MT8972 Loop Extender Circuits Advance Information
®
MH89726/728
MT8972 Loop Extender Circuits Advance Information
Features
• • • • • • Operates from single or dual powe...
Description
®
MH89726/728
MT8972 Loop Extender Circuits Advance Information
Features
Operates from single or dual power supply MH89726 extends transmission performance for the MT8972 (DNIC) at 160kbit/s line rate MH89728 extends transmission performance for the MT8972 (DNIC) at 80kbit/s line rate MH89726 and MH89728 are pin for pin compatible with each other Compact SIL package Over 6km loop range on 24 AWG
ISSUE 2
November 1990
Ordering Information MH89726/728 10 Pin SIL Package 0°C to 70°C
Description
The MH89728 and MH89726 are thick film hybrid devices which may be used to extend the operating range of the MT8972 (DNIC). The hybrids combine signal equalization and amplification for the receive and transmit paths on each device. The small size of these hybrids makes them suitable for line card or terminal use with the MT8972. The gain of the transmit signal may be adjusted through the use of an external resistor.
Applications
Digital subscriber lines Digital PABX line cards and telephone sets High speed, limited distance modem ISDN U - Interface
TXGAIN
TXIN
PreEqualizer
TX Amplifier
TXOUT
Phase Compensator
RXOUT
PreCanceller
RX Amplifier
RXIN RXIN +
VBias
TEST
V+
V-
Figure 1 - Functional Block Diagram
9-127
MH89726/728
Advance Information
TXGAIN TXOUT RXIN + RXIN VVBias V+ TEST RXOUT TXIN
1 2 3 4 5 6 7 8 9 10
Figure 2 - Pin Connections
Pin Description
Pin # 1 Pin Name TXGAIN Description Transmit Gain. To be connected to Pin 2. An increas...
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