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June 2007
LM49100 Mono Class AB Audio Subsystem with a True-Ground Headphone Amplifier
LM49100 Mono Class AB Audio Subsystem with a True-Ground Headphone Amplifier
General Description
The LM49100 is a fully integrated audio subsystem capable of delivering 1.275W of continuous average power into a mono 8Ω bridged-tied load (BTL) with 1% THD+N and with a 5V power supply. The LM49100 also has a stereo true-ground headphone amplifier capable of 50mW per channel of continuous average power into a 32Ω single-ended (SE) loads with 1% THD+N. The LM49100 has three input channels. One pair of SE inputs can be used with a stereo signal. The other input channel is fully differential and may be used with a mono input signal. The LM49100 features a 32-step digital volume control and ten distinct output modes. The mixer, volume control, and device mode select are controlled through an I2C compatible interface. Thermal overload protection prevent the device from being damaged during fault conditions. Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown.
Key Specifications
■ Power Output at VDD = 5V: Speaker: RL = 8Ω, THD+N ≤ 1% Headphone (VDDHP = 2.8V): RL = 32Ω, THD+N ≤ 1% ■ Shutdown current
1.275W 50mW 0.01µA
Features
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Mono and stereo inputs Thermal Overload Protection True-ground Headphone Drivers I2C Control Interface Input mute attenuation 2nd Stage headphone attenuator 32-step digital volume control 10 Operating Modes Minimum external components Click and Pop suppression Micro-power shutdown Available in space-saving 3mm x 3mm 25 bump GR package ■ RF Suppression
Applications
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Mobile Phones PDAs Laptops Portable Electronics
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2007 National Semiconductor Corporation
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LM49100
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Typical Application
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FIGURE 1. Typical Audio Amplifier Application Circuit
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LM49100
Connection Diagrams
GR Package 3mm × 3mm × 1mm
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Top View Order Number LM49100GR See NS Package Number GRA25A GR Package Marking
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Top View XY — 2 Digit datecode TT — Lot traceability G — Boomer Family C9 — LM49100GR
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LM49100
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Bump Descriptions
Bump A1 A2 A3 A4 A5 B1 B2 B3 B4 B5 C1 C2 C3 C4 C5 D1 D2 D3 D4 D5 E1 E2 E3 E4 E5 Name VDDCP GNDCP MIN+ BYPASS RIN C1N C1P MINLIN LS− VSSCP VSSHP GND ADDR VDDLS HPL VDDHP VDD I2C SDA LS+ HPR VDDLS AGND GND SCL Description Positive Charge Pump Power Supply Charge Pump Ground Positive Mono Input Half-Supply Bypass Right Input Negative Terminal – Charge Pump Flying Capacitor Positive Terminal – Charge Pump Flying Capacitor Negative Mono Input Left Input Negative Loudspeaker Output Negative Charge Pump Power Supply Negative Headphone Power Supply Ground I2C Address Identification Loudspeaker Power Supply Left Headphone Output Positive Headphone Power Supply I2C Power Supply I2C Data Loudspeaker Output Positive Right Headphone Output Loudspeaker Power Supply Headphone Signal Ground (See Application Information section). Ground I2C Clock
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LM49100
Absolute Maximum Ratings (Notes 1, 2)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (Loudspeaker) Supply Voltage (Headphone) Storage Temperature Input Voltage Power Dissipation (Note 3) ESD Susceptibility (Note 4) ESD Susceptibility (Note 5) Junction Temperature 6V 3V −65°C to +150°C −0.3V to VDD + 0.3V Internally Limited 2000V 200V 150°C
Thermal Resistance θJA (GR) 50.2°C/W
Operating Ratings
Temperature Range TMIN ≤ TA ≤ TMAX Supply Voltage VDDLS Supply Voltage VDDHP I2C Voltage (VDDI2C ) 2.7V ≤ VDDLS ≤ 5.5V −40°C ≤ TA ≤ +85°C
2.4 V ≤ VDDHP ≤ 2.9V
1.7V ≤ VDDI2C ≤ 5.5V VDDHP ≤ VDDLS VDDI2C ≤ VDDLS
The following specifications apply for all programmable gain set to 0 dB, CB = 4.7μF, RL (SP) = 8Ω, RL(HP) = 32Ω, f = 1 kHz unless otherwise specified. Limits apply for TA = 25°C. LM49100 Symbol Parameter Conditions Modes 1, 3, 5 VIN = 0V, No Load VDDLS = 3.0V Modes 2, 4, 6 VIN = 0V, No Load Modes 7, 10, 14 VIN = 0V, No Load Modes 1, 3, 5 VIN = 0V, No Load IDD Supply Current VDDLS = 3.6V Modes 2, 4, 6 VIN = 0V, No Load Modes 7, 10, 14 VIN = 0V, No Load Modes 1, 3, 5 VIN = 0V, No Load VDDLS = 5.0V Modes 2, 4, 6 VIN = 0V, No Load Modes 7, 10, 14 VIN = 0V, No Load ISD Shutdown Supply Current Mode 0 VIN = 0V, Mode 7, Mono VOS Output Offset Voltage VIN = 0V, Mode 7, Headphone Gain = –24dB VIN = 0V, Mode 7, Headphone Gain = –18dB VIN = 0V, Mode 7, Headphone Gain = –12dB VIN = 0V, Mode 7, Headphone Gain = 0dB LS f = 1kHz RL = 8Ω 1% 10% RL = 16Ω 1% 10% RL = 32Ω 1% 10% Typical (Note 6) 2.9 3.4 4.8 2.9 3.5 4.8 3.1 3.6 5.0 0.01 6.0 2.2 2.4 3.2 7 425 525 49 69 35 44 15 1 25 4.3 5.4 7.4 Limit (N.