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AFE1124E 参数 Datasheet PDF下载

AFE1124E图片预览
型号: AFE1124E
PDF下载: 下载PDF文件 查看货源
内容描述: HDSL / MDSL模拟前端 [HDSL/MDSL ANALOG FRONT END]
分类和应用:
文件页数/大小: 11 页 / 162 K
品牌: BB [ BURR-BROWN CORPORATION ]
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received in the first 16 bits of each baud period. The  
remaining 32-bit periods are not used for Data In. Data Out  
is transmitted during the first 16 bits of the baud period. A  
second interpolated value is transmitted in subsequent bits of  
the baud period.  
be valid on the rising edge of the tx48xCLK. The AFE1124  
reads Data In on the rising edge of the tx48xCLK. The bits  
are defined in Table I. Data In is read by the AFE1124  
during the first 16 bits periods of each baud period. Only the  
first 8 bits are used in the AFE1124. The second 8 bits are  
reserved for use in the future products. The remaining 32  
bits periods of the baud period are not used for Data In.  
txbaudCLK: The transmit data baud rate, generated by the  
DSP. It is 392kHz for T1 or 584kHz for E1. It may vary from  
32kHz (64kbps) to 584kHz (1.168Mbps).  
Data In Bits:  
tx48xCLK: The transmit pulse former oversampling sam-  
pling clock, generated by the DSP. It is 48x the transmit  
symbol rate or 28.032MHz for 584kHz symbol rate. This  
clock should run continuously.  
tx enable signal—This bit controls the tx Symbol definition  
bits. If this bit is 0, only a 0 symbol is transmitted regardless  
of the state of the tx Symbol definition bits. If this bit is 1,  
the tx Symbol definition bits determine the output symbol.  
Data In: This is a 16-bit output data word sent from the DSP  
to the AFE. The sixteen bits include tx symbol information  
and other control bits, as described below. The data should  
be clocked out of the DSP on the falling edge and it should  
tx Symbol Definition—These two bits determine the output  
2B1Q symbol transmitted.  
Rx Gain Settings—These bits set the gain of the receive  
channel programmable gain amplifier.  
MSB  
LSB  
1
2
3
1
1
8
Reserved  
tx Boost  
Loopback  
rx Gain  
tx Symbol  
tx Enable  
FIGURE 3. Data In Word.  
4ns  
4ns  
rxbaudCLK  
A
B
from DSP  
4ns  
4ns  
14  
rx48xCLK  
from DSP  
48  
1
15  
16  
17  
23  
24  
25  
26  
39  
40  
47  
48  
1
Data Out  
from AFE1124  
MSB  
Bit 15  
LSB  
Bit 0  
MSB  
Bit 15  
LSB  
Bit 0  
MSB  
Bit 15  
trx1  
Data 1  
Interdata 8 Bits  
Interdata 8 Bits  
Data 1a  
Data 2  
Receive Timing Notes: (1) A baud period consists of 48 periods of the tx48xCLK. (2) The falling edge of the rxbaudCLK  
can occur anywhere in area A. The rising edge can occur anywhere in area B. However, neither edge of the  
rxbaudCLK can occur within 4ns (on either side) of any rising edge of rx48xCLK. (3) For all data bits after the MSB of  
Data 1, the AFE1124 transfers Data Out on the falling edge of the rx48xCLK. The time from the falling edge of  
rx48xCLK until Data Out is stable is trx1  
.
MIN  
9ns  
MAX  
14ns  
trx1  
(4) The AFE1124 transfers the MSB of Data 1 on the falling edge of rxbaudCLK. If the falling edge of rxbaudCLK is  
synchronized with the falling edge of rx48xCLK, all of the Data Out bits will be the same width. In any case, the time  
from the falling edge of rxbaud CLK until the MSB of Data 1 is stable is trx1  
.
FIGURE 4. Receive Timing Diagram.  
®
7
AFE1124