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| MH88612BV-K Subscriber Line Interface Circuit (SLIC) Advance Information Features * * * * * * * * * Transformerless 2-wire to 4-wire conversion Battery and ringing feed to line. Off-hook and dial pulse detection. . Ring ground over-current protection. Constant current feed with constant voltage foldover. Relay driver. Power Denial. Wide Operating Range. Pin for pin compatible 600R and 900R variants. DS5066 ISSUE 2 January 1999 Ordering Information MH88612BV-K MH88612BV-4K 20 Pin SIL Package (600R) 20 Pin SIL Package (900R) 0C to 70C Description The SLIC provides a complete interface between a switching system and a subscriber loop. Functions provided include battery feed and ringing feed to the subscriber line, 2-Wire to 4-Wire hybrid interfacing, constant current feed with constant voltage foldback, and dial pulse detection. The device is fabricated using thick film hybrid technology in a 20-pin single in-line package. Applications Line interface for: * * * * PABX Intercoms Key Telephone Systems Control Systems LPGND VBAT PD VCC VEE AGND Constant Voltage Foldback Power Management TF TIP RING RF Current and Voltage Sensing 2-Wire to 4-Wire Conversion VR VX RV VRLY Over Current Protection Relay Drive Circuit Constant Current Feed Loop Supervision CAP RC RD CD SHK Figure 1 - Functional Block Diagram 1 MH88612BV-K TF LPGND VR IC VEE AGND PD VX TIP RING RF VCC RC RD RV VRLY CD VBAT CAP SHK Advance Information 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Figure 2 - Pin Connections Pin Description Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Name TF LPGND VR IC VEE AGND PD VX TIP RING RF VCC RC RD RV VRLY CD VBAT CAP SHK Description Tip Feed. Connects to external diode for protection Loop Ground. Is the system ground reference with respect to VBAT. Normally connected to AGND. Voice Receive (Input). The 4 wire analog signal to the device. Internal Connection. No connection should be made to this pin Negative Power Supply Voltage (-5V). Analog Ground. Connects to System Ground (Earth). Power Denial (Input). A logic high will isolate the battery voltage to Tip/Ring. Voice Transmit (Output). The 4-wire analog signal from the device. Tip Lead. Connects to the "Tip" lead of the telephone line. Ring Lead. Connects to the "Ring" lead of the telephone line. Ring Feed (Input). Normally connected to Ring relay for negative battery feed voltage and ringing voltage input. Positive Power Supply Voltage (+5V). Relay Control (Input). Active high. Relay Drive. Open collector sinks current when RC is at logic high. Ring Feed Voltage. Normally connected to pin 11 (RF) through a normally closed relay and to external diode protection. Relay voltage Supply (+5V). Clamping Diode. Normally connected to AGND. Negative Battery Feed Supply Voltage (-48V). Battery supply for the Subscriber Line. Typically -48VDC is applied to this pin. Ring Trip Filter Capacitor. Normally connected via an external capacitor to ground to prevent false ring trip. Must be open circuit to allow dial pulse detection. Switch Hook Detect (Output). A logic level 1 will indicate that the Subscriber Line is in the 'Off-Hook' state. Note 1: C4 in Figure 3 can be added permanently to this pin for certain dial pulse applications. 2 Advance Information Functional Description The SLIC performs a transformerless 2-wire to 4wire conversion of the analog signal. The 2-wire circuit is the balanced line going to the subscriber loop, while the 4-wire circuit is the audio signal going to and from devices such as the voice codec or switching circuit. The SLIC also provides a switch hook (SHK) status output which goes high when the telephone is set off-hook. MH88612BV-K disconnect the ringing voltage from pin 11 and reconnect to pin 15. At that time the SLIC will revert to constant current feed operation. For applications requiring Dial Pulse Detection the Capacitor connection to ground C1 should be controlled such that the capacitor is disconnected during Pulse Dialling. If the signalling method is unknown, a capacitor of approximately 56nf should be permanently fitted between CAP (pin 19) and ground. This should be in addition to the capacitor mentioned in the above paragraph. During off-hook conditions (on-line), the capacitor (C1) should not have a low impedance path to ground. This can be achieved using a transistor (Q1) and resistor (R2) as shown in Figure 3, with R2 providing a high impedance path for C1. When ringing is applied (RC = 5V) the transistor will short circuit R2 which will give C1 a low impedance path to ground and provide the required filtering. Other methods can be used to switch out C1, such as a relay or a codec system drive output (with a similar configuration as above). For applications using DTMF signalling, C1 can be permanently connected to ground. Constant Current Feed The MH88612BV-K family employs complex feedback circuits to supply a constant current feed or, if necessary, constant voltage feed to the line. With a nominal -48V battery the device will supply a constant current of typically 25mA to a line up to 1100. For longer lines there is insufficient battery voltage so the device automatically switches to constant voltage mode where Tip and Ring will stay at their minimum and maximum voltage levels and the supplied current will be reduced accordingly. The maximum line resistance supported is 2000 including the telephone set. Switch Hook Detection The SHK pin will go to logic 1 to indicate that a telephone connected to the line has gone off-hook (on-line). Off-hook will not be indicated if the loop resistance (including the telephone set) is too high for the device to support. The SHK output will toggle to indicate dial pulses on the line. If the capacitor on CAP (Pin 19) has not been switched out of circuit the dial pulses will be distorted. Current Limit The Tip or Ring of the telephone line may accidentally be shorted to ground. In such a case, current will only flow through the feed resistor. This high current will be sensed and reduced by the current limit circuit to a lower value to protect the internal circuitry. Power Denial Ringing And Ring Trip Detection In Figure 3 a ringing signal (e.g.90 Vrms and -48Vdc) is applied to the line by disconnecting pin 15 (RV) from pin 11(RF), and connecting the ringing voltage at pin 11 (RF) by use of the relay K1. The SLIC can detect an off-hook condition during ringing but there is a large AC component which must be filtered out to give a true off-hook condition at SHK. A 1.0F capacitor connected from pin 19 (CAP) to ground will provide adequate attenuation when ringing is applied. Once an off-hook condition has been detected a logic low should be applied to pin 13 (RC) which will deactivate the relay (K1) to 3 The power denial function is a feature of the MH88612 which allows for powering down of the subscriber loop. A logic high voltage applied to the power denial input effectively removes the battery voltage from the loop driver circuitry. The resulting ILOOP is negligible and power consumption is minimised. The power denial function is useful for disabling a loop which may have a ground fault. MH88612BV-K R1 K1 VBAT Advance Information 11 RF MH88612BV-K ~ + 90 VRMS 48V D4 D3 1 15 2 9 TF RV LPGND VR 3 D2 D1 VX 8 TIP TIP Protection Circuit SHK 20 RING 10 RING 13 RC +5V C2 K1 14 RD 16 VRLY PD 7 19 C1 CAP Q1 R3 RC -+ R2 C4 17 CD VBAT VCC 18 C3 -48V +5V -5V 12 VEE 5 AGND 6 R4 (Pin 13) Component List = earth = ground 200 + 10%, 1/4W R1 R2 470k + 5%, 1/4W R3, R4 10k + 5%, 1/4W C1 1.0F, + 10%, 25V electrolytic capacitor C2, C3 0.1F, + 20%, 50V ceramic de-coupling capacitors D1,D2, D3, D4 Diode rectifier 200V, 1A, IN4003 Q1 General purpose switching transistor K1 Relay E/M, 5V or 6V, 1 Form C C4 10nF - 56nF 20% 16V capacitor Protection Circuit - Depending on the application the Protection circuit may need to provide over-voltage and/or over-current protection. In certain circumstances no protection will be required. Figure 3 - Typical Application Circuit . 4 Advance Information Absolute Maximum Ratings* Parameter 1 DC Supply Voltage LPGND = AGND Symbol VCC VEE VBAT VRLY TS PD Min -0.3 -9 -60 -0.3 -40 MH88612BV-K Max 9 0.3 0.3 40 100 2 Units V V V V C W 2 3 Storage Temperature Package Power Dissipation * Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied. Recommended Operating Conditions Characteristics 1 Operating Supply Voltage Sym VCC VEE VBAT VRLY IRLY To Min 4.75 -5.25 -54 Typ 5.0 -5.0 -48 5 Max 5.25 -4.75 -42 100 0 70 Units V V V V mA C Test Conditions 2 3 Relay Driver Current Typical figures are at 25C with nominal 5V supplies and are for design aid only. DC Electrical Characteristics - Voltages are with respect to GNDA unless otherwise stated. Characteristics 1 Supply Current VCC VEE VBAT Sym ICC IEE IBAT PC ILoop 23 15 Min Typ 7.5 -5.1 800 3 160 1600 25 16.5 Max Units mA mA A mA mW mW mA mA Test Conditions PD = Logic High PD = Logic Low, Idle Standby VBAT = -48V Active (Off Hook) RLoop <1100 RLoop 2000 VBAT = -48V VBAT = -48V @ ILoop = 16mA, RLoopincludes telephone set VBAT = 48V Active high logic IOL = 8mA IOL = -100mA Active high logic 2 3 Power Consumption Constant Current Line Feed 27 19 2000 4 Operating Loop Resistance RLoop 5 6 7 8 9 Ring Ground Over-Current protection Off-Hook Detect Output Low Voltage (On-hook) Output High Voltage (Off-hook) RC, PD Control Input Input Low Volt (no activation) Input High Volt (activation) RC, PD control Input Input Low Current (no activation) Input high current (activation) PD Control Input Input Low Current Input High Current 45 mA VOL VOH VIL VIH IIL IIH IIL IIH 0.4 2.7 0.7 2.0 50 0.5 0.5 0.3 V V V V A mA mA mA LSTTL compatible DC Electrical Characteristics are over recommended operating supply voltages. Typical figures are at 25C with nominal 5V supplies and are for design aid only. 5 MH88612BV-K AC Electrical Characteristics Characteristics 1 2 3 4 5 6 7 Ringing Voltage Frequency Ringer Equivalence Number Ring Trip Detect time Input AC Impedance 2-wire Input Impedance at VR Output Impedance at VX Gain 2-wire to VX Gain relative to Gain @ 1kHz Gain VR to 2-wire Sym VRING FRING REN Zin Advance Information Min 17 Typ Max 90 25 2 300 Units Vrms Hz ms k dB Test Conditions Superimposed on VBAT = -48V -1.3 -0.3 -1.3 200 600 900 100 10 -1.0 MH88612BV-K MH88612BV-4K -0.7 +0.3 -0.7 Input + 3dBm, 1kHz across Tip and Ring 300-3400 Hz Input 0.5Vrms 1kHz at VR ZLoad = 600 300 - 3400 Hz Input 0.5Vrms, 1kHz across Tip and Ring ZLoad= 600 300-3400 Hz ZLoad= 600 300-600Hz 600-3400Hz Input + 3dBm, 1kHz across Tip and Ring Input 1.0Vrms 1kHz at VR Input 0.5Vrms, 1kHz 8 -1.0 dB Gain relative to Gain @ 1kHz 9 2-wire Return Loss over 300-3400Hz Transhybrid Loss Longitudinal to Metallic Balance Total Harmonic Distortion at VX at Tip and Ring Common Mode Rejection Ratio 2-wire to VX Idle channel Noise Power supply rejection ratio VCC VEE VBAT THL -0.3 20 30 +0.3 dB dB 10 11 12 20 40 46 30 55 55 0.1 0.1 1.0 1.0 dB dB dB % % dB THD 13 CMRR 40 Nc PSRR 26 26 26 50 +14 14 15 dBrnC @ 2 Wire and VX C- Message weighted 100 mVPP ripple, 1kHz on VCC/VEE/VBAT, measure at VX and across Tip and Ring dB dB dB Typical figure are at 25C and are for design aid only. 6 Advance Information MH88612BV-K 2.02 Max (51.30 Max) 0.08 Max 0.12 Max (2.03 Max)(3.05 Max) 0.50 max (12.70 max) 1 0.18 + 0.02 (4.57 + 0.51) 0.02 + 0.005 (0.51 + 0.13) 0.01 + 0.002 (0.25 + 0.05) *0.05 + 0.02 (1.27+ 0.51) * 0.10+ 0.01 (2.54 + 0.25) Notes: 1) Not to scale 2) Dimensions in inches. (Dimensions in millimetres) 3) Pin tolerances are non-accumulative. 4) Recommended soldering conditions: wave soldering max. temp: 260C for 10 secs. * Dimensions to centre of pin. Figure 4 - Mechanical Data 7 http://www.mitelsemi.com World Headquarters - Canada Tel: +1 (613) 592 2122 Fax: +1 (613) 592 6909 North America Tel: +1 (770) 486 0194 Fax: +1 (770) 631 8213 Asia/Pacific Tel: +65 333 6193 Fax: +65 333 6192 Europe, Middle East, and Africa (EMEA) Tel: +44 (0) 1793 518528 Fax: +44 (0) 1793 518581 Information relating to products and services furnished herein by Mitel Corporation or its subsidiaries (collectively "Mitel") is believed to be reliable. However, Mitel assumes no liability for errors that may appear in this publication, or for liability otherwise arising from the application or use of any such information, product or service or for any infringement of patents or other intellectual property rights owned by third parties which may result from such application or use. Neither the supply of such information or purchase of product or service conveys any license, either express or implied, under patents or other intellectual property rights owned by Mitel or licensed from third parties by Mitel, whatsoever. Purchasers of products are also hereby notified that the use of product in certain ways or in combination with Mitel, or non-Mitel furnished goods or services may infringe patents or other intellectual property rights owned by Mitel. This publication is issued to provide information only and (unless agreed by Mitel in writing) may not be used, applied or reproduced for any purpose nor form part of any order or contract nor to be regarded as a representation relating to the products or services concerned. The products, their specifications, services and other information appearing in this publication are subject to change by Mitel without notice. No warranty or guarantee express or implied is made regarding the capability, performance or suitability of any product or service. Information concerning possible methods of use is provided as a guide only and does not constitute any guarantee that such methods of use will be satisfactory in a specific piece of equipment. It is the user's responsibility to fully determine the performance and suitability of any equipment using such information and to ensure that any publication or data used is up to date and has not been superseded. Manufacturing does not necessarily include testing of all functions or parameters. These products are not suitable for use in any medical products whose failure to perform may result in significant injury or death to the user. All products and materials are sold and services provided subject to Mitel's conditions of sale which are available on request. M Mitel (design) and ST-BUS are registered trademarks of MITEL Corporation Mitel Semiconductor is an ISO 9001 Registered Company Copyright 1999 MITEL Corporation All Rights Reserved Printed in CANADA TECHNICAL DOCUMENTATION - NOT FOR RESALE |
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