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MH88524 Dual 2-4 Wire Circuit Preliminary Information Features * * * * * * Full duplex operation Two complete circuits per package Transformerless 2-4 Wire (4-2 Wire) conversion + 5V operation Wide bandwidth (50kHz) Small Package Size MH88524 ISSUE 4 April 1995 Ordering Information 10 Pin SIL Package 0C to 70C Description The Zarlink MH88524 (Dual 2-4 wire Circuit) provides two independent interfaces between4-Wire devices such as the MH88631 COIC (Central Office Interface CIrcuit) and a speech switch such as the MT8814 (Analog Switch Array), requiring only a single bidirectional switch per crosspoint. The MH88524 can accommodate two full duplex audio links. The device is fabricated as a thick film hybrid which incorporates various technologies for optimum circuit design and very high reliability. Applications 4-2 Wire and 2-4 Wire conversion for: * * * * * * * * * MH88630/631, MH88632, MH88500 & MT8840 PBX Key Telephone System Channel bank Voice Mail Terminal Equipment Digital Loop Carrier Modem Intercom RX1 Receive Gain Circuit1 2-4 Wire Circuit 1 JUN1 TX1 Transmit Gain Circuit 1 RX2 Receive Gain Circuit 2 2-4 Wire Circuit 2 JUN2 TX2 Transmit Gain Circuit 2 VDD VEE AGND FIgure 1 - Functional Block Diagram 1 MH88524 Preliminary Information RX1 JUN1 TX1 VDD AGND VEE IC TX2 JUN2 RX2 1 2 3 4 5 6 7 8 9 10 Figure 2 - Pin Connections Pin Description Pin # 1 2 3 4 5 6 7 8 9 10 Name RX1 JUN1 TX1 VDD AGND VEE IC TX2 JUN2 RX2 Description Receive 1 (Input). 4-Wire ground (AGND) referenced audio output. Junctor 1 (Transmit and Receive). Ground referenced transmit and receive speech path. Transmit 1. 4-Wire ground (AGND) referenced audio output. Positive Supply Voltage. Typically +5V. Analog Ground. 2-Wire and 4-Wire ground. Normally connected to System Ground. Negative Supply Voltage. Typically -5V. Internal Connection. This pin is internally connected. Transmit 2 (Output). 4-Wire ground AGND) referenced audio output. Junctor 2 (Transmit and Receive). Ground referenced transmit and receive speech path. Receive 2 (Input). 4-Wire ground (AGND) referenced audio output. Absolute Maximum Ratings* Parameter 1 2 DC Supply Voltage Storage Temperature Sym VDD VEE TS Min -0.3 +0.3 -55 Max 15 -15 125 Units V V C Comments With respect LGND * Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied. Recommended Operating Conditions Parameter 1 2 DC Supply Voltage Operating Temperature Sym VDD VEE TOP Typ* 5.0 -5.0 Min 4.75 -4.75 0 Max 10 -10 70 Units V V C Comments * Typical figures are at 25 C with nominal +5V supplies and are for design aid only. 2 Preliminary Information DC Electrical Characteristics Characteristics 1 2 Supply Current Power Dissipation Sym IDD PEE PC Min Typ* Max 4 4 40 Units mA mW MH88524 Test Conditions VDD = +5.0 VEE = 5.0 VDD = +5.0 VEE = 5.0 DC 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. AC Electrical Interdependence Characteristics Characteristics 1 Cross, Circuit 1 or 2 JUN1 to JUN2 JUN1 to TX2 RX1 to JUN2 RX1 to TX2 JUN1 to JUN2 JUN1 to TX2 RX1 to JUN2 RX1 to TX2 2 Crosstalk, Circuit 1 or 2 JUN1 to JUN2 JUN1 to TX2 RX1 to JUN2 RX1 to TX2 JUN1 to JUN2 JUN1 to TX2 RX1 to JUN2 RX1 to TX2 80 80 80 80 60 60 60 60 dB dB dB dB dB dB dB dB 80 80 80 80 60 60 60 60 dB dB dB dB dB dB dB dB Input 1.0V 200Hz-3400Hz Sym Min Typ* Max Units Test Conditions Input 1.0V 200Hz-3400Hz 200Hz-50kHz 200Hz-50kHz 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. 3 MH88524 Preliminary Information AC Electrical Characteristics Characteristics 1 2 3 4 5 Return Loss at junctorx (Ref. = 604 ) Impedance at Junctor Transhybrid Lossy (Junctor - 754 ) Transhybrid Loss z (Frequency = 1kHz) Transhybrid Loss (Frequency = 50kHz) Input Impedance at RX Output Impedance at TX Gain RX to Junctor Frequency Response Gain (relative to gain at 1kHz) Gain junctor to TX Frequency Response Gain relative to gain at 1kHz Signal Output Overload Level at TX at Junctor Total Harmonic Distortion RX to Junctor Junctor to TX RX to Junctor Junctor to TX Idle Channel Noise at TX at Junctor 15 PSRR Power Supply Rejection Ratio at TX and Junctor 40 VDD VEE 40 Typical figure are at 25C with nominal +5V supplies and are for design aid only. THD 0.4 0.4 1.0 1.0 Nc 2 2 dBrnC dBrnC Reference: 600 Reference 754 Ripple 0.1V 1kHz dB dB % % % % AJT Sym Min 46 40 604 42 36 18 21 15 18 10k ARJ Typ* Max Units dB dB dB dB dB dB dB dB V/V dBV dB dB V/V dBV dB dB dBm dBm Test Conditions 200-3400Hz 200-50kHz 200-3400Hz 200-50kHz Junctor = 600 Junctor = 900 Junctor = 600 Junctor = 900 6 7 8 9 0.99 -0.1 -0.1 -0.1 0.99 -0.1 -0.1 -0.1 6.0 6.0 1.00 0.0 5 1.01 0.1 0.1 1.0 1.01 0.1 0.1 0.1 Input 0.5V 1kHz 200-3400Hz 200-50kHz Input 0.5V 1kHz 200-3400Hz 200Hz-50kHz %THD<5% Reference: 600 Reference: 754 Input 0.5V 1kHz 200-3400Hz 200-3400Hz 200-50kHz 200-50kHz 10 11 12 1.00 0 13 14 * AC Electrical Characteristics are over recommended operating conditions unless otherwise stated. Both of the 2-4 Wire circuits are tested. TX, RX and Junctor actually refer to TX1, RX1 and JUN1; and TX2, RX2 and JUN2. All of the above test conditions use 754 connected between Junctor and AGND, unless otherwise stated. All the above test conditions use 200Hz to 3400Hz unless otherwise stated. Notes: x RX is connected to AGND, see Figure 3. y See Figure 5. z See Figure 4. 4 Preliminary Information Functional Description The MH88524 is a Dual 2-4 Wire Circuit used to interface between ground reference 2-Wire circuitry and ground referenced 4-Wire circuitry. The device can accommodate two full duplex audio links. MH88524 Figure 6, shows, illustrates a typical connection between an Interface Circuit (MH88631) and the MH88524. Note how the return loss occurs when JUNi is terminated with 754 . Figure 8 illustrates a typical connection between two interface circuits (MH88631), through an MH88524 and two crosspoint switches. Optimum return loss occurs when JUNi is terminated with 754 . Since the JUNi input/output impedance is 604 , the MH88510 JUNC input/output impedance is 604 , and the crosspoint switches resistance are 75W + 75 , this configuration gives optimum return loss. Hybrid The 2-4 Wire hybrid circuit separates the ground reference full duplex signal at JUNi (where i=1 or 2) of the switched line into receive and transmit ground referenced signals the RXi (Receive) and TXi (Transmit). The hybrid also prevents the input signal at RXi from appearing at TXi. The degree to which the hybrid minimises the contribution to the RXi signal at the TXi output is specified as transhybrid loss. For maximising transhybrid loss, see the Transhybrid Loss section. The 4-Wire side can be interfaces to a COIC such as the MH88631 for use in analog voice switched systems; or a filter/codec, such as the Zarlink MT896X, for use in digital voice switched systems. The 2-wire side can be interfaces to a crosspoint switch such as the MT8816 or a junctor SLIC such as the MH88510 for use in analog voice switched systems. Transhybrid Loss THL = log (VRX/VTX) Transhybrid loss is maximised when the JUNi termination impedance is 754W. In addition, good transhybrid loss is indicated in Figure 4 and AC Electrical Characteristics. Fixed Transmit and Receive Gain Transmit Gain (JUNi to TXi, TXi/JUNi) and receive Gain (RXi to JUNi, JUNi/RXi) are both fixed at 0dBV providing the MH88524 JUNi impedance is 754 . Return Loss at Junctor The MH88524's Junctor impedance (Zin) is fixed at 604 nominal when RXi and TXi in a feedback loop as shown in Figure 6, the JUNi impedance will change, see Return Loss with Interface Circuit. Application with MT8840, MH88500 and MH88524 Figure 11 illustrates an application for the MH88524's wide bandwidth. The MT8840 requires a 2-4 Wire converter which has good transhybrid loss at 32kHz. Since the MH88524 operates to 50kHz, it is ideal for this application. In addition, if a SLIC (Subscriber Line Interface Circuit) is required, the MH88500 can also be used since it also has a 604 Junctor and a wide bandwidth. Mechanical Data See Figure 12. Return Loss with Interface Circuit To maximise return loss at Tip-Ring of the Interface Circuit, the termination impedance at Tip-Ring of the Interface Circuit (COIC or SLIC) should match the Interface Circuit's input impedance (600 , 900 or complex). However, with the inclusion of the MH88524, the interface circuit's input impedance is dependent on the JUNi termination resistance. For optimum return loss the JUNi should be terminated with 754 . 5 MH88524 RETURN LOSS Preliminary Information MH88524 JUN1 TX1 TYPICAL RETURN (dB) 0 LOSS Ref: 604 10 TX1 AGND 20 30 40 50 100 1000 10,000 Frequency (Hz) 100,000 Figure 3 - Return Loss at Junctor vs Frequency with MH88524 TRANSHYBRID LOSS MH88524 JUN1 JUNCTOR RESISTANCE TX1 10 20 TX1 AGND 30 40 TYPICAL 50 TRANSHYBRID LOSS (dB) 60 550 600 650 700 750 800 850 900 950 Frequency (Hz) Figure 4 - Transhybrid Loss vs Junctor Resistance with MH88524 0 MH88524 754 JUNCTOR RESISTANCE JUN1 TX1 10 20 TX1 AGND TYPICAL TRANSHYBRID LOSS (dB) 30 40 50 100 1000 10,000 100,000 Frequency (Hz) Figure 5 - Transhybrid Loss vs Frequency with MH88524 6 Preliminary Information MH88524 JUNCTOR RESISTANCE MH88524 JUN1 TX1 MH88631 RX1 TIP RETURN LOSS TX1 AGND TX1 RING FREQ = 1000Hz 10 20 30 40 TYPICAL RETURN LOSS (dB) 50 60 550 600 650 700 750 800 850 900 950 JUNCTOR RESISTANCE () Figure 6 - Return Loss vs Junctor Resistance with MH88631 and MH88524 1 RECEIVE 1 INPUT RX1 JUN1 TX1 2 3 TRANSMIT 1 OUTPUT JUNCTOR1 INPUT/OUPUT 10 RECEIVE 1 INPUT RX2 JUN2 9 JUNCTOR 2 INPUT/OUTPUT 8 TRANSMIT 2 OUTPUT TX2 VDD AGND VEE 4 5 6 +5V -5V Figure 7 - MH88524 Application Circuit 7 MH88524 Preliminary Information TO CO LINE TIP 1 T MH88631 VX MH88524 (1/2) RX1 JUN1 VR RING 1 R RECEIVE 1 INPUT TX1 AGND RX1 e.g. MT8804 MT8816 etc. TO CO LINE TIP 2 T MH88631 VX MH88524 (1/2) RX2 JUN2 VR TX2 Notes: See MH88631, MT8804 and MT8816 data sheets for device details. RING 2 R Figure 8 - Application Circuit with MH88631, Crosspoint Switch and MH88524 TO CO LINE TIP 1 T MH88631 VX MH88524 RX1 (1/2) JUN1 VR RING 1 R RECEIVE 1 INPUT TX1 AGND RX1 e.g MT8804 MT8816 etc. TO CO LINE TIP 2 T MH88510 JUNC Notes: See MH88631, MT8804 and MT8816 data sheets for device details. RING 2 R AGND Figure 9 - Application Circuit with MH88631, MH88510, Crosspoint Switch and MH88524 8 Preliminary Information MH88524 MH88524 VIN RX1 RX1 JUN1 TX1 754 RX2 JUN2 754 VOUT JUN2 TX2 VOUT TX2 VDD AGND VEE Notes 1) In addition to the above test circuit: Apply VIN JUN1 and measure VOUT TX2 and VOUT JUN1. Apply VIN JUN2 and measure VOUT TX1 and VOUT JUN1 Apply VIN RX2 and measure VOUT TX1 and VOUT JUN1. 2) All ground connections are star configured (i.e., single point ground). +5V -5V CT (Crosstalk) calculation Examples: CT = 20xlog (VIN RX1/VOUT JUN2) CT = 20xlog (VIN RX1/VOUT TX2) Figure 10 - Application Circuit for Crosstalk Test Analog Signal Input MH88524 Digital Data Input (2kHz max) MT8840 TX0 TXD1 RXD0 VSS RX1 RX1 TX1 JUN1 AGND 32kHz ASK plus Analog Input/Output Digital Data Output High Pass Filter MH88500 TIP JUNCTOR GND RING Analog Signal Output Low Pass Filter To Telephone Station Set Input/Output Notes: 1) See MT8840 data sheet for device details. 2) See MH88500 data sheet for device details. Note that this device is optional in this applications circuit. 3) High Pass Filter is typically 2nd order 15kHz 4) Low Pass Filter is typically 2nd order 4kHz Figure 11 - Application Circuit with MT8840, MH88500 and MH88524 9 MH88524 Preliminary Information Side View 0.080 Max (2.0 Max) 1.00 + 0.03 (25.4 + 0.0.08) 0.56+0.02 (14.2+0.5) 12 34 9 10 0.010 + 0.002 (0.25 + 0.05) 0.12 Max (3.1 Max) Notes: 1) Not to scale 2) Dimensions in inches). 3) (Dimensions in millimetres). *Dimensions to centre of pin & tolerance non accumulative. 0.05 + 0.01 (1.3 + 0.5) * 0.05 + 0.02 (1.3 + 0.05) 0.020 + 0.05 (0.51 + 0.13) * * 0.18+ 0.02 (4.6 + 0.5) 0.100 + 0.10 (2.54 + 0.13) Figure 12 - Mechanical Data 10 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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