Features Ground Referenced Outputs – Eliminates Output Coupling Capacitors Common-Mode Sense Ultra-High PSRR I 2C Volume and Mode Control High Output Impedance in Shutdown Differential Inputs Advanced Click-and-Pop Suppression Low Supply Current Minimum external components Micro-power shutdown Available in space-saving 16-bump µSMD package Description The LM48822 is a single supply, ground-referenced stereo headphone amplifier designed for portable devices, such as cell phones, where board space is at a premium. The LM48822 features National’s ground-referenced architecture, which eliminates the large DC blocking capacitor required by traditional headphone amplifiers, saving board space and minimizing system cost. The LM48822 features common-mode sensing that corrects for any differences between the amplifier ground and the potential at the headphone return terminal, minimizing noise created by any ground mismatches. The LM48822 delivers 35mW/channel into a 16Ω load with <1% THD+N with a 3.6V supply. High power supply rejection ratio (PSRR), of 110dB at 217Hz, allows the device to operate in noisy environments without additional power supply conditioning. Flexible power supply requirements allow operation from 2.4V to 5.5V. The LM48822 has a differential inputs for improved noise rejection. High output impedance in Shutdown mode, combined with a charge pump-only mode allows the LM48822's outputs to be driven by an external source without degrading the source signal. Additionally, the LM48822 features a 64-step I 2C volume control and mute function. The low power Shutdown mode reduces supply current consumption to 0.06µA. Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown. The LM48822 is available in an ultra-small 16-bump micro SMD package (2mmx2mm). Key Specification ■ Output Power/channel at VDD = 3.6V   RL = 16Ω, THD+N ≤ 1% 35mW (typ) ■ Output Power/channel at VDD = 3.6V   RL = 32Ω, THD+N ≤ 1% 40mW (typ) ■  Quiescent Power Supply Current   at 3.6V 3.5mA (typ) ■  PSRR at 217Hz 110dB (typ) ■  Shutdown current 0.06μA (typ) Applications Mobile Phones PDAs Notebook PCs Portable Electronic Devices MP3 Players

Typical Application click for larger image	Connection Diagram click for larger image
Typical Performance click for larger image

Parameters Values Supply Current 3.5 mA User Supply 3.6 Volt Power@ 16Ohms, 1% THD .035 Watt Power@ 32Ohms, 1% THD .040 Watt THD 0.04 % PSRR 110 dB SNR 100 dB Channels 2 Channels Shutdown Type Undefined Supply Min 2.4 Volt Supply Max 5.5 Volt Volume Control I2C Exposed DAP No Output Configuration True Ground Special Features I2C Volume; Common Mode Sense Temperature Min -40 deg C Temperature Max 85 deg C AEC Q-100 Automotive Grade Undefined Automotive No THD Conditions PO = 50mW, f = 1kHz, RL = 16���� PSRR Conditions VRIPPLE = 200mVP-P, Inputs AC GND SNR Conditions fRIPPLE = 217Hz Supply Range +2.4 - +5.5 V Capless Headphone Yes

Datasheets

Title		Size	Date	Other Language
	LM48822 Ground-Referenced, Ultra-High PSRR, Ultra Low Noise, 35mW/Channel Stereo Headphone AMplifier with Common Mode Sense, and I2C Volume Control	590 Kbytes	9-Mar-11

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM48822TL/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 473 MOUSER Worldwide 500	$1.20 each at 1K+ pcs	reel of 250
LM48822TLX/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.20 each at 1K+ pcs	reel of 3000

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

Moisture Sensitivity Level Data for LM48822.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM48822 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM48822TLEVAL	LM48822TLEVAL Evaluation Board	Full production	Distributor Region Qty DIGI-KEY Worldwide 0 MOUSER Worldwide 1	$175.00 each	1
Description: The LM48822 is a single supply, ground-referenced stereo headphone amplifier designed for portable devices, such as cell phones, where board space is at a premium. The LM48822 features National`s ground-referenced architecture, which eliminates the large DC blocking capacitor required by traditional headphone amplifiers, saving board space and minimizing system cost. The LM48822 features common-mode sensing that corrects for any differences between the amplifier ground and the potential at the headphone return terminal, minimizing noise created by any ground mismatches. This LM48822TLEVAL is an evaluation kit designed to ease the evaluation and effort during the development of a circuit using the LM48822TL. Features: Ground Referenced Outputs - Eliminates Output Coupling Capacitors Common-Mode Sense Ultra-High PSRR I2C Volume and Mode Control High Output Impedance in Shutdown Differential Inputs Advanced Click-and-Pop Suppression Low Supply Current Minimum external components Micro-power shutdown Available in space-saving 16-bump ?D package Applications: Smartphones Mobile Phones and Multimedia Terminals PDAs, Portable Gaming Portable DVD/CD/AAC/MP3 Players Digital Cameras/Camcorders Contents: A fully assembled Audio Power Amplifier evaluation board One Digital Control Board (e.g. I2C/SPI, USB board, etc.) One Digital Control Cable Resources: Eval Board Digital Control Software

National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

Lead Free product status is available through the search tool located here

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM48822TL/NOPB	4.813 4.813	MICRO SMD	16	1	260	Detail	Download	N/A	XYTT I GK1
LM48822TLX/NOPB	4.813 4.813	MICRO SMD	16	1	260	Detail	Download	N/A	XYTT I GK1

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

Moisture Sensitivity Level Data for LM48822.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM48822 is located at RoHS Status.

CAD Symbols and Models Download LM48822 CAD Symbols

Models N/A