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| (R) MH88636-4 Central Office Interface Circuit Preliminary Information zFeatures * * * * * Loop Start Trunk Interface 900 Input Impedance 2-4 Wire Conversion On-Hook Reception Line State Detection Outputs: - Forward Loop - Reverse Loop - Switch Hook - Ringing Voltage Relay Driver Industrial Temperature Range option DIL and SMT versions Meets FCC part 68 Leakage Current Requirements ISSUE 2 January 1997 Ordering Information MH88636AD-4I 28 Pin DIL Package -40C to 85C MH88636AD-4 28 Pin DIL Package MH88636AS-4 28 Pin SMT Package 0C to 70C Description The Mitel MH88636-4 Central Office Trunk Interface circuit provides a complete analog and signalling link between audio switching equipment and a subscriber Line. The device is fabricated as a thick film hybrid technology for optimum circuit design and very high reliability for both commercial and industrial temperature changes. * * * * Applications Interface to Central Office for: * PABX * Key Telephone Systems * Channel Bank * Voice Mail * Terminal Equipment * Digital Loop Carrier * Optical Multiplexer RV FL RL SHK XLA XLB XLC XLD VCC VEE AGND Status Detection TIP RING Line Termination & Impedance Matching 2 - 4 Wire Hybrid Receive Gain RX Transmit Gain LRC LRD Loop Relay Driver Network Balance TX VRLY Figure 1 - Functional Block Diagram 2-287 MH88636-4 Preliminary Information XLB XLC IC TIP RING IC IC IC IC IC IC RL FL RV 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 XLD XLA LRD VRLY VCC AGND VEE LRC SHK IC RX TX IC IC Figure 2 - Pin Connections Pin Description Pin # 1 2 3 4 5 6 - 11 12 Name XLB XLC IC TIP RING IC RL Description Loop Relay Contact B. Connects to XLA through the Loop Relay contacts (K1) when the relay is activated. Loop Relay Contact C. Connects to XLD through the Loop Relay contacts (K1) when the relay is activated. Internal Connection. No connection should be made to this pin. Tip lead. Connects to the Tip lead of a Telephone Line. Ring Lead. Connects to the Ring lead of a Telephone Line. Internal Connection. No connection should be made to this pin. Reverse Loop detect. In the on-hook status, a logic 0 output indicates that reverse loop battery is present. In the off-hook state, a logic 0 output indicates that reverse loop current is present. Forward Loop Detect. In the on-hook status, a logic 0 output indicates that forward loop battery is present. In the off-hook state, a logic 0 output indicates that forward loop current is present. Ringing Voltage Detect (Output). A logic 0 indicates that ringing voltage is across the Tip and Ring leads. Internal Connection. No connection should be made to this pin. Transmit (Output). 4 Wire ground (AGND) referenced analog output. Receive (Input). 4 Wire ground (AGND) referenced analog input. Switch Hook (Output). A logic 0 indicates the presence of forward or reverse battery when LRC is logic 0 and the presence of forward or reverse loop current when LRC is logic 1. Loop Relay Control (Input). A logic 1 activates the Loop Relay Driver output (LRD). Negative Power Supply. -5V DC Analogue Ground. 4 Wire ground. Normally connected to System Ground. Positive Power Supply. +5V DC Relay Supply Voltage. Typically +5V. Connects to the relay supply voltage. 13 FL 14 15, 16, 19 17 18 20 RV IC TX RX SHK 21 22 23 24 25 2-288 LRC VEE AGND VCC VRLY Preliminary Information Pin Description (continued) 26 27 28 LRD XLA XLD MH88636-4 Loop Relay Drive (Output). Connects to the Loop Relay coil. When LRC is at a logic 1 an open collector output at LRD sinks current and energizes the relay. Loop Relay Contact A. Connects to XLB through the Loop Relay (K1) contacts when the relay is activated. Loop Relay Contact D. Connects to XLC through the Loop Relay (K1) contacts when the relay is activated. termination across Tip and Ring. The device can be considered to be in an off-hook state and DC loop current will flow. The line termination consists of a DC resistance and an AC impedance. When LRC is at a logic 0, the Line Termination is removed from across Tip and Ring. An external Dummy Ringer should be permanently connected across Tip and Ring and under these conditions is the only load on the line. The device can be considered to be in an on-hook state and negligible DC current will flow. The Dummy Ringer is a series AC load of typically (17k+330nF) which represents a mechanical telephone ringer and allows ringing voltages to be sensed. This load can be considered negligible when the line has been terminated. Depending on the Network Protocol being used the line termination can seize the line for an outgoing call, terminate an incoming call, or if applied and disconnected at the correct rate can be used to generate dial pulse signals. The DC line termination circuitry provides the line with an active DC load which is equivalent to a DC resistance of less than 300, dependant upon the loop current. Functional Description The MH88636-4 is a Central Office Interface Circuit (COIC). It is used to correctly terminate a Central Office 2-Wire telephone line. The device provides a signalling link and a 2-4 Wire line interface between the telephone line and subscriber equipment. The subscriber equipment can include Private Branch Exchanges (PBX's), Key Telephone Systems, Terminal Equipment, Digital Loop Carriers and Wireless Local Loops. All descriptions assume that the device is connected as in the application circuit shown in Figure 3. Isolation Barrier The MH88636-4 provides an isolation barrier which is designed to meet FCC Part 68 (November 1987) Leakage Current Requirements. External Protection Circuit An external Protection Circuit assists in preventing damage to the device and the subscriber equipment, due to over-voltage conditions. The type of protection required is dependant upon the application and regulatorary standards. In Figure 3 the protection is shown in block form. Further details should be obtained from the specific country's regulatorary body. Ringing Equivalent Number The Ringing Equivalent Number (REN) is application specific. See the governing regulatory body specification for details. Suitable Markets The MH88636-4 has a selectable Input Impedance of 900 or 900 + 2.16F. This makes it suitable primarily for North America or Brazilian markets. AC Input Impedance The Input Impedance (Zin) is the AC impedance that the MH88636-4 places across Tip and Ring in order to terminate the telephone line. It can be set to either 900 or 900 + 2.16uF by connecting an external impedance between XLA and XLD (Zext). To select a 900 Input Impedance, 1000 must be connected across XLA and XLD. Line Termination When LRC is at a logic 1, LRD will sink current which energizes the Loop Relay (K1), connecting XLA to XLB and XLC to XLD. This places a line 2-289 MH88636-4 To select a 900 + 2.16F Input Impedance, 1000 + 360//2.2uF must be connected across XLA and XLD. All connections should be kept as short as possible. Preliminary Information system controller. The supervisory circuitry is capable of detecting: Ringing Voltage; Forward and Reverse loop battery; Forward and Reverse loop current; and Switch Hook. * Ringing Voltage Detect Output (RV) The RV output provides a logic 0 when ringing voltage is detected across Tip and Ring. It toggles at the ringing frequency, typically going low 50ms after the ringing voltage is applied and remains low for 50 ms after ringing voltage is removed. * Forward Loop and Reverse Loop Detect Outputs (FL & RL) The FL output provides a logic 0 when either forward loop battery or forward loop current is detected, that is the Ring pin voltage is negative with respect to Tip pin voltage. The RL output provides a logic 0 when either reverse loop battery or reverse loop current is detected, that is the Tip pin voltage is negative with respect to Ring pin voltage. * The Switch Hook Detect (SHK) The SHK output is active if either forward loop or reverse loop current is detected, or if forward or reverse battery voltage is detected. Control InputS Network Balance Impedance The MH88636-4's Network Balance Impedance has been optimised for either of the two Input Impedances. 2-4 Wire Conversion The device converts the balanced 2-Wire input, presented by the line at Tip and Ring, to a ground referenced signal at TX. This circuit operates with or without loop current; signal reception with no loop current is required for on-hook reception enabling the detection of Caller Line Identification (CLI) signals. Conversely the device converts the ground referenced signal input at RX, to a balanced 2-Wire signal across Tip and Ring. The 4-Wire side (TX and RX) can be interfaced to a filter/codec, such as the Mitel MT896X, for use in digital voice switched systems 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 RX, being sent to the line, must not appear at the output TX. In order to prevent this, the device has an internal cancellation circuit. The measure of attenuation is Transhybrid Loss (THL). Transmit and Receive Gain The Transmit Gain of the device is the gain from the balanced signal across Tip and Ring to the ground referenced signal at TX. It is set at 0dB. The Receive Gain of the device is the gain from the ground referenced signal at RX to the balanced signal across Tip and Ring. It is set at -2dB. The MH88636-4 accepts a control signal from the system controller at the Loop Relay Control input (LRC). This energises the relay drive output Loop Relay Drive (LRD). The output is active low and has an internal clamp diode to VRLY. The intended use of this relay driver is to add and remove the Line Termination from across Tip and Ring, as shown in Figure 3. If this Control input and the Supervisory Features are used as indicated in Figure 3, Loop-Start Signalling can be implemented. Mechanical Data See Figure 9 and 10 for details of the mechanical specification. Supervision Features Line Status Detection Outputs The MH88636-4 supervisory circuitry provides the signalling status outputs which are monitored by the 2-290 Preliminary Information MH88636-4 MH88636-4 +5V 4 Tip Protection Circuit Ring +5V Dummy Ringer TIP VCC 24 C1 5 RING 17 TX K1 26 25 21 K1 LRD RX VRLY LRC RV 1 27 K1 XLB XLA FL RL SHK Analog Out 18 Analog In Loop Relay Control 14 13 12 20 Ringing Detect Forward Loop Reverse Loop Switch Hook Zext 2 XLC 28 XLD NOTES: 1) K1 Electro Mechanical 2 Form A 2) Dummy Ringer is typically 17k + 330nF 3) C1 and C2 are decoupling capacitors AGND VEE 23 C2 22 -5V Figure 3 - Typical LS Application Circuit 2-291 MH88636-4 Absolute Maximum Ratings* Parameters 1 2 3 4 5 DC Supply Voltages DC Ring Relay Voltage Storage Temperature Ringing Voltage Ring Trip Current Sym VCC VEE VRLY TS Preliminary Information Min -0.3 0.3 -0.3 -55 Max 7 -7 18 +125 130 180 Units V V C Vrms mArms Comments VRING ITR 250ms 10% duty cycle or 500ms single shot * Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied. Recommended Operating Conditions Parameters 1 2 3 DC Supply Voltages DC Ring Relay Voltage Operating Temperature Symbol VCC VEE VRLY TOP Min 4.75 -4.75 -40 0 Typ 5.0 -5.0 5.0 25 25 Max 5.25 -5.25 15 85 70 Units V V V C C Comments Industrial range MH88636AD-4I Commercial range MH88636A*-4 Typical figures are at 25C with nominally 5V supplies and are for design use only. DC Electrical Characteristics Characteristics 1 2 3 FL RL SHK RV LRD LRC LRC Sym ICC IEE PC VOL VOH IOL ICD VIL VIH IIH IIL Min Typ 4 3 35 Max 13 13 137 0.5 5.25 Units mA mA mW V V mA mA V V A A Test Conditions Supply Current Power Consumption Low Level Output Voltage High Level Output Voltage Sink Current, Relay to VCC Clamp Diode Current Low Level Input Voltage High Level Input Voltage High Level Input Current Low Level Input Current -0.3 2.4 100 150 IOL = 4mA IOH = 0.4mA VOL = 0.35V 4 5 6 0.8 2.0 40 40 VIH = 5.0V Electrical Characteristics are over recommended operating conditions unless otherwise stated. Typical figures are at 25C with nominally 5V supplies and are for design use only. 2-292 Preliminary Information Loop Electrical Characteristics Characteristics 1 2 3 4 5 6 Ringing Voltage Ringing Frequency Operating Loop Current Off-Hook DC Resistance Leakage Current (Tip-Ring to AGND) SHK & FL Threshold Tip-Ring (On-hook) Tip-Ring Current (Off-Hook) SHK & RL Threshold Tip-Ring (On-Hook) Tip-Ring Current (Off-Hook) Symbol RV Min 20 16 16 260 Typ Max 110 68 70 300 320 7 Units Vrms Hz mA mArms MH88636-4 Test Conditions @ 20mA @ 16mA @ 1000VAC 14 5 -14 -5 20 15 -20 -15 Vdc mA Vdc mA LRC = 0V LRC= 5V LRC= 0V LRC = 5V 7 Electrical Characteristics are over recommended operating conditions unless otherwise stated . Typical figures are at 25C with nominal 5V supplies and are for design aid only. 2-293 MH88636-4 AC Electrical Characteristics Characteristics 1 2 2-wire Input Impedance Return Loss at 2-wire RL 3 Longitudinal to Metallic Balance 20 30 Symbol Zin Min Typ 900 Max Preliminary Information Units Test Conditions Programmed with ZEXT=1k Test circuit as Fig 6 200-3400 Hz Zin = 900 Test circuit as Fig 7 200Hz 1000Hz 2000Hz 3000Hz-4000Hz Test circuit as Fig 8 200Hz - 1kHz 1kHz - 4kHz 200-4000Hz Test circuit as Fig 4 1000Hz 300Hz 3400Hz Test circuit as Fig 5 1000Hz 300Hz 3400Hz dB 58 58 53 51 60 40 20 -0.25 -0.15 -0.25 -2.25 -0.15 -0.25 0 0 0 -2 0 0 10 5 +0.25 +0.15 +0.15 -1.75 +0.15 +0.15 dB dB dB dB dB dB dB dB dB dB dB dB dB k dBm dBm 0.1 0.1 1.0 1.0 % % 4 Metallic to Longitudinal Balance Transhybrid Loss Gain (voltage) 2 wire to TX Relative Gains THL 5 6 7 Gain (voltage) RX to 2 wire Relative Gains 8 9 10 Input impedance at RX Output impedance at TX Signal Overload Level at 2-wire at TX Total Harmonic Distortion at 2-wire at TX Idle Channel Noise at 2-Wire at TX Power Supply Rejection Ratio at 2-wire and TX VCC VEE CMRR THD 3.0 0 % THD < 5% Ref 900 @ 20mA 11 Input 0.5V, 1kHz @ Rx Input 0.5V, 1kHz @ Tip-Ring 12 NC 11 13 PSRR 25 25 50 40 -1 0 1 dB dB dB dB dB 16 16 dBrnC dBrnC Ripple 0.1V, 1kHz 13 14 15 On-Hook Gain, 2-Wire to TX Relative to Off-Hook Gain Test circuit as Fig 7 50Hz - 200Hz 200Hz - 4kHz Input 1000Hz @ 0.5V Electrical Characteristics are over recommended operating conditions unless otherwise stated . Typical figures are at 25C with nominal 5V supplies and are for design aid only. 2-294 Preliminary Information MH88636-4 -V +5V -5V 10H 300 VCC XLA XLB XLC XLD 17k RING I = 25mA + VEE 100uF ~ + Vs = 0.5V 600 330nF 100uF TX RX AGND 10H 300 TIP Gain = 20 * Log (Vtx/Vs) Figure 4 - 2-4 Wire Gain Test Circuit +5V -5V -V VCC XLA XLB XLC XLD VEE I = 25mA RING 10H 300 100uF + 17k Z = 600 330nF TX RX Vs = 0.5V TIP AGND 10H 300 100uF + ~ Gain = 20 * Log (Vz/Vs) Figure 5 - 4-2 Wire Gain Test Circuit 2-295 MH88636-4 -V Preliminary Information +5V -5V 10H 300 VCC XLA XLB XLC XLD 17k V1 368 330nF TX RX AGND 10H 300 Return Loss = 20 * Log (V1\Vs) TIP 100uF + I = 25mA RING 100uF + 368 Vs = 0.5V 600 VEE ~ Figure 6 - Return Loss Test Circuit +5V -5V -V VCC XLA XLB XLC XLD VEE 10H 300 100uF RING I = 25mA + 368 17k V1 Vs = 0.5V 330nF 368 100uF TIP + 10H 300 TX RX AGND ~ Long to Met Bal. = 20 * Log (V1\Vs) CMRR = 20 * Log (Vtx\Vs) - (2-4W Gain) Figure 7 - Longitudinal to Metallic Balance and CMRR Test Circuit 2-296 Preliminary Information MH88636-4 -5V -V +5V VCC XLA XLB XLC XLD VEE 10H 300 100uF RING I = 25mA + 368 Vs = 0.5V 17k 510 330nF V1 100uF TIP + 10H 300 368 ~ TX RX AGND Met to Long Bal. = 20 * Log (V1\Vs) Figure 8 - Metallic to Longitudinal Balance Test Circuit 0.26 Max (6.6 Max) 0.260 +0.015 (6.6 +0.4) 0.08 Typ (2 Typ) 0.90 Typ* (22.9 Typ) 0.95 Max (24.2 Max) * 0.100 +0.010 (2.54 +0.25) 0.020 +0.005 (0.5 +0.12) *0.05 Typ (1.27 Typ) 1.42 Max (36.1 Max) Notes: 1) Not to scale 2) Dimensions in inches. (Dimensions in millimetres) 3) Pin tolerances are non-accumulative. 4) Recommended soldering conditions: Max wave solkder temp: 260C for 10 secs. * Dimensions to centre of pin. 1 Figure 9 - DIL Package Mechanical Data 2-297 MH88636-4 Preliminary Information 0.32 Max (8.13 Max) 0.89 Typ (22.6 Typ) 0.125 +0.015 (3.18 +0.38) * 0.100 +0.010 (2.54 +0.25) 0.020 +0.005 (0.51 +0.13) *0.05 Typ (1.27 Typ) 0.060 Typ (1.52 Typ) Notes: 1) Not to scale 2) Dimensions in inches. (Dimensions in millimetres) 3) Pin tolerances are non-accumulative. 4) Recommended soldering conditions: Max reflow temp: 235C for 10 secs. * Dimensions to centre of pin. 1.42 Max (36.1 Max) 1.01 Typ (29.5 Max) 1 Figure 10 - SMT Package Mechanical Data 0.10 (2.54) 0.10 (2.54) Notes: 1) Not to scale 2) Dimensions in inches. (Dimensions in millimetres) 3) All dimensions are Typical 0.89 (22.6) 0.04 (1.02) 0.06 (1.52) Figure 11 - SMT Footprint 2-298 For more information about all Zarlink products visit our Web Site at www.zarlink.com Information relating to products and services furnished herein by Zarlink Semiconductor Inc. trading as Zarlink Semiconductor or its subsidiaries (collectively "Zarlink") is believed to be reliable. However, Zarlink 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 Zarlink or licensed from third parties by Zarlink, whatsoever. Purchasers of products are also hereby notified that the use of product in certain ways or in combination with Zarlink, or non-Zarlink furnished goods or services may infringe patents or other intellectual property rights owned by Zarlink. This publication is issued to provide information only and (unless agreed by Zarlink 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 Zarlink 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 Zarlink's conditions of sale which are available on request. Purchase of Zarlink's I2C components conveys a licence under the Philips I2C Patent rights to use these components in an I2C System, provided that the system conforms to the I2C Standard Specification as defined by Philips. Zarlink and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc. Copyright 2002, Zarlink Semiconductor Inc. All Rights Reserved. TECHNICAL DOCUMENTATION - NOT FOR RESALE |
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