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LM4546AのメーカーはNational Semiconductorです、この部品の機能は「2 Multi-Channel Audio Codec」です。 |
部品番号 | LM4546A |
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部品説明 | 2 Multi-Channel Audio Codec | ||
メーカ | National Semiconductor | ||
ロゴ | |||
このページの下部にプレビューとLM4546Aダウンロード(pdfファイル)リンクがあります。 Total 28 pages
LM4546A
OBSOLETE
July 15, 2009
AC '97 Rev 2 Multi-Channel Audio Codec with Sample Rate
Conversion and National 3D Sound
General Description
The LM4546A 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 LM4546A provides 90 dB of Dynamic
Range.
The LM4546A 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 LM4546A supports
National's 3D Sound stereo enhancement and a comprehen-
sive 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 fea-
tures together with an extended temperature range also make
the LM4546A suitable for non-PC codec applications.
The LM4546A 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.
LM4546A 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 mul-
tiple codecs. The LM4546A may also be used in systems with
the National LM4550 to support up to 6 simultaneous chan-
nels 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.
Key Specifications
■ Analog Mixer Dynamic Range
■ DAC Dynamic Range
■ ADC Dynamic Range
97 dB (typ)
89 dB (typ)
90 dB (typ)
Features
■ AC '97 Rev 2 compliant
■ High quality Sample Rate Conversion from 4 kHz to 48
kHz in 1 Hz increments
■ Multiple codec support
■ National's 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
© 2009 National Semiconductor Corporation 200308
200308 Version 5 Revision 1 Print Date/Time: 2009/07/15 15:26:52
www.national.com
1 Page Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage
Storage Temperature
Input Voltage
ESD Susceptibility (Note 2)
pin 3
ESD Susceptibility (Note 3)
pin 3
Junction Temperature
6.0V
−65°C to +150°C
−0.3V to VDD +0.3V
2000V
750V
200V
100V
150°C
Soldering Information
LQFP Package
Vapor Phase (60 sec.)
Infrared (15 sec.)
θJA (typ) – VBH48A
Operating Ratings
Temperature Range
TMIN ≤ TA ≤ TMAX (Note 4)
Analog Supply Range
Digital Supply Range
215°C
220°C
74°C/W
−40°C ≤ TA ≤ 85°C
4.2V ≤ AVDD ≤ 5.5V
3.0V ≤ DVDD ≤ 5.5V
Electrical Characteristics (Notes 1, 5) The following specifications apply for AVDD = 5V, DVDD = 5V, Sampling
Frequency (Fs) = 48 kHz, single codec configuration, unless otherwise noted. Limits apply for TA= 25°C. The reference for 0 dB
is 1 Vrms unless otherwise specified.
Symbol
Parameter
AVDD
Analog Supply Range
DVDD
Digital Supply Range
DIDD
Digital Quiescent Power Supply
Current
AIDD
Analog Quiescent Power Supply
Current
IDSD
IASD
VREF
PSRR
Digital Shutdown Current
Analog Shutdown Current
Reference Voltage
Power Supply Rejection Ratio
Analog Loopthrough Mode (Note 8)
Dynamic Range (Note 9)
THD
Total Harmonic Distortion
Analog Input Section
VIN Line Input Voltage
VIN
VIN
Xtalk
Mic Input with 20 dB Gain
Mic Input with 0 dB Gain
Crosstalk
ZIN Input Impedance (Note 9)
CIN Input Capacitance
Interchannel Gain Mismatch
Record Gain Amplifier - ADC
AS Step Size
AM Mute Attenuation (Note 9)
Mixer Section
AS Step Size
AM Mute Attenuation
Conditions
DVDD = 5 V
DVDD = 3.3 V
LM4546A
Typical
(Note 6)
43
20
Limit
(Note 7)
4.2
5.5
3.0
5.5
Units
(Limits)
V (min)
V (max)
V (min)
V (max)
mA
mA
53 mA
500 µA
30 µA
2.23 V
40 dB
CD Input to Line Output, -60 dB Input THD
+N, A-Weighted
VO = -3 dB, f = 1 kHz, RL = 10 kΩ
97
0.01
LINE_IN, AUX, CD, VIDEO, PC_BEEP,
PHONE
CD Left to Right
All Analog Inputs
CD Left to Right
1
0.1
1
-95
40
15
0.01
90 dB (min)
0.02 % (max)
Vrms
Vrms
Vrms
dB
10 kΩ (min)
pF
dB
0 dB to 22.5 dB
1.5 dB
86 dB
+12 dB to -34.5 dB
1.5 dB
86 dB
3
200308 Version 5 Revision 1 Print Date/Time: 2009/07/15 15:26:52
www.national.com
3Pages Timing Diagrams
Clocks
Data Delay, Setup and Hold
20030810
Digital Rise and Fall
20030812
Power On Reset
Legend
20030811
20030830
www.national.com
Cold Reset
Warm Reset
20030829
20030813
20030814
6
200308 Version 5 Revision 1 Print Date/Time: 2009/07/15 15:26:52
6 Page | |||
ページ | 合計 : 28 ページ | ||
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PDF ダウンロード | [ LM4546A データシート.PDF ] |
データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
部品番号 | 部品説明 | メーカ |
LM4546 | AC 97 Rev 2 Codec with Sample Rate Conversion and National 3D Sound | National Semiconductor |
LM4546 | LM4546 AC97 Rev 2 Codec w/Samp Rate Convrsn and TI 3D Sound (Rev. D) | Texas Instruments |
LM4546A | LM4546A AC97 Multi-Chan Audio Codec w/Samp Rate Conver w/National 3D Sound (Rev. E) | Texas Instruments |
LM4546A | 2 Multi-Channel Audio Codec | National Semiconductor |