欢迎访问ic37.com |
会员登录 免费注册
发布采购

BT8375EPF 参数 Datasheet PDF下载

BT8375EPF图片预览
型号: BT8375EPF
PDF下载: 下载PDF文件 查看货源
内容描述: 单芯片收发器T1 / E1和综合业务数字网( ISDN )基本速率接口 [single chip transceivers for T1/E1 and Integrated Service Digital Network (ISDN) primary rate interfaces]
分类和应用: 电信集成电路综合业务数字网
文件页数/大小: 323 页 / 1950 K
品牌: CONEXANT [ CONEXANT SYSTEMS, INC ]
 浏览型号BT8375EPF的Datasheet PDF文件第198页浏览型号BT8375EPF的Datasheet PDF文件第199页浏览型号BT8375EPF的Datasheet PDF文件第200页浏览型号BT8375EPF的Datasheet PDF文件第201页浏览型号BT8375EPF的Datasheet PDF文件第203页浏览型号BT8375EPF的Datasheet PDF文件第204页浏览型号BT8375EPF的Datasheet PDF文件第205页浏览型号BT8375EPF的Datasheet PDF文件第206页  
Bt8370/8375/8376  
3.14 Clock Rate Adapter Registers  
LFGAIN[3:0]  
Fully Integrated T1/E1 Framer and Line Interface  
Loop Filter GainDetermines CLAD jitter tolerance and jitter attenuation characteristics by  
selecting the NCO loop filter's proportional phase error gain. Lower gain values improve jitter  
tolerance by reducing phase response time, but provide less jitter attenuation. Higher gain  
values increase the phase response time and improve jitter attenuation at the expense of loop  
acquisition time.  
NOTE:  
Loop instability or acquisition failures may result from incorrectly programmed  
LFGAIN values. Typically, LFGAIN is programmed to provide a minimum 3 Hz loop  
bandwidth and 20 dB/decade jitter attenuation with 6 Hz filter cutoff frequency.  
LFGAIN values of 5 or 6 are typically chosen to meet jitter requirements.  
LFGAIN  
0000  
Proportional Gain  
0
1/2  
|
|
15  
1111  
1/2  
091CLAD Frequency Select (CSEL)  
7
6
5
4
3
2
1
0
VSEL[3]  
VSEL[2]  
VSEL[1]  
VSEL[0]  
OSEL[3]  
OSEL[2]  
OSEL[1]  
OSEL[0]  
VSEL[3:0]  
CLADV Frequency SelectApplicable only if CEN [addr 90] is active. Picks one of eight  
CLAD divider chain frequencies to feed back to the CPHASE detector. (Refer to Tables 2-8  
through 2-9 for programming examples.) The selected CLADV frequency passes to VSCALE  
for further division before phase detector comparison.  
VSEL  
0000  
0001  
0010  
0011  
0100  
0101  
0110  
0111  
CLADV Frequency (kHz)  
1024  
2048  
4096  
8192  
2560  
1544  
1536  
XSEL  
T1/E1 line rate x 2  
16,384  
(addr 090)  
1xxx  
3-84  
Conexant  
N8370DSE