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LM4546B Datasheet Preview

LM4546B Datasheet

Multi-Channel Audio Codec

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LM4546B
www.ti.com
SNOSAI4F – JUNE 2005 – REVISED MAY 2013
LM4546B AC '97 Rev 2 Multi-Channel Audio Codec with Sample Rate Conversion and
Texas Instruments 3D Sound
Check for Samples: LM4546B
FEATURES
1
2 AC '97 Rev 2.1 Compliant
• High Quality Sample Rate Conversion from 4
kHz to 48 kHz in 1 Hz Increments
• Multiple Codec Support
• 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
• Automotive Telematics
KEY SPECIFICATIONS
• Analog Mixer Dynamic Range 97 dB (typ)
• DAC Dynamic Range 89 dB (typ)
• ADC Dynamic Range 90 dB (typ)
DESCRIPTION
The LM4546B is an audio codec for PC systems
which is fully PC99 compliant and performs the
analog intensive functions of the AC '97 Rev 2.1
architecture. Using 18-bit Sigma-Delta ADCs and
DACs, the LM4546B provides 90 dB of Dynamic
Range.
The LM4546B 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 2 stereo and 2 mono inputs. Each
mixer input has separate gain, attenuation and mute
control and the mixers drive 1 mono and 1 stereo
output, each with attenuation and mute control. The
LM4546B 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 application
software development. These features together with
an extended temperature range also make the
LM4546B suitable for non-PC codec applications.
The LM4546B features the ability to connect several
codecs together using the Extended AC Link
configuration of one dedicated serial data signal to
the Controller per codec. LM4546B systems support
up to 8 simultaneous channels of streaming data on
Input Frames (Codec to Controller) while Output
Frames (Controller to Codec) carry 2 streams to
multiple codecs. The LM4546B may also be used in
systems with the Texas Instruments LM4550 to
support up to 6 simultaneous channels of streaming
data on Output Frames.
The AC '97 architecture separates the analog and
digital functions of the PC audio system allowing both
for system design flexibility and increased
performance.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2005–2013, Texas Instruments Incorporated




etcTI

LM4546B Datasheet Preview

LM4546B Datasheet

Multi-Channel Audio Codec

No Preview Available !

LM4546B
SNOSAI4F – JUNE 2005 – REVISED MAY 2013
Block Diagram
www.ti.com
MIC1
MIC2
AUX
VIDEO
CD
LINE_IN
PHONE
PC_BEEP
MONO_OUT
LINE_OUT
*
GAIN: D6,0Eh
*0 dB/20 dB
MS
*R
E
6 MONO
MIX
C
O
R
D
S
E
L
E
C
T
POWER SUPPLY
and
REFERENCES
CODEC
IDENTITY
SELECT
1Ch
GAIN
MUTE
18
6' ADC
6' ADC
18
*
MIX
6
0E 10 12 14 16
M
U
GGGGG
X
AAAAA
MMMMM
*
$& ¶97
16
REGISTERS
MONO
VOLUME: 06h
Atten Mute
0A 0C
G
AA
MM
6
MIX1
D13, 20h
*
POP
18h
GAIN
ATTEN
MUTE
18
6' DAC
6' DAC
18
MASTER
+ VOLUME: 02h
Atten Mute
NATIONAL
3D SOUND
6
STEREO
MIX 3D
MIX2
ID0#
ID1#
XTAL_IN
XTAL_OUT
CIN
SDATA_IN
BIT_CLK
SYNC
SDATA_OUT
RESET#
EAPD
STEREO SIGNAL PATH
MONO SIGNAL PATH
DIGITAL SIGNAL PATH
NN
NN (HEX)
Address of Analog Input
Volume Control Register
G
A
M
GAM
Gain Attenuation Mute
(Mute is default)
* Asterisk denotes default
setting after Cold Reset
NNh
Control Register with
hexadecimal address NN
Dm, NNh
Control bit m in Register with
hexadecimal address NN
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
2
Submit Documentation Feedback
Product Folder Links: LM4546B
Copyright © 2005–2013, Texas Instruments Incorporated


Part Number LM4546B
Description Multi-Channel Audio Codec
Maker etcTI
Total Page 3 Pages
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