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| MH88422 Data Access Arrangement Preliminary Information Features * * * * * * * * * * FAX and Modem interface (V29) Variants available with different line impedances Provides reinforced barrier to international PTT requirements Transformerless 2-4 Wire conversion. Integral Loop Switch Dial Pulse and DTMF operation Line state detection outputs Loop current/ringing outputs Single +5V operation, low on-hook power (5mW) Full duplex data transmission DS5067 ISSUE 10 November 1998 Ordering Informations MH88422-1/2/3 MH88422BD-1 26 Pin DIL Package 26 Pin DIL Package 0C to 70C Description The Mitel MH88422 Data Access Arrangement (D.A.A.) provides a complete interface between data transmission equipment and a telephone line. All functions are integrated into a single thick film hybrid module which provides high voltage isolation, very high reliability and optimum circuit design needing a minimum of external components. A number of variants are available to meet particular country impedance requirements. The D.A.A. has been designed to meet regulatory approvals requirements in these countries. Applications Interface to Central Office or PABX line for: * * * Modem FAX Telemetry Isolation Barrier VDD AGND OptoIsolation OptoIsolation TXIN TF RLS OptoIsolation OptoIsolation Logic Input Buffer Audio Buffer Audio Buffer Ring & Loop Buffer Transhybrid loss cancellation circuit TIP RING Input Buffer & Line Termination LC VR VX RVLC Network Connections User Connections Figure 1 - Functional Block Diagram 2-13 MH88422 Preliminary Information VDD IC AGND IC LC IC RVLC IC IC IC/NP VX IC/NP VR 1 2 3 4 5 6 7 8 9 10 11 12 13 26 25 24 23 22 21 20 19 18 17 16 15 14 TIP IC RLS IC/NP IC IC/NP TF NP TXIN IC RING NP IC Figure 2 - Pin Connections Pin Description Pin # 1 2, 4, 6, 8, 9 3 5 7 10, 12 11 13 14, 17 15, 19 16 18 20 21, 23 24 25 26 Name VDD IC AGND LC RVLC IC/NP VX VR IC NP RING TXIN TF IC/NP RLS IC TIP Positive Supply Voltage. +5V. Internal Connection. This pin is cropped short. Analog Ground. 4-Wire Ground. Normally connected to System Ground. Loop Control (Input). A logic 0 activates internal circuitry which provides a line termination across Tip and Ring. Used for seizing the line and dial pulsing. Ringing Voltage and Current Detect (Output). Indicates the status of loop current and ringing voltage. Internal Connection or No Pin Fitted. This pin is either cropped short or not fitted, depending on the variant. See Note 1 Transmit (Output). Analog output to modem/fax chip set. Receive (Input). Analog input to modem/fax chip set. Internal Connection. This pin is cropped short. No Pin Fitted. Ring Lead. Connects to the "Ring" lead of a telephone line. Dummy Ringer Connection. Connects to the "Ring" lead of a telephone line through a dummy ringer capacitor. Tip Feed. Connects externally to the RLS pin. Internal Connection or No Pin Fitted. This pin is either cropped short or not fitted, depending on the variant. See Note 1 Ringing Loop Sense. Connects externally to the TF pin. Internal Connection. This pin is cropped short. Tip Lead. Connects to the "Tip" lead of a telephone line. Description Notes: 1. Variant 1, 4 BD-1 - pins 10,12, & 21 are cropped short. Pin 23 is not fitted. 2. Variant 2 - pin 23 is cropped short. Pins 10, 12 & 21 are not fitted. 3. Variant 3 - pins 12 and 21 are cropped short. Pins 10 and 23 are not fitted. 2-14 Preliminary Information Functional Description The device is a Data Access Arrangement (D.A.A.). It is used to correctly terminate a 2-Wire analog loop. It provides a signalling link and a 2-4 Wire line interface between an analog loop and the subscriber's data transmission equipment such as Modems, Facsimiles (Fax's), Remote Metering and Electronic Point of Sale equipment (EPOS). MH88422 Input Impedance The MH88422 is available in a number of different variants each of which has its own fixed Tip-Ring AC input impedance (Zin). Each variant is identified by the final digit in its part number, as listed below. Also shown are the countries whose PTT requirements match these impedances. MH88422-1 Zin = 220 + 820 // 120nF Australia / South Africa / Spain MH88422BD-1 Zin = 220 + 820 // 115nF German BABT ZV5 MH88422-2 North America Zin = 600 Isolation Barrier The device provides an isolation barrier implemented by using optocouplers. This is a reinforced barrier for an instantaneous power surge of up to 3kV r.m.s., for example a lightning strike. It also provides full isolation for a continuous AC voltage level of up to 250V r.m.s. External Protection Circuit Should the input voltage from the line exceed that isolated by the optocoupler, an External Protection Circuit assists in preventing damage to the device and the subscriber equipment. See Figure 3. MH88422-3 Zin = 370 + 620 // 310nF UK / New Zealand Many of these countries now pass equipment approved to CTR21. The MH88422 will not meet this specification. See the MH88437 datasheet for a CTR21 Product. Line Termination When Loop Control (LC) is at a logic 0, a line termination is applied across Tip and Ring. The device can be considered off-hook and DC loop current will flow. The line termination consists of both a DC line termination and an AC input impedance. When LC is at a logic 1, a Dummy Ringer is applied across Tip and Ring. The device can be considered on-hook and negligible DC current will flow. The dummy ringer is an AC load, which represents a telephone's mechanical ringer. Dummy Ringer This device supports a dummy ringer option which can be configured by the inclusion of external components. Further details relating to component values and configuration can be obtained from MSAN-154. For example, Figure 3 shows capacitor C2 which if set to 1.8F would meet the New Zealand dummy ringer requirements. 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 VX, as required by modem/fax chip sets. Conversely the device converts the ground referenced signal input at VR, to a balanced 2-Wire signal across Tip and Ring. 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 VR, being sent to the line, must not appear at the output VX. In order to prevent this, DC Line Termination When LC is at a logic 0, an active termination is applied across Tip and Ring, at which time it can be considered to be in an off-hook state. This is used to terminate an incoming call, seize the line for an outgoing call, or if it is applied and disconnected at the required rate, can be used to generate dial pulses. This termination resembles approximately 300 resistance, which is loop current dependent. 2-15 MH88422 the device has an internal cancellation circuit. The measure of attenuation is Transhybrid Loss (THL). The Transmit (VX) and Receive (VR) signals are ground referenced (AGND), and biased to 2.5V. The device must be in the off-hook condition for transmission or reception to take place. Preliminary Information Characteristics table. For the correct gain, the Input Impedance of the MH88422 variant used, must match the specified line impedance. The input impedance to ground of VR is 47k and this can be used with an external series resistor to form a potential divider and reduce the overall gain in the application. Example: If R3 = 100k, in Figure 3, the Gain would reduce by 3.0dB. Transmit Gain The Transmit Gain of the MH88422 is the gain from the differential signal across Tip and Ring to the ground referenced signal at VX. The internal Transmit Gain of the device is fixed and depends on the variant as shown in the AC Electrical Characteristics table. For the correct gain, the Input Impedance of the MH88422 variant used, must match the specified line impedance. By adding an external potential divider to VX, it is possible to reduce the overall gain in the application. The output impedance of VX is approximately 10 and the minimum resistance from VX to ground should be 2k. Example: If R1 = R2 = 2k, in Figure 3, the gain would reduce by 6.0dB. Supervisory Features The device is capable of monitoring the line conditions across Tip and Ring, this is shown in Figure 3. The Ringing Voltage Loop Current detect pin (RVLC), indicates the status of the device. The RVLC output is at logic 0 when loop current flows, indicating that the MH88422 is in an off hook state. When the device is generating dial pulses, the RVLC pin outputs a TTL pulse at the same rate. An AC ringing voltage across Tip and Ring will cause RVLC to output a TTL pulse at double the ringing frequency with an envelope determined by the ringing cadence. Receive Gain The Receive Gain of the MH88422 is the gain from the ground referenced signal at VR to the differential signal across Tip and Ring. The internal Receive Gain of the device is fixed as shown in the AC Electrical Mechanical Data See Figure 10, for details of the mechanical specification. MH88422 R2 TIP 26 24 Protection Circuit C2 20 18 16 TIP RLS VR TF RVLC TXIN 5 LC VDD 1 AGND 3 7 Ring Voltage & Loop Current Detect Output 11 VX R3 R1 C3 Audio Output Audio Input 13 C4 RING RING Loop Control Input Notes: 1) R1, R2: Transmit Gain Resistors 2) R3: Receive Gain Resistor C1 3) C1: 10F 6V Tantalum 4) C2: Dummy Ringer Capacitor 250V 5) C3, C4: 10F AC coupling Capacitors + +5V Figure 3 - Typical Application Circuit 2-16 Preliminary Information Absolute Maximum Ratings* - All voltages are with respect to AGND unless otherwise specified. Parameter 1 2 3 4 5 DC Supply Voltage Storage Temperature DC Loop Voltage Ringing Voltage Loop Current - 2 variant - all other variants Symbol VDD TS VBAT VR VR ILoop Min -0.3 -55 -110 -2 - MH88422 . Max 6 +125 +110 150 120 90 Units V C V Vrms Vrms mA *Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied. Recommended Operating Conditions Parameter 1 2 DC Supply Voltages Operating Temperatures Sym VDD TOP Min 4.75 0 Typ 5.0 25 Max 5.25 70 90 Units V Test Conditions C Vrms 150 Vrms for -2 variant 3 Ringing Voltage VR 75 Typical figures are at 25C with nominal +5V supply and are for design aid only Loop Electrical Characteristics Characteristics 1 Ringing Voltage -1 Variant Only No Detect Detect No Detect Detect No Detect Detect Sym VR 17 35 15 32 7 14 23 15 20 15 6.0 28.8 -2 Variant 2.4 3.1 -3 Variant 6.0 BD-1 Variant 6.0 6.0 6.0 6.0 7.8 9.0 14.0 10.8 27 28 68 80 80 Vrms Vrms Vrms Vrms Vrms Vrms Hz Hz mA mA V V V V V V V V V Test circuit as Fig 4 ILoop=19mA (See Note 1) ILoop=60mA ILoop=15mA ILoop=20mA (See Note 2) ILoop=26mA ILoop=15mA (See Note 3) ILoop=90mA ILoop=20mA (See Note 4) ILoop=50mA Min Typ Max Units Test Conditions Externally Adjustable See MSAN-154 BD-1 Variant Only All other Variants 2 Ringing Frequency BD-1 Variant Only All other Variants Operating Loop Current BD-1 Variant Only All other Variants Off-Hook DC Voltage -1 Variant 3 4 2-17 MH88422 Loop Electrical Characteristics (continued) 5 6 7 Leakage Current (Tip or Ring to AGND) Leakage Current on-hook (Tip to Ring) DC Resistance during dialling -1 Variant All other Variants Dial Pulse Distortion BD-1 Variant ON OFF All other Variants ON OFF 0 0 0 0 9 10 10 A Preliminary Information 100V DC VBAT = -50V 200 260 +1 +1 +2 +2 220 280 +2 +2 +4 +4 ms ms ms ms ILoop = 20 - 40 mA 8 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. Note 1: Refer to FTZ 1TR2 section 2.2 Note 2: Refer to EIA/TIA 464 section 4.1.1.4.4 Note 3: Refer to BS6305 section 4.3.1 Note 4: Refer to ZV5 Annex 1 DC Electrical Characteristics Characteristics 1 2 3 RVLC LC Supply Current Low Level Output Voltage High Level Output Voltage Low Level Input Voltage High Level Input Voltage Low Level Input Current High Level Input Current Sym IDD VOL VOH VIL VIH IIL IIH 2.4 0.8 2.0 Min Typ 1 Max 5 0.4 Units mA V V V V A A Test Conditions VDD = 5.0V, On-hook IOL = 4mA IOH = 0.4mA -60 60 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. VIL = 0.0V VIH = 5.0V 2-18 Preliminary Information AC Electrical Characteristics - MH88422 All Variants Characteristics 1 2 3 4 Input Impedance VR Output Impedance at VX Receive Gain (VR to 2-Wire) Frequency Response Gain (relative to Gain @ 1kHz) All Variants 5 Signal Output Overload Level at 2-Wire at Vx Total Harmonic Distortion BD-1 Variant at 2-Wire All other Variants at 2-Wire All Variants at VX Power Supply Rejection Ratio BD-1 Variant at 2-Wire at VX All other Variants 8 Transhybrid Loss at 2-Wire at VX THL THD 1.2 1.2 1.2 PSRR 18 18 12 12 6 40 40 20 20 20 dB dB dB dB dB 2.0 2.5 2.0 % % % -1 -1 +2.0 +2.0 0 0 +3.0 +3.0 +1 +1 dB dB dBm dBm 2.5 Sym Min Typ 47k 10 3.5 4.6 Max Units MH88422 Test Conditions dB Test circuit as Fig 6 Input 0.5V at 1kHz 300Hz 3400Hz THD < 5% @ 1kHz ILoop = 20 to 40mA Input -3.5dBm at 1kHz 6 7 Ripple 0.1Vrms 1kHz on VDD Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated. Typical figures are at 25C with nominal +5V and are for design aid only. Note 1: All of the above test conditions use a test source impedance which matches the device's impedance. Note 2: dBm is referenced to 600 unless otherwise stated. Test circuit as Fig 6 Input -3.5dBm, 300-3400Hz at VR 2-19 MH88422 AC Electrical Characteristics - MH88422-1 Characteristics 1 Return Loss at 2-Wire (220 + 820 //120nF) Sym RL Preliminary Information Min 20 20 20 40 55 53 Typ 22 24 26 65 60 60 -79 -73 Max Units dB dB dB dB dB dB Test Conditions Test circuit as Fig 7 300-500Hz 500-2500Hz 2500-3400Hz Test circuit as Fig 8 50-300Hz 300-1000Hz 1000-4000Hz 2 Longitudinal to Metallic Balance 3 Idle Channel Noise at 2-Wire at VX Nc -72 -58 0.9 0.4 0.9 dBmp dBmp dB dB dB Test circuit as Fig 5 Input 0.5V @ 1kHz Off -Hook 300Hz 3400Hz 4 Transmit Gain (2-Wire to Vx) -1.4 -0.4 -0.6 -0.5 5 Frequency Response Gain (relative to Gain @ 1kHz) -1.6 -2.1 Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated. Typical figures are at 25C with nominal +5V and are for design aid only Note 1: All of the above test conditions use a test source impedance which matches the device's impedance. AC Electrical Characteristics - MH88422-2 Characteristics 1 Return Loss at 2-Wire (Reference 600) Longitudinal to Metallic Balance 58 53 Metallic to Longitudinal Balance 60 40 3 Idle Channel Noise at 2-Wire at VX 4 Transmit Gain (2-Wire to Vx) -1.4 5 Frequency Response Gain (relative to Gain @ 1kHz) -1.6 -2.1 -0.4 -1.3 -0.5 0.9 0.4 0.9 dB dB dB Nc 13 13 20 20 dBrnC dBrnC Test circuit as Fig 5 Input 0.5V @ 1kHz Off- Hook 200Hz 3400Hz dB dB 60 55 dB dB Sym ERL Min 20 14 Typ 30 19 Max Units dB dB Test Conditions Test circuit as Fig 7 500-2500Hz 200-3200Hz Test circuit as Fig 8 200-1000Hz 1000-3000Hz Test circuit as Fig 9 200-1000Hz 1000-4000Hz SFRL 2 Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated. Typical figures are at 25C with nominal +5V supply and are for design aid only Note 1: All of the above test conditions use a test source impedance which matches the device's impedance. 2-20 Preliminary Information AC Electrical Characteristics - MH88422-3 Characteristics 1 2 3 Return Loss at 2-Wire (370 + 620 // 310nF) Longitudinal to Metallic Balance 50 Idle Channel Noise at 2-Wire at VX 4 Transmit Gain (2-Wire to Vx) -1.4 5 Frequency Gain (relative to gain @ 1kHz) -1.6 -2.1 -0.4 -1.3 -0.5 0.9 0.4 0.9 dB dB dB Nc -80 -80 -70 -68 dBmp dBmp 60 dB Sym RL MH88422 Min 16 Typ 20 Max Units dB Test Conditions Test circuit as Fig 7 200-4000Hz Test circuit as Fig 8 300-3400Hz Test circuit as Fig 5 Input 0.5V @ 1kHz Off-Hook 300Hz 3400Hz AC Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated. Typical figures are at 25C with nominal +5V and are for design aid only. Note 1: All of the above test conditions use a test source impedance which matches the device's impedance. AC Electrical Characteristics - MH88422BD-1 Characteristics 1 Return Loss at 2-Wire (220 + 820 // 115nF) Sym RL Min 16 Typ 22 Max Units dB Test Conditions Test circuit as Fig 7 300-3400Hz Ref ZV5 Sec 2.5.2 and 2.8.3 Test circuit as Fig 8 50-300Hz 300-600Hz 600-4000Hz Ref ZV5 Sec 2.8.2 2 Longitudinal to Metallic Balance 30 40 46 65 60 60 dB dB dB 3 Idle Channel Noise at 2-Wire at VX Nc -84 -75 -1.4 -0.4 -1.3 -0.5 -70 -70 0.9 -0.4 0 dBmp dBmp dB dB dB Test circuit as Fig 5 Input 0.5V @ 1kHz Off-Hook 300Hz 3400Hz 4 Transmit Gain (2-Wire to Vx) 5 Frequency Gain (relative to gain @ 1kHz) -1.6 -1.2 AC Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated. Typical figures are at 25C with nominal +5V and are for design aid only. Note 1: All of the above test conditions use a test source impedance which matches the device's impedance. 2-21 MH88422 Preliminary Information +5V DUT 1 3 5 7 9 11 1uF 13 VDD AGND LC/ RVLC/ IC VX VR TIP RLS 26 24 ILoop IC 22 TF 20 470nF TXIN 18 RING 16 NC 14 Figure 4 - Test Circuit 1 -V +5v DUT 1 3 5 VDD AGND LC/ TIP RLS IC 26 24 22 I=20mA + 10H 500 100uF 9 RVLC/ 9 NC TF 20 470nF TXIN 20 RING 16 IC 14 100uF + 10H 500 Vs Impedance = Zin 11 VX 1uF 13 VR V Gain = 20 * Log (VX / Vs) Figure 5 - Test Circuit 2 2-22 Preliminary Information -V +5v DUT 1 3 VDD AGND TIP RLS IC 26 24 22 V (Zin) 470nF TXIN 18 RING 16 NC 14 100uF + 10H 500 Zin I=20mA 10H 500 100uF + MH88422 5 LC/ 7 RVLC/ 9 NC TF 20 11 VX 1uF 13 Vs Gain = 20 * Log (V(Zin) / Vs) VR Figure 6 - Test Circuit 3 -V 10H 500 +5v DUT 1 3 VDD AGND TIP RLS IC 26 24 300 22 V1 Vs 470nF 9 IC TXIN 18 RING 16 IC 14 10H 500 + 100uF 300 I=20mA 100uF Zin + 5 LC/ 7 RVLC/ TF 20 11 VX 1uF 13 VR Return Loss = 20 x Log (V1 / Vs) Figure 7 - Test Circuit 4 2-23 MH88422 -V +5v DUT 1 3 5 VDD AGND LC/ TIP RLS IC 26 24 22 I=20mA 10H 500 Preliminary Information 100uF + 300 V1 7 RVLC/ 9 IC TF 20 470nF TXIN 18 100uF + IC 14 10H 500 300 Vs 11 VX 1uF 13 VR RING 16 Long. to Met. Balance = 20 * Log (V1 / Vs) Figure 8 - Test Circuit 5 -V +5v DUT 1 3 5 VDD AGND LC/ TIP RLS IC 26 24 300 22 Vs 470nF 9 IC TXIN 18 100uF + 10H 500 300 510 V1 I=20mA 100uF + 10H 500 7 RVLC/ TF 20 11 VX 1uF 13 VR RING 16 IC 14 Met. to Long. Balance = 20 * Log (V1 / Vs) Figure 9 - Test Circuit 6 2-24 Preliminary Information MH88422 0.19 Max (4.8 Max) 0.27 Max (6.9 Max) 0.08 Typ (2 Typ) 0.90 Typ * (22.9 Typ) 0.95 Max (24.2 Max) * 0.20+0.01 (5.08+0.25) 0.020 + 0.005 (0.5 + 0.12) * 0.10 Typ (2.54 Typ) 0.063 Max (1.6 Max) 0.26+0.015 (6.6+0.4) 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: Wave soldering - Max temp at pins 260C for 10 secs. * Dimensions to centre of pin. 5) Short-cropped pins differ between variants. (see pin description) 1 & BD-1 variant short. 1 Figure 10 - Mechanical Data for 26-Pin DIL Hybrid 2-25 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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