参数资料
型号: LXT331QH
英文描述: LINE INTERFACE|CMOS|QFP|44PIN|PLASTIC
中文描述: 线路接口|的CMOS | QFP封装| 44PIN |塑料
文件页数: 22/32页
文件大小: 395K
代理商: LXT331QH
LXT331
Dual T1/E1 Line Interface Unit
22
Datasheet
3.2.3
2.048 Mbps E1 Twisted-Pair Applications
Figure 13
shows a typical 2.048 Mbps E1 twisted-pair (120
) application. The line length
equalizers are controlled by the hardwired LEN inputs. With the LEN code set to 001 and 15
Rt
resistors in line with the 1:2 output transformers, the LXT331 produces the 3.0 V peak pulses
required for twisted-pair applications.
Figure 11. Line Interface for E1 Coax
LXT331
TTIP
n
TRING
n
RTIP
n
RRING
n
1:2
1:1
Rt
Rt
470pF
75
1k
1k
1
Vcc
D2
D1
Vcc
D4
D3
2
Typical value, adjust for board parasitics to obtain
optimum return loss.
1
D1, D2, D3 & D4 are protection diodes (Schottky)
International Rectifier: 11DQ04 or 10BQ060;
Motorola: MBR0540T1.
2
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