- High-performance 96dB SNR stereo DAC
- High performance 94dB SNR stereo ADC
- Up to 192kHz stereo audio playback
- Up to 48kHz stereo recording
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Double bidirectional I 2 S or PCM audio interface compatible
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Read/Write I 2 C compatible control interface
- Flexible digital mixer and sample rate conversion
- Dual sigma-delta phase-locked loops operate any clock at any sample rate
- Digital 3D stereo enhancement
- Dual band parametric equalizer5
- Cascaded DSP effect equalizes 10-band parameters
- ALC/compressor/limiter in both DAC and ADC paths
- Ultra-low EMI, spread spectrum control of Class D speaker amplifiers
- Ground-referenced output upper limit headphone amplifier operation
- The earpiece and mono differential lines that reduce power consumption consume the application mode of the speaker amplifier
- Mono stereo auxiliary input or differential input
- Differential stereo single-ended microphone input option
- Automatic level control for digital audio input, stereo microphone input and stereo auxiliary input
- Flexible audio routing from input to output
- 16 steps for 2dB step microphone volume control
- 32 steps for 1.5 dB steps to assist in the input volume control
- Micropower shutdown mode
- Available in a 3.5 x 3.5 mm 36 solder ball micro SMD package
illustrate
The LM49350 is a high-performance audio subsystem that supports both analog and digital audio functions. The LM49350 includes a high-quality stereo DAC, high-quality stereo ADC, stereo headphone amplifier, output upper limit supporting ground reference, low-operation, dual-mode headphone speaker amplifier, and low EMI Class D speaker amplifier. It is designed for demanding applications in mobile phones and other portable devices.
The LM49350 uses dual bidirectional I 2 Full-range audio and S or PCM audio interface 2 C-compatible interface control. The stereo DAC path features a 96 dB SNR with a 24-bit 48 kHz input. The headphone amplifier offers 69MWRMS（typical) to 32Ω single-ended less than 1% distortion (THD + N) stereo load A_VDD= 3.3V。 The earpiece speaker amplifier provides 58MWRMS（typical) to 32Ω bridge hook less than 1% distortion load (THD+N) when A_VDD= 3.3V。 The speaker amplifier delivers 495mW into an 8Ω load with less than 1% distortion LS_VDD= 3.3V and up to 1.2W LS_VDD = 5.0V。
The LM49350 uses advanced technology to reduce power consumption, reduce controller overhead, speed up development time, and eliminate noise. Boomer audio power amplifiers are designed to provide high quality output power with a small number of external components. Therefore, it is ideal for mobile phones and other low voltage applications with the lowest power consumption, PCB area and cost requirements.
Main specifications
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PHPIn A_VDD= 3.3V, stereo 32Ω, 1% THD
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69mW/ch (typical)
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PLSIn LS_VDD= 5V，8Ω，1％THD
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1.2W (typical)
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PLSIn LS_VDD= 4.2V，8Ω，1％THD
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825mW (typical)
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PLSIn LS_VDD= 3.3V，8Ω，1％THD
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495mW (typical)
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PEPIn A_VDD= 3.3V，32ΩBTL，1％THD
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58MW (typical)
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■ Supply voltage range D_VDD= 1.7V to 2.0V LS_VDDand A_VDD= 2.7V to 5.5V I / O_VDD= 1.6V to 4.5V
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SNR (stereo DAC at 48kHz)
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96 dB (typical)
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SNR (stereo ADC at 48kHz)
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94 dB (typical)
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Shutdown current
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2.3μA (typical)
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PSRR at 217 Hz, A_VDD= 3.3V, (from AUX HP)
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97 dB (typical)
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apply
- Smartphones
- Mobile phones and VoIP phones
- Portable GPS navigators and portable gaming devices
- Portable DVD/CD/AAC/MP3/MP4 players
- Digital cameras/camcorders
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