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LM4540 Dataheets PDF



Part Number LM4540
Manufacturers National Semiconductor
Logo National Semiconductor
Description AC97 Codec
Datasheet LM4540 DatasheetLM4540 Datasheet (PDF)

LM4540 AC ’97 Codec with National 3D Sound February 1999 LM4540 AC ’97 Codec with National 3D Sound General Description The LM4540 is an audio codec for PC systems which performs the analog-intensive function of the Analog Codec ’97 Rev 1.03 architecture. Using 18-Bit Σ∆ A/D and D/A converters, the LM4540 provides 90dB of dynamic range. The LM4540 was designed specifically to provide a high quality audio path and provide all analog functionality in a PC audio system. It features full duplex st.

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LM4540 AC ’97 Codec with National 3D Sound February 1999 LM4540 AC ’97 Codec with National 3D Sound General Description The LM4540 is an audio codec for PC systems which performs the analog-intensive function of the Analog Codec ’97 Rev 1.03 architecture. Using 18-Bit Σ∆ A/D and D/A converters, the LM4540 provides 90dB of dynamic range. The LM4540 was designed specifically to provide a high quality audio path and provide all analog functionality in a PC audio system. It features full duplex stereo A/D’s and D/A’s and an analog mixer with 2 stereo and 3 mono inputs, each of which has separate gain, attenuation and mute control. In addition, the LM4540 provides National’s 3D Sound stereo enhancement technology. The LM4540 features AC-Link, a synchronous, fixed rate serial bus for connection to the digital AC ’97 Controller. The separation of the analog and digital functions of the AC ’97 architecture allows for system design flexibility and increased overall performance. Key Specifications n Analog Mixer Dynamic Range n D/A Dynamic Range n A/D Dynamic Range 95dB (typ) 89dB (typ) 90dB (typ) Features n Audio Codec ’97 compliant n Stereo 18-Bit Σ∆ A/D’s and D/A’s with 128X oversampling n National’s 3D Sound circuitry n Power management support n Digital Interface 3V and 5V compliant Applications n PC Audio Systems Requiring Only 2 Stereo Inputs (CD, Line) and 3 Mono Inputs (Mic, Phone, PC Beep) Block Diagram DS100906-1 FIGURE 1. LM4540 Block Diagram © 1999 National Semiconductor Corporation DS100906 www.national.com Absolute Maximum Ratings (Note 3) 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 Soldering Information 6.0V −65˚C to +150˚C −0.3V to VDD +0.3V 2500V 1500V 750V 200V 100V 150˚C TQFP Package Vapor Phase (60 sec.) Infrared (15 sec.) See AN-450 ″Surface Mounting and their Effects on Product Reliability″ for other methods of soldering surface mount devices. θJA (typ) — VBH48A 74˚C/W 215˚C 220˚C Operating Ratings Temperature Range TMIN ≤ TA ≤ TMAX Analog Supply Range Digital Supply Range −40˚C ≤ TA ≤ 85˚C 4.2V ≤ AVDD ≤ 5.5V 3.0V ≤ DVDD ≤ 5.5V Electrical Characteristics (Notes 1, 3) The following specifications apply for AVDD = 5V, DVDD = 5V unless otherwise noted. Limits apply for TA= 25˚C. The reference for 0dB is 1Vrms unless otherwise specified. Symbol Parameter Conditions LM4540 Typical (Note 7) AVDD DVDD IDDD Analog Supply Range Digital Supply Range Digital Quiescent Power Supply Current Analog Quiescent Power Supply Current Shutdown Current Reference Voltage Power Supply Rejection Ratio CD Input to Line Output, -60dB Input THD+N, A-Weighted VO = -3dB, f = 1kHz, RL = 10kΩ DVDD = 5V DVDD = 3.3V IDDA ISD VREF PSRR 38 20 55 1.5 2.23 40 Limit (Note 8) 4.2 5.5 3.0 5.5 V (m.


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