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LM49350 -
High Performance Audio Codec Sub-System with a Ground-Referenced Stereo Headphone Amplifier & Ultra Low EMI Class D Loudspeaker Amplifier with Dual I2S/PCM Digital Audio Interfaces
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Features
| • | High performance 96dB SNR stereo DAC |
| • | High performance 94dB SNR stereo ADC |
| • | Up to 192kHz stereo audio playback |
| • | Up to 48kHz stereo recording |
| • | Dual bidirectional I
2S or PCM compatible audio interfaces
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| • | Read/write I
2C compatible control interface
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| • | Flexible digital mixer with sample rate conversion |
| • | Dual sigma-delta PLLs for operation from any clock at any sample rate |
| • | Digital 3D stereo enhancement |
| • | Dual 5 band parametric equalizers |
| • | Cascadable DSP effects that allow 10 band parametric equalization |
| • | ALC/Compressor/Limiter on both DAC and ADC paths |
| • | Ultra low EMI, Class D loudspeaker amplifier with spread spectrum control |
| • | Ground referenced output cap-less headphone amplifier operation |
| • | Earpiece speaker amplifier with reduced power consumption mode for mono differential line out applications |
| • | Stereo auxiliary inputs or mono differential input |
| • | Differential stereo microphone inputs with single-ended option |
| • | Automatic level control for digital audio inputs, stereo microphone inputs, and stereo auxiliary inputs |
| • | Flexible audio routing from input to output |
| • | 16 Step volume control for microphones with 2dB steps |
| • | 32 Step volume control for auxiliary inputs in 1.5dB steps |
| • | Micro-power shutdown mode |
| • | Available in the 3.5 x 3.5 mm 36 bump micro SMD package |
Key Specification
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PHP at A_VDD = 3.3V, Stereo 32Ω, 1% THD
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69mW/ch (typ)
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PLS at LS_VDD = 5V, 8Ω, 1% THD
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1.2W (typ)
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PLS at LS_VDD = 4.2V, 8Ω, 1% THD
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825mW (typ)
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PLS at LS_VDD = 3.3V, 8Ω, 1% THD
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495mW (typ)
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PEP at A_VDD = 3.3V, 32Ω BTL, 1% THD
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58mW (typ)
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Supply Voltage Range
D_VDD = 1.7V to 2.0V
LS_VDD and 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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96dB (typ)
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SNR (Stereo ADC at 48kHz)
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94dB (typ)
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Shutdown Current
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2.3µA (typ)
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PSRR at 217 Hz, A_VDD = 3.3V, (HP from AUX)
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97dB (typ)
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General Description
The LM49350 is a high performance audio subsystem that supports both analog and digital audio functions. More...
Applications
| • | Smart Phones |
| • | Mobile Phones and VOIP Phones |
| • | Portable GPS Navigator and Portable Gaming Devices |
| • | Portable DVD/CD/AAC/MP3/MP4 Players |
| • | Digital Cameras/Camcorders |
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Typical Application
click for larger image
| Parameters | Values |
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| Power@ 4Ohms, 1% THD |
0.8 Watt |
| Power@ 8Ohms, 1% THD |
0.495 Watt |
| THD |
0.025 % |
| PSRR |
97 dB |
| SNR |
106 dB |
| Channels |
4 Channels |
| THD Conditions |
HP Out, Pout=7.5mW, PL=32ohms, Stereo analog in |
| PSRR Conditions |
HP Out, Vripple=200mVpp, f=217Hz, Stereo analog in terminated, Vref=1uF, mono diff. in |
| SNR Conditions |
Ref = Vout (1% THD+N), Gain = 0dB, A-weighted, Stereo Inputs Terminated |
| User Supply |
3.3 Volt |
| Audio Mux |
Yes |
| Capless Headphone |
Yes |
| ClassD Driver |
Yes |
| Interface |
I2S and PCM |
| Stereo Inputs |
2 |
| National 3D |
Yes |
| Digital Volume Control Max |
36 dB |
| Digital Volume Control Min |
-46.5 dB |
| Supply Range |
+2.7 - +5.5 V |
| Mono Inputs |
2 |
| Temperature Min |
-40 deg C |
| Temperature Max |
85 deg C |
| Loudspeaker Type |
Class D |
| Headphone Type |
True Ground |
| Automotive |
No |
| Loudspeaker Outputs |
1 |
| PowerWise |
No |
| A/D Channels |
2 Channels |
| D/A Channels |
2 |
Typical Performance
*click for larger image
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Also Recommended
| LM49352▲ | Lower Power Cusumption Headphone, Higher Output Power |
Additional Resources
Application Notes
Block Diagram
*click for larger image
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Datasheet
RoHS Compliance Information
| Size in Kbytes | Date |
 |
| LM49350 High Performance Audio Codec Sub-System with a Ground-Referenced Stereo Headphone Amplifier & an Ultra Low EMI Class D Loudspeaker Amplifier with Dual I 2 S/PCM Digital Audio Interfaces |
3475
Kbytes |
1-Jun-09 |
Download |
Package Availability, Models, Samples & Pricing
| Part Number | Package | Factory Lead Time | Models | Samples &
Electronic
Orders | Budgetary Pricing | Std
Pack
Size | Package
Marking
Format |
| Type | Pins | Spec. | MSL
Rating | Peak
Reflow | RoHS
Report | CAD
Symbols | Weeks | Qty | Qty | $US each |
| LM49350RLEVAL | LM49350 Evaluation Board | Full production | N/A
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| 1+ | $1000.00 | 1 | - |
| N/A | N/A |
| LM49350RL | MICRO SMDXT | 36 | NOPB | 1 | 260 | RoHS |
N/A |
Full production | N/A
| 
| 1K+ | $6.95 | reel
of
250 | XYTT
I GJ8 |
| 12 weeks | N/A |
| LM49350RLX | MICRO SMDXT | 36 | NOPB | 1 | 260 | RoHS |
N/A |
Full production | N/A
|
| 1K+ | $6.95 | reel
of
1000 | XYTT
I GJ8 |
| 6 weeks | N/A |
General Description
The LM49350 is a high performance audio subsystem that supports both analog and digital audio functions. The LM49350 includes
a high quality stereo DAC, a high quality stereo ADC, a stereo headphone amplifier that supports ground referenced output
cap-less operation, a dual mode earpiece speaker amplifier, and a low EMI Class D loudspeaker amplifier. It is designed for
demanding applications in mobile phones and other portable devices.
The LM49350 features dual bi-directional I
2S or PCM audio interfaces for full range audio and an I
2C compatible interface for control. The stereo DAC path features an SNR of 96dB with 24-bit 48 kHz input. The headphone amplifier
delivers 69mWRMS (typ) to a 32Ω single-ended stereo load with less than 1% distortion (THD+N) when A_VDD = 3.3V. The earpiece speaker amplifier delivers 58mWRMS (typ) to a 32Ω bridged-tied load with less than 1% distortion (THD+N) when A_VDD = 3.3V. The loudspeaker amplifier delivers up to 495mW 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 LM49350 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.
More Application Notes
| Title | Size in Kbytes |
Date |
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| 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
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251 Kbytes |
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| 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
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287 Kbytes |
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[Information as of 7-Nov-2009]
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