AC97 Codec. LM4546 Datasheet

LM4546 Codec. Datasheet pdf. Equivalent

Part LM4546
Description AC97 Codec
Feature LM4546 AC ’97 Rev 2 Codec with Sample Rate Conversion and National 3D Sound February 1999 LM4546 A.
Manufacture National Semiconductor
Datasheet
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LM4546
February 1999
LM4546
AC ’97 Rev 2 Codec with Sample Rate Conversion and
National 3D Sound
General Description
The LM4546 is an audio codec for PC systems which is fully
PC98 compliant and performs the analog intensive functions
of the AC97 Rev 2 architecture. Using 18-bit Sigma-Delta
A/D’s and D/A’s, the LM4546 provides 90dB of Dynamic
Range.
The LM4546 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.
The LM4546 also provides National’s 3D Sound stereo en-
hancement.
The LM4546 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.
Key Specifications
n Analog Mixer Dynamic Range
n D/A Dynamic Range
n A/D Dynamic Range
97dB (typ)
89dB (typ)
90dB (typ)
Features
n AC’97 Rev 2 compliant
n National’s 3D Sound circuitry
n High quality Sample Rate Conversion (SRC) from 4kHz
to 48kHz in 1Hz increments
n Multiple Codec support
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
Block Diagram
FIGURE 1. LM4546 Block Diagram
© 1999 National Semiconductor Corporation DS100985
DS100985-1
www.national.com



LM4546
Absolute Maximum Ratings (Note 3)
Soldering Information
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 5)
6.0V
−40˚C to +150˚C
−0.3V to VDD +0.3V
2500V
TQFP Package
Vapor Phase (60 sec.)
215˚C
Infrared (15 sec.)
220˚C
See AN-450 Surface Mounting and their Effects on
Product Reliabilityfor other methods of
soldering surface mount devices.
θJA (typ) — VBH48A
74˚C/W
pins 27, 28
pin 3
ESD Susceptibility (Note 6)
pin 3
Junction Temperature
1500V
750V
200V
100V
150˚C
Operating Ratings
Temperature Range
TMIN TA TMAX
Analog Supply Range
Digital Supply Range
−40˚C TA 85˚C
4.2V AVDD 5.5V
3.0V DVDD 5.5V
Electrical Characteristics (Notes 1, 3)
The following specifications apply for AVDD = 5V, DVDD = 5V, Fs = 48kHz, single codec configuration, unless otherwise noted.
Limits apply for TA= 25˚C. The reference for 0dB is 1Vrms unless otherwise specified.
Symbol
Parameter
Conditions
LM4546
Units
(Limits)
Typical Limit
(Note 7) (Note 8)
AVDD
Analog Supply Range
4.2 V (min)
5.5 V (max)
DVDD
Digital Supply Range
3.0 V (min)
5.5 V (max)
DIDD
Digital Quiescent Power Supply
Current
DVDD = 5V
43 mA
AIDD
Analog Quiescent Power Supply
Current
DVDD = 3.3V
20 mA
53 mA
IDSD
IASD
VREF
PSRR
Digital Shutdown Current
Analog Shutdown Current
Reference Voltage
Power Supply Rejection Ratio
500
30
2.23
40
µA
µA
V
dB
Analog Loopthru Mode
Dynamic Range (Note 2)
THD
Total Harmonic Distortion
Analog Input Section
CD Input to Line Output, -60dB Input
THD+N, A-Weighted
VO = -3dB, f = 1kHz, RL = 10k
97
0.01
90 dB (min)
0.02 % (max)
VIN Line Input Voltage
Mic Input with 20dB Gain
1 Vrms
0.1 Vrms
Mic Input with 0dB Gain
1 Vrms
Xtalk
ZIN
CIN
Crosstalk
Input Impedance(Note 2)
Input Capacitance
Interchannel Gain Mismatch
CD Left to Right
CD Left to Right
-95 dB
40 10 k(min)
15 pF
0.01
dB
Record Gain Amplifier - A/D
AS Step Size
Mixer Section
0dB to 22.5dB
1.5 dB
AS Step Size
AM Mute Attenuation
Analog to Digital Converters
+12dB to -34.5dB
1.5 dB
86 dB
Resolution
18 Bits
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