Pinout
Specifications| Power@ 4Ohms, 10% THD | 1.210 Watt |
| Power@ 4Ohms, 1% THD | 0.985 Watt |
| Power@ 8Ohms, 10% THD | 0.775 Watt |
| Power@ 8Ohms, 1% THD | 0.625 Watt |
| THD | 0.02 % |
| PSRR | 95 dB |
| SNR | Undefined dB |
| Channels | 3 Channels |
| THD Conditions | LS mode 2, RL=8ohms, Pout=300mW |
| PSRR Conditions | HP mode 2, f=217Hz, Vripple=200mVpp |
| SNR Conditions | Undefined |
| User Supply | 3.6 Volt |
| Audio Mux | Yes |
| Capless Headphone | Yes |
| ClassD Driver | Yes |
| Interface | I2C |
| Stereo Inputs | 2 |
| National 3D | Yes |
| Digital Volume Control Max | 21 dB |
| Digital Volume Control Min | -64 dB |
| Output Modes | 100 |
| Supply Range | +2.7 - +5.5 V |
| Mono Inputs | Differential |
| Temperature Min | -40 deg C |
| Temperature Max | 85 deg C |
| Loudspeaker Type | Class D |
| Headphone Type | True Ground |
| Loudspeaker Outputs | 3 |
| PowerWise | Yes |
| View Using Catalog |
DescriptionThe LM49250 is a fully integrated audio subsystem designed for stereo cell phone applications. The LM49250 combines a 2.4W/Ch stereo class D speaker amplifiers with a 45mW/Ch stereo ground referenced headphone amplifier, a class AB earpiece amplifier, National 3D enhancement, volume control, and an input mixer into a single device. The filterless class D amplifiers deliver 1.2W/Ch into an 8Ω load with <1% THD+N from a 5V supply.
The LM49250 features a new circuit technology that utilizes a charge pump to generate a negative supply voltage. This allows the headphone outputs to be biased about ground, thereby eliminating the output-coupling capacitors.
For improved noise immunity, the LM49250 features fully differential left, right and mono inputs. The three inputs can be mixed/multiplexed to any output combination of the loudspeaker, headphone or earpiece amplifiers. The left and right differential inputs can be used as separate single-ended inputs, mixing multiple stereo audio sources. The mixer, volume control, and device mode select are controlled through an I 2C compatible interface.
Output short circuit and thermal overload protection prevent the device from being damaged during fault conditions. Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown.
LM49250 Data Sheet
