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LM4549B Datasheet(PDF) 14 Page - Texas Instruments |
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LM4549B Datasheet(HTML) 14 Page - Texas Instruments |
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14 / 42 page  $ $ $ MIC1 AUX MIC2 R E C O R D S E L E C T M U X CD VIDEO LINE_IN PHONE PC_BEEP LINE_OUT LNLVL_OUT MONO_OUT EAPD RESET# SDATA_OUT SYNC BIT_CLK SDATA_IN XTAL_OUT XTAL_IN ID0# ID1# * * $ MIX2 + MIX1 STEREO SIGNAL PATH MONO SIGNAL PATH Gain Attenuation Mute (Mute is default) NN Address of Analog Input Volume Control Register NN (HEX) G A M * Asterisk denotes default setting after Cold Reset DIGITAL SIGNAL PATH 18 18 18 18 16 Control bit m in Register with hexadecimal address NN Dm, NNh Control Register with hexadecimal address NN NNh $DAC $DAC $ADC $ADC 18h * GAIN: D6,0Eh *0 dB/20 dB $&¶97 REGISTERS CODEC IDENTITY SELECT D13, 20h NATIONAL 3D SOUND GAIN ATTEN MUTE 1Ch GAIN MUTE Atten Mute MONO VOLUME: 06h Atten Mute LINE LEVEL VOLUME: 04h Atten Mute MASTER VOLUME: 02h G A M 0C G A M 0A A M 0E G A M 10 G A M 12 G A M 14 G A M 16 G A M POWER SUPPLY and REFERENCES MONO MIX MIX STEREO MIX 3D POP MS * LM4549B SNAS598B – JULY 2012 – REVISED JULY 2015 www.ti.com 8 Detailed Description 8.1 Overview The LM4549B codec can mix, process and convert among analog (stereo and mono) and digital (AC Link format) inputs and outputs. There are four stereo and four mono analog inputs and two stereo and one mono analog outputs. A single codec supports data streaming on two input and two output channels of the AC Link digital interface simultaneously. 8.2 Functional Block Diagram 8.3 Feature Description 8.3.1 ADC Inputs and Outputs All four of the stereo analog inputs and three of the mono analog inputs can be selected for conversion by the 18-bit stereo ADC. Digital output from the left and right channel ADCs is always located in AC Link Input Frame slots 3 and 4 respectively. Input level to either ADC channel can be muted or adjusted from the Record Gain register, 1Ch. Adjustments are in 1.5 dB steps over a gain range of 0 dB to +22.5 dB and both channels mute together (mute bit D15). Input selection for the ADC is through the Record Select Mux controlled from the Record Select register, 1Ah, together with microphone selection controlled by the MS bit (bit D8) in the General Purpose register, 20h. One of the stereo inputs, CD_IN, uses a quasi-differential 3-pin interface where both stereo channel inputs are referenced to the third pin, CD_GND. CD_GND should be AC coupled to the source ground and provides common-mode feedback to cancel ground noise. It is not a DC ground. The other three stereo inputs, LINE_IN, AUX and VIDEO are 2-pin interfaces, single-ended for each stereo channel, with analog ground 14 Submit Documentation Feedback Copyright © 2012–2015, Texas Instruments Incorporated Product Folder Links: LM4549B |
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