MH Data Access Arrangement Preliminary Information. Features. Description. Applications. Ordering Informations

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1 MH884 Data Access Arrangement Features FAX and Modem interface (2) ariants 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 operation, low on-hook power (mw) Full duplex data transmission Applications Interface to Central Office or PABX line for: Modem FAX Telemetry MH884-/2/3 MH884BD- Description ISSUE October Ordering Informations 0 C to 0 C Pin DIL Package Pin DIL Package The Mitel MH884 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. Isolation Barrier DD Input Buffer & Line Termination Opto- Isolation Opto- Isolation Logic Input Buffer Audio Buffer LC R Opto- Isolation Opto- Isolation Audio Buffer Ring & Loop Buffer Transhybrid loss cancellation circuit X RLC Network Connections User Connections Figure - Functional Block Diagram 2-

2 MH884 DD LC RLC /NP X /NP R /NP /NP NP NP Figure 2 - Pin Connections Pin Description Pin # Name Description DD Positive Supply oltage.. 2, 4, 6, Internal Connection. This pin is cropped short. 8, 3 Analog Ground. 4-Wire Ground. Normally connected to System Ground. 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. RLC Ringing oltage and Current Detect (Output). Indicates the status of loop current and ringing voltage. 0, 2 /NP Internal Connection or No Pin Fitted. This pin is either cropped short or not fitted, depending on the variant. See Note X Transmit (Output). Analog output to modem/fax chip set. R Receive (Input). Analog input to modem/fax chip set. 4, Internal Connection. This pin is cropped short., NP No Pin Fitted. 6 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 pin. 2, 23 /NP Internal Connection or No Pin Fitted. This pin is either cropped short or not fitted, depending on the variant. See Note Ringing Loop Sense. Connects externally to the pin. 2 Internal Connection. This pin is cropped short. Tip Lead. Connects to the "Tip" lead of a telephone line. Notes:. ariant, 4 BD- - pins 0,2, & 2 are cropped short. Pin 23 is not fitted. 2. ariant 2 - pin 23 is cropped short. Pins 0, 2 & 2 are not fitted. 3. ariant 3 - pins 2 and 2 are cropped short. Pins 0 and 23 are not fitted. 2-4

3 MH884 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 subscriber data transmission equipment such as Modems, Facsimiles (Fax s), Remote Metering and Electronic Point of Sale equipment. 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 3k r.m.s., for example a lightning strike. It also provides full isolation for a continuous AC voltage level of up to 20 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. 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, 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. The MH884 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. MH884- Zin = 2Ω 8Ω // nf Australia / South Africa / Spain MH884BD- Zin = 2Ω 8Ω // nf German BABT Z MH884-2 North America Zin = 600Ω MH884-3 Zin = 30Ω 6Ω // 30nF UK / New Zealand 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-4. For example, Figure 3 shows capacitor C2 which if set to.8µf 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 X, as required by modem/fax chip sets. Conversely the device converts the ground referenced signal input at R, 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 R, being sent to the line, must not appear at the output X. In order to prevent this, the device has an internal cancellation circuit. The measure of attenuation is Transhybrid Loss (THL). The Transmit (X) and Receive (R) signals are ground referenced (), and biased to 2.. The 2-

4 MH884 device must be in the off-hook condition for transmission or reception to take place. Transmit Gain The Transmit Gain of the MH884 is the gain from the differential signal across Tip and Ring to the ground referenced signal at X. 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 MH884 variant used, must match the specified line impedance. By adding an external potential divider to X, it is possible to reduce the overall gain in the application. The output impedance of X is approximately 0Ω and the minimum resistance from X to ground should be 2kΩ. Example: If R = R2 = 2kΩ, in Figure 3, the gain would reduce by 6.0. Receive Gain The Receive Gain of the MH884 is the gain from the ground referenced signal at R 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 MH884 variant used, must match the specified line impedance. The input impedance to ground of R is 4kΩ 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 = 00kΩ, in Figure 3, the Gain would reduce by 3.0. Supervisory Features The device is capable of monitoring the line conditions across Tip and Ring, this is shown in Figure 3. The Ringing oltage Loop Current detect pin (RLC), indicates the status of the device. The RLC output is at logic 0 when loop current flows, indicating that the MH884 is in an off hook state. When the device is generating dial pulses, the RLC pin outputs a TTL pulse at the same rate. An AC ringing voltage across Tip and Ring will cause RLC to output a TTL pulse at double the ringing frequency with an envelope determined by the ringing cadence. Mechanical Data See Figure 0, for details of the mechanical specification. MH884 X R R2 C3 Audio Output Protection Circuit C2 R RLC R3 C4 Audio Input Ring oltage & Loop Current Detect Output Notes: ) R, R2: Transmit Gain Resistors 2) R3: Receive Gain Resistor 3) C: 0µF 6 Tantalum 4) C2: Dummy Ringer Capacitor ) C3, C4: 0µF AC coupling Capacitors 6 C DD 3 LC Loop Control Input Figure 3 - Typical Application Circuit 2-6

5 MH884 Absolute Maximum Ratings* - All voltages are with respect to unless otherwise specified. Parameter Symbol Min Max Units. DC Supply oltage DD Storage Temperature T S - 2 C 3 DC Loop oltage BAT Ringing oltage - 2 variant - all other variants R - R -2 Loop Current I Loop - 0 ma *Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied. 0 rms rms Recommended Operating Conditions Parameter Sym Min Typ Max Units Test Conditions DC Supply oltages DD Operating Temperatures T OP C 3 Ringing oltage R 0 rms Typical figures are at 2 C with nominal supply and are for design aid only Loop Electrical Characteristics Characteristics Sym Min Typ Max Units Test Conditions Ringing oltage - ariant Only No Detect Detect R 3 rms rms Externally Adjustable - See MSAN-4 BD- ariant Only No Detect Detect 32 rms rms All other ariants No Detect Detect 4 rms rms 2 Ringing Frequency BD- ariant Only All other ariants Hz Hz 3 Operating Loop Current BD- ariant Only All other ariants ma ma 4 Off-Hook DC oltage - ariant Test circuit as Fig 4 I Loop =ma (See Note ) I Loop =60mA -2 ariant I Loop =ma I Loop =ma (See Note 2) I Loop =ma -3 ariant I Loop =ma (See Note 3) I Loop =0mA BD- ariant I Loop =ma (See Note 4) I Loop =0mA 2-

6 MH884 Loop Electrical Characteristics (continued) Leakage Current (Tip or Ring to ) 6 Leakage Current on-hook (Tip to Ring) DC Resistance during dialling - ariant All other ariants 8 Dial Pulse Distortion BD- ariant ON OFF All other ariants ON OFF µa 00 DC 0 µα BAT = Ω Ω ms ms ms ms I Loop = - 40 ma Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated. Typical figures are at 2 C with nominal supplies and are for design aid only. Note : Refer to FTZ TR2 section 2.2 Note 2: Refer to EIA/TIA 464 section Note 3: Refer to BS630 section 4.3. Note 4: Refer to Z Annex DC Electrical Characteristics Characteristics Sym Min Typ Max Units Test Conditions Supply Current I DD ma DD =.0, On-hook 2 RLC Low Level Output oltage High Level Output oltage 3 LC Low Level Input oltage High Level Input oltage Low Level Input Current High Level Input Current OL OH I IH Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated. Typical figures are at 2 C with nominal supplies and are for design aid only. IL IH I IL µa µa I OL = 4mA I OH = 0.4mA IL = 0.0 IH =.0 2-

7 MH884 AC Electrical Characteristics - MH884 All ariants Characteristics Sym Min Typ Max Units Test Conditions Input Impedance R 4k Ω 2 Output Impedance at X 0 Ω 3 Receive Gain (R to 2-Wire) Test circuit as Fig 6 Input 0. at khz 4 Frequency Response Gain (relative to khz) All ariants Hz 3400Hz Signal Output Overload Level at 2-Wire at x m m THD < khz I Loop = to 40mA 6 Total Harmonic Distortion BD- ariant at 2-Wire All other ariants at 2-Wire All ariants at X THD % % % Input -3.m at khz Power Supply Rejection Ratio BD- ariant at 2-Wire at X PSRR Ripple 0.rms khz on DD All other ariants at 2-Wire at X 8 Transhybrid Loss THL 6 Test circuit as Fig 6 Input -3.m, Hz at R Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated. Typical figures are at 2 C with nominal and are for design aid only. Note : All of the above test conditions use a test source impedance which matches the device s impedance. Note 2: m is referenced to 600Ω unless otherwise stated

8 MH884 AC Electrical Characteristics - MH884- Characteristics Sym Min Typ Max Units Test Conditions 2-Wire Input Impedance (2Ω 8Ω //nf) Zin 00 khz 2 Return Loss at 2-Wire (2Ω 8Ω //nf) 3 Longitudinal to Metallic Balance 4 Idle Channel Noise at 2-Wire at X Transmit Gain (2-Wire to x) 6 Frequency Response Gain (relative to khz) Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated. Typical figures are at 2 C with nominal and are for design aid only Note : All of the above test conditions use a test source impedance which matches the device s impedance. RL Nc mp mp Test circuit as Fig Hz Hz Hz Test circuit as Fig Hz Hz Hz Test circuit as Fig Input khz Off -Hook 300Hz 3400Hz AC Electrical Characteristics - MH884-2 Characteristics Sym Min Typ Max Units Test Conditions 2-Wire Input Impedance (600Ω) Zin 600 khz 2 Return Loss at 2-Wire (Reference 600Ω) 3 Longitudinal to Metallic Balance Metallic to Longitudinal Balance 4 Idle Channel Noise at 2-Wire at X Transmit Gain (2-Wire to x) 6 Frequency Response Gain (relative to khz) ERL SFRL Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated. Typical figures are at 2 C with nominal supply and are for design aid only Note : All of the above test conditions use a test source impedance which matches the device s impedance. Nc rnc rnc Test circuit as Fig Hz 0-30Hz Test circuit as Fig Hz Hz Test circuit as Fig 0-000Hz Hz Test circuit as Fig Input khz Off- Hook 0Hz 3400Hz 2-

9 MH884 AC Electrical Characteristics - MH884-3 Characteristics Sym Min Typ Max Units Test Conditions 2-Wire Input Impedance (30Ω 6Ω // 30nF) 2 Return Loss at 2-Wire (30Ω 6Ω // 30nF) 3 Longitudinal to Metallic Balance 4 Idle Channel Noise at 2-Wire at X Transmit Gain (2-Wire to x) 6 Frequency Gain (relative to khz) Zin 00 khz AC Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated. Typical figures are at 2 C with nominal and are for design aid only. Note : All of the above test conditions use a test source impedance which matches the device s impedance. RL Nc mp mp Test circuit as Fig Hz Test circuit as Fig Hz Test circuit as Fig Input khz Off-Hook 300Hz 3400Hz AC Electrical Characteristics - MH884BD- Characteristics Sym Min Typ Max Units Test Conditions 2-Wire Input Impedance (2Ω 8Ω // nf) 2 Return Loss at 2-Wire (2Ω 8Ω // nf) 3 Longitudinal to Metallic Balance 4 Idle Channel Noise at 2-Wire at X Transmit Gain (2-Wire to x) 6 Frequency Gain (relative to khz) Zin 00 khz RL Nc mp mp Test circuit as Fig Hz Ref Z Sec 2..2 and Test circuit as Fig Hz Hz Hz Ref Z Sec Test circuit as Fig Input khz Off-Hook 300Hz 3400Hz AC Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated. Typical figures are at 2 C with nominal and are for design aid only. Note : All of the above test conditions use a test source impedance which matches the device s impedance. 2-2

10 MH884 DUT DD ILoop 3 LC/ RLC/ 40nF 6 X uf R NC 4 Figure 4 - Test Circuit - v 3 DD DUT 00uF I=mA Gain = * Log (X / s) LC/ RLC/ 40nF uf NC X 6 R 4 00uF s Impedance = Zin Figure - Test Circuit 2 2-

11 MH884 - v 3 DD DUT I=mA 00uF s LC/ RLC/ NC X 6 uf R NC 4 40nF 00uF Zin Gain = * Log ((Zin) / s) Figure 6 - Test Circuit 3 - v DUT DD 3 LC/ RLC/ X 6 uf R 4 40nF I=mA 00uF Zin 00uF 300Ω 300Ω s Return Loss = * Log ( / s) Figure - Test Circuit

12 MH884 - v DUT DD 3 LC/ RLC/ X 6 uf R 4 40nF I=mA 00uF 00uF 300Ω 300Ω s Long. to Met. Balance = * Log ( / s) Figure 8 - Test Circuit - v DUT DD 3 LC/ RLC/ X 6 uf R 4 40nF I=mA 00uF 300Ω 300Ω 00uF 0Ω s Met. to Long. Balance = * Log ( / s) Figure - Test Circuit 6 2-

13 MH Max (4.8 Max) 0.0 Typ * (. Typ) 0. Max (.2 Max) 0.2 Max (6. Max) 0.08 Typ (2 Typ) * (.080.2) (0. 0.2) * 0.0 Typ (2.4 Typ) Max (.6 Max) (6.60.4).42 Max (36. Max) Notes: ) 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 0 C for 0 secs. * Dimensions to centre of pin. ) Short-cropped pins differ between variants. (see pin description) & BD- variant short. Figure 0 - Mechanical Data for -Pin DIL Hybrid 2-2

14 MH884 Notes: 2-

Ag2120 FULLY FEATURED PSTN INTERFACE

Ag2120 FULLY FEATURED PSTN INTERFACE Silvertel 3.0 October 2016 Datasheet Pb Approved to: EN 60950-1:2001 IEC60950-1: First Edition 2001 AS/NZ60950-1: 2003 UL60950-1: 2003 1 st Edition CSA 22.2 No.60950-1-03 1 st Edition FEATURES A highly