MH88622 DUAL OPS SLIC Preliminary Information Features ISSUE 3 April 1995 Ordering Information • Dual SLIC • Ringing generation • On-hook transmission • Transformerless 2-4 wire conversion • Constant current feed • Battery Feed to the line • Tip Ring reversal capability • Over current protection • Off-Hook detection MH88622 -1, -2, -3,-5 0°C to 70°C Description • Logic interface for SHK, RC, LR, ESE, LCS • Metering injection • Wide V Bat operating range • Minimum installation space • ESE ramped output The Mitel MH88622 is a Dual Subscriber Interface Circuit which provides a complete interface between the telephone lines a dual codec, requiring a dual rail supply, battery and dc supply for ringing generation. The functions provided by the MH88622 includes 2-4 Wire conversion, constant current line feed, signalling and control. The SLIC manufactured using thick film hybrid technology which offers high voltage capability, reliability and high density resulting in a significant area saving on the printed circuit board. A complete C.O. type solution can be implemented with minimal external components. Different variants are provided to meet different country line impedance, they are: Applications • Pair Gain • CT2 • Cordless local loops SHK1 -1 -2 -3 -5 Line Drivers/ Feed VX1 VR1 ESI1 ESE1 2-4 Wire Conversion VDD VEE AGND 220Ω + (820Ω // 115nF) 600Ω 370Ω + (620Ω // 310nF) 200Ω + (680Ω // 100nF) LCS2 LCS1 Loop Supervision LR1 TIP1 RING1 40 Pin SIL Package SHK2 Loop Supervision Over Current Protection & Constant Current Feed Over Current Protection & Constant Current Feed Ring Generator Line Drivers/ Feed LR2 TIP2 RING2 2-4 Wire Conversion VX2 VR2 ESI2 ESE2 VBat DCRI RC1 RF1 RF2 RGV RG1 RC2 Figure 1 - Functional Block Diagram 2-173 MH88622 Preliminary Information TIP1 RING1 VBAT DCRI GND ESI1 ESE1 VR1 SHK1 LCS1 VX1 VEE GND VDD LR1 RC1 NC NC RF1 RF2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 RGV RG1 NC NC RC2 LR2 VDD GND VEE VX2 LCS2 SHK2 VR2 ESE2 ESI2 GND DCRI VBat RING2 TIP2 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 Figure 2 - Pin Connections Pin Description Pin # Name 1 TIP1 2 RING1 3 VBAT Battery Voltage. Typically -48V dc is applied to this pin. This should be connected to pin 38 of the hybrid on the PCB. 4 DCRI DC Ringing Voltage Input. A continuous 120V dc is applied to this input to achieve 90Vrms ringing. This should be connected to pin 37 of the hybrid. 5 GND Ground. This pin should be tied to pins 13, 28 & 36 on the PCB. 6 ESI1 External Signal Input (Input). A continuous signal should be applied to this pin which will be switched to “Tip” and “Ring” of subscriber 1. 7 ESE1 External Signal Enable (Input). The external signal to the subscriber 1 is controlled by a logic level applied to this pin. 8 VR1 Receive (Input). 4-Wire GND referenced audio input for subscriber 1. 9 SHK1 Off Hook Indication (Output). A logic low output indicates when subscriber 1 equipment has gone off hook. 10 LCS1 Loop Current Set 1. Logic 1 gives ILoop = 40mA, Logic 0 gives ILoop = 25mA 11 VX1 Transmit (Output). 4-Wire, GND referenced audio output for subscriber 1. 12 VEE Negative Supply Voltage. -5Vdc. Connects to pin 29 of the hybrid on the PCB. 13 GND Ground. Return path for VDD, VEE, VBat & DCRI. This pin should be connected to pins 5, 28 & 36 of the hybrid on the PCB. 14 VDD Positive Supply Voltage. +5Vdc. Connect to pin 27 of the hybrid on the PCB. 15 LR1 Line Reversal. A logic 1 applied to LR1 will reverse the “Tip” and “Ring” to subscriber 1. This pin has an internal pull down. 16 RC1 Ringing Control (Input). A logic level applied to this pin enables ringing to be applied across Tip and Ring of subscriber 1. 2-174 Description Tip Lead. Connects to the “TIP” lead of subscriber line 1. Ring Lead. Connects to the “RING” lead of subscriber line 1. MH88622 Preliminary Information Pin Description (Continued) Pin # Name Description 17 NC No Connection. This pin should not be connected. 18 NC No Connection. This pin should not be connected. 19 RF1 Ringing Frequency Node 1 (Input). A capacitor is connected between RF1 & RF2 and determines the frequency of the ringing generator. 20 RF2 Ringing Frequency Node 2 (Input). Two capacitors are connected between RF1& RF2 and from RF2 to AGND. This determines the frequency of the ringing generator. 21 RGV Ringing Gain Voltage. Connects to RG1 through a resistor to reduce the output ringing voltage. When left open circuit output ringing voltage is 90Vrms. 22 RG1 Ringing Gain Node 1. Connects to RGV through a resistor to reduce the output ringing voltage. When left open circuit output ringing voltage is 90Vrms. 23 NC No Connection. This pin should not be connected. 24 NC No Connection. This pin should not be connected. 25 RC2 Ringing Control (Input). A logic level applied to this pin enables ringing to be applied across Tip and Ring of subscriber 2. 26 LR2 Line Reversal. A logic 1 applied to LR2 will reverse the “Tip” and “Ring” to subscriber 2. This pin has an internal pull down. 27 VDD Positive Supply Voltage. +5Vdc. This pin should be connected to pin 14 of the hybrid on the PCB. 28 GND Ground. Return path for VDD, VEE, VBat & DCRI. This pin should be connected to pins 5, 13 & 36 of the hybrid on the pcb. 29 VEE Negative Supply Voltage. -5Vdc. This pin should be connected to pin 12 of the hybrid on the PCB. 30 VX2 Transmit (Output). 4-Wire GND referenced audio input for subscriber 2. 31 LCS2 Loop Current Set 2. Logic 1 gives ILoop = 40mA, Logic 0 gives ILoop = 25mA. 32 SHK2 Off Hook Indication (Output). A logic high output indicates when subscriber 2 equipment has gone off hook. 33 VR2 Receive (Input). 4-Wire GND referenced audio input for subscriber 2. 34 ESE2 External Signal Enable (Input). The external signal to subscriber 2 is controlled by a logic level applied to this pin. 35 ESI2 External Signal Input. A continuous signal should be applied to this pin which will be switched to “Tip” and “Ring” of subscriber 2. 36 GND Ground. This pin should be tied to pins 5, 13 & 28 on the PCB. 37 DCRI DC Ringing Voltage Input. A continuous 120Vdc is applied to this input to achieve 90 Vrms ringing. This should be connected to pin 4 of the hybrid on the PCB. 38 VBAT Battery Voltage. Typically -48V dc is applied to this pin. This should be connected to pin 3 of the hybrid on the PCB. 39 RING2 Ring Lead. Connects to the “Ring” lead of subscriber line 2. 40 TIP2 Tip Lead. Connects to the “Tip” lead of subscriber line 2. 2-175 MH88622 Preliminary Information Absolute Maximum Ratings *- All voltages are with respect to GNDA unless otherwise stated. Parameter Symbol Min Max Units 1 Supply Voltages - Referenced to VSS (GND) VEE VDD VDCRI VBat +0.3 -0.3 -0.3 -60 -15 +15 +180 0.3 V V V V 2 Operating Temperature TAMB -40 +85 °C 3 Storage Temperature TS -55 +125 °C * Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied. DC Electrical Characteristics Characteristics 1 2 Operating Loop Current S U P P L Y 3 Operating Supply Current (per Channel) Sym Min‡ Typ* Max‡ Units VEE VDD VDCRI VBat -4.75 4.75 110 -60 -5 5 120 -48 -5.25 5.25 160 -20 V V V V IEE IDD IDCRI 30 30 15 mA mA mA IBat 5 mA High Level Input Voltage LR, RC, ESE, LCS VIH Low Level Input Voltage LR, RC, ESE, LCS VIL 0.5 V High Level Input Current LR, RC, ESE, LCS IIH 700 µA Low Level Input Current LR, RC, ESE, LCS IIL 10 µA High Level Output Current SHK IOH 0.4 mA Low Level Output Current SHK IOL 4 mA High Level Output Voltage SHK VOH Low Level Output Voltage SHK VOL 11 Constant Current Line Feed ILoop 12 Maximum Operating Loop RL 13 Power Consumption PC 300 mW 4 5 I N P U T S 6 7 8 9 10 O U T P U T S 4.5 V 25 * Typical figures are at 25°C with nominal +5V supplies and are for design aid only. ‡ Max & Min figures guaranteed over 0°C to 70°C only 2-176 On-hook On-Hook Ringing (REN=1) Idle V 4.75 23 Test Comments 0.4 V 27 mA 500 1500 Ω Ω LCS = 0 @ 25mA -24V @ 25mA -48V inclusive of telephone set Excluding PBAT & PDCRI MH88622 Preliminary Information AC Electrical Characteristics* Characteristics 1 Sym Gain VR to 2-Wire Min‡ Typ† -0.2 0 Gain relative to Gain @ 1kHz -6.2 Gain relative to Gain @ 1kHz THL 22 5 Ringing Signal Voltage 40 6 Ringing Frequency 17 7 Ringing Capability 4 Input 1.0Vrms 1kHz @ VR, Zload = Zin 300-3.4kHz -5.8 dB Input 3dBm 1kHz @ 2W Zsource = Z in 300-3.4kHz 7.5 mA 30 dB 68 Hz 20 10 Longitudinal to Metallic Balance -1 Variant -2 Variant -3 Variant -5 Variant Metallic to Longitudinal Balance -2 Variant only See Table 1 REN 1750Ω impedance @ 20Hz min. dB Ripple 0.1 VPP 1kHz dB Input 0.5 Vrms 1kHz across Tip & Ring Zload = Zin 30 30 30 9 2-wire Return Loss 300-3.4kHz Vrms Min 65Vdc differential between DCRI & VBAT PSRR VBat VDD/VEE VDCRI 11 Input AC Impedance (2- wire) -1 variant (220Ω + 820Ω // 115nF) -2 variant (600Ω) -3 variant (370Ω + 620Ω // 310nF) -5 variant (200Ω + 680Ω // 100nF) dB +0.15 3 Off-Hook Detect Threshold 8 Power Supply Rejection Ratio -6 Test Comments +0.2 +0.15 2 Gain 2-wire to VX 4 Transhybrid Loss Max‡ Units 35 40 55 53 58 53 46 40 46 dB dB dB dB dB dB dB dB Input 0.5Vrms 50-300Hz 300-1000Hz 1k-4kHz 200Hz to 1kHz 3kHz 300Hz to 3k4Hz 300Hz to 600Hz 600Hz to 3k4Hz 60 40 dB dB 200Hz to 1kHz 1kHz to 4kHz Ω 1kHz @ 2-wire ZIN 600 900 700 823 12 Input Impedance @ VR 230 kΩ 13 Output Impedance @ VR 10 Ω 0.2 0.2 % % Input 4dBm @2-Wire Input 1V at VR 60 dB Input 0,5V, 1kHz 14 Total Harmonic Distortion THD at VX at Tip & Ring 15 Common Mode Rejection Ratio 2-Wire to VX CMRR 16 Idle Channel Noise 40 NC at VX at 2-wire 17 On-Hook Transmission Signal Input Level Gain 18 External Signal Output Level dBrn C 15 15 2.0 6 1.75 2.2 Vrms VBat = -48V dB T-R load = 10kΩ min. Vrms VBat = -48V T-R load = 200Ω 2-177 MH88622 Preliminary Information AC Electrical Characteristics* (Continued) Characteristics Sym 19 SHK Rise Time Fall Time Min‡ Typ† tR tF 20 Analogue Signal Overload Level @ Tip & Ring 1 1 ms ms 4 dBm 21 Ring Trip Delay 100 22 Outband Noise 23 Crosstalk Max‡ Units No Channel 1 to 2 Channel 2 to 1 Test Comments Dial Pulse Detection @ 1kHz ms -70 dB Refer to BS6305 section 4.1.4 & fig 3 for details of limits -80 -80 dB dB @ 1kHz * AC Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated. † Typical figures are at 25°C with nominal + 5V supplies and are for design aid only. ‡ Max and Min figures guaranteed over 0°C to 70°C only. Notes: Impedance set to variant impedance Test conditions uses a Zin value as specified by variant number. Test conditions use a transmit and receive gain set to 0dB default and a Zin value of 600Ω unless otherwise stated. . VDCRI VBat +5V VDD VR1 VX1 VEE CODEC SUBSCRIBER 1 RC1 -5V LR1 ESE1 GND LINE CONTROLLER LOGIC ESI1 SHK1 SUBSCRIBER 1 TIP1 SHK2 VR2 VX2 CODEC SUBSCRIBER 2 RC2 RING1 LR2 TIP2 ESE2 ESI2 12/16kHz SOURCE DCRI RING2 RGV RG1 SUBSCRIBER 2 RF1 CF1 RF2 CF2 120VDC SUPPLY Figure 3 - Loop Start SLIC Configuration Application Circuit 2-178 MH88622 Preliminary Information Functional Description Two Wire Port Termination Impedance The SLIC uses a Transformerless 2-4 Wire converter for each subscriber which can be connected to a CODEC to interface the 2-Wire subscriber loop to a time division multiplexed (TDM), pulse code modulated (PCM), digital link. The Tip/Ring impedance (Zin) is fixed for each variant. Powering of the subscriber line is provided through precision battery feed resistors on the hybrid. The thick film hybrid circuit contains control, signalling and status circuits which combine to provide a complete solution simplifying the manufacture of line cards. The transmit and receive gain of the MH88622 is internally set. Approvals FCC part 68, CCITT, DOS CS-03, UL 1459, CAN/ CSA-22.2 N0. 225-M90 and ANSI/EIA/TIA-464-A are system level safety standards and performance requirements. As a component of a system, the MH88622 is designed to comply with the applicable requirements of these specifications. Battery Feed The SLIC is designed for a nominal battery voltage of -48 Vdc and can provide the constant feed current for 1500Ω loop under this condition. The interface circuit is designed to be operated up to a maximum of -60V dc battery feed voltage without damage, providing a minimum loop length capability of 2000Ω. There is also a function on the SLIC that provides for Tip-Ring reversal. Current Limit Primary over current protection is inherent in the current limiting feature of the battery feed circuit. Transmit and Receive Gain Internal Ringing Generator The MH88622 offers an on board ringing generator requiring only two external passive components and a DC voltage source to produce a sine wave of between 17Hz to 68Hz. An internal signal is amplified by a user programmed amount and is applied to Tip and Ring. The programmable gain must be set using RGV and RG1 to ensure that distortion of the ringing signal is minimised. With V BAT = -48Vdc and VDCRI = +120Vdc and the ringing voltage = 90Vrms RGV and RG1 should be left open circuit. By adding an external resistor between RGV and RG1 it is possible to reduce the ringing voltage applied by the driver section to Tip and Ring. The DC voltage source should be continuously applied to the MH88622. The ringing voltage will only be applied when the RC pin of the relevant subscriber is activated. Typ. Frequency (Hz) CF1, CF2 (nF) 17 100 25 68 35 47 50 33 Table 1 - Ring Generator Capacitor Selection Current limiting is provided for both Tip and Ring unbalanced conditions. The maximum loop current limit is set internally on the interface and current limiting does not affect the longitudinal or the signal balance of the device. To set ILoop to 40mA tie the LCS pin high (Logic 1), to set ILoop to 25mA the LCS pin may be left open circuit or tied low (Logic 0). 12-16kHz Meter Pulse The MH88622 provides control of an external signal path to the driver. A 12/16 KHz continuous signal should be applied to the ESI pin. Control of the ESE input allows the metering signal to be transmitted to the line with a ramped up and down amplitude to reduce noise on the line. Typical ramp time is 10mS. 2-179 MH88622 Preliminary Information Off-Hook and Dial Pulse Detection High Voltage Capability The SHK pin goes low when e DC loop current exceeds a specified level. The threshold level is internally set by the bias voltage of the switch hook detect circuit. Inherent in the thick film process is the ability of the thick film process dielectric strengths of greater than 1000 VAC or 1500 VDC. The thick film process allows easy integration of surface mount components such as the high voltage bi-polar power transistor line drivers. This allows for simpler, less elaborate and less expensive protection circuitry required to handle high voltage transients and fault conditions caused by lightening, induced voltages and power line crossing. Dial pulse can be detected by monitoring the interruption rate at the SHK pin. These dial pulses may need to be debounced by the systems software. Ring Trip Detection The interface permits detection of an Off-Hook condition during ringing. If the subscriber set goes Off-Hook when the ringing signal has been applied, the DC loop current flow will be detected within approx. 100msecs and the SHK output will go low. The ringing is automatically disabled by the internal hardware. Longitudinal Balance Precision laser trimming of resistors in the hybrids ensures good overall longitudinal balance. On Hook Transmission The MH88622 provides for on-hook transmission which supports features such as Automatic Number identifications (ANI). Loop Length The MH88622 can accommodate loop length of up to 2000Ω minimum (including the subscriber equipment). The interface circuitry can operate in the presence of induced longitudinal currents of up to 40mA rms at 60Hz. T PROTECTION T PTC RESISTOR 5 Ohms R R PTC RESISTOR 5 Ohms Figure 4 - Typical Protection Circuit 2-180 TISP2290 or P2702AB MH88622 Preliminary Information 4.2 + 0.03 0.25 Max (6.4 Max) Side View (107 + 1) 0.95 Max (24.13 Max 1 2 3 4 39 40 0.010 + 0.002 (0.25 + 0.05) 0.27 Max (6.9 Max) * Notes: 1) Not to scale 2) Dimensions in inches). 3) (Dimensions in millimetres). *Dimensions to centre of pin & tolerance non accumulative. 0.05 + 0.02 (1.3 + 0.5) * 0.05 + 0.02 (1.27 + 0.5) 0.020 + 0.005 (0.51 + 0.13) 0.180 + 0.02 (4.6 + 0.5) 0.100 + 0.010 (2.54 + 0.26) Figure 5 - Mechanical Data 2-181 MH88622 Notes: 2-182 Preliminary Information