MH89761

® MH89761 T1 Transmit Equalizer Advance Information Features Compatible with the MH89760B Transmit equalizer and 6dB loop around circuit 6dB pad for easier loopback testing Programmable for varying degrees of equalization TL TL TI Ri RL RL TxT EIT EA L1 EB EC L2 RCHT RCLT TxR EIR SW RCHR RCLR ISSUE 4 May 1995 Pin Connections 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Description The MH89761 is a programmable transmit equalizer for use with a T1 line interface, specifically the MH89760B. The MH89761 contains a three setting transmit equalizer, and a 6 dB pad for external loop around. The input and output impedance of the circuit is 100 Ω. The device is fabricated in thick film hybrid technology and is 2 inches high by 0.5 inches wide. The MH89761 is designed to drive 22 gauge twisted pair from the multiplex equipment to the crossconnect point. Figure 1 shows how the MH89761 is connected to the transmit side of a T1 interface. Ordering Information -40°C to 85°C MH89761 20 Pin SIP Hybrid MH89760B TR1 OUTA +12V L2 C2 1: OUTB MH89761 1: :0.5 R1 L1 C1 S1 S2 EIT EIR TxT TxR EA EB EC SW RCLT RCHT RCLR RCHR Ti Ri TL RL S3 S4 S5 S6 S7 R1 = 150Ω C1 = .01µF C2 = .47µF L1 = 33µH L2 = 33µH TR2 RxT 1: 1: 1: RxR Figure 1 - Connection Diagram 4-93 MH89761 Applications The MH89761 can be connected to the MH89760B as illustrated in Figure 1. All pins on the MH89761 not shown connected in Figure 1 should be left open. The internal circ...