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MAS3549F 参数 Datasheet PDF下载

MAS3549F图片预览
型号: MAS3549F
PDF下载: 下载PDF文件 查看货源
内容描述: MAS 35x9F MPEG 2/3层, AAC音频解码器, G.729附录编解码器 [MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec]
分类和应用: 解码器编解码器
文件页数/大小: 92 页 / 1187 K
品牌: MICRONAS [ MICRONAS ]
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DATA SHEET  
MAS 35x9F  
4.6.2.5. S/PDIF Output Characteristics  
at T = T , V  
, V  
= 2.2 ... 3.6 V, f  
= 18.432 MHz, Typ. values for T = 25 °C in P(L/M)QFP package.  
CRYSTAL A  
A
SUPD SUPA  
Limit Values  
Symbol  
Parameter  
Pin Name  
Unit  
Test Conditions  
Min.  
Typ.  
Max.  
fs1  
fs2  
fs3  
tP  
Bi-phase frequency  
Bi-phase frequency  
Bi-phase frequency  
Bi-phase period  
SPDO  
SPDO  
SPDO  
SPDO  
3.072  
2.822  
2.048  
326  
MHz  
MHz  
MHz  
ns  
fs = 48 kHz  
fs = 44.1 kHz  
fs = 32 kHz  
at fs = 48 kHz, (highest  
sampling rate)  
tR  
tF  
Rise time  
Fall time  
SPDO  
SPDO  
SPDO  
SPDO  
0
0
2
2
ns  
ns  
%
Cload = 10 pF  
Cload = 10 pF  
Duty cycle  
50  
tH1,L1  
tH0,L0  
VS  
163  
ns  
minimum/maximum pulse  
duration with a level  
above 90% or below 10%  
and at fs = 48 kHz  
SPDO  
SPDO  
326  
ns  
minimum/maximum pulse  
duration with a level  
above 90% or below 10%  
and at fs = 48 kHz  
Signal amplitude  
VSUPD  
t
t
R
F
t
t
H1  
L1  
Bit value = 1  
Bit value = 0  
t
t
L0  
H0  
t
P
Fig. 4–27: Timing of the S/PDIF output  
4.6.2.6. PIO as Parallel Input Interface: DMA Mode  
the controller. Please refer to Figure for the exact tim-  
ing.  
In decoding mode, the data transfer can be started  
after the EOD pin of the MAS 35x9F is set to “high”.  
After verifying this, the controller signalizes the send-  
ing of data by activating the PR line. The MAS 35x9F  
responds by setting the RTR line to the “low” level. The  
MAS 35x9F reads the data PI[19:12] and sets RTR to  
low after rising edge of PR. After RTR is set to high,  
the mC sets PR to low. The next data word write oper-  
ation will be initialized again by setting the PR line via  
The procedure above will be repeated until the  
MAS 35x9F sets the EOD signal to “0” which indicates  
that the transfer of one data block has been executed.  
Subsequently, the controller should set PR to “0”, wait  
until EOD rises again and then repeat the procedure to  
send the next block of data. The DMA buffer for MPEG  
decoding is 30 bytes long. The size for G.729 is 10  
bytes.  
Micronas  
June 30, 2004; 6251-505-1DS  
77  
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