Name
TXL2-0
MT9074
Data Sheet
Functional Description
Transmit Line Build Out 2 - 0. Setting these bits shapes the transmit pulse as detailed in
the table below:
TXL2
TXL1
TXL0
Line Build Out
0
0
0
0 to 133 feet/ 0 dB
0
0
1
133 to 266 feet
0
1
0
266 to 399 feet
0
1
1
399 to 533 feet
1
0
0
533 to 655 feet
1
0
1
-7.5 dB
1
1
0
-15 dB
1
1
1
-22.5 dB
After reset these bits are zero.
Table 1 - Transmit Line Build Out (T1)
TTIP
0.47 uF RT
TRING
RTIP
RRING
RT
+5 V
100 Ω
1:2
Fuse
Tx
**
1:1
*
Fuse
Fuse
RT: 2.4 Ω
Fuse
* Recommended Rectifier bridge
diodes are MUR460 (due to low
capacitance).
** Recommended Zero-Diode is
1N5339 (due to high capacitance)
Rx
Figure 5 - Analog Line Interface (T1)
19
Zarlink Semiconductor Inc.