Packaging information
| Package | Pins DSBGA (YZR) | 16 |
| Operating temperature range (°C) -40 to 85 |
| Package qty | Carrier 250 | SMALL T&R |
Features for the LM49120
- RF Immunity
- Selectable OCL/SE Headphone Drivers
- 32 Step Volume Control
- Click and Pop Suppression
- Independent Speaker and Headphone Gain Settings
- Minimum External Components
- Thermal Over Load Protection
- Micro-power Shutdown
- Space Saving 16–bump DSBGA Package
- Thermal Shutdown Protection
- Micro-power Shutdown
- I2C Control Interface
Key Specifications
- Output Power at VDD =
5V:
- Speaker: RL = 8Ω BTL, THD+N ≤ 1%: 1.3W (typ)
- Headphone: RL = 32Ω, SE, THD+N ≤ 1%: 85mW (typ)
- Output Power at VDD =
3.6V:
- Speaker: RL = 8Ω, BTL, THD+N ≤ 1%: 632mW (typ)
- Output Power at VDD =
3.3V:
- Speaker: RL = 8Ω, BTL, THD+N ≤ 1%: 540mW (typ)
- Headphone: RL = 32Ω, OCL/SE, THD+N ≤ 1%: 35mW (typ)
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Description for the LM49120
The LM49120 is a compact audio subsystem designed for portable handheld applications such as cellular phones. The LM49120 combines a mono 1.3W speaker amplifier, stereo 85mW/ch output capacitorless headphone amplifier, 32 step volume control, and an input mixer/multiplexer into a single 16–bump DSBGA package.
The LM49120 has three input channels: two single-ended stereo inputs and a differential mono input. Each input features a 32-step digital volume control. The headphone output stage features an 8 step (-18dB – 0dB) attenuator, while the speaker output stage has two selectable (0dB/+6dB) gain settings. The digital volume control and mode control are programmed through a two-wire I2C compatible interface.