Overview
The LM49350RLX/NOPB is a high-performance audio codec subsystem designed by Texas Instruments. This component integrates a range of audio functions, including a high-quality stereo DAC, a high-quality stereo ADC, a ground-referenced stereo headphone amplifier, and an ultra-low EMI Class D loudspeaker amplifier. It is particularly suited for mobile phones, smart phones, and other portable audio devices where low power consumption and minimal PCB area are critical.
Key Specifications
| Parameter | Conditions | Typical | Limit |
|---|---|---|---|
| Supply Voltage Range | A_VDD and LS_VDD | 2.7V to 5.5V | |
| Digital Supply Voltage | D_VDD | 1.7V to 2.2V | |
| I/O Supply Voltage | I/O_VDD | 1.6V to 4.5V | |
| Stereo DAC SNR | At 48kHz | 96dB | |
| Stereo ADC SNR | At 48kHz | 94dB | |
| Headphone Amplifier Power | A_VDD = 3.3V, 32Ω, 1% THD | 69mW/ch | |
| Loudspeaker Amplifier Power | LS_VDD = 3.3V, 8Ω, 1% THD | 495mW | |
| Loudspeaker Amplifier Power | LS_VDD = 5V, 8Ω, 1% THD | 1.2W | |
| PSRR at 217 Hz | A_VDD = 3.3V | 97dB |
Key Features
- Dual bi-directional I2S or PCM digital audio interfaces
- I2C compatible control interface
- High performance 96dB SNR stereo DAC and 94dB SNR stereo ADC
- Ground-referenced stereo headphone amplifier and ultra-low EMI Class D loudspeaker amplifier
- Dual Sigma-Delta PLLs for operation from any clock at any sample rate
- Flexible digital mixer with sample rate conversion
- Digital 3D stereo enhancement and cascadable DSP effects
- Automatic level control (ALC) and compressor/limiter on both DAC and ADC paths
- Micro-power shutdown mode and reduced power consumption mode
- Support for stereo auxiliary inputs or mono differential input
- Differential stereo microphone inputs with single-ended option
Applications
- Smart phones and mobile phones
- VOIP phones
- Portable GPS navigators and gaming devices
- Portable DVD/CD/AAC/MP3/MP4 players
- Digital cameras and camcorders
Q & A
- What is the primary function of the LM49350RLX/NOPB?
The LM49350RLX/NOPB is a high-performance audio codec subsystem that integrates a stereo DAC, a stereo ADC, a ground-referenced stereo headphone amplifier, and an ultra-low EMI Class D loudspeaker amplifier.
- What are the supported digital audio interfaces?
The LM49350RLX/NOPB supports dual bi-directional I2S or PCM digital audio interfaces.
- What is the SNR of the stereo DAC and ADC?
The stereo DAC has an SNR of 96dB, and the stereo ADC has an SNR of 94dB, both at 48kHz.
- What is the power output of the headphone amplifier?
The headphone amplifier delivers 69mW per channel into a 32Ω load with less than 1% THD+N when A_VDD = 3.3V.
- What is the power output of the loudspeaker amplifier?
The loudspeaker amplifier delivers up to 495mW into an 8Ω load with less than 1% THD+N when LS_VDD = 3.3V, and up to 1.2W when LS_VDD = 5V.
- What are the supported supply voltage ranges?
The supply voltage ranges are 2.7V to 5.5V for A_VDD and LS_VDD, 1.7V to 2.2V for D_VDD, and 1.6V to 4.5V for I/O_VDD.
- Does the LM49350RLX/NOPB support I2C control?
Yes, it supports an I2C compatible control interface.
- What are some of the key applications for the LM49350RLX/NOPB?
Key applications include smart phones, mobile phones, VOIP phones, portable GPS navigators, gaming devices, and digital cameras.
- Does the LM49350RLX/NOPB have any power-saving features?
Yes, it includes a micro-power shutdown mode and reduced power consumption modes.
- What kind of audio enhancements does the LM49350RLX/NOPB support?
The LM49350RLX/NOPB supports digital 3D stereo enhancement and cascadable DSP effects, including 5-band parametric equalizers and ALC/compressor/limiter on both DAC and ADC paths.
