Features: ` 18-bit 44.1kHz or 48kHz stereo DAC
` 16-bit 8kHz , 12kHz , 16kHz, or 24kHz voice-band codec
` PLL for operation from common system clocks
` Either I2C or SPI compatible serial interface
` I2S digital audio data serial interface
` PCM voice audio data serial interface
` Differential analog microphone input
` 26mW/channel stereo headphone amplifier
` 570mW mono high efficiency BTL 8 amplifier
` 32-step volume control for audio output amplifiers with 1.5dB step size.
` Unity-gain stable headphone amplifiers
` No snubber networks or bootstrap capacitors are required by the headphone or hands-free amplifiers
` Adjustable digital side-tone attenuation
` 16-step volume control for microphone preamp with 2dB step size
` Configurable GPIO/Status Port
` Available in the 42 bump micro-SMD packageSpecifications
| Power@ 4Ohms, 10% THD |
Undefined Watt |
| Power@ 4Ohms, 1% THD |
Undefined Watt |
| Power@ 8Ohms, 10% THD |
Undefined Watt |
| Power@ 8Ohms, 1% THD |
1.1 Watt |
| THD |
0.4 % |
| PSRR |
50 dB |
| SNR |
86 dB |
| Channels |
3 Channels |
| THD Conditions |
fout=1kHz, Pout=100mW |
| PSRR Conditions |
Cb=1.0uF,vripple=200mVp-p,fripple=217Hz |
| SNR Conditions |
fmclk=12.288MHz, PLL disabled |
| User Supply |
3 Volt |
| Audio Mux |
Yes |
| Capless Headphone |
No |
| ClassD Driver |
Yes |
| Interface |
I2C,SPI |
| Stereo Inputs |
I2S |
| National 3D |
No |
| Digital Volume Control Max |
Undefined dB |
| Digital Volume Control Min |
-46.5 dB |
| Output Modes |
11 |
| Supply Range |
+2.7 - +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 |
1 |
| A/D Channels |
1 Channels |
| D/A Channels |
2 |
| View Using Catalog |
If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.
Analog Supply Voltage .....................................................6.0V
Digital Supply Voltage ......................................................6.0V
Storage Temperature................................ -65°C to +150°C
Power Dissipation (Note 3)......................... Internally Limited
ESD Susceptibility
Human Body Model (Note 4)........................................ 2500V
Machine Model (Note 5) .................................................200V
Junction Temperature .................................................150°C
Thermal Resistance
JA - TLA42YVA .......................................................105°C/W
DescriptionThe LM4931 is an integrated audio subsystem that supports voice and digital audio functions. The LM4931 includes a high quality stereo DAC, voice band codec, a stereo headphone amplifier and a high-power high efficiency mono speaker amplifier. It is primarily designed for demanding applications in mobile phones and other portable devices.
The LM4931 features an I2S serial interface for full range audio, a 16-bit PCM bi-directional serial interface for the voice band codec and an I2C/SPI compatible interface for control. The full range music path features an SNR of 86dB with an 18-bit 48kHz input. The headphone amplifier delivers at least 26mWRMS to a 32 single-ended stereo load with less than 1% distortion (THD+N) when AVDD = 3.3VDC. The mono speaker amplifier delivers up to 570mWRMS into an 8 load with less than 1% distortion when AVDD = 3.3VDC.
The LM4931 employs advanced techniques to reduce power consumption, to reduce controller overhead, 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) |
| LM4931ITL |
CMOS7 |
0 |
16561 |
0 |
0 |
954000 |
4 |
270700104 |
| LM4931ITLX |
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 |
|
|
|
| Audio Amplifier Digital Control Interface Evaluation Board Software |
16 Kbytes |
27-Mar-2008 |
View |
|
|
If you have trouble printing or viewing PDF file(s), see Printing Problems.
|
More Application Notes
| Title |
Size in Kbytes |
Date |
|
| AN-1492: Application Note 1492 LM4934 I2C/SPI Interface Software Manual v1.0 |
1527 Kbytes |
25-May-06 |
Download |
AN-1492 (Chinese): Application Note 1492 LM4934 I2C/SPI Interface Software Manual v1.0
|
701 Kbytes |
|
640){this.height=this.height*640/this.width;this.width=640;}' border="0" alt=" Connection Diagram"> |
| AN-1432: Application Note 1432 The LM4935 Headset/Push-Button Detection Guide |
464 Kbytes |
24-Apr-06 |
Download |
AN-1432 (Chinese): Application Note 1432 The LM4935 Headset/Push-Button Detection Guide
|
251 Kbytes |
|
640){this.height=this.height*640/this.width;this.width=640;}' border="0" alt=" Connection Diagram"> |
| AN-1451: Application Note 1451 LM4935 Automatic Gain Control (AGC) Guide |
550 Kbytes |
24-Apr-06 |
Download |
AN-1451 (Chinese): Application Note 1451 LM4935 Automatic Gain Control (AGC) Guide
|
287 Kbytes |
|
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.
|
LM4931 Data Sheet
