參數(shù)資料
型號(hào)： LM4550BVHX/NOPB
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： 消費(fèi)家電
英文描述： LM4550B AC '97 Rev 2.1 Multi-Channel Audio Codec with Stereo Headphone Amplifier, Sample Rate Conversion and National 3D Sound; Package: LQFP; No of Pins: 48; Qty per Container: 1000/Reel
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP48
封裝： 7 X 7 MM, 1.40 MM HEIGHT, LQFP-48
文件頁(yè)數(shù)： 13/31頁(yè)
文件大?。?/td> 998K
代理商： LM4550BVHX/NOPB
AC Link Serial Interface Protocol
(Continued)
SLOT 2, OUTPUT FRAME
Bits
Description
Comment
19:4
Control
Register Write
Data
Controller should stuff with
zeros if operation is “read”
3:0
Reserved
Set to "0"
SDATA_OUT: Slots3&4 – PCM Playback Left/Right
Channels
Slots 3 and 4 are 20-bit fields used to transmit PCM data to
the left and right channels of the stereo DAC when the codec
is in Primary mode or Secondary mode 1. Any unused bits
should be stuffed with zeros. The LM4550B DACs have
18-bit resolution and will therefore use the 18 MSBs of the
20-bit PCM data (MSB justified). The AC ’97 Rev 2.1 speci-
fication allocates the Left channel of 5.1 Audio to slot 3 and
the Right channel to slot 4.
SLOTS3&4, OUTPUT FRAME
Bits
Description
Comment
19:0
PCM Audio
Data
(Left /Right
Channels)
Slots used to stream data to
DAC when codec is in Primary
or Secondary 1 modes.
Set unused bits to "0"
SDATA_OUT: Slots7&8 – PCM Playback Left/Right
Surround
Slots 7 and 8 are 20-bit fields used to transmit PCM data to
the left and right channels of the stereo DAC when the codec
is in Secondary mode 2. Any unused bits should be stuffed
with zeros. The LM4550B DACs have 18-bit resolution and
will therefore use the 18 MSBs of the 20-bit PCM data (MSB
justified). The AC ’97 Rev 2.1 specification allocates the Left
Surround channel of 5.1 Audio to slot 7 and the Right Sur-
round channel to slot 8.
SLOTS7&8, OUTPUT FRAME
Bits
Description
Comment
19:0
PCM Audio
Data
(Left/Right
Surround)
Slots used to stream data to
DAC when codec is in
Secondary 2 mode.
Set unused bits to "0"
SDATA_OUT: Slots6&9 – PCM Playback (Center/LFE)
Slots 6 and 9 are 20-bit fields used to transmit PCM data to
the left and right channels of the stereo DAC when the codec
is in Secondary mode 3. Any unused bits should be stuffed
with zeros. The LM4550B DACs have 18-bit resolution and
will therefore use the 18 MSBs of the 20-bit PCM data (MSB
justified). The AC ’97 Rev 2.1 specification allocates the
Center channel of 5.1 Audio to slot 6 and the LFE (Low
Frequency Enhancement) channel to slot 9.
SLOTS6&9, OUTPUT FRAME
Bits
Description
Comment
19:0
PCM Audio
Data
(Center/ LFE
Surround)
Slots used to stream data to
DAC when codec is in
Secondary 3 mode.
Set unused bits to "0"
SDATA_OUT: Slots 5, 10, 11, 12 – Reserved
These slots are not used by the LM4550B and should all be
stuffed with zeros by the AC ’97 Controller.
AC LINK INPUT FRAME:
SDATA_IN, CONTROLLER INPUT FROM LM4550B OUTPUT
The AC Link Input Frame contains status and PCM data from
the LM4550B control registers and stereo ADC. Input
Frames are carried on the SDATA_IN signal which is an
input to the AC ’97 Digital Audio Controller and an output
20123708
FIGURE 6. AC Link Input Frame
LM4550B
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM4550C-46 WAF 制造商:Texas Instruments 功能描述:
LM4550VH 功能描述:IC AC '97 CODEC 48-LQFP 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)
LM4550VH WAF 制造商:Texas Instruments 功能描述:
LM4550VH/NOPB 功能描述:IC AC '97 CODEC 48-LQFP 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)
LM4550VHX 制造商:Rochester Electronics LLC 功能描述:AC '97 REV 2.1 CODEC - Bulk
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