MH88524

MH88524 ® Dual 2-4 Wire Circuit Preliminary Information Features Full duplex operation Two complete circuits per package Transformerless 2-4 Wire (4-2 Wire) conversion + 5V operation Wide bandwidth (50kHz) Small Package Size MH88524 ISSUE 4 April 1995 Ordering Information 10 Pin SIL Package 0° C to 70° C Description The Mitel MH88524 (Dual 2-4 wire Circuit) provides two independent interfaces between4-Wire devices such as the MH88631 COIC (Central Office Interface CIrcuit) and a speech switch such as the MT8814 (Analog Switch Array), requiring only a single bidirectional switch per crosspoint. The MH88524 can accommodate two full duplex audio links. The device is fabricated as a thick film hybrid which incorporates various technologies for optimum circuit design and very high reliability. Applications 4-2 Wire and 2-4 Wire conversion for: MH88630/631, MH88632, MH88500 & MT8840 PBX Key Telephone System Channel bank Voice Mail Terminal Equipment Digital Loop Carrier Modem Intercom RX1 Receive Gain Circuit1 2-4 Wire Circuit 1 JUN1 TX1 Transmit Gain Circuit 1 RX2 Receive Gain Circuit 2 2-4 Wire Circuit 2 JUN2 TX2 Transmit Gain Circuit 2 VDD VEE AGND Figure 1 - Functional Block Diagram 2-73 MH88524 Preliminary Information RX1 JUN1 TX1 VDD AGND VEE IC TX2 JUN2 RX2 1 2 3 4 5 6 7 8 9 10 Figure 2 - Pin Connections Pin Description Pin # 1 2 3 4 5 6 7 8 9 10 Name RX1 JUN1 TX1 VDD AGND VEE IC TX2 JUN2 RX2 Description Receive 1 (Inp...