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MH88617 Datasheet(PDF) 3 Page - Mitel Networks Corporation |
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MH88617 Datasheet(HTML) 3 Page - Mitel Networks Corporation |
3 / 16 page Advance Information MH88617 2-159 18 15 RV Ringing Voltage. A low level AC sinusoid is applied to this pin. This signal is amplified and output from TIP/RING to the line as the ringing signal, when RC is at logic 1. This pin should be driven with a low impedance AGND centred source. 7 16 ESE External Signal Enable. Meter pulse input enable. 8 17 ESI External Signal Input. Meter pulse input. 2, 4,10 11,13 ,23 25,24 18 IC Internal Connection. No connection should be made to this pin. 14 19 SHK Switch Hook Detect (Output). A logic 1 at this pin indicates when the subscriber has gone Off-Hook. 620 RC Ringing Control (Input). A logic 1 will cause the ringing voltage to be applied to the line. 19 21 ZA Line Impedance. Connect passive components from ZA to ground to match input and line impedance. Pin Description (continued) 28 Pin DIL 21 Pin SIL Name Description Functional Description The MH88617 is a Subscriber Line Interface Circuit (SLIC) used to provide an analog interface between the 4-wire connection and the 2-wire subscriber line of a communications system. It provides powering of the subscriber line along with signalling, control and status circuits. This combines to provide a comprehensive line and interface solution in applications such as PABX, Key Systems, Analog Terminal Adapters, Pair Gain Systems, Fibre in the Loop and Wireless Local Loop. External Protection Circuit An External Protection Circuit assists in preventing damage to the device and the subscriber equipment, due to over-voltage conditions (see Figure 3). Also reference MSAN-156. 2-4 Wire Conversion The SLIC converts the balanced 2-Wire input at Tip and Ring to a ground referenced signal at VX. The device converts the ground referenced signal input at VR to a balanced 2-Wire signal across Tip and Ring. Normally the VX and VR pins connect to a Codec that interfaces the analog signal to a digital network.During full duplex transmission, the signal at Tip and Ring consists of both the signal from the device to the line and the signal from the line to the device. The signal input at VR being sent to the line, must not appear at the output VX. In order to prevent this, the device has an internal cancellation circuit, the measure of this attenuation is Transhybrid Loss (THL). The MH88617 has the ability to transmit analog signals from VR through to Tip and Ring when on- hook. This can be used when sending caller line identification information. Battery Feed and Loop Current Adjust The MH88617 has an active feedback circuit to regulate the DC current to the subscriber line. This current is programmable over a wide range via the LCA pin. With LCA open circuit the current will be set to 24mA. This can be increased up to 55mA by connecting a resistor between LCA and VCC or reduced down to 14mA by connecting a resistor between LCA and AGND. MSAN-156 shows a table of resistor values and loop current. The line driver stage is biased between +5V and -48V DC. Therefore it should be noted that loop current will flow in the +5V supply, this must be taken into consideration when choosing the +5V supply. The device will operate over a very wide VBAT supply range but care must be taken when programming the constant current that the maximum power dissipation is not exceeded. For the majority |
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