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MT91610 Datasheet(PDF) 3 Page - Mitel Networks Corporation |
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MT91610 Datasheet(HTML) 3 Page - Mitel Networks Corporation |
3 / 18 page Preliminary Information MT91610 3 20 Z1 Line Impedance Node 1. A resistor of scaled value "k" is connected between Z1 and Z2. This connection can not be left open circuit. 21 CP5 Line Impedance AC couple. A 0.1uF cap must be connected between this pin and Z1 (pin 16) 22 Z2 Line Impedance Node 2. This is the common connection node between Z1 and Z3. 23 Z3 Line Impedance Node 3. A network either resistive or complex of scaled value "k" is connected between Z3 and Z2. This connection can not be left open circuit. 24 GTX0 Gain Node 0. This is the common node between Z3 and VX where resistors are connected to set the 2W to 4W gain. 25 VX Transmit Audio. 4W analog signal from the SLIC. 26 ESI External Signal Input. 12 / 16 KHz signal input 27 GTX1 Gain Node 1. The common node between VR and the audio input from the CODEC or switching network where resistors are fitted to sets the 4W to 2W gain 28 VR Receive Audio. 4W analog signal to the SLIC. 29 CP6 Ringing Cap. A 0.47uF cap should be connected between this pin and GND for ringing voltage filtering. 30 RC Ringing Control. An active high (+5V) on this pin will set up the DC feed and gain of the SLIC to apply 20 Hz ringing. When low (0V) set the SLIC in normal constant current mode of operation. 31 UD UnBalance Detect. To indicate an offset current between Tip and Ring 32 VBAT VBAT. The negative battery supply, typically at -48V 33 SHK Switch Hook. This pin indicates the line state of the subscribers telephone. The output can also be used for dial pulse monitoring. This pin is active high 34 CP7 Deglitching Cap. A 33nF should be connected between this pin and GND 35 RV Ringing Voltage. 20 Hz sinusoidal or square wave AC in for balance ringing 36 VEE Negative supply rail, -5V. Pin Description (continued) Pin # Name Description Functional Description Refer to Figure 4 for MT91610 components designation. The MT91610, with external bipolar transistors, functions as an Analog Line SLIC for use in a 4 Wire switched system. The SLIC performs all of the BORSH functions whilst interfacing to a CODEC or switching system. 2 Wire to 4 Wire conversion The SLIC performs 2 wire to 4 wire conversion by taking the 4 wire signal from an analog switch or voice CODEC, and converting it to a 2 wire differential signal at Tip and Ring. The 2 wire signal applied to tip and ring by the phone is converted to a 4 wire signal, which is the output from the SLIC to the analog switch or voice CODEC. Gain Control It is possible to set the Transmit and Receive gains by the selection of the appropriate external components. The gains can be calculated by the following formulae: 2W to 4W gain Gain 2 - 4 = 20 Log [ R8 / R7] 4W to 2W gain Gain 4 - 2 = 20 Log [0.891 * [R10 / R9)] |
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Similar Description - MT91610 |
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