MH88632B Datasheet, PDF (1/17 Pages) Mitel Networks Corporation – Central Office Interface Circuit Preliminary Information

MH88632B
®
Central Office Interface Circuit
Preliminary Information
Features
• Supports Loop Start and Ground Start protocols
• 2-4 Wire conversion
• Programmable Input Impedance, Network
Balance Impedance and gains
• Three relay drivers
• Line state detection outputs
• 15mA operation allowing long line length
capability
• On-hook reception for Caller Line Identification
• Meets FCC Part 68 Leakage Current
Requirements
Applications
Interface to Central Office telephone line for
• PBX
• Key Telephone System
• Terminal Equipment
• Digital Loop Carrier
• Wireless Local Loop
ISSUE 3
September 1997
Ordering Information
MH88632B 40 Pin SIL Package
MH88632BT 40 Pin 90˚ Package
0°C to 70°C
Description
The Mitel MH88632B Central Office Interface Circuit
provides a complete analog and signalling link
between audio switching equipment and a subscriber
line. The device is available in a single in line
package for high packing densities or in a 90˚
package for reduced card clearance.
The device is fabricated using thick film hybrid
technology for optimum circuit design and very high
reliability.
RV FL RL RG TG
VCC VEE AGND
GRD GRC BRD BRC LRD LRC
RING
TIP
Status
Detection
Relay Driver Circuit
Dummy
Ringer
Line
Termination
2-4 Wire
Hybrid
Impedance
Matching
Network
Balance
Receive
Gain
Transmit
Gain
XLA XLB XLC XLD
Z1 Z2 Z600 Z900 NS N1 N2 NATT
Figure 1 - Functional Block Diagram
VRLY
RGND
RX
GRX1
GRX0
TX
GTX1
GTX0
2-239