LM48861TM/NOPB National Semiconductor, LM48861TM/NOPB Datasheet

IC AMP AUDIO .024W STER 12USMD

LM48861TM/NOPB

Manufacturer Part Number
LM48861TM/NOPB
Description
IC AMP AUDIO .024W STER 12USMD
Manufacturer
National Semiconductor
Series
Boomer®, PowerWise®r
Type
Class ABr
Datasheet

Specifications of LM48861TM/NOPB

Output Type
Headphones, 2-Channel (Stereo)
Max Output Power X Channels @ Load
24mW x 2 @ 16 Ohm
Voltage - Supply
1.2 V ~ 2.8 V
Features
Depop, Shutdown
Mounting Type
Surface Mount
Package / Case
12-MicroSMD
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
LM48861TMTR
© 2010 National Semiconductor Corporation
Ground-Referenced, Ultra Low Noise, Stereo Headphone
Amplifier
General Description
The LM48861 is a single supply, ground-referenced stereo
headphone amplifier. Part of National's PowerWise® product
family, the LM48861 consumes only 3mW of power, yet still
provides great audio performance. The ground-referenced
architecture eliminates the larger DC blocking capacitors re-
quired by traditional headphone amplifier's saving board
space and reducing cost.
The LM48861 features common-mode sensing that corrects
for any differences between the amplifier ground and the po-
tential at the headphone return terminal, minimizing noise
created by any ground mismatches.
The LM48861 delivers 22mW/channel into a 32Ω load with
<1% THD+N with a 1.8V supply. Power supply requirements
allow operation from 1.2V to 2.8V. High power supply rejec-
tion ratio (PSRR), 83dB at 217Hz, allows the device to oper-
ate in noisy environments without additional power supply
conditioning. A low power shutdown mode reduces supply
current consumption to 0.01µA.
Superior click and pop suppression eliminates audible tran-
sients on power-up/down and during shutdown. The
LM48861 is available in an ultra-small 12-bump, 0.4mm pitch,
micro SMD package (1.215mm x 1.615mm).
Boomer
®
is a registered trademark of National Semiconductor Corporation.
300541
LM48861
Key Specifications
Features
Applications
■ 
■ 
■ 
■ 
■ 
V
V
at 1.5V
Ground referenced outputs – eliminates output coupling
capacitors
Common-mode sensing
Advanced click-and-pop suppression
Low supply current
Minimum external components
Micro-power shutdown
ESD protection of 8kV HBM contact
Available in space-saving 12-bump microSMD package
Mobile Phones
Portable electronic devices
MP3 Players
Output Power/channel at
Output Power/channel at
Quiescent Power Supply Current
PSRR at 217Hz
Shutdown Current
DD
DD
R
R
R
R
L
L
L
L
= 1.5V, THD+N = 1%
= 1.8V, THD+N = 1%
= 16Ω
= 32Ω
= 16Ω
= 32Ω
March 16, 2010
www.national.com
0.01μA (typ)
12mW (typ)
13mW (typ)
24mW (typ)
22mW (typ)
83dB (typ)
2mA (typ)

Related parts for LM48861TM/NOPB

LM48861TM/NOPB Summary of contents

Page 1

... Superior click and pop suppression eliminates audible tran- sients on power-up/down and during shutdown. The LM48861 is available in an ultra-small 12-bump, 0.4mm pitch, micro SMD package (1.215mm x 1.615mm). Boomer ® registered trademark of National Semiconductor Corporation. © 2010 National Semiconductor Corporation LM48861 Key Specifications ■  Output Power/channel ...

Page 2

Typical Application www.national.com FIGURE 1. Typical Audio Amplifier Application Circuit 2 300541a9 ...

Page 3

Connection Diagrams TM Package 1.215mm x 1.615mm x 0.6mm Top View Order Number LM48861TM See NS Package Number TMD12AAA Order Number Package 12 Bump microSMD LM48861TM 0.4mm Pitch Bump Name A1 CPP Charge Pump Flying Capacitor Positive Terminal A2 PGND ...

Page 4

... Absolute Maximum Ratings 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (Note1) Storage Temperature Input Voltage Power Dissipation (Note 3) ESD Ratings (HBM) (Note 4) ESD Ratings (OUTL, OUTR) (Note 4) Electrical Characteristics V ...

Page 5

Symbol Parameter N Output Noise OUT C-P Click-Pop Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur, including inoperability and degradation of device reliability and/or performance. Functional operation of the device and/or non-degradation at ...

Page 6

Typical Performance Characteristics THD+N vs Frequency = 16Ω 1.5V THD+N vs Frequency = 16Ω 1.8V THD+N vs Output Power V = 1.5V & 1.8V www.national.com ...

Page 7

Power Dissipation vs Output Power = 16Ω 1kHz R L 300541h2 PSRR vs Frequency = 32Ω 1.5V 200mV , R DD RIPPLE P-P L 300541c8 Output Power vs Supply Voltage = 32Ω ...

Page 8

Shutdown Current vs Supply Voltage No Load www.national.com Crosstalk vs Frequency V = 1.5V 300541c9 8 = 32Ω = 5mW, R OUT L 300541c7 ...

Page 9

Application Information GENERAL AMPLIFIER FUNCTION The LM48861 headphone amplifier features National’s ground referenced architecture that eliminates the large DC- blocking capacitors required at the outputs of traditional head- phone amplifiers. A low-noise inverting charge pump creates a negative supply (CPV ...

Page 10

The -3dB point of the high-pass filter is found using Equation (2) below. π Where the value selected based on the gain-setting IN resistor selection. In relation to ...

Page 11

Demo Board Schematic and Layout FIGURE 3: Top Silkscreen Layer FIGURE 5: Bottom Solder Mask FIGURE 4: Top Solder Mask 30054110 30054106 FIGURE 6: Top Layer 11 30054199 30054109 www.national.com ...

Page 12

FIGURE 7: Layer 2 FIGURE 9: Bottom Layer www.national.com 30054107 FIGURE 8: Layer 3 FIGURE 10: Bottom Silkscreen 30054104 12 30054108 30054105 ...

Page 13

Revision History Rev Date 1.0 06/11/08 1.01 02/08/10 Description Initial release. Input text edits. 13 www.national.com ...

Page 14

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted TM Package Order Number LM48861TM NS Package Number TMD12AAA X1 = 1.215mm 1.615mm 0.6mm 14 ...

Page 15

Notes 15 www.national.com ...

Page 16

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...

Related keywords