Features • I 2C/SPI Control Interface • I 2C/SPI programmable National 3D Audio • I 2C/SPI controlled 32 step digital volume control (-54dB to +18dB) • Three independent volume channels (Left, Right, Mono) • Eight distinct output modes • LLP and microSMD surface mount packaging • “Click and Pop” suppression circuitry • Thermal shutdown protection • Low shutdown current (0.02uA, typ) • RF immunity topology Description The LM4946 is an audio power amplifier capable of delivering 540mW of continuous average power into a mono 8Ω bridged-tied load (BTL) with 1% THD+N, 35mW per channel of continuous average power into stereo 32Ω single-ended (SE) loads with 1% THD+N, or an output capacitor-less (OCL) configuration with identical specifications as the SE configuration, from a 3.3V power supply. The LM4946 has three input channels: one pair for a two-channel stereo signal and the third for a differential single-channel mono input. The LM4946 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 I 2C or a three-wire SPI compatible interface that allows flexibility in routing and mixing audio channels. The LM4946 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). Key Specification ■  THD+N at 1kHz, 540mW  into 8Ω BTL (3.3V) 1.0% (typ) ■  THD+N at 1kHz, 35mW  into 32Ω SE (3.3V) 1.0% (typ) ■  Single Supply Operation (VDD) 2.7 to 5.5V ■   I 2C/SPI Single Supply Operation      LLP 2.2 to 5.5V    micro SMD 1.7 to 5.5V Applications • Mobile Phones • PDAs

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Typical Application *click for larger image	Connection Diagram *click for larger image *click for larger image 25 Bump micro SMD Package - Top View
Typical Performance click for larger image

Datasheet

Title		Size	Date	Other Language
	LM4946   Output Capacitor-Less Audio Subsystem with Programmable National 3D	814 Kbytes	1-Aug-07

Featured Application Notes

Title		Size	Date	Other Language
	AN-1496: Application Note 1496 Noise, TDMA Noise, and Suppression Techniques	85 Kbytes	28-Apr-08	中文

More Application Notes

Title		Size	Date	Other Language
	AN-1567: Application Note 1567 LM4949 Demonstration Board	3533 Kbytes	18-Jul-07	中文

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM4946SQ	CMOS7	0	18406	0	0	1089000	4	309006723
LM4946SQX	CMOS7	0	18406	0	0	1089000	4	309006723
LM4946TM	CMOS7	0	18406	0	0	1089000	4	309006723
LM4946TMX	CMOS7	0	18406	0	0	1089000	4	309006723

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.

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