are designed for mobile devices and require minimal PCB area and external components.
Main specifications
|
Efficiency of Class D amplifiers
|
93% (typical)
|
|
P
EP
A_V
DD
= 3.3V，32Ω，1％THD
|
58MW (typical)
|
|
P
Hp
In HP_V
DD
= 2.8V, stereo 32Ω,
1% total harmonic distortion
|
65mW/ch (typical)
|
|
P
LS
LS_V
DD
= 5V，8Ω，1％THD
|
1.4W (typical)
|
|
P
LS
LS_V
DD
= 4.2V，8Ω，1％THD
|
970mW (typical)
|
|
P
LS
LS_V
DD
= 3.3V，8Ω，1％THD
|
590mW (typical)
|
|
SNR (stereo DAC at 48kHz)
|
103 dB (typical)
|
|
PSRR A_V
DD
= 3.3V，
At 217 Hz
(HP from AUX)
|
100 dB (typical)
|
apply
-
Smartphones
-
Mobile phones and VoIP phones
-
Portable GPS navigation and portable gaming devices
-
Portable DVD/CD/AAC/MP3/MP4 players
-
Digital cameras/camcorders