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| (R) MH89793 E1 Transceiver with Selectable Impedance Preliminary Information Features * * * * * * * * Complete primary rate 2048kb/s CEPT line driver and receiver Onboard pulse transformers for transmit and receive Meets latest ETSI requirements [ETSI ETS 300 011 (NET 5)] Inductorless clock recovery Loss of signal (LOS) indication Single +5V operation Compatible with MT9079 Framer Selectable termination impedance ISSUE 1 April 1995 Ordering Information MH89793 28 Pin DIL Package Surface Mount Option is available by adding the suffix "S" 0C to +70C Description The Mitel MH89793 is a low cost E1 line driver/receiver with clock extraction requiring no external components. The device is suitable for both 120R and 75R applications, by linking external pins. By combining the MH89793 with Mitel's E1 framer, the MT9079, a cost effective and efficient interface to E1 lines can be built. Applications * * * * Primary rate ISDN network Interface Multiplexer equipment Private Network links Isochronous LANS/WANS VDD VSS TZA1 TZA2 TZA3 TZB1 TZB2 TZC1 TZC2 TZD1 TZD2 TxA TxB Line Driver Transmit Isolation Transformer 6dB Pad TLA TLB E2o LOS Clock Recovery Receive Isolation Transformer RLA RLB RxA RxB Line Receiver EQUIPMENT SIDE LINE SIDE RZA RZB Figure 1 - Functional Block Diagram 4-229 MH89793 Preliminary Information RLA RLB TLA TLB TZD2 TZC2 TZA3 TZB1 TZA2 TZB2 TZD1 TZC1 TZA1 NC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 TXA TXB NC NC NC VDD E20 RXB RXA VSS LOS NC RZA RZB Figure 2 - Pin Connections Pin Description Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Name RLA RLB TLA TLB TZD2 TZC2 TZA3 TZA3 TZA2 TZB2 TZD1 TZC1 TZA1 NC TXA Description Received Line A (Input). The A wire or Tip connection of the E1 receive line is connected to this pin. Received Line B (Input). The B wire or Ring connection of the E1 receive line is connected to this pin. Transmit Line B (Output). The A wire or Tip connection of the E1 receive line connected to this pin. Transmit Line B (Output). The B wire or Ring connection of the E1 receive line connected to this pin. Transmit Impedance Select. This pin is connected to pin 4 TLB to select 75 impedance. For 120 operation this pin is left open circuit. Transmit Impedance Select. This pin is connected to pin 3 TLA to select 75 impedance. For 120 operation this pin is left open circuit. Transmit Impedance Select. This pin is connected to pin 9 TZA2 to select 75 impedance. For 120 operation this pin is left open circuit. Transmit Impedance Select. This pin is connected to pin 10 TZB2 to select 120 impedance. For 75 operation this pin is left open circuit. Transmit Impedance Select. This pin is connected to pin 7 TZA3 to select 75 impedance. For 120 operation this pin is left open circuit. Transmit Impedance Select. This pin is connected to pin 8 TZB1 to select 120 impedance. For 75 operation this pin is left open circuit. Transmit Impedance Select. This pin is connected to pin 4 TLB to select 120 impedance. For 75 operation this pin is left open circuit. Transmit Impedance Select. This pin is connected to pin 3 TLA to select 120 impedance. For 75 operation this pin is left open circuit. Transmit Impedance Select. This pin is connected to pin 9 TZA2 to select 120 impedance. For 75 operation this pin is left open circuit. No Connection. This pin is used for internal connection. Transmit A (Input). A unipolar signal from the framer device used in conjunction with TXB is used to generate the bipolar output signal. 4-230 Preliminary Information Pin Description (Continued) Pin # 16 17 18 19 20 21 22 23 Name TXB NC NC NC VDD E2o RXB RXA Description MH89793 Transmit B (Input). A unipolar signal from the framer device used in conjunction with TXA is used to generate the bipolar output signal. No Connection. This pin is used for internal connection. No Connection. This pin is used for internal connection. No Connection. This pin is used for internal connection. D.C. Power (Input). +5V supply. 2048kHz Extraction Clock (Output). This clock is extracted by the device from the received signal. It is used internally to clock in data received from RLA and RLB. Receive B (Output). This pin is connected to the negative receive pin of the framer and provides a signal of the same format as RXA. Receiver A (Output). The bipolar CEPT signal received by the device at RLA and RLB input is converted to a unipolar format and output at this pin. This pin is connected to the positive receive pin of the framer. Ground (Input). D.C. power return path. Loss of Signal (Output). This pin goes low when 128 contiguous zeros are received on the RLA and RLB inputs. LOS is reset when 64 ones are received in dual E1 frame periods. No Connection. This pin is used for internal connection. Receive Impedance Select. This pin is connected to pin 17 RZB to select 75 input impedance. For 120 operation this pin is left open circuit. Receive Impedance Select. This pin is connected to pin 16 RZA to select 75 input impedance. For 120 operation this pin is left open circuit. 24 25 26 27 28 VSS LOS NC RZA RZB Functional Description The MH89793 is an E1 digital trunk interface which when used with an approved framer will conform to CCITT recommendation G.703 for PCM30 and I.431 for the ISDN. The functions provided include line driver and receiver circuitry, inductorless clock recovery, and loss of signal indication. Bipolar Line Transmitter The MH89793 transmitter interfaces to the transmission line through an internal pulse transformer which combines the TxA and TxB data into an AMI line coded signal. This is then passed through the 6dB pad prior to being applied to the line. Bipolar Line Receiver The MH89793 receiver interfaces to the transmission line through an internal pulse transformer which splits the received AMI lines signal into RxA and RxB. The line impedance is selected by linking appropriate option pins. Attenuation of the transmission line shall not exceed 6dB (at 1024kHz) and attenuation characteristics shall be close to the "square root of f". Af (dB) = AFref (dB)* f f ref Clock Extractor The MH89793 contains a clock extraction circuit that generates the E2o clock from the received data without the use of external crystals or a tunable inductor. The edge of the E2o extracted clock approximately aligns with the centre of the received data pulse. Where: AF - attenuation at frequency f in dB AFref - attenuation at frequency fref in dB (in kHz) fref - reference frequency (in this case 1024) kHz f - frequency in kHz 4-231 MH89793 Loss of Signal The circuitry on board the hybrid is capable of detecting 128 continuous ZEROs received on RLA and RLB and indicating this condition as a logic low on pin 9, (LOS). LOS will not reset until 64 ONEs are received in a two E1 frame period. Preliminary Information VDD 10K +5 0.1 1 41 16 35 TxMF 43 TxA TxB 42 13 9 7 8 10 27 28 RxA RxB 27 E2i 31 26 30 29 23 22 21 15 MH89793 33 2 31 26 32 RESET TAIS VDD DSTi DSTo F0i C4i E8Ko TxA RLA TLA TLB 1 3 4 2 16 TxB TZA1 TZA2 TZA3 TZB1 TZB2 RZA RZB RxA RxB E2o NETWORK CONNECTOR RLB TZD1 TDZ2 TZC1 TZC2 11 5 12 6 MT9079 8-15 D0-7 18-22 23 AC0-4 R/W 25 LOS 24 25 CS DS Foi C4i S/P VSS 7 IRQ MT9042 36 37 Figure 3a - Application Circuit for 75 Operation 4-232 Preliminary Information MH89793 VDD 10K +5 0.1 1 41 16 35 TxMF 43 TxA TxB 42 13 9 7 8 10 27 28 RxA RxB 27 E2i 31 26 30 29 23 22 21 15 MH89793 33 2 31 26 32 RESET TAIS VDD DSTi DSTo F0i C4i E8Ko TxA RLA TLA TLB 1 3 4 2 16 TxB TZA1 TZA2 TZA3 TZB1 TZB2 RZA RZB RxA RxB E2o NETWORK CONNECTOR RLB TZD1 TDZ2 TZC1 TZC2 11 5 12 6 MT9079 8-15 D0-7 18-22 AC0-4 23 R/W 25 LOS 24 25 CS DS Foi C4i S/P VSS 7 IRQ MT9042 36 37 Figure 3b - Application Circuit for 120 Operation 4-233 MH89793 0.23 Max (5.9 Max) Preliminary Information 0.063 Max (1.6 Max) 0.050 Typ (1.27 Typ) * 0.37 Max (9.5 Max) 0.08 Typ (2 Typ) * 0.10 + 0.005 0.020 + 0.005 (2.54 + 0.12) (0.51 + 0.12) 1.42 Max (36.1 Max) AAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAA 0.060 Typ (1.52) 1.08 Max (27.4 Max) AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA 0.125+0.015 (3.18+0.38) Notes: 1) Not to scale 2) Dimensions in inches). 3) (Dimensions in millimetres). *Dimensions to centre of pin. Figure 4 - Mechanical Data for 28 Pin Surface Mount Hybrid 0.1 (2.5) 0.89 (22.6) 0.04 (1.02) 0.06 (1.53) Figure 5 - Recommended Footprint for 28 Pin Surface Mount Hybrid 4-234 Preliminary Information MH89793 0.23 Max (5.9 Max) 0.31 Max (7.9 Max) 0.08 Typ (2 Typ) * 0.100+0.005 (2.54+0.12 0.063 Max(1.6 Min) * 0.26+0.015 (6.6+0.4) 0.020 + 0.005 (0.5 + 0.12) 0.050 Typ (1.27 Typ) AAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAA 0.90 Typ (22.9 Typ) 0.95 Max (24.2 Max) 1.42 Max (36.1 Max) 1 Notes: 1) Not to scale 2) Dimensions in inches). 3) (Dimensions in millimetres). *Dimensions to centre of pin. Figure 6 - Mechanical Data for 28 Pin DIL Hybrid 4-235 MH89793 Notes: Preliminary Information 4-236 |
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