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PDF LM4545 Data sheet ( Hoja de datos )
| Número de pieza | LM4545 | |
| Descripción | AC 97 Codec with Stereo Headphone Amplifier and National 3D Sound | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM4545 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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PRELIMINARY
July 1999
LM4545
AC ’97 Codec with Stereo Headphone Amplifier and
National 3D Sound
General Description
The LM4545 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 LM4545 provides 90dB of dynamic range.
The LM4545 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 4 stereo and 3 mono inputs, each
of which has separate gain, attenuation and mute control. In
addition, the LM4545 provides a stereo headphone amplifier
with an independent gain control and National’s 3D Sound
stereo enhancement technology.
The LM4545 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
n D/A Dynamic Range
n A/D Dynamic Range
n Headphone THD+N at 50mW into 32Ω
95dB (typ)
89dB (typ)
90dB (typ)
0.02% (typ)
Features
n Audio Codec ’97 compliant
n Stereo 18-Bit Σ∆ A/D’s and D/A’s with 128X
oversampling
n Stereo headphone amp with separate gain control
n National’s 3D Sound circuitry
n Power management support
n Digital Interface 3V and 5V compliant
Applications
n Desktop PC Audio Systems
n Portable PC Audio Systems
n Mobile PC Audio Solutions
Block Diagram
FIGURE 1. LM4545 Block Diagram
© 1999 National Semiconductor Corporation DS100069
DS100069-1
www.national.com
1 page  
Timing Diagrams
Clocks
Data Setup and Hold
DS100069-10
Digital Rise and Fall
DS100069-11
Cold Reset
DS100069-12
Warm Reset
DS100069-13
DS100069-14
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5 Page 
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| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LM4545.PDF ] | |
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