MH88422 Data Access Arrangement Preliminary Information Features DS5067 ISSUE 10 November 1998 Ordering Informations • • • • • • • • • • 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 MH88422-1/2/3 MH88422BD-1 26 Pin DIL Package 26 Pin DIL Package 0°C to 70°C 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. Applications Interface to Central Office or PABX line for: • • • Modem FAX Telemetry 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. Isolation Barrier VDD AGND TIP RING Input Buffer & Line Termination TXIN OptoIsolation Logic Input Buffer LC OptoIsolation Audio Buffer VR OptoIsolation Audio Buffer OptoIsolation Ring & Loop Buffer TF RLS Network Connections Transhybrid loss cancellation circuit VX RVLC 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 # Name Description 1 VDD 2, 4, 6, 8, 9 IC 3 AGND 5 LC 7 RVLC Ringing Voltage and Current Detect (Output). Indicates the status of loop current and ringing voltage. 10, 12 IC/NP Internal Connection or No Pin Fitted. This pin is either cropped short or not fitted, depending on the variant. See Note 1 11 VX Transmit (Output). Analog output to modem/fax chip set. 13 VR Receive (Input). Analog input to modem/fax chip set. 14, 17 IC Internal Connection. This pin is cropped short. 15, 19 NP No Pin Fitted. 16 RING Ring Lead. Connects to the "Ring" lead of a telephone line. 18 TXIN Dummy Ringer Connection. Connects to the "Ring" lead of a telephone line through a dummy ringer capacitor. 20 TF 21, 23 IC/NP 24 RLS 25 IC Internal Connection. This pin is cropped short. 26 TIP Tip Lead. Connects to the "Tip" lead of a telephone line. 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. 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. 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 MH88422 Preliminary Information Functional Description Input Impedance 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). 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. 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. MH88422-1 Zin = 220Ω + 820Ω // 120nF Australia / South Africa / Spain MH88422BD-1 Zin = 220Ω + 820Ω // 115nF German BABT ZV5 MH88422-2 North America Zin = 600Ω External Protection Circuit MH88422-3 Zin = 370Ω + 620Ω // 310nF UK / New Zealand 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. 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 Dummy Ringer 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. 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 1.8µF would meet the New Zealand dummy ringer requirements. 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. 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 300Ω resistance, which is loop current dependent. 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, 2-15 MH88422 Preliminary Information 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. 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 10Ω and the minimum resistance from VX to ground should be 2kΩ. Example: If R1 = R2 = 2kΩ, in Figure 3, the gain would reduce by 6.0dB. 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 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 47kΩ 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 = 100kΩ, in Figure 3, the Gain would reduce by 3.0dB. 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. Mechanical Data See Figure 10, for details of the mechanical specification. MH88422 R2 26 TIP 24 20 C2 18 16 Notes: 1) R1, R2: Transmit Gain Resistors 2) R3: Receive Gain Resistor C1 3) C1: 10µF 6V Tantalum 4) C2: Dummy Ringer Capacitor 250V 5) C3, C4: 10µF AC coupling Capacitors R1 C3 Audio Output 13 R3 C4 Audio Input VX RLS VR Protection Circuit RING TIP 11 TF RVLC 7 TXIN 5 RING LC VDD 1 AGND 3 + +5V Figure 3 - Typical Application Circuit 2-16 Ring Voltage & Loop Current Detect Output Loop Control Input MH88422 Preliminary Information . Absolute Maximum Ratings* - All voltages are with respect to AGND unless otherwise specified. Parameter 1 DC Supply Voltage 2 Storage Temperature 3 DC Loop Voltage 4 Ringing Voltage 5 Loop Current Symbol Min Max Units VDD -0.3 6 V TS -55 +125 ˚C VBAT -110 +110 V VR VR -2 150 120 Vrms Vrms ILoop - 90 mA - 2 variant - all other variants *Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied. Recommended Operating Conditions Parameter Sym Min Typ‡ Max Units 1 DC Supply Voltages VDD 4.75 5.0 5.25 V 2 Operating Temperatures TOP 0 25 70 ˚C 90 Vrms Max Units 17 Vrms Vrms 15 Vrms Vrms 7 Vrms Vrms 3 Ringing Voltage VR 75 ‡ Typical figures are at 25˚C with nominal +5V supply and are for design aid only Test Conditions 150 Vrms for -2 variant Loop Electrical Characteristics † Characteristics 1 Ringing Voltage -1 Variant Only 4 Typ‡ VR Test Conditions Externally Adjustable See MSAN-154 35 No Detect Detect 32 No Detect Detect 14 Ringing Frequency BD-1 Variant Only All other Variants 23 15 28 68 Hz Hz Operating Loop Current BD-1 Variant Only All other Variants 20 15 80 80 mA mA 28.8 V V Test circuit as Fig 4 ILoop=19mA (See Note 1) ILoop=60mA 2.4 3.1 6.0 6.0 7.8 V V V ILoop=15mA ILoop=20mA (See Note 2) ILoop=26mA 6.0 9.0 14.0 V V ILoop=15mA (See Note 3) ILoop=90mA 6.0 6.0 10.8 27 V V ILoop=20mA (See Note 4) ILoop=50mA All other Variants 3 Min No Detect Detect BD-1 Variant Only 2 Sym Off-Hook DC Voltage -1 Variant 6.0 -2 Variant -3 Variant BD-1 Variant 2-17 MH88422 Preliminary Information Loop Electrical Characteristics † (continued) 5 Leakage Current (Tip or Ring to AGND) 6 Leakage Current on-hook (Tip to Ring) 7 DC Resistance during dialling -1 Variant All other Variants 8 Dial Pulse Distortion BD-1 Variant ON OFF All other Variants ON OFF 0 0 0 0 10 µA 100V DC 9 10 µΑ VBAT = -50V 200 260 220 280 Ω Ω ILoop = 20 - 40 mA +1 +1 +2 +2 +2 +2 +4 +4 ms ms ms ms † 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. 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 Sym Supply Current IDD Low Level Output Voltage High Level Output Voltage VOL VOH Low Level Input Voltage High Level Input Voltage Low Level Input Current High Level Input Current VIL VIH IIL IIH Min Typ‡ Max Units 1 5 mA 0.4 V V IOL = 4mA IOH = 0.4mA 0.8 V V µA µA VIL = 0.0V VIH = 5.0V 2.4 2.0 -60 60 † 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. 2-18 Test Conditions VDD = 5.0V, On-hook MH88422 Preliminary Information AC Electrical Characteristics † - MH88422 All Variants Characteristics Sym Min Typ‡ Max Units 1 Input Impedance VR 47k Ω 2 Output Impedance at VX 10 Ω 3 Receive Gain (VR to 2-Wire) 4 Frequency Response Gain (relative to Gain @ 1kHz) All Variants 5 6 7 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 THD Power Supply Rejection Ratio BD-1 Variant at 2-Wire at VX PSRR All other Variants 8 Transhybrid Loss 2.5 3.5 4.6 dB Test circuit as Fig 6 Input 0.5V at 1kHz -1 -1 0 0 +1 +1 dB dB 300Hz 3400Hz +2.0 +2.0 +3.0 +3.0 THL dBm dBm THD < 5% @ 1kHz ILoop = 20 to 40mA Input -3.5dBm at 1kHz 1.2 1.2 1.2 at 2-Wire at VX Test Conditions 2.0 2.5 2.0 % % % 18 18 40 40 dB dB 12 12 20 20 dB dB 6 20 dB Ripple 0.1Vrms 1kHz on VDD Test circuit as Fig 6 Input -3.5dBm, 300-3400Hz at VR † Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated. ‡Typical figures are at 25°C 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 600Ω unless otherwise stated. 2-19 MH88422 Preliminary Information AC Electrical Characteristics† - MH88422-1 Characteristics 1 2 3 Sym Return Loss at 2-Wire (220Ω + 820Ω //120nF) Min Typ‡ 20 20 20 22 24 26 dB dB dB Test circuit as Fig 7 300-500Hz 500-2500Hz 2500-3400Hz 40 55 53 65 60 60 dB dB dB Test circuit as Fig 8 50-300Hz 300-1000Hz 1000-4000Hz 5 Units RL Longitudinal to Metallic Balance Idle Channel Noise Test Conditions Nc at 2-Wire at VX 4 Max -79 -73 -72 -58 dBmp dBmp -1.4 -0.4 0.9 dB Test circuit as Fig 5 Input 0.5V @ 1kHz Off -Hook -1.6 -2.1 -0.6 -0.5 0.4 0.9 dB dB 300Hz 3400Hz Transmit Gain (2-Wire to Vx) Frequency Response Gain (relative to Gain @ 1kHz) † 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 600Ω) Sym Min Typ‡ ERL 20 14 30 19 dB dB 58 53 60 55 dB dB SFRL 2 Max Units Longitudinal to Metallic Balance Metallic to Longitudinal Balance 60 40 3 Idle Channel Noise 5 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 Nc at 2-Wire at VX 4 dB dB Test Conditions 13 13 20 20 dBrnC dBrnC -1.4 -0.4 0.9 dB Test circuit as Fig 5 Input 0.5V @ 1kHz Off- Hook -1.6 -2.1 -1.3 -0.5 0.4 0.9 dB dB 200Hz 3400Hz Transmit Gain (2-Wire to Vx) Frequency Response Gain (relative to Gain @ 1kHz) † 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 MH88422 Preliminary Information AC Electrical Characteristics† - MH88422-3 Characteristics 1 2 3 Sym Return Loss at 2-Wire (370Ω + 620Ω // 310nF) Min Typ‡ 16 20 dB Test circuit as Fig 7 200-4000Hz 50 60 dB Test circuit as Fig 8 300-3400Hz 5 Units RL Longitudinal to Metallic Balance Idle Channel Noise Test Conditions Nc at 2-Wire at VX 4 Max -80 -80 -70 -68 dBmp dBmp -1.4 -0.4 0.9 dB Test circuit as Fig 5 Input 0.5V @ 1kHz Off-Hook -1.6 -2.1 -1.3 -0.5 0.4 0.9 dB dB 300Hz 3400Hz Transmit Gain (2-Wire to Vx) Frequency Gain (relative to gain @ 1kHz) †AC Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated. ‡Typical figures are at 25°C 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 2 3 Sym Return Loss at 2-Wire (220Ω + 820Ω // 115nF) Min Typ‡ 16 22 dB 30 40 46 65 60 60 dB dB dB 5 Units RL Longitudinal to Metallic Balance Idle Channel Noise 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 -84 -75 -70 -70 dBmp dBmp -1.4 -0.4 0.9 dB Test circuit as Fig 5 Input 0.5V @ 1kHz Off-Hook -1.6 -1.2 -1.3 -0.5 -0.4 0 dB dB 300Hz 3400Hz Transmit Gain (2-Wire to Vx) Frequency Gain (relative to gain @ 1kHz) Test Conditions Nc at 2-Wire at VX 4 Max †AC Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated. ‡Typical figures are at 25°C 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 TIP VDD RLS AGND 26 ILoop 24 IC 22 LC/ IC TF 20 470nF TXIN 18 VX RING 16 VR NC 14 RVLC/ Figure 4 - Test Circuit 1 -V +5v 10H 500Ω DUT 1 3 5 VDD AGND LC/ 9 RVLC/ 9 NC 11 VX 1uF 13 VR 100uF TIP RLS IC 26 I=20mA + 24 22 Vs Impedance = Zin TF 20 470nF TXIN 20 100uF RING 16 IC 14 10H 500Ω V Gain = 20 * Log (VX / Vs) Figure 5 - Test Circuit 2 2-22 + MH88422 Preliminary Information -V 10H 500Ω +5v DUT 1 3 VDD TIP RLS AGND + 24 22 5 LC/ IC 7 RVLC/ TF 20 9 100uF I=20mA 26 V (Zin) 470nF NC TXIN 18 11 VX RING 16 100uF + 1uF 13 Zin NC 14 VR 10H 500Ω Vs Gain = 20 * Log (V(Zin) / Vs) Figure 6 - Test Circuit 3 -V 10H 500Ω +5v DUT 1 3 VDD AGND I=20mA TIP RLS 100uF Zin 26 + 24 300Ω V1 22 5 LC/ IC 7 RVLC/ TF 20 Vs 300Ω 470nF 9 IC 11 VX 1uF 13 VR TXIN 18 100uF RING 16 IC 14 10H 500Ω + Return Loss = 20 x Log (V1 / Vs) Figure 7 - Test Circuit 4 2-23 MH88422 Preliminary Information -V 10H 500Ω +5v DUT 1 VDD 3 5 TIP RLS AGND IC LC/ 100uF I=20mA 26 + 24 300Ω 22 V1 TF 20 7 RVLC/ 300Ω 470nF 9 TXIN IC 18 100uF RING 16 11 VX 1uF 13 VR Vs 10H 500Ω IC 14 + Long. to Met. Balance = 20 * Log (V1 / Vs) Figure 8 - Test Circuit 5 -V 10H 500Ω +5v DUT 1 3 5 VDD AGND LC/ 7 RVLC/ TIP RLS IC I=20mA 26 100uF + 24 300Ω 22 Vs TF 20 300Ω 470nF 9 IC 11 VX 1uF 13 VR TXIN 18 100uF RING 16 IC 14 + 10H 500Ω Met. to Long. Balance = 20 * Log (V1 / Vs) Figure 9 - Test Circuit 6 2-24 510Ω V1 MH88422 Preliminary Information 0.19 Max (4.8 Max) 0.27 Max (6.9 Max) 0.063 Max (1.6 Max) 0.08 Typ (2 Typ) 0.90 Typ * (22.9 Typ) * 0.20+0.01 * 0.10 Typ (5.08+0.25) (2.54 Typ) 0.020 + 0.005 (0.5 + 0.12) 0.95 Max (24.2 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 260˚C 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. 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