參數(shù)資料
型號(hào)： AK2307
廠(chǎng)商： Asahi Kasei Microsystems Co.,Ltd
元件分類(lèi)： Codec
英文描述： SPEECH CODEC for Digital Key telephone (5.0V/3.3V)
中文描述： 語(yǔ)音編解碼器的數(shù)字按鍵電話(huà)（5.0V/3.3V）
文件頁(yè)數(shù)： 12/39頁(yè)
文件大小： 468K
代理商： AK2307
ASAHI KASEI [AK2307/LV]
2-2-2 16 bit Linear PCM data mode
In this mode the 16 bit linear PCM data are interfaced to the outside. This mode is useful to compress/extend the PCM
data by much higher compress rate algorithm than u/A-law algorithm by the external DSP. The AK2307/LV CODEC
operates at 14bit accuracy, thus the least 2 bits are output as fixed value.
2-2-2-a Signals
- Frame Sync signal (FS)
8kHz reference signal which is same as in u/A-law PCM data mode. How the FS pulse H level width should be 1 clock
period which is like the short frame FS signal.
- Bit Clock (BCLK)
BCLK defines the PCM data rate. BCLK can be varied from
128kHz to 2.048MHz by 128kHz step
which is different
from in the u/A-law PCM data mode.
- PCM data output (DX)
DX is an output signal of 128Kbps linear PCM data. The data is synchronized to the BCLK which determines the data
rate. The period which the PCM data is not occupied, the DX pin turns to Hi -impedance output.
- PCM data input (DR)
DR is an input signal of
128Kbps linear PCM data
. The data is clocked by BCLK at the falling edge and fed into the
D/A
block.
16bti Linear Frame format
MS0190-E-05
2005/12
12
12
13
14
*
12
13
14
*
125us (8KHz)
FS
DR
DX
BCLK
1
2
3
Hi-Z
Hi-Z
1
2
3
*
*
Hi-Z
1
*
1
MSB First
MSB First
2-2-3 AK130 B1/B2 Mode
These modes are for connecting the PCM interface to AK130, AKM’s TCM( ping-pong ) transceiver for PBX/KTS
system.
The PCM data format is A-law or u-law which can be selected by the register. The AK130 B1 mode interfaces the data
to B1 channel which is one of two B channels which AK130 provides, and the AK130 B2 mode interfaces to B2 chann el.
2-2-3-a Signals
- Frame Sync signal (FS) ___
Please feed the FS signal which is generated by AK130.( F0o , pin#3 )
- Bit Clock (BCLK)
BCLK defines the PCM data rate. Please use 2.048MHz clock which is generated by AK130 .( E2o,pin#5 )
- PCM data output (DX)
DX is an output signal of 128Kbps linear PCM data. Please connect to the PCM data input pin of AK130.( DSTi,pin#11 )
- PCM data input (DR)
DR is an input signal of
128Kbps linear PCM data
. The data is clocked by BCLK at the falling edge and fed into the
D/A
block. Please connect to the PCM data output pin of AK130.( DSTo,pin#6 )
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