LM49450

활성

36mW 헤드폰 증폭기 및 3D 향상을 지원하는 2.5W, 스테레오, 디지털 입력 클래스 D 증폭기

제품 상세 정보

Audio input type Analog Input, Digital Input Architecture Class-D Speaker channels (max) Stereo Rating Catalog Power stage supply (max) (V) 5.5 Power stage supply (min) (V) 2.7 Load (min) (Ω) 4 Output power (W) 1.1 THD + N at 1 kHz (%) 0.06 Iq (typ) (mA) 5.3 Control interface I2C Closed/open loop Closed Analog supply (min) (V) 2.7 Analog supply voltage (max) (V) 5.5 Sampling rate (max) (kHz) 192 PSRR (dB) 77 Operating temperature range (°C) -40 to 85
Audio input type Analog Input, Digital Input Architecture Class-D Speaker channels (max) Stereo Rating Catalog Power stage supply (max) (V) 5.5 Power stage supply (min) (V) 2.7 Load (min) (Ω) 4 Output power (W) 1.1 THD + N at 1 kHz (%) 0.06 Iq (typ) (mA) 5.3 Control interface I2C Closed/open loop Closed Analog supply (min) (V) 2.7 Analog supply voltage (max) (V) 5.5 Sampling rate (max) (kHz) 192 PSRR (dB) 77 Operating temperature range (°C) -40 to 85
WQFN (RTV) 32 25 mm² 5 x 5
  • 24–Bit Stereo DAC
  • Stereo Filterless Class D Operation
  • Selectable Spread Spectrum Mode Reduces EMI
  • Ground Referenced Headphone Amplifiers with 100dB SNR
  • I2S Compatible Audio Interface
  • Audio Sample Rates up to 192kHz
  • TI’s 3D Enhancement
  • 32-Step Digital Volume Control
  • I2C-Compatible Control Interface
  • Headphone Sense Input
  • Stereo Analog Line Inputs
  • Output Short Circuit Protection
  • Thermal Overload Protection
  • Minimum External Components
  • Click and Pop Suppression
  • Micro-Power Shutdown
  • Available in Space-Saving 32-Pin WQFN Package

Key Specifications

  • SNR at Headphone Output: 102dBA (typ)
  • Speaker Amplifier Efficiency at 3.6V, 650mW/Channel into 8Ω: 87% (typ)
  • Speaker Amplifier Efficiency at 5V, 1.1W/Channel into 8Ω: 80% (typ)
  • Quiescent Power Supply Current Line Inputs:
    • Speaker Mode at LSVDD = 3.6V: 7.5mA (typ)
    • Headphone Mode at HPVDD = 2.5V: 5.3mA (typ)
  • Output Power/Channel Speaker at LSVDD = 5V:
    • RL = 4Ω, THD+N ≤ 10%: 2.5W (typ)
    • RL = 8Ω, THD+N ≤ 1%: 1.25W (typ)
  • Headphone at HPVDD = 2.5V:
    • RL = 16Ω, THD+N ≤ 1%: 34mW (typ)
    • RL = 32Ω, THD+N ≤ 1%: 36mW (typ)
  • PSRR at 1kHz
    • Speaker Mode: 67dB ( typ)
    • Headphone Mode: 77dB (typ)
  • Shutdown current: 0.02μA (typ)

is a trademark of Texas Instruments. All trademarks are the property of their respective owners.

  • 24–Bit Stereo DAC
  • Stereo Filterless Class D Operation
  • Selectable Spread Spectrum Mode Reduces EMI
  • Ground Referenced Headphone Amplifiers with 100dB SNR
  • I2S Compatible Audio Interface
  • Audio Sample Rates up to 192kHz
  • TI’s 3D Enhancement
  • 32-Step Digital Volume Control
  • I2C-Compatible Control Interface
  • Headphone Sense Input
  • Stereo Analog Line Inputs
  • Output Short Circuit Protection
  • Thermal Overload Protection
  • Minimum External Components
  • Click and Pop Suppression
  • Micro-Power Shutdown
  • Available in Space-Saving 32-Pin WQFN Package

Key Specifications

  • SNR at Headphone Output: 102dBA (typ)
  • Speaker Amplifier Efficiency at 3.6V, 650mW/Channel into 8Ω: 87% (typ)
  • Speaker Amplifier Efficiency at 5V, 1.1W/Channel into 8Ω: 80% (typ)
  • Quiescent Power Supply Current Line Inputs:
    • Speaker Mode at LSVDD = 3.6V: 7.5mA (typ)
    • Headphone Mode at HPVDD = 2.5V: 5.3mA (typ)
  • Output Power/Channel Speaker at LSVDD = 5V:
    • RL = 4Ω, THD+N ≤ 10%: 2.5W (typ)
    • RL = 8Ω, THD+N ≤ 1%: 1.25W (typ)
  • Headphone at HPVDD = 2.5V:
    • RL = 16Ω, THD+N ≤ 1%: 34mW (typ)
    • RL = 32Ω, THD+N ≤ 1%: 36mW (typ)
  • PSRR at 1kHz
    • Speaker Mode: 67dB ( typ)
    • Headphone Mode: 77dB (typ)
  • Shutdown current: 0.02μA (typ)

is a trademark of Texas Instruments. All trademarks are the property of their respective owners.

The LM49450 is a fully integrated audio subsystem designed for portable media player applications. The LM49450 combines a 24-bit I2S digital-to-analog converter (DAC), 2.5W/channel stereo Class D speaker drivers, 36mW stereo ground referenced headphone drivers, volume control, and TI’s unique 3D sound enhancement into a single device.

The filterless Class D amplifiers deliver 1.25W/channel into an 8Ω load with <1% THD+N with a 5V supply. The LM49450 offers two logic selectable modulation schemes, fixed frequency mode, and an EMI reducing spread spectrum mode. The 36mW/channel headphone drivers feature TI’s ground referenced architecture that creates a ground-referenced output from a single supply, eliminating the need for bulky and expensive DC-blocking capacitors, saving space and minimizing system cost. A headphone sense input (HPS) automatically detects the presence of a headphone, and configures the device accordingly.

The LM49450 stereo, 24-bit DAC supports a wide range of sample rates (including 192kHz, 96kHz, 48kHz, and 44.1kHz). The digital audio signal path features better than 100dB SNR, and low 0.05% THD+N when measured at the headphone outputs. The flexible 3-wire I2S interface supports left or right justified audio data.

The LM49450 features separate 32-step volume control for the headphones and speaker outputs. 3D enhancement, mode selection, shutdown control, and volume are controlled through an I2C compatible interface.

Output short circuit and 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. The LM49450 is available in a space saving 32-pin WQFN package.

The LM49450 is a fully integrated audio subsystem designed for portable media player applications. The LM49450 combines a 24-bit I2S digital-to-analog converter (DAC), 2.5W/channel stereo Class D speaker drivers, 36mW stereo ground referenced headphone drivers, volume control, and TI’s unique 3D sound enhancement into a single device.

The filterless Class D amplifiers deliver 1.25W/channel into an 8Ω load with <1% THD+N with a 5V supply. The LM49450 offers two logic selectable modulation schemes, fixed frequency mode, and an EMI reducing spread spectrum mode. The 36mW/channel headphone drivers feature TI’s ground referenced architecture that creates a ground-referenced output from a single supply, eliminating the need for bulky and expensive DC-blocking capacitors, saving space and minimizing system cost. A headphone sense input (HPS) automatically detects the presence of a headphone, and configures the device accordingly.

The LM49450 stereo, 24-bit DAC supports a wide range of sample rates (including 192kHz, 96kHz, 48kHz, and 44.1kHz). The digital audio signal path features better than 100dB SNR, and low 0.05% THD+N when measured at the headphone outputs. The flexible 3-wire I2S interface supports left or right justified audio data.

The LM49450 features separate 32-step volume control for the headphones and speaker outputs. 3D enhancement, mode selection, shutdown control, and volume are controlled through an I2C compatible interface.

Output short circuit and 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. The LM49450 is available in a space saving 32-pin WQFN package.

다운로드 스크립트와 함께 비디오 보기 동영상

기술 자료

star =TI에서 선정한 이 제품의 인기 문서
검색된 결과가 없습니다. 검색어를 지우고 다시 시도하십시오.
1개 모두 보기
유형 직함 날짜
* Data sheet I2S, 2.5W/Ch, Low EMI, Stereo, Class D w/Gnd Ref Headphone Amp, 3D Enhancement datasheet (Rev. D) 2013/05/01

설계 및 개발

추가 조건 또는 필수 리소스는 사용 가능한 경우 아래 제목을 클릭하여 세부 정보 페이지를 확인하세요.

지원 소프트웨어

SNAC025 LM49450 Software

지원되는 제품 및 하드웨어

지원되는 제품 및 하드웨어

제품
스피커 증폭기
LM49450 36mW 헤드폰 증폭기 및 3D 향상을 지원하는 2.5W, 스테레오, 디지털 입력 클래스 D 증폭기
시뮬레이션 툴

PSPICE-FOR-TI — TI 설계 및 시뮬레이션 툴용 PSpice®

TI용 PSpice®는 아날로그 회로의 기능을 평가하는 데 사용되는 설계 및 시뮬레이션 환경입니다. 완전한 기능을 갖춘 이 설계 및 시뮬레이션 제품군은 Cadence®의 아날로그 분석 엔진을 사용합니다. 무료로 제공되는 TI용 PSpice에는 아날로그 및 전력 포트폴리오뿐 아니라 아날로그 행동 모델에 이르기까지 업계에서 가장 방대한 모델 라이브러리 중 하나가 포함되어 있습니다.

TI 설계 및 시뮬레이션 환경용 PSpice는 기본 제공 라이브러리를 이용해 복잡한 혼합 신호 설계를 시뮬레이션할 수 있습니다. 레이아웃 및 제작에 (...)
패키지 CAD 기호, 풋프린트 및 3D 모델
WQFN (RTV) 32 Ultra Librarian

주문 및 품질

포함된 정보:
  • RoHS
  • REACH
  • 디바이스 마킹
  • 납 마감/볼 재질
  • MSL 등급/피크 리플로우
  • MTBF/FIT 예측
  • 물질 성분
  • 인증 요약
  • 지속적인 신뢰성 모니터링
포함된 정보:
  • 팹 위치
  • 조립 위치

권장 제품에는 본 TI 제품과 관련된 매개 변수, 평가 모듈 또는 레퍼런스 디자인이 있을 수 있습니다.

지원 및 교육

TI 엔지니어의 기술 지원을 받을 수 있는 TI E2E™ 포럼

콘텐츠는 TI 및 커뮤니티 기고자에 의해 "있는 그대로" 제공되며 TI의 사양으로 간주되지 않습니다. 사용 약관을 참조하십시오.

품질, 패키징, TI에서 주문하는 데 대한 질문이 있다면 TI 지원을 방문하세요. ​​​​​​​​​​​​​​

동영상