MH88628

® MH88628 Central Office SLIC Preliminary Information Features Programmable gain, network balance and impedance Transformerless 2-4 wire conversion Constant current with constant voltage fallback for long loop capability Pin compatible with MH88632, MH88620 and MH88628 Unbalanced detection (Tip, Ring ground sensing) Auto ring trip with zero crossing On-Hook transmission (ANI) capability Compatible with requirements of CCITT, DOC/FCC and CSA/UL Excellent power dissipation (SIL vertical mounting) 12/16kHz meter pulse injection control Solid State TIP/RING reversals Ringing amplifier MH88628 ISSUE 5 April 1995 Ordering Information 40 Pin SIL Package 0° C to 70° C Applications On/Off Premise PBX Line Cards DID (Direct Inward Dial) Line Cards Central Office Line Cards Description The Mitel MH88628 SLIC provides all of the functions required to interface 2-wire off premise subscriber loops to a serial TDM, PCM, switching network of a modern PBX. The MH88628 is manufactured using thick-film hybrid technology which offers high voltage capability, reliability and high density resulting in significant printed circuit board area savings. A complete C.O. line card can be implemented with very few external components. VBat LGND LCA VDD VEE AGND RING RF1 RF2 TIP TF1 TF2 Matched Feed Resistors Driver Circuitry and Speech Circuit Loop Current Set Switch-hook Threshold Set Ring Filter Switch-hook Detect SHK NS UD Unbalanced Detection Impedance...