Pinout
Specifications| Power@ 8Ohms, 1% THD | 1.2 Watt |
| THD | 0.04 % |
| PSRR | 70 dB |
| SNR | 90 dB |
| THD Conditions | 8ohm; Vdd=3.3; Po=400mW |
| PSRR Conditions | Vrip=200mVp-p; f=217Hz |
| User Supply | 5 Volt |
| Audio Mux | Yes |
| Capless Headphone | Yes |
| ClassD Driver | Yes |
| Interface | I2C I2S SPI PCM |
| Stereo Inputs | I2S |
| National 3D | Yes |
| Digital Volume Control Max | 12 dB |
| Digital Volume Control Min | -46.5 dB |
| Supply Range | +2.0 - +5.5 V |
| Mono Inputs | PCM |
| Temperature Min | -40 deg C |
| Temperature Max | 85 deg C |
| Loudspeaker Type | Class D |
| Headphone Type | Virtual Ground |
| Loudspeaker Outputs | 3 |
| PowerWise | Yes |
| A/D Channels | 1 Channels |
| D/A Channels | 2 |
| View Using Catalog |
DescriptionThe LM49370 is an integrated audio subsystem that supports both analog and digital audio functions. The LM49370 includes a high quality stereo DAC, a mono ADC, a stereo headphone amplifier, which supports output cap-less (OCL) or AC-coupled (SE) modes of operation, a mono earpiece amplifier, and an ultra-low EMI spread spectrum Class D loudspeaker amplifier. It is designed for demanding applications in mobile phones and other portable devices.
The LM49370 features a bi-directional I 2S interface and a bi-directional PCM interface for full range audio on either interface. The LM49370 utilizes an I 2C or SPI compatible interface for control. The stereo DAC path features an SNR of 85 dB with an 18-bit 48 kHz input. In SE mode the headphone amplifier delivers at least 33 mWRMS to a 32Ω single-ended stereo load with less than 1% distortion (THD+N) when A_VDD = 3.3V. The mono earpiece amplifier delivers at least 115mWRMS to a 32Ω bridged-tied load with less than 1% distortion (THD+N) when A_VDD = 3.3V. The mono speaker amplifier delivers up to 490mW into an 8Ω load with less than 1% distortion when LS_VDD = 3.3V and up to 1.2W when LS_VDD = 5.0V.
The LM49370 employs advanced techniques to reduce power consumption, to reduce controller overhead, to speed development time, and to eliminate click and pop. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. It is therefore ideally suited for mobile phone and other low voltage applications where minimal power consumption, PCB area and cost are primary requirements.
Reliability Metrics
| Part Number |
Process |
EFR Reject |
EFR Sample Size |
PPM |
LTA Rejects |
LTA Device Hours |
FITS |
MTTF (Hours) |
| LM49370RL |
CMOS7 |
0 |
16561 |
0 |
0 |
954000 |
4 |
270700104 |
| LM49370RLX |
CMOS7 |
0 |
16561 |
0 |
0 |
954000 |
4 |
270700104 |
Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.For more information on Reliability Metrics, please click here.
Design Tools
| Title |
Size in Kbytes |
Date |
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| Audio Amplifier Digital Control Interface Evaluation Board Software |
16 Kbytes |
27-Mar-2008 |
View |
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If you have trouble printing or viewing PDF file(s), see Printing Problems.
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Application Notes
| Title |
Size in Kbytes |
Date |
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| AN-1609: Application Note 1609 LM49370 Demonstration Board Guide |
4417 Kbytes |
9-May-07 |
Download |
AN-1609 (Chinese): Application Note 1609 LM49370 Demonstration Board Guide
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1134 Kbytes |
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640){this.height=this.height*640/this.width;this.width=640;}' border="0" alt=" Connection Diagram"> |
| AN-1591: Application Note 1591 The LM49370 PCM/I 2 S Bridge |
737 Kbytes |
17-Jul-07 |
Download |
AN-1591 (Chinese): Application Note 1591 The LM49370 PCM/I 2 S Bridge
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546 Kbytes |
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640){this.height=this.height*640/this.width;this.width=640;}' border="0" alt=" Connection Diagram"> |
If you have trouble printing or viewing PDF file(s), see Printing Problems.
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LM49370 Data Sheet
