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參數(shù)資料
| 型號： | LM4921ITLX/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PBGA20 |
| 封裝： | MICRO, SMD-20 |
| 文件頁數(shù)： | 1/20頁 |
| 文件大小： | 457K |
| 代理商： | LM4921ITLX/NOPB |
November 2004
LM4921
Low Voltage I2S 16-Bit Stereo DAC with Stereo Headphone
Power Amplifiers and Volume Control
General Description
The LM4921 combines a 16-bit resolution stereo I2S input
digital-to-analog converter (DAC) with a stereo headphone
audio power amplifier. It is primarily designed for demanding
applications in mobile phones and other portable communi-
cation device applications. The LM4921 features an I2S serial
interface for the digital audio information and a 16-bit SPI se-
rial interface for internal register control and communication.
With AV
DD and DVDD = 3.0VDC and driving a 32 single-end-
ed load to a 26mW
RMS output level the distortion (THD+N) of
the LM4921 will be less than 0.5%. The LM4921 also features
a programmable 32-step digital volume control accessed
through an SPI interface.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. It is, therefore, ideally suited for mobile
phone and other low voltage applications where minimal pow-
er consumption is a primary requirement.
The LM4921 features a low-power consumption shutdown
mode, and also has an internal thermal shutdown protection
mechanism.
Key Specifications
■
PSRR at 217Hz, A/DV
DD = 3V, (Fig. 1)
52dB (typ)
■P
OUT at AVDD = 3.0V, 32
< 0.05% THD
13mW (typ)
< 0.5% THD
26mW (typ)
■Supply voltage range
DV
DD
2.6V to 5.0V
AV
DD (Note 8)
2.6V to 5.5V
■Shutdown current
1A (typ)
Features
■ 16-bit resolution stereo DAC
■ I2S digital audio data serial interface
■ SPI serial interface (control register)
■ Volume Control (32 steps; 1.5 dB increments)
■ Up to 50mW/channel stereo headphone amplifier
■ Zero Crossing Detection for Silent Attenuation Steps
■ 2.6V
DC to 5.0VDC digital supply voltage range
■ 2.6V
DC to 5.5VDC analog supply voltage range (Note 8)
■ Unity-gain stable headphone amplifiers
■ Available in the 20-bump microSMD package
Applications
■ Mobile phones
■ PDAs
■ Portable electronic devices
Boomer is a registered trademark of National Semiconductor Corporation.
2007 National Semiconductor Corporation
200486
www.national.com
LM4921
Low
Voltage
I
2S
16-Bit
Stereo
DAC
with
Stereo
Headphone
Power
Amplifiers
and
Volume
Control
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM4922 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Ground-Referenced, Ultra Low Noise, Fixed Gain, 80mW Stereo Headphone Amplifier |
| LM4922TL | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| LM4922TL/NOPB | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| LM4922TLX/NOPB | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| LM4923 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:1.1 Watt Fully Differential Audio Power Amplifier With Shutdown Select |
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