LM4548VHNOPB National Semiconductor, LM4548VHNOPB Datasheet
LM4548VHNOPB
Specifications of LM4548VHNOPB
Related parts for LM4548VHNOPB
LM4548VHNOPB Summary of contents
Page 1
... The AC97 architecture separates the analog and digital functions of the PC audio system allowing both for system design flex- ibility and increased performance. Block Diagram © 2000 National Semiconductor Corporation Key Specifications h Analog Mixer Dynamic Range h ...
Page 2
... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Storage Temperature Input Voltage ESD Susceptibility (Note 5) pins 27, 28 pin 3 ESD Susceptibility (Note 6) pin 3 Junction Temperature Electrical Characteristics The following specifications apply for AV Limits apply for T = 25˚ ...
Page 3
Electrical Characteristics The following specifications apply for AV Limits apply for T = 25˚C. The reference for 0dB is 1Vrms unless otherwise specified. A Symbol Parameter Analog to Digital Converters Dynamic Range (Note 2) Frequency Response Digital to Analog Converters ...
Page 4
Electrical Characteristics The following specifications apply for AV Limits apply for T = 25˚C. The reference for 0dB is 1Vrms unless otherwise specified. A Symbol Parameter Digital Timing Specifications (Note 2) T SYNC active high pulse width SH T SYNC ...
Page 5
Timing Diagrams Clocks DS100987-10 Data Setup and Hold DS100987-11 Digital Rise and Fall DS100987-12 Cold Reset Warm Reset 5 DS100987-13 DS100987-14 www.national.com ...
Page 6
Typical Application www.national.com FIGURE 2. LM4548 Typical Application Circuit 6 DS100987-3 ...
Page 7
Connection Diagram Pin Description Analog I/O Name Pin Functional Description This is a mono input which gets summed into both the stereo line out and the true line level PC_BEEP 12 I out after the National 3D ...
Page 8
Pin Description (Continued) Analog I/O (Continued) Name Pin Functional Description This line level input can be routed through the Input Mux and recorded by the right ADC. In addition, this analog input gets summed into the right ...
Page 9
Pin Description (Continued) Digital I/O and Clocking Name Pin 24.576 MHz crystal input. Use a fundamental-mode type crystal. When operating from a XTL_IN 2 I crystal 24.576 MHz crystal output. When operating from a crystal, ...
Page 10
Typical Performance Characteristics ADC Noise Floor DS100987-15 ADC Frequency Response DS100987-19 www.national.com DAC Noise Floor DS100987-16 DAC Frequency Response DS100987-20 10 Analog Loopthru Noise Floor DS100987-18 True Line Level Out Noise Floor (Analog Loopthrough) DS100987-18 ...
Page 11
11 www.national.com ...
Page 12
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 ...
Page 13
Application Information Bit Description Right 1 = Right PCM Data is 11 Playback PCM Data SDATA_OUT Slot 1: Control Address Slot 1 is used both to write to the LM4548 registers as well as read back a register’s current value. ...
Page 14
Application Information FIGURE 7. Start of Audio Input Frame Bit Description Codec Ready 15 0=Not Ready, 1=Ready Bit Slot 1 data 14 Status Address is valid valid Slot 2 data 13 Status Data is valid valid Slot 3 data Left ...
Page 15
Application Information Register Descriptions Reset Register (00h) Writing any value to this register causes a register reset which changes all of the registers back to their default val- ues read is performed on this register, the LM4548 will ...
Page 16
Application Information When the AC Link Codec Ready indicator bit (SDATA_IN slot 0, bit 15 indicates that the AC Link and AC ’97 registers are in a fully operational state. The AC ’97 Control- ler ...
Page 17
... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...