參數(shù)資料
型號(hào)： LM4550BVH/NOPB
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 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: 250/Tray
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP48
封裝： 7 X 7 MM, 1.40 MM HEIGHT, ROHS COMPLIANT, LQFP-48
文件頁(yè)數(shù)： 4/31頁(yè)
文件大小： 998K
代理商： LM4550BVH/NOPB
Pin Descriptions (Continued)
ANALOG I/O (Continued)
Name
Pin
I / O
Functional Description
HP_OUT_L
39
O
Left Stereo Channel Output
This line level output (1 Vrms nominal) is fed from the left channel of the Stereo Mix signal
from MIX2 via the Headphone Volume register, 04h. The HP_OUT_L amplitude can be muted
(along with HP_OUT_R) or adjusted from 0 dB to - 46.5 dB in 1.5 dB steps
HP_OUT_C
40
I
AC Ground Reference
In normal use, this input is the AC ground reference for HP_OUT_L and HP_OUT_R. It must
be capacitively coupled to analog ground with short traces to maximize performance. It is
NOT a DC ground.
For non-stereo applications it may also be used to provide common-mode feedback with
HP_OUT configured as one differential output rather than as outputs for two single-ended
stereo channels.
HP_OUT_R
41
O
Right Stereo Channel Output
This line level output (1 Vrms nominal) is fed from the right channel of the Stereo Mix signal
from MIX2 via the Headphone Volume register, 04h. The HP_OUT_R amplitude can be muted
(along with HP_OUT_L) or adjusted from 0 dB to - 46.5 dB in 1.5 dB steps
DIGITAL I/O AND CLOCKING
Name
Pin
I / O
Functional Description
XTL_IN
2
I
24.576 MHz crystal or external oscillator input
To complete the oscillator circuit use a fundamental mode crystal operating in parallel
resonance and connect a 1M
resistor across pins 2 and 3. Choose the load capacitors
(Figure 2, C1, C2) to suit the load capacitance required by the crystal (e.g. C1=C2=33pF
for a 20 pF crystal. Assumes that each ’Input + trace’ capacitance is 7 pF).
This pin may also be used as the input for an external oscillator (24.576 MHz nominal) at
standard logic levels (V
IH,VIL).
This pin is only used when the codec is in Primary mode. It may be left open (NC) for any
Secondary mode.
XTL_OUT
3
O
24.576 MHz crystal output
Used with XTAL_IN to configure a crystal oscillator.
When the codec is used with an external oscillator this pin should be left open (NC).
When the codec is configured in a Secondary mode this pin is not used and may be left open
(NC).
SDATA_OUT
5
I
Input to codec
This is the input for AC Link Output Frames from an AC ’97 Digital Audio Controller to the
LM4550B codec. These frames can contain both control data and DAC PCM audio data. This
input is sampled by the LM4550B on the falling edge of BIT_CLK.
BIT_CLK
6
I/O
AC Link clock
An OUTPUT when in Primary Codec mode. This pin provides a 12.288 MHz clock for the AC
Link. The clock is derived (internally divided by two) from the 24.576 MHz signal at the crystal
input (XTL_IN).
This pin is an INPUT when the codec is configured in any of the Secondary Codec modes
and would normally use the AC Link clock generated by a Primary Codec.
SDATA_IN
8
O
Output from codec
This is the output for AC Link Input Frames from the LM4550B codec to an AC ’97 Digital
Audio Controller. These frames can contain both codec status data and PCM audio data from
the ADCs. The LM4550B clocks data from this output on the rising edge of BIT_CLK.
LM4550B
www.national.com
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相關(guān)PDF資料
PDF描述
LM4550BVHX/NOPB 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
LM4562NA/NOPB LM4562 Dual High Performance, High Fidelity Audio Operational Amplifier; Package: MDIP; No of Pins: 8; Qty per Container: 40/Rail
LM45BIM3/NOPB LM45 SOT-23 Precision Centigrade Temperature Sensors; Package: SOT-23; No of Pins: 3; Qty per Container: 1000/Reel
LM45BIM3X/NOPB LM45 SOT-23 Precision Centigrade Temperature Sensors; Package: SOT-23; No of Pins: 3; Qty per Container: 3000/Reel
LM45CIM3/NOPB LM45 SOT-23 Precision Centigrade Temperature Sensors; Package: SOT-23; No of Pins: 3; Qty per Container: 1000/Reel
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM4550BVHX 功能描述:接口—CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型: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
LM4550BVHX/NOPB 功能描述:接口—CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型: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
LM4550BVHX/S5001320 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述:
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 安裝類型:表面貼裝 封裝/外殼:48-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-TQFN-EP（7x7） 包裝:帶卷 (TR)
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