Features • Ground referenced outputs • Differential Inputs • I 2C Volume and mode controls • Available in space-saving micro SMD package • Ultra low current shutdown mode • Advanced output transient suppression circuitry eliminates noises during turn-on and turn-off transitions • 2.0V to 4.0V operation (PVDD and SVDD) • 1.8 to 4.0V operation (I 2CVDD) • No output coupling capacitors, snubber networks, bootstrap capacitors, or gain-setting resistors required Description With its directly-coupled output technology, the LM48821 is a variable gain audio power amplifier capable of delivering 52mWRMS per channel into a 16Ω single-ended load with less than 1% THD+N from a 3V power supply. The I 2C volume control has a range of –76dB to 18dB. The LM48821's Tru-GND technology utilizes advanced charge pump technology to generate the LM48821’s negative supply voltage. This eliminates the need for output-coupling capacitors typically used with single-ended loads. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM48821 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile phone and other low voltage applications where minimal power consumption is a primary requirement. The LM48821 incorporates selectable low-power consumption shutdown and channel select modes. The LM48821 contains advanced output transient suppression circuitry that eliminates noises which would otherwise occur during turn-on and turn-off transitions. Key Specification ■  Improved PSRR at 217Hz 82dB (typ) ■   Stereo Output Power at VDD = 3V,  RL = 16Ω, THD+N = 1% 52mW (typ) ■   Mono Output Power at VDD = 3V,  RL = 16Ω, THD+N = 1% 93mW (typ) ■  Shutdown current 0.1μA (typ) Applications • Notebook PCs • Desktop PCs • Mobile Phones • PDAs • Portable Electronic Devices • MP3 Players

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Datasheets

Title		Size	Date	Other Language
	LM48821   Direct Coupled, Ultra Low Noise, 52mW Differential Input Stereo Headphone Amplifier with I2C Volume Control	621 Kbytes	6-Jun-07

Featured Application Notes

Title		Size	Date	Other Language
	AN-1589: Application Note 1589 LM48821 Evaluation Board User's Guide	1664 Kbytes	14-May-07

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Standard Pack Size
LM48821TL/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGIKEY Worldwide 735 RS COMPONENTS Worldwide 115	$0.95 each at 1K+ pcs	reel of 250
LM48821TLX/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGIKEY Worldwide 0	$0.95 each at 1K+ pcs	reel of 3000

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

CAD Symbols and Models Download LM48821 CAD Symbols

Models N/A