MH89726 Datasheet, PDF (1/6 Pages) Mitel Networks Corporation – MT8972 Loop Extender Circuits Advance Information

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
Applications
• Digital subscriber lines
• Digital PABX line cards and telephone sets
• High speed, limited distance modem
• ISDN U - Interface
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.
TX_IN
TX_GAIN
Pre-
Equalizer
TX
Amplifier
Phase
Compensator
RX_OUT
V_Bias
Pre-
Canceller
RX
Amplifier
TEST
V+ V-
Figure 1 - Functional Block Diagram
TX_OUT
RX_IN -
RX_IN +
9-127