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参数资料
| 型号： | LM4546MWC |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, UUC |
| 封装： | WAFER |
| 文件页数： | 8/20页 |
| 文件大小： | 356K |
| 代理商： | LM4546MWC |
Application Information (Continued)
When the AC Link
″Codec Ready″ indicator bit (SDATA_IN
slot 0, bit 15) is a
″1″, it indicates that the AC Link and AC ’97
registers are in a fully operational state. The AC ’97 Control-
ler must further probe the Powerdown Control / Status Reg-
ister to determine exactly which subsections are ready.
BIT
Function
REF
Vref’s up to nominal level
ANL
Analog mixers ready
DAC
DAC section ready to accept data
ADC
ADC section ready to transmit data
Supported powerdown modes.
BIT
Function
PRO
PCM in ADC’s and Input Mux powerdown
PR1
PCM out DAC’s powerdown
PR2
Analog Mixer powerdown (VREF still on)
PR3
Analog Mixer powerdown (VREF off)
PR4
Digital Interface (AC Link) powerdown
(external clk off)
PR5
Internal Clk disable
PR6
not used
Extended Audio ID Register (28h)
This read only register identifies which AC97 Extended Au-
dio features are supported. The LM4546 provides for VRA
(Variable Rate Audio) and Multiple Codec support. VRA is in-
dicated by a
″1″ in the LSB of register 28h. The two MSB’s,
ID1 and ID0, show the current codec configuration as con-
nected via external pins 45 and 46.
Pin46 (ID1)
Pin45 (ID0)
Reg 28h ID1
Reg 28h ID0
Codec Mode
NC (not
connected)
NC (not
connected)
00
Primary
GND
0
Primary
Pin46 (ID1)
Pin45 (ID0)
Reg 28h ID1
Reg 28h ID0
GND
DVdd
0
1
DVdd
GND
1
0
DVdd
1
Extended Audio Status/Control Register (2Ah)
This read/write register provides status and control of the
Variable Sample Rate function. Setting the LSB of this regis-
ter to
″1″ enables Variable Rate Audio (VRA) mode and al-
lows DAC and ADC sample rates to be programmed via reg-
isters 2Ch and 32h.
BIT
Function
VRA
0 = VRA off (48kHz fixed), 1 = VRA on
Sample Rate Control Registers (2Ch, 32h)
These read/write registers are used to set the sample rate
for the left and right channels of the DAC (2Ch) and the ADC
(32h). When Variable Rate Audio is enabled via bit-0 of Reg-
ister 2Ah, the sample rates can be programmed, in 1Hz in-
crements, to be any value from 4kHz to 48kHz. Below is a list
of the most common sample rates and their corresponding
register values.
SR15:SR0
Sample Rate (Hz)
1F40h
8000
2B11h
11025
3E80h
16000
5622h
22050
AC44h
44100
BB80h
48000
Reserved Registers
Do not write to these registers as they are reserved.
LM4546
www.national.com
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相关代理商/技术参数 |
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|---|---|
| LM4546VH | 制造商:Texas Instruments 功能描述:SPECIALTY CONSUMER CIRCUIT, PQFP48 |
| LM4547VH | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Soundcard Circuits |
| LM4548 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:AC ’97 Rev 2 Codec with Sample Rate Conversion and National 3D Sound |
| LM4548A | 制造商:NSC 制造商全称:National Semiconductor 功能描述:AC ’97 Rev 2 Multi-Channel Audio Codec with Sample Rate Conversion and National 3D Sound |
| LM4548AVH | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
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