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PDF AK4545 Data sheet ( Hoja de datos )
| Número de pieza | AK4545 | |
| Descripción | AC97 AUDIO CODEC | |
| Fabricantes | Asahi Kasei Microsystems | |
| Logotipo |  |
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[ASAHI KASEI]
[AK4545]
AK4545
AC’ 97™ Audio CODEC with SRC and DIT
Features
• AC’ 97 Rev. 2.1 Compliant
• S/PDIF output
• 18bit Resolution A/D and D/A
• Exceeds PC99 Performance Requirements:
AK4545 (@fs=48k)
A/D………………90dBA
D/A………………89dBA
A-A………………95dBA
• Analog Inputs:
4 Stereo Inputs: LINE, CD, VIDEO, AUX
Speakerphone and PC BEEP Inputs
2 Independent MIC Inputs
• Variable Sampling Rate Support
48k, 44.1k, 32k, 22.05k, 16k, 11.025k, 8k
• Analog Output:
Stereo LINE Output with volume control
True Line Level with volume control
Mono Output with volume control
• 3D Stereo Enhancement
• POP Function & DAC Feed Back Control
• EAPD(External Amplifier Powerdown) Support
• Power Supplies: Analog 5.0V, Digital 3.3V
• Low Power Consumption
215mW(Analog:5V/Digital:3.3V) at full operation
• 48 Pin LQFP Package
General Description
The AK4545 is a 18bit high performance codec which supports
variable sampling rate conversion compliant with Audio Codec ’ 97
Rev 2.1 requirements.
The AK4545 supports S/PDIF output that is digital audio transmitter
of IEC958. Audio digital data in PC can be output by this S/PDIF out.
The AK4545 provides two pairs of stereo outputs with independent
volume controls, a mono output, and multiple stereo and mono inputs,
along with flexible mixing, gain and mute functions to provide a
complete integrated audio solution for PCs. In addition, the AK4545
has the POP feature suitable for 3D positioning and direct output from
DAC for AD monitoring.
Sampling frequency is programmable through AC-link as 48k, 44.1k,
32k, 22.05k, 16k, 11.025k, and 8kHz. This setting is done independent
to ADC and DAC side while L/R channels are kept identical.
The AK4545 provides excellent audio performance, meeting or
exceeding PC99 requirements for a PCI audio solution. It has low
power consumption, and flexible power-down modes for use in laptops
as well as desktop PCs and aftermarket add-in boards.
Like the earlier pin-compatible AK4541, AK4543 and AK4544A , the
AK4545 is available in a compact 48-lead LQFP package.
Reference : Audio Codec ’ 97 Revision 2.1
nBlock Diagram
EAPD
SYNC
SDATA_OUT
SDATA_IN
BIT_CLK
RESET#
TX
Digital Section
Power Management
PLL
AC
Link
Interface
ADC
AC’97
Registers
and
Control
Logic
Control Singals
Dataslot
Controller
DAC
Analog Section
Input
Multiplexer
Volume
and
Mute
Control
Output
Mixer
Volume
and
Mute
Control
S/PCDlIoFcOkut
Clock
GCeonnetraotlor Generator
Voltage
Reference
3D Stereo Enhancement
* AKM assumes no responsibility for the usage beyond the conditions in this data sheet.
LINE_IN
CD
AUX
VIDEO
MIC1
MIC2
Phone
PC_BEEP
LINE_OUT
TRUE_LINE_LEVEL
MONO_OUT
MS0058-E-00
-1-
2000/11
1 page  
[ASAHI KASEI]
[AK4545]
AK4545 Analog Characteristics
Ta=25°C,AVdd=5.0V,DVdd=3.3V, fs=48kHz unless otherwise specified, Signal Frequency =1kHz
All volume setting for ADC/DAC performance measurement is 0dB.
Parameter
min typ max
Audio-ADC
Resolution
18
S/N (A weight, fs=48kHz)
83 90
S/N (A weight, fs=44.1kHz)
87
S/(N+D)
(fs=48KHz, -1dB analog input)
70 82
Inter Channel Isolation
70 77
Inter Channel Gain Mismatch
0.5
Full Scale Input Voltage
0.88 1.0 1.12
Power Supply Rejection
50
Audio DAC: measured at AOUTL/AOUTR via MIXER path
Resolution
18
S/N (A weighted, fs=48kHz)
: mixer+DAC measured at AOUT
84 89
S/N (A weighted, fs=44.1kHz)
: mixer+DAC measured at AOUT
88
S/(N+D)
(fs=48KHz, -1dB digital input)
72 80
Inter Channel Isolation
70 80
Inter Channel Gain Mismatch
1.0
Full Scale Output Voltage
0.88 1.0 1.12
Total Out-of-Band Noise (28.8kHz - 100kHz)
-70
Power Supply Rejection
50
MIC Amplifier / MUX
Gain : 20dB is selected
18 20 22
Master volume (Mono, Stereo, True Line Level Out) : 1.5dB x 32 step
Step Size
-1.5
Attenuation Control Range
-46.5
0
Load Resistance
10
PC Beep : 3dB x 16 step
Step Size
-3.0
Attenuation Control Range
-45 0
Analog Mixer : 1.5dB x 32 step
Step Size
-1.5
Gain Control Range
-34.5
+12
Record Gain : 1.5dB x 16 step
Step Size
+1.5
Gain Control Range
0 +22.5
Mixer
Input Voltage (except for MIC)
1.0
Input Voltage MIC : Gain = 0dB
1
MIC : Gain = 20dB
0.1
S/N(A weighed) : 0dB setting, 1 path is selected at Mixer
CD to AOUT:
88 95
Other analog input to AOUT
95
Input Impedance (Input gain=0dB,Rec_MUTE=off)
PC_BEEP only
(10) 76
Others(PHONE, LINE, CD, AUX, VIDEO)
(10) 40
Input Impedance (MIC1 and MIC2)
(10) 20
Output load Resistance
10
(LINE_OUT_L/R, MONO_OUT, LNLVL_OUT_L/R)
Vrefout
Drivability
1.25
Units
Bits
dB
dB
dBFS
dB
dB
Vrms
dB
Bits
dB
dB
dBFS
dB
dB
Vrms
dB
dB
dB
dB
dB
kΩ
dB
dB
dB
dB
dB
dB
Vrms
Vrms
Vrms
dB
dB
kΩ
kΩ
kΩ
kΩ
mA
MS0058-E-00
-5-
2000/11
5 Page 
[ASAHI KASEI]
[AK4545]
General Description
nAC 97 Connection to the Digital AC 97 controller
2AC ‘97 communicates with its companion AC ‘97 controller via a digital serial link, AC-link”. All digital audio streams, and
command/status information are communicated over this point to point serial interconnect. A breakout of the signals connecting the
two is shown in the following figure.
AC97
Controller
AC97
SYNC
BIT_CLK
SDATA_OUT
SDATA_IN
RESET#
nDigital Interface
The AK4545 incorporates a 5 pin digital serial interface that links it to the AC ’97 controller. AC-link is a bi-directional, fixed
rate(48kHz), serial PCM digital stream. It handles multiple input, and output audio streams, as well as control register accesses
employing a time division multiplexed (TDM) scheme. The AC-link architecture divides each audio frame into 12 outgoing and 12
incoming data streams, each with 20-bit sample resolution. DAC and ADC resolution of the AK4545 is 18 bit resolution. The data
streams currently defined by the AC ‘97 specification include:
l PCM Playback
2 output slots
2 channel composite PCM output stream
l PCM Record data
2 input slots
2 channel composite PCM input stream
l Control
2 output slots
Control register write port
l Status
2 input slots
Control register read port
l S/PDIF output data
2 output slots
2 channel composite data output stream
SYNC, fixed at 48 KHz, is derived by dividing down the serial bit clock (BIT_CLK). BIT_CLK, fixed at 12.288 MHz, provides the
necessary clocking granularity to support 12, 20-bit outgoing and incoming time slots. AC-link serial data is transitioned on each
rising edge of BIT_CLK. The receiver of AC-link data, the AK4545 for outgoing data and AC ’97 controller for incoming data,
samples each serial bit on the falling edges of BIT_CLK.The AK4545 outputs BIT_CLK.
The AC-link protocol provides for a special 16-bit slot (Slot 0) wherein each bit conveys a valid tag for its corresponding time slot
within the current audio frame. A “1” in a given bit position of slot 0 indicates that the corresponding time slot within the current audio
frame has been assigned to a data stream, and contains valid data. If a slot is “Tagged” invalid, it is the responsibility of the source
of the data, (The AK4545 for the input stream, AC ’97 controller for the output stream), to stuff all bit positions with 0’s during that
slot’s active time.
SYNC remains high for a total duration of 16 BIT_CLKs at the beginning of each audio frame. The portion of the audio frame where
SYNC is high is defined as the “Tag Phase”. The remainder of the audio frame where SYNC is low is defined as the “Data Phase”.
Note that SDATA_OUT and SDATA_IN data is delayed one BIT_CLK becauseAC97 controller causes SYNC
signal high at a rising edge of BIT_CLK which initiates a frame.
Output stream means the direction from AC 97 controller to the AK4545 , and Input stream means the direction
from the AK4545 to AC97 controller
2All the following sentences written with small italic font in this document quote the AC’ 97 component specification.
MS0058-E-00
- 11 -
2000/11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AK4545.PDF ] | |
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