MH88422 Data Access Arrangement Preliminary Information ISSUE 9 October 1997 Features Ordering Informations • FAX and Modem interface (V29) • Variants available with different line MH88422-1/2/3 26 Pin DIL Package impedances MH88422BD-1 26 Pin DIL Package • Provides reinforced barrier to international PTT 0°C to 70°C requirements • Transformerless 2-4 Wire conversion. Description • Integral Loop Switch • Dial Pulse and DTMF operation The Mitel MH88422 Data Access Arrangement • Line state detection outputs (D.A.A.) provides a complete interface between data • -loop current/ringing outputs transmission equipment and a telephone line. All • Single +5V operation, low on-hook power functions are integrated into a single thick film hybrid (5mW) module which provides high voltage isolation, very high reliability and optimum circuit design needing a • Full duplex data transmission minimum of external components. Applications A number of variants are available to meet particular country impedance requirements. The D.A.A. has Interface to Central Office or PABX line for: been designed to meet regulatory approvals requirements in these countries. • Modem •FAX • Telemetry Isolation Barrier VDD AGND Opto- Logic Input LC Input Buffer Isolation TIP Buffer & Line Termination RING Opto- Audio VR Buffer Isolation TXIN Transhybrid Opto- Audio VX loss Isolation Buffer cancellation TF circuit Opto- Ring & Loop RVLC RLS Buffer Isolation User Connections Network Connections Figure 1 - Functional Block Diagram 2-13 MH88422 Preliminary Information VDD 1 26 TIP 25 IC 2 IC AGND 3 24 RLS 23 IC 4 IC/NP LC 5 22 IC 6 21 IC IC/NP 20 RVLC 7 TF 8 19 IC NP 18 IC 9 TXIN 10 17 IC/NP IC 16 VX 11 RING 12 15 IC/NP NP 14 VR 13 IC Figure 2 - Pin Connections Pin Description Pin # Name Description 1 VDD Positive Supply Voltage. +5V. 2, 4, 6, IC Internal Connection. This pin is cropped short. 8, 9 3 AGND Analog Ground. 4-Wire Ground. Normally connected to System Ground. 5 LC 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. 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 Tip Feed. Connects externally to the RLS pin. 21, 23 IC/NP Internal Connection or No Pin Fitted. This pin is either cropped short or not fitted, depending on the variant. See Note 1 24 RLS Ringing Loop Sense. Connects externally to the TF pin. 25 IC Internal Connection. This pin is cropped short. 26 TIP Tip Lead. Connects to the "Tip" lead of a telephone line. 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 MH88422 Functional Description Input Impedance The device is a Data Access Arrangement (D.A.A.). It The MH88422 is available in a number of different is used to correctly terminate a 2-Wire analog loop. It variants each of which has its own fixed Tip-Ring AC provides a signalling link and a 2-4 Wire line input impedance (Zin). Each variant is identified by interface between an analog loop and subscriber the final digit in its part number, as listed below. Also data transmission equipment such as Modems, shown are the countries whose PTT requirements Facsimiles (Fax’s), Remote Metering and Electronic match these impedances. Point of Sale equipment. MH88422-1 Zin = 220Ω + 820Ω // 120nF Isolation Barrier Australia / South Africa / Spain MH88422BD-1 Zin = 220Ω + 820Ω // 115nF The device provides an isolation barrier implemented by using optocouplers. This is a reinforced barrier for German BABT ZV5 an instantaneous power surge of up to 3kV r.m.s., for example a lightning strike. It also provides full MH88422-2 Zin = 600Ω isolation for a continuous AC voltage level of up to North America 250V r.m.s. MH88422-3 Zin = 370Ω + 620Ω // 310nF External Protection Circuit UK / New Zealand Should the input voltage from the line exceed that Dummy Ringer isolated by the optocoupler, an External Protection Circuit assists in preventing damage to the device This device supports a dummy ringer option which and the subscriber equipment. See Figure 3. can be configured by the inclusion of external components. Further details relating to component Line Termination 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 When Loop Control (LC) is at a logic 0, a line Zealand dummy ringer requirements. 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 2-4 Wire Conversion a DC line termination and an AC input impedance. The device converts the balanced 2-Wire input, When LC is at a logic 1, a Dummy Ringer is applied presented by the line at Tip and Ring, to a ground across Tip and Ring. The device can be considered referenced signal at VX, as required by modem/fax on-hook and negligible DC current will flow. The chip sets. dummy ringer is an AC load, which represents a telephone’s mechanical ringer. Conversely the device converts the ground referenced signal input at VR, to a balanced 2-Wire DC Line Termination signal across Tip and Ring. When LC is at a logic 0, an active termination is During full duplex transmission, the signal at Tip and applied across Tip and Ring, at which time it can be Ring consists of both the signal from the device to considered to be in an off-hook state. This is used to the line and the signal from the line to the device. terminate an incoming call, seize the line for an The signal input at VR, being sent to the line, must outgoing call, or if it is applied and disconnected at not appear at the output VX. In order to prevent this, the required rate, can be used to generate dial the device has an internal cancellation circuit. The pulses. This termination resembles approximately measure of attenuation is Transhybrid Loss (THL). 300Ω resistance, which is loop current dependent. The Transmit (VX) and Receive (VR) signals are ground referenced (AGND), and biased to 2.5V. The 2-15 MH88422 Preliminary Information device must be in the off-hook condition for The input impedance to ground of VR is 47kΩ and this transmission or reception to take place. can be used with an external series resistor to form a potential divider and reduce the overall gain in the application. Transmit Gain Example: If R3 = 100kΩ, in Figure 3, the Gain would The Transmit Gain of the MH88422 is the gain from the reduce by 3.0dB. differential signal across Tip and Ring to the ground referenced signal at VX. The internal Transmit Gain of Supervisory Features 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 The device is capable of monitoring the line variant used, must match the specified line conditions across Tip and Ring, this is shown in impedance. Figure 3. The Ringing Voltage Loop Current detect pin (RVLC), indicates the status of the device. The By adding an external potential divider to VX, it is RVLC output is at logic 0 when loop current flows, possible to reduce the overall gain in the application. indicating that the MH88422 is in an off hook state. The output impedance of VX is approximately 10Ω and the minimum resistance from VX to ground should be When the device is generating dial pulses, the RVLC 2kΩ. pin outputs a TTL pulse at the same rate. Example: If R1 = R2 = 2kΩ, in Figure 3, the gain would An AC ringing voltage across Tip and Ring will cause reduce by 6.0dB. RVLC to output a TTL pulse at double the ringing frequency with an envelope determined by the Receive Gain ringing cadence. Mechanical Data 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 See Figure 10, for details of the mechanical of the device is fixed as shown in the AC Electrical specification. Characteristics table. For the correct gain, the Input Impedance of the MH88422 variant used, must match the specified line impedance. MH88422 R2 11 R1 26 C3 Audio TIP TIP VX Output 24 RLS R3 13 C4 Audio VR Protection Input Circuit 20 TF 7 Ring Voltage & Loop C2 RVLC 18 Current Detect Output TXIN 5 16 RING Loop Control Input RING LC AGND VDD 1 3 Notes: 1) R1, R2: Transmit Gain Resistors 2) R3: Receive Gain Resistor C1 + 3) C1: 10μF 6V Tantalum 4) C2: Dummy Ringer Capacitor 5) C3, C4: 10μF AC coupling Capacitors +5V Figure 3 - Typical Application Circuit 2-16 Preliminary Information MH88422 . Absolute Maximum Ratings* - All voltages are with respect to AGND unless otherwise specified. Parameter Symbol Min Max Units 1 DC Supply Voltage V -0.3 6 V DD 2 Storage Temperature T -55 +125 ˚C S 3 DC Loop Voltage V -110 +110 V BAT 4 Ringing Voltage - 2 variant V - 130 Vrms R - all other variants V -2 120 Vrms R 5 Loop Current I -90 mA Loop *Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied. Recommended Operating Conditions ‡ Parameter Sym Min Typ Max Units Test Conditions V 1 DC Supply Voltages V 4.75 5.0 5.25 DD 2 Operating Temperatures T 025 70 ˚C OP 3 Ringing Voltage V 75 90 Vrms R ‡ Typical figures are at 25˚C with nominal +5V supply and are for design aid only † Loop Electrical Characteristics ‡ Characteristics Sym Min Typ Max Units Test Conditions 1 Ringing Voltage VR Externally Adjustable - -1 Variant Only No Detect 17 Vrms See MSAN-154 Detect 35 Vrms BD-1 Variant Only No Detect 15 Vrms Detect 32 Vrms All other Variants No Detect 7 Vrms Detect 14 Vrms 2 Ringing Frequency BD-1 Variant Only 23 28 Hz All other Variants 15 68 Hz 3 Operating Loop Current BD-1 Variant Only 20 80 mA All other Variants 15 80 mA 4 Off-Hook DC Voltage Test circuit as Fig 4 -1 Variant 6.0 V I =19mA (See Note 1) Loop 28.8 V I =60mA Loop -2 Variant 6.0 V I =15mA Loop 2.4 6.0 V I =20mA (See Note 2) Loop 3.1 7.8 V I =26mA Loop -3 Variant 9.0 V I =15mA (See Note 3) Loop 6.0 14.0 V I =90mA Loop BD-1 Variant 6.0 10.8 V I =20mA (See Note 4) Loop 6.0 27 V I =50mA Loop 2-17 MH88422 Preliminary Information † Loop Electrical Characteristics (continued) 5 Leakage Current 10 μA 100V DC (Tip or Ring to AGND) 6 Leakage Current on-hook 910 μΑ V = -50V BAT (Tip to Ring) 7 DC Resistance during dialling -1 Variant 200 220 Ω I = 20 - 40 mA Loop All other Variants 260 280 Ω 8 Dial Pulse Distortion BD-1 Variant ON 0 +1 +2 ms OFF 0 +1 +2 ms All other Variants ON 0 +2 +4 ms OFF 0 +2 +4 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 Sym Min Typ Max Units Test Conditions 1 Supply Current I 15 mA V = 5.0V, On-hook DD DD 2 RVLC Low Level Output Voltage V 0.4 V I = 4mA OL OL High Level Output Voltage V 2.4 V I = 0.4mA OH OH 3 LC Low Level Input Voltage V 0.8 V IL 2.0 High Level Input Voltage V V IH Low Level Input Current I -60 μA V = 0.0V IL IL High Level Input Current I 60 μA V = 5.0V IH IH � 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 Preliminary Information MH88422 † AC Electrical Characteristics - MH88422 All Variants ‡ Characteristics Sym Min Typ Max Units Test Conditions 1 Input Impedance VR 47k Ω 2 Output Impedance at VX 10 Ω 3 Receive Gain (VR to 2-Wire) 2.5 3.5 4.6 Test circuit as Fig 6 dB Input 0.5V at 1kHz 4 Frequency Response Gain (relative to Gain @ 1kHz) All Variants -1 0 +1 dB 300Hz -1 0 +1 dB 3400Hz 5 Signal Output Overload Level THD < 5% @ 1kHz at 2-Wire +2.0 +3.0 dBm I = 20 to 40mA Loop at Vx +2.0 +3.0 dBm 6 Total Harmonic Distortion THD Input -3.5dBm at 1kHz BD-1 Variant at 2-Wire 1.2 2.0 % All other Variants at 2-Wire 1.2 2.5 % All Variants at VX 1.2 2.0 % 7 Power Supply Rejection Ratio PSRR Ripple 0.1Vrms 1kHz BD-1 Variant at 2-Wire 18 40 dB on V DD at VX 18 40 dB All other Variants at 2-Wire 25 30 dB at VX 25 30 dB 8 Transhybrid Loss THL 6 20 dB Test circuit as Fig 6 Input -3.5dBm, 300-3400Hz at V R � 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 Sym Min Typ Max Units Test Conditions Zin 1 2-Wire Input Impedance 900 Ω @ 1kHz (220Ω + 820Ω //120nF) RL 2 Return Loss at 2-Wire Test circuit as Fig 7 (220Ω + 820Ω //120nF) 20 22 dB 300-500Hz 20 24 dB 500-2500Hz 20 26 dB 2500-3400Hz 3 Longitudinal to Metallic Balance Test circuit as Fig 8 40 65 dB 50-300Hz 55 60 dB 300-1000Hz 53 60 dB 1000-4000Hz Nc 4 Idle Channel Noise at 2-Wire -79 -72 dBmp at VX -73 -58 dBmp 5 Transmit Gain (2-Wire to Vx) Test circuit as Fig 5 -1.4 -0.4 0.9 dB Input 0.5V @ 1kHz Off -Hook 6 Frequency Response Gain -1.6 -0.6 0.4 dB 300Hz (relative to Gain @ 1kHz) -2.1 -0.5 0.9 dB 3400Hz � 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 - MH88422-2 ‡ Characteristics Sym Min Typ Max Units Test Conditions Zin 1 2-Wire Input Impedance 600 Ω @ 1kHz (600Ω) 2 Return Loss at 2-Wire Test circuit as Fig 7 ERL (Reference 600Ω) 20 30 dB 500-2500Hz SFRL 14 19 dB 200-3200Hz 3 Longitudinal to Metallic Balance Test circuit as Fig 8 58 60 dB 200-1000Hz 53 55 dB 1000-3000Hz Metallic to Longitudinal Balance Test circuit as Fig 9 60 dB 200-1000Hz 40 dB 1000-4000Hz 4 Idle Channel Noise Nc at 2-Wire 13 20 dBrnC at VX 13 20 dBrnC 5 Transmit Gain (2-Wire to Vx) Test circuit as Fig 5 -1.4 -0.4 0.9 dB Input 0.5V @ 1kHz Off- Hook 6 Frequency Response Gain -1.6 -1.3 0.4 dB 200Hz (relative to Gain @ 1kHz) -2.1 -0.5 0.9 dB 3400Hz � Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated. ‡ Typical figures are at 25°C 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 MH88422 † AC Electrical Characteristics - MH88422-3 ‡ Characteristics Sym Min Typ Max Units Test Conditions Zin 1 2-Wire Input Impedance 700 Ω @ 1kHz (370Ω + 620Ω // 310nF) RL 2 Return Loss at 2-Wire Test circuit as Fig 7 (370Ω + 620Ω // 310nF) 16 20 dB 200-4000Hz 3 Longitudinal to Metallic Balance Test circuit as Fig 8 50 60 dB 300-3400Hz 4 Idle Channel Noise Nc at 2-Wire -80 -70 dBmp at VX -80 -68 dBmp 5 Transmit Gain (2-Wire to Vx) Test circuit as Fig 5 -1.4 -0.4 0.9 dB Input 0.5V @ 1kHz Off-Hook 6 Frequency Gain -1.6 -1.3 0.4 dB 300Hz (relative to gain @ 1kHz) -2.1 -0.5 0.9 dB 3400Hz �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 Sym Min Typ Max Units Test Conditions 1 2-Wire Input Impedance Zin 900 Ω @ 1kHz (220Ω + 820Ω // 115nF) RL 2 Return Loss at 2-Wire Test circuit as Fig 7 (220Ω + 820Ω // 115nF) 16 22 dB 300-3400Hz Ref ZV5 Sec 2.5.2 and 2.8.3 3 Longitudinal to Metallic Balance Test circuit as Fig 8 30 65 dB 50-300Hz 40 60 dB 300-600Hz 46 60 dB 600-4000Hz Ref ZV5 Sec 2.8.2 4 Idle Channel Noise Nc at 2-Wire -84 -70 dBmp at VX -75 -70 dBmp 5 Transmit Gain (2-Wire to Vx) Test circuit as Fig 5 -1.4 -0.4 0.9 dB Input 0.5V @ 1kHz Off-Hook 6 Frequency Gain -1.6 -1.3 -0.4 dB 300Hz (relative to gain @ 1kHz) -1.2 -0.5 0 dB 3400Hz �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 ILoop 1 26 TIP VDD 24 3 RLS AGND 5 22 IC LC/ 20 7 TF RVLC/ 470nF 9 18 TXIN IC 16 11 RING VX 1uF 13 14 NC VR Figure 4 - Test Circuit 1 -V +5v 10H 500Ω DUT 100uF 1 I=20mA 26 VDD TIP + 24 3 RLS AGND 5 22 IC LC/ Vs Impedance = Zin 20 9 TF RVLC/ 470nF 9 20 NC TXIN 100uF 16 11 RING VX 1uF + 10H 500Ω 13 14 IC VR Gain = 20 * Log (VX / Vs) Figure 5 - Test Circuit 2 2-22 Preliminary Information MH88422 -V 10H 500Ω +5v DUT 100uF I=20mA 1 26 VDD TIP + 3 24 RLS AGND 22 5 IC LC/ Zin 20 7 TF RVLC/ 470nF 9 18 TXIN NC 100uF 16 11 RING VX + 1uF 13 14 NC VR 10H 500Ω Vs Gain = 20 * Log (V(Zin) / Vs) Figure 6 - Test Circuit 3 -V 10H 500Ω +5v DUT I=20mA 100uF Zin 26 1 VDD TIP + 24 3 RLS AGND 300Ω V1 22 5 IC LC/ Vs 20 7 TF RVLC/ 470nF 300Ω 9 18 IC TXIN 100uF 16 11 RING VX 1uF + 10H 500Ω 13 14 IC VR Return Loss = 20 * Log (V1 / Vs) Figure 7 - Test Circuit 4 2-23 MH88422 Preliminary Information -V +5v 10H 500Ω DUT 100uF I=20mA 26 1 VDD TIP + 3 24 RLS AGND 300Ω 22 5 IC LC/ V1 20 7 Vs TF RVLC/ 470nF 300Ω 18 9 IC TXIN 100uF 16 11 RING VX 1uF + 10H 500Ω 13 14 IC VR Long. to Met. Balance = 20 * Log (V1 / Vs) Figure 8 - Test Circuit 5 -V +5v 10H 500Ω DUT 100uF I=20mA 26 1 VDD TIP + 3 24 AGND RLS 300Ω 22 5 LC/ IC Vs 20 7 TF RVLC/ 510Ω 300Ω V1 470nF 9 18 IC TXIN 100uF 16 11 RING VX + 1uF 10H 500Ω 13 14 IC VR 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) 0.063 Max (1.6 Max) 0.08 Typ (2 Typ) * * 0.10 Typ 0.20+0.01 * 0.26+0.015 0.90 Typ (6.6+0.4) (22.9 Typ) (5.08+0.25) (2.54 Typ) 0.020 + 0.005 0.95 Max (0.5 + 0.12) (24.2 Max) 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. 1 * Dimensions to centre of pin. 5) Short-cropped pins differ between variants. (see pin description) 1 & BD-1 variant short. Figure 10 - Mechanical Data for 26-Pin DIL Hybrid 2-25 MH88422 Preliminary Information Notes: 2-26