參數(shù)資料
型號(hào)： LM4550
廠商： National Semiconductor Corporation
元件分類(lèi)： 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)： 23/25頁(yè)
文件大?。?/td> 507K
代理商： LM4550
Secondary Codec Register Access Definitions
(Continued)
Reg 28h & Multiple Codec Option:
Reg
28h
Name
Extended
Audio ID
D15 D14
ID1
D13
x
D12
x
D11
x
D10
x AMAP
D9
D8
D7
D6
D5
x
D4
x
D3
D2
x
D1
D0
VRA
Default
xxxxh
ID0
The AMAP bit, D9 in the Extended Audio ID Register (registers 28h), indicates whether or not the audio Codec supports Optional
AC’97 2.1 compliantAC-link slot to audio DAC mappings.AMAP = 1 in D9 indicates that the default (following cold or warm reset)
Codec slot to DAC mappings (configured via hardwirings, strap pin(s), or other methods) comform to the table below.
Codec Mode
Pin 46 (ID1)
Pin 45 (ID0)
Reg 28h ID1
Reg 28h ID0
PCM Left DAC
uses data from
slot #
PCM Right DAC
uses data from
slot #
4
4
8
9
Primary
Secondary 1
Secondary 2
Secondary 3
NC/DV
DD
NC/DV
DD
GND
GND
NC/DV
DD
GND
NC/DV
DD
GND
0
0
1
1
0
1
0
1
3
3
7
6
CHAIN_IN
Using National Semiconductor’s unique feature for chaining together codecs, a multiple codec system can be built. This chain
feature requires only a single stream back to the controller. By setting the two LSBs of register 74h to something other than the
codec ID, the codec stops sending its own SDATA_IN signal and instead passes the signal connected here out the SDATA_IN
pin. When the CHAIN_IN feature is used, another codec’s SDATA_IN pin should be connected here, or else this pin should be
grounded to prevent the possibility of floating the SDATA_IN signal at the controller. Reg 74h is updated at the rising edge of
SYNC.
L
www.national.com
23
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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(chēng):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(lèi)型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類(lèi)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(lèi)型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類(lèi)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(lèi)型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類(lèi)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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