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LM4548A

Texas Instruments
Part Number LM4548A
Manufacturer Texas Instruments
Description AC97 Rev2 Multi-Channel Codec
Published Aug 22, 2019
Detailed Description OBSOLETE LM4548A www.ti.com SNOS988D – NOVEMBER 2002 – REVISED APRIL 2013 LM4548A AC '97 Rev 2 Multi-Channel Audio C...
Datasheet PDF File LM4548A PDF File

LM4548A
LM4548A

Overview
OBSOLETE LM4548A www.
ti.
com SNOS988D – NOVEMBER 2002 – REVISED APRIL 2013 LM4548A AC '97 Rev 2 Multi-Channel Audio Codec with Sample Rate Conversion and Texas Instruments 3D Sound Check for Samples: LM4548A FEATURES 1 • AC '97 Rev 2 Compliant • High Quality Sample Rate Conversion from 4 kHz to 48 kHz in 1 Hz Increments • Multiple Codec Support • True Line Level Output with Separate Gain Control • Texas Instruments' 3D Sound Stereo Enhancement Circuitry • Advanced Power Management Support • Digital 3.
3V and 5V Supply Options • Extended Temperature: −40°C ≤ TA ≤ 85°C APPLICATIONS • Desktop PC Audio Systems on PCI Cards, AMR Cards, or with Motherboard Chips Sets Featuring AC Link • Portable PC Systems as on MDC Cards, or with a Chipset or Accelerator Featuring AC Link • General and Multi-Channel Audio Frequency Systems KEY SPECIFICATIONS • Analog Mixer Dynamic Range : 97 dB (typ) • DAC Dynamic Range : 89 dB (typ) • ADC Dynamic Range : 90 dB (typ) DESCRIPTION The LM4548A is an audio codec for PC systems which is fully PC98 compliant and performs the analog intensive functions of the AC '97 Rev 2 architecture.
Using 18-bit Sigma-Delta ADCs and DACs, the LM4548A provides 90 dB of Dynamic Range.
The LM4548A 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 ADCs and DACs and analog mixers with access to 4 stereo and 4 mono inputs.
Each mixer input has separate gain, attenuation and mute control and the mixers drive 1 mono and 2 stereo outputs, each with attenuation and mute control.
The LM4548A supports Texas Instruments' 3D Sound stereo enhancement and a comprehensive sample rate conversion capability.
The sample rate for the ADCs and DACs can be programmed separately with a resolution of 1 Hz to convert any rate in the range 4 kHz – 48 kHz.
Sample timing from the ADCs and sample request timing for the DACs are completely deterministic to ease task scheduling and ap...


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