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(R)
MH89101
Passive Line Termination Circuit Advance Information
Features
* * * Passive Line Termination (PLT) for MT8910 DSLIC High precision trimmed resistors Excellent resistor matching required to meet longitudinal balance as specified in ANSIT1.601 Compact SIL package
ISSUE 1
August 1991
Ordering Information MH89101 6 Pin SIL Package 0C to +70C
Description
The MH89101 is a thick film hybrid device which is used in conjunction with the MT8910 to perform two to four wire conversion and analog signal conditioning on the received 2B1Q signal.
*
Applications
* * * * Pair gain system ISDN NT1 and NT2 interfaces Digital multiplexers and concentrators ISDN U-interface terminals
The signal conditioning is necessary to enable the DSLIC to interface to the Digital Subscriber Line as defined in ANSI T1.601-1988. The precanceller block will perform two to four wire conversion and provide adequate isolation between transmit and receive paths. The small size and the precise resistor matching on the hybrid makes it suitable for line card or terminals which use the MT8910 2B1Q U-Interface Transceiver.
TXin +
XFM + RXout Compensator Circuit Precanceller
RXout + XFM -
TXin -
Figure 1 - Functional Block Diagram
9-29
MH89101
Advance Information
TXin + XFM + RXout + RXout XFM TXin -
1 2 3 4 5 6
(component side)
Figure 2 - Pin Connections
Pin Description
Pin # 1 2 3 4 5 6 Name TXin+ XFM+ RXout+ RXoutXFMTXinDescription Transmit Line Signal Input. Must be connected to the Lout+ output of the DSLIC. Transformer. Node of the 2 to 4 wire converter which must be connected to the primary of the line transformer. Receive Line Signal Output. Output of the compensator circuit which must be connected to the Lin+ input of the DSLIC. Receive Line Signal Output. Output of the compensator circuit which must be connected to the Lin- input of the DSLIC. Transformer. Node of the 2 to 4 wire converter which must be connected to the primary of the line transformer. Transmit Line Signal Input. Must be connected to the Lout- output of the DSLIC.
9-30
Advance Information
Functional Description
The termination network is an all passive circuit which allows the DSLIC to interface to the DSL through a pulse transformer. The equivalent circuit of the Passive Line Termination Network can be seen in Figure 3 below. The PLT consists of two blocks which includes a hybrid network and a compensator circuit. The hybrid network is a 2 to 4 wire converter which provides a large degree of precancellation of the near end signal while presenting little attenuation to the far end signal. This is performed using a summing junction which effectively subtracts the transmit signal from the receive path. The compensator circuit, in conjunction with the transformer, acts as a highpass filter reducing the low frequency content in the received line signal. This, in turn, decreases the effects of ISI and near end echo, and improves the transceiver performance.
MH89101
Typical Application
Figure 4 shows a typical connection diagram of the MT8910 DSLIC and the Passive Line Termination Circuit. As seen in Figure 4, the PLT is positioned between the DSLIC and the line pulse transformer. Two series protection resistors on the secondary of the line pulse transformer are used to dissipate any extraneous energy which may be induced onto the transmission line.
TXIN + 680 pF 3.3 nF
Rs = 30.2 Rb1 1K6 Rb2 1K
130 K RXOUT + 68K2 RXOUT 130 K
20 K
XFM +
7K8
20 K XFM -
680 pF TXIN -
3.3 nF
Rb1 1K6 Rs = 30.2
Rb2 1K
Figure 3 - Passive Line Termination Network
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MH89101
Advance Information
1:1.3 MT8910 Lout + Lin + Lin Lout MH89101 TXin + XFM + RXout + RXout XFM TXin D3 D1 + 5V D2 7mH D4
10 10% 5.5 mH 1.5 F 5.5 mH Power Feed/Extract 10 10%
Note: D1-D4 Schottky Diodes MUR 105
Figure 4 - Typical Connection Diagram
15.24 mm 0.51 mm (0.6" 0.020")
10.67 mm 0.51 mm (0.42" 0.020")
1 1.45 mm max. (0.058") 4.45 mm 0.39 mm (0.175" 0.015")
2.54 mm 0.254 mm (0.1" 0.010") NOTE: All dimensions mm (inches)
0.5 mm nominal (0.020")
Figure 5 - Physical Dimensions
9-32
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