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參數(shù)資料
| 型號(hào)： | LM4540 |
| 廠商： | National Semiconductor Corporation |
| 元件分類(lèi)： | Codec |
| 英文描述： | AC ’97 Codec with National 3D Sound |
| 中文描述： | 編解碼器與交流\u0026#39;97全國(guó)3D聲音 |
| 文件頁(yè)數(shù)： | 13/16頁(yè) |
| 文件大?。?/td> | 298K |
| 代理商： | LM4540 |
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Application Information
(Continued)
Bit
Description
Right
Playback
PCM Data
Comment
11
1 = Valid slot
SD_OUT Slot 1: Control Address
Slot 1 is used both to write to the LM4540 registers as well
as read back a register’s current value. The MSB of Slot 1
(bit 19) signifies whether the current control operation is a
read or a write. BIts 18 through 12 are used to specify the
register address of the read or write operation. The least sig-
nificant twelve bits are reserved and should be stuffed with
zeros by the AC’97 controller.
Bits
19
Description
Read/Write
Control
Register
Reserved
Comment
0 = Write, 1 = Write
Identifies the Control
Register
Set to
″
0
″
18:12
11:0
SD_OUT Slot 2: Control Data
Slot 2 is used to transmit 16 bit control data to the LM4540 in
the event that the current operation is a write operation. The
least significant four bits should be stuffed with zeros by the
AC ’97 controller. If the current operation is a register read,
the entire slot, bits 19 through 0 should be stuffed with zeros.
Bits
Description
Control
Register Write
Data
Reserved
Comment
19:4
Set bits to
″
0
″
if read
operation
3:0
Set to
″
0
″
SD_OUT Slot 3: PCM Playback Left Channel
Slot 3 is a 20 bit field used to transmit data intended for the
left DAC on the LM4540. Any unused bits should be padded
with zeros. The LM4540 DAC’s have 18 bit resolution and
thus will use the first 18 bits of the 20 bit PCM stream.
Bits
Description
PCM Audio
Data for Left
DAC
Comment
19:0
Set unused bits to
″
0
″
SD_OUT Slot 4: PCM Playback Right Channel
Slot 4 is a 20 bit field used to transmit data intended for the
right DAC on the LM4540. Any unused bits should be pad-
ded with zeros. The LM4540 DAC’s have 18 bit resolution
and thus will use the first 18 bits of the 20 bit PCM stream.
Bits
Description
PCM Audio
Data for Right
DAC
Comment
19:0
Set unused bits to
″
0
″
SD_OUT Slots 5-12: Reserved
Set these SD_OUT slots to
″
0
″
as they are not currently
used and are reserved for future use.
AC Link Input Frame
The audio input frame (input to the AC ’97 Digital Controller)
contains status and PCM data from the LM4540 control reg-
isters and stereo ADC. The Tag slot, slot 0, contains 16 bits
that tell the AC ’97 Digital Controller whether the LM4540 is
ready and the validity of data from certain device subsec-
tions.
A new audio input frame is signaled with a low to high tran-
sition of SYNC. SYNC is synchronous to the rising edge of
BIT_CLK. On the next rising edge of BIT_CLK, the LM4540
drives SD_IN with the first bit of slot 0. The Digital Controller
samples SD_IN on the falling edge of BIT_CLK. The
LM4540 will continue outputting the SD_IN stream on each
successive rising edge of BIT_CLK. The LM4540 outputs
data MSB first, in a MSB justified format. All reserved bits
and slots are stuffed with
″
0
″
’s by the LM4540.
SD_IN Slot 0: Codec Status Bits
The first bit of SD_IN Slot 0 (bit 15), if asserted (=
″
1
″
), indi-
cates that the Codec is ready. The digital controller must
probe further to see which other subsections are ready.
DS100906-8
FIGURE 6. AC Link Audio Input Frame
www.national.com
13
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM4540VH | AC ’97 Codec with National 3D Sound |
| LM4543 | AC ’97 Codec with National 3D Sound |
| LM4543VH | AC ’97 Codec with National 3D Sound |
| LM4545 | AC ’97 Codec with Stereo Headphone Amplifier and National 3D Sound |
| LM4545VH | AC ’97 Codec with Stereo Headphone Amplifier and National 3D Sound |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM4540VH | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述: |
| LM4540VHX | 功能描述:IC AUDIO CODEC '97 18BIT 48LQFP RoHS:是 類(lèi)別:集成電路 (IC) >> 接口 - 編解碼器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類(lèi)型:立體聲音頻 數(shù)據(jù)接口:串行 分辨率（位）:18 b ADC / DAC 數(shù)量:2 / 2 三角積分調(diào)變:是 S/N 比，標(biāo)準(zhǔn) ADC / DAC (db):81.5 / 88 動(dòng)態(tài)范圍，標(biāo)準(zhǔn) ADC / DAC (db):82 / 87.5 電壓 - 電源，模擬:2.6 V ~ 3.3 V 電壓 - 電源，數(shù)字:1.7 V ~ 3.3 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:48-WFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:48-TQFN-EP（7x7） 包裝:帶卷 (TR) |
| LM4543 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:AC ’97 Codec with National 3D Sound |
| LM4543VH | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| LM4545 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:AC ’97 Codec with Stereo Headphone Amplifier and National 3D Sound |
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