LM4548 National Semiconductor, LM4548 Datasheet

LM4548

Manufacturer Part Number

LM4548

Description

AC 97 Rev 2 Codec with Sample Rate Conversion and National 3D Sound

Manufacturer

National Semiconductor

Datasheet

1.LM4548.pdf (18 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

LM4548AVH

Manufacturer:

NS/国半

Quantity:

20 000

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LM4548VH

Manufacturer:

NSC

Quantity:

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LM4548VH

Manufacturer:

National

Quantity:

302

Company:

Meier Automation Equipment Co., Limited

Part Number:

LM4548VH

Manufacturer:

NS/国半

Quantity:

20 000

Current page: 1 of 18
Download datasheet (323Kb)

LM4548

AC ’97 Rev 2 Codec with Sample Rate Conversion and

National 3D Sound

General Description

The LM4548 is an audio codec for PC systems which is fully

PC98 compliant and performs the analog intensive functions

of the AC97 Rev2 architecture. Using 18-bit Sigma-Delta

A/D’s and D/A’s, the LM4548 provides 90dB of Dynamic

Range.

The LM4548 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.

The LM4548 also provides the additional True Line-Level

output and National’s 3D Sound stereo enhancement.

The LM4548 supports variable sample rate conversion as

defined in the AC97 Rev2 specification. The sample rate for

the A/D and D/A can be programmed separately to convert

any rate between 4kHz - 48kHz with a resolution of 1Hz. 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

DS100987

FIGURE 1. LM4548 Block Diagram

Key Specifications

Features

n AC’97 Rev2 compliant

n National’s 3D Sound circuitry

n High quality Sample Rate Conversion (SRC) from 4kHz

n Multiple Codec Support

n True Line Level Output with volume control in addition to

n Advanced power management support

n Digital 3V and 5V compliant

Applications

n Desktop PC Audio Systems

n Portable PC Systems

n Mobile PC Systems

n Analog Mixer Dynamic Range

n D/A Dynamic Range

n A/D Dynamic Range

to 48kHz in 1Hz increments.

standard Line Out

February 1999

www.national.com

97dB (typ)

89dB (typ)

90dB (typ)

DS100987-1

Related parts for LM4548

Related keywords

LM4548 datasheet
LM4548 data sheet
LM4548 pdf datasheet
LM4548 component
LM4548 part
LM4548 distributor
LM4548 RoHS
LM4548 datasheet download