PDF
| Part Number(s) (NSID) |
Top View | Type | Pins | MSL Rating | Peak Reflow | RoHS Status |
CAD Symbols | Models | Package Marking Format |
|---|---|---|---|---|---|---|---|---|---|
| LM4845ITL/NOPB |
MICRO SMD | 25 | 1 | 260 | Detail | Download | N/A |
XYTT I GE5 |
| • | I2C/SPI Control Interface |
| • | I2C/SPI programmable National 3D Audio |
| • | I2C/SPI controlled 32 step digital volume control (-54dB to +18dB) |
| • | Three independent volume channels (Left, Right, Mono) |
| • | Eight distinct output modes |
| • | microSMD surface mount packaging |
| • | "Click and Pop" suppression circuitry |
| • | Thermal shutdown protection |
| • | Low shutdown current (0.1uA, typ) |
Description
The LM4845 is an audio power amplifier capable of delivering 500mW of continuous average power into a mono 8
bridged-tied load (BTL) with 1% THD+N, 25mW per channel of continuous average power into stereo 32 single-ended (SE) loads with 1% THD+N, or an output capacitor-less (OCL) configuration with identical specification as the SE configuration, from a 3.3V power supply.
The LM4845 features a 32-step digital volume control and eight distinct output modes. The digital volume control, 3D enhancement, and output modes (mono/SE/OCL) are programmed through a two-wire I2C or a three-wire SPI compatible interface that allows flexibility in routing and mixing audio channels. The LM4845 has three input channels: one pair for a two-channel stereo signal and the third for a single-channel mono input.
The LM4845 is designed for cellular phone, PDA, and other portable handheld applications. It delivers high quality output power from a surface-mount package and requires only seven external components in the OCL mode (two additional components in SE mode).
| THD+N at 1kHz, 500mW into 8 BTL (3.3V) |
1.0% (typ) |
| THD+N at 1kHz, 30mW into 32 SE (3.3V) |
1.0% (typ) |
| Single Supply Operation (VDD) | 2.7 to 5.5V |
| I2C/SPI Single Supply Operation | 2.2 to 5.5V |
| • | Moblie Phones |
| • | PDAs |
Diagrams
Typical Application
|
Connection Diagram
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Typical Performance 
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