參數(shù)資料
型號(hào)： LM4550
廠商： National Semiconductor Corporation
元件分類： Codec
英文描述： AC ’97 Rev 2.1 Multi-Channel Audio Codec with Stereo Headphone Amplifier, Sample Rate Conversion and National 3D Sound
中文描述： 交流\u0026#39;97活2.1多聲道音頻編解碼器的立體聲耳機(jī)放大器，采樣率轉(zhuǎn)換和國(guó)家3D聲音
文件頁(yè)數(shù)： 1/25頁(yè)
文件大小： 507K
代理商： LM4550
LM4550
AC ’97 Rev 2.1 Multi-Channel Audio Codec with Stereo
Headphone Amplifier, Sample Rate Conversion and
National 3D Sound
General Description
The LM4550 is an audio codec for PC systems which is fully
PC99 compliant and performs the analog intensive functions
of the AC97 Rev2.1 architecture. Using 18-bit Sigma-Delta
A/D’s and D/A’s, the LM4550 provides 90 dB of Dynamic
Range.
The LM4550 was designed specifically to provide a high
quality audio path and provide all analog functionality in a PC
audio system. It features full duplex stereo A/D’s and D/A’s
and an analog mixer with 4 stereo and 3 mono inputs, each
of which has separate gain, attenuation and mute control.
The LM4550 provides a stereo headphone amplifier with an
independent gain control and also supports National’s 3D
Sound stereo enhancement and variable sample rate con-
version. The sample rate for the A/D and D/A can be pro-
grammed separately with a resolution of 1 Hz to convert any
rate between 4 kHz–48 kHz.
The LM4550 features the ability to connect several codecs
together in a system to provide up to six channels for sur-
round sound applications. Multiple codec systems can be
built using the standard AC-Link format of one serial data
stream per codec, or using a unique National Semiconductor
feature for chaining codecs together. This chain feature re-
quires only a single data stream to the controller.
TheAC97 architecture separates the analog and digital func-
tions of the PC audio system allowing both for system design
flexibility and increased performance.
Key Specifications
n
Analog Mixer Dynamic Range
n
D/A Dynamic Range
n
A/D Dynamic Range
n
Headphone Amp THD+N at 50 mW
into 32
97dB (typ)
89dB (typ)
90dB (typ)
0.02% (typ)
Features
n
AC’97 Rev 2.1 compliant
n
Several LM4550s can be combined together for up to 6
channel operation
n
Unique National chaining function allows multiple codecs
to be connected serially and use only a single controller
SDATA_IN pin
n
High quality Sample Rate Conversion (SRC) from 4 kHz
to 48 kHz in 1 Hz increments.
n
Stereo headphone amp with separate gain control
n
National’s 3D Sound circuitry
n
External Amplifier Power Down (EAPD) control from
codec
n
PC-Beep passthrough to Line Out while reset is held
active low
n
Digital 3.3V and 5V compliant
Applications
n
Desktop PC audio systems on PCI cards, AMR cards, or
with motherboard chips sets featuring AC-Link
n
Portable PC systems as on MDC cards, or with a
chipset or accelerator featuring AC-Link
n
2, 4, or 6 channel systems
December 2002
L
R
2002 National Semiconductor Corporation
DS100972
www.national.com
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM4550B 制造商:NSC 制造商全稱:National Semiconductor 功能描述:AC 97 Rev 2.1 Multi-Channel Audio Codec with Stereo Headphone Amplifier, Sample Rate Conversion and National 3D Sound
LM4550BVH 功能描述:接口—CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel
LM4550BVH/NOPB 功能描述:接口—CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel
LM4550BVH/NOPB 制造商:Texas Instruments 功能描述:Audio Codec IC
LM4550BVHX 功能描述:接口—CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel
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