PDF MH88634-2 Data sheet ( Hoja de datos )

Número de pieza	MH88634-2
Descripción	Central Office Interface Circuit Preliminary Information
Fabricantes	Mitel Networks
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No Preview Available ! MH88634 ® Central Office Interface Circuit Preliminary Information Features • Loop Start Trunk Interface • 600 ohm input impedance, -2 variant • Line state detection outputs: forward loop, reverse loop, ringing voltage, switch hook On-hook reception • Transformerless 2W to 4W conversion • One loop start relay driver • +/- 5V operation • Small footprint area (<4.75cm2) Applications Interface to Central Office for: • PABX • Key Telephone Systems • Channel Bank • Voice Mail • Terminal Equipment • Digital Loop Carrier • Optical Multiplexer ISSUE 2 April 1995 Ordering Information MH88634-2 21 Pin SIL Package 0°C to 70°C Description The Mitel MH88634 Central Office Trunk Interface circuit provides a complete audio and signalling link between audio switching equipment and a central office. The functions provided by the MH88634 include 2-4 Wire conversion, 600 ohm input impedance and network balance. The device is fabricated as a thick film hybrid incorporating various technologies for optimum circuit design and very high reliability. XLA XLB XLC XLD LRC LRD RING TIP VDD VEE AGND RV FL RL SHK Dummy Ringer Status Detection Loop Termination Loop Relay Driver VRLY RGND 2-4 Wire Hybrid Impedance Matching Network Balance Figure 1 - Functional Block Diagram Receive Gain Transmit Gain Rx Tx 2-253 1 page Preliminary Information MH88634 Loop Electrical Characteristics* Characteristics Symbol 1 Ringing Voltage 2 Ringing Frequency VR 3 Ringer Equivalence Number REN Min 40 16 0.5 Typ† 90 20 1 Max 110 33 2 Units Vrms Hz 4 Operating Loop Current 5 Off-Hook DC Resistance 6 Leakage Current (Tip-Ring to AGND) 7 FL Threshold Tip-Ring (On-hook) Tip-ring Current (Off-Hook) 8 RL Threshold Tip-Ring (On-Hook) Tip-Ring (Off-Hook) 16 70 mA 270 280 Ω 10 mA +30 +10 † -30 -8 † +40 Vdc 15 mA -40 Vdc -15 mA * DC Electrical Characteristics are over recommended operating conditions unless otherwise stated. † Typical figures are at 25°C and are for design aid only. Test Conditions Dummy ringer is 17K in series with 330nF. Type A ringing @ 20mA @ 1000Vac LRC = 0v LRC = 5V LRC = 0v LRC = 5V AC Electrical Characteristics * Characteristics Symbol 1 2-wire Input Impedance (-2 variant) 2 Return Loss at 2-wire (Zin = Ref = 600) 3 Longitudinal to Metallic Balance Zin RL 4 Transhybrid Loss 5 Gain (voltage) 2 wire to Tx 6 Gain (Voltage) Rx to 2 wire 7 Input impedance at Rx 8 Output impedance at Rx 9 Signal Overload Level at 2-wire output at Tx 10 Total Harmonic Distortion at 2-wire output at Tx THL THD Min 20 58 58 53 20 10 4.0 0.95 Typ† 600 0 -2 5 Max Units Ω dB dB dB dΒ dB kΩ Ω dBm Vrms 1.0 % 1.0 % 11 Idle Channel Noise at 2-Wire at Tx NC dBrnC 15 15 12 Power Supply Rejection Ratio PSRR at 2-wire and Tx VDD 25 dB dB VEE 25 dB dB * AC Electrical Characteristics are over recommended operating conditions unless otherwise stated. † Typical figures are at 25°C and are for design aid only. Test Conditions 200-3400 Hz 200Hz 1000Hz 3.4kHz 200-3400Hz 1024Hz Spec Freq % THD < 5% Ref 600Ω @ 20mA Input 0.5V, 1kHz @ Rx Input 0.5V, 1kHz @ Tip-Ring Ripple 0.1V, 1kHz 2-257 5 Page

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Número de pieza	Descripción	Fabricantes
MH88634-2	Central Office Interface Circuit Preliminary Information	Mitel Networks

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