Electronic Components Datasheet Search
  English  ▼

Delete All


Preview PDF HTML

LM4540 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM4540
Description  AC ’97 Codec with National 3D Sound
Download  16 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com

LM4540 Datasheet(HTML) 1 Page - National Semiconductor (TI)

Zoom Inzoom in Zoom Outzoom out
 1 / 16 page
background image
AC ’97 Codec with National 3D Sound
General Description
The LM4540 is an audio codec for PC systems which per-
forms the analog-intensive function of the Analog Codec ’97
Rev 1.03 architecture. Using 18-Bit
Σ∆ A/D and D/A convert-
ers, 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 se-
rial 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 in-
creased overall performance.
Key Specifications
n Analog Mixer Dynamic Range
95dB (typ)
n D/A Dynamic Range
89dB (typ)
n A/D Dynamic Range
90dB (typ)
n Audio Codec ’97 compliant
n Stereo 18-Bit
Σ∆ A/D’s and D/A’s with 128X
n National’s 3D Sound circuitry
n Power management support
n Digital Interface 3V and 5V compliant
n PC Audio Systems Requiring Only 2 Stereo Inputs (CD,
Line) and 3 Mono Inputs (Mic, Phone, PC Beep)
Block Diagram
FIGURE 1. LM4540 Block Diagram
February 1999
© 1999 National Semiconductor Corporation

Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16 

Datasheet Download

Link URL

Privacy Policy
Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Alldatasheet API   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com

Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn