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參數(shù)資料
| 型號： | LM4548VHX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP48 |
| 封裝： | 7 X 7 MM, 1.40 MM HEIGHT, TQFP-48 |
| 文件頁數(shù)： | 4/17頁 |
| 文件大小： | 328K |
| 代理商： | LM4548VHX |
Application Information
AC Link Serial Interface Protocol
AC Link Output Frame: SDATA_OUT (output from
controller, input to LM4548)
The audio output frame (output from AC ’97 Controller) con-
tains control and PCM data targeted for the LM4548 control
registers and stereo DAC. The Tag slot, slot 0, contains 16
bits that tell the AC Link interface circuitry on the LM4548 the
validity of the following data slots.
A new audio output 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 AC ’97
Controller drives SDATA_OUT with the first bit of slot 0. The
LM4548 samples SDATA_OUT on the falling edge of BIT-
_CLK. The AC ’97 Controller will continue outputting the
SDATA_OUT stream on each successive rising edge of BIT-
_CLK.
SDATA_OUT Slot 0: Tag Phase
The first bit of slot 0 is designated the
″Valid Frame″ bit. If
this bit is 1, it indicates that the current data frame contains
at least one slot of valid data and the LM4548 will further
sample the next four bits to determine which frames do in
fact have valid data. Valid slots are signified bya1in their re-
spective slot bit position.
Bit
Description
Comment
15
Valid Frame
1 = This frame has valid
data.
14
Control
register
address
1 = Control Address is
valid.
13
Control
register data
1 = Control Data is valid.
12
Left Playback
PCM Data
1 = Left PCM Data is
valid.
DS100987-4
FIGURE 3. AC 97 Bidirectional Audio Frame
DS100987-6
FIGURE 4. AC Link Audio Output Frame
DS100987-5
FIGURE 5. Start of Audio Output Frame
LM4548
www.national.com
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM4549 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:AC ’97 Rev 2.1 Codec with Sample Rate Conversion and National 3D Sound |
| LM4549A | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:AC ’97 Rev 2.1 Codec with Sample Rate Conversion and National 3D Sound |
| LM4549AVH | 制造商:Rochester Electronics LLC 功能描述:AC97 REV2.1 CODEC - Bulk 制造商:OC White Company 功能描述:Audio Codec 2ADC / 2DAC 18-Bit 48-Pin LQFP Tray |
| LM4549AVH WAF | 制造商:Texas Instruments 功能描述: |
| LM4549AVH/NOPB | 制造商:Texas Instruments 功能描述:Audio Codec 2ADC / 2DAC 18-Bit 48-Pin LQFP Tray |
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