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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 The Zarlink 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. MH88422-2 26 Pin DIL Package
DS5067 ISSUE 11 November 2001
Ordering Informations
0C to 70C
Description
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 Transhybrid loss cancellation circuit
TIP RING
Input Buffer & Line Termination
LC
VR
Audio Buffer Ring & Loop Buffer
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 NP VX VR IC NP RING TXIN TF IC/NP 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. No Pin Fitted. 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. No Pin Fitted. Internal Connection. This pin is cropped short. 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
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 has its own fixed Tip-Ring AC input impedance (Zin). Also shown are the countries whose PTT requirements match the impedances. 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.
This country passes equipment approved to CTR21. The MH88422 will not meet this specification. See the MH88437 datasheet for a CTR21 Product.
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.
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.
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, 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.
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.
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.
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.
2-15
MH88422
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.
Preliminary Information
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 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.
Mechanical Data
See Figure 10, for details of the mechanical specification.
MH88422 R2 TIP 26 24 Protection Circuit C2 TIP RLS VR 20 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
18
RING
16
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 Symbol VDD TS VBAT VR ILoop Min -0.3 -55 -110 -
MH88422
.
Max 6 +125 +110 150 90
Units V C V 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 No Detect Detect Ringing Frequency Operating Loop Current Off-Hook DC Voltage 2.4 3.1 Sym Min 14 15 15 68 80 6.0 6.0 7.8 Typ Max 7 Units Vrms Vrms Hz mA V V V ILoop=15mA ILoop=20mA (See Note 2) ILoop=26mA Test Conditions Externally Adjustable See MSAN-154
2 3 4
5 6 7 8
Leakage Current (Tip or Ring to AGND) Leakage Current on-hook (Tip to Ring) DC Resistance during dialling Dial Pulse Distortion ON OFF 0 0 +2 +2 9 260
10 10 280
A
100V DC VBAT = -50V
+4 +4
ms ms
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
2-17
MH88422
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
Preliminary Information
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
VIL = 0.0V VIH = 5.0V
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.
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 6 7 8 9 Frequency Response Gain (relative to Gain @ 1kHz) Input Impedance VR Output Impedance at VX Receive Gain (VR to 2-Wire) Frequency Response Gain (relative to Gain @ 1kHz) -1 -1 10 Signal Output Overload Level at 2-Wire at Vx Total Harmonic Distortion at 2-Wire at Vx
THD
Sym
ERL
Min 20 14
Typ 30 19 60 55
Max
Units dB dB dB dB 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
Nc 13 13 -0.4 -1.3 -0.5 47k 10 2.5 3.5 4.6 20 20 0.9 0.4 0.9 dBrnC dBrnC dB dB dB dB Test circuit as Fig 6 Input 0.5V at 1kHz Test circuit as Fig 5 Input 0.5V @ 1kHz Off- Hook 200Hz 3400Hz
-1.6 -2.1
0 0 +3.0 +3.0 1.2 1.2
+1 +1
dB dB dBm dBm
300Hz 3400Hz THD< 5% @1kHz ILoop = 20 to 40mA Input -3.5dBm at 1kHz
+2.0 +2.0
11
2.5 2.0
% %
2-18
Preliminary Information
AC Electrical Characteristics - MH88422-2
7 Power Supply Rejection Ratio at 2-Wire at Vx Transhybrid Loss
PSRR
MH88422
Ripple 0.1 Vrms 1kHz 12 12
THL
20 20 20
dB dB dB Test cicuit as Fig 6 Input -3.5dBm, 300-3400Hz at VR
8
6
Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated. Typical figures are at 25xC 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. Note 2: dBm is referenced to 600 unless otherwise stated. +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 11 VX 1uF 13 VR V
TF 20 470nF TXIN 20 RING 16 IC 14 100uF + 10H 500
Vs Impedance = Zin
Gain = 20 * Log (VX / Vs)
Figure 5 - Test Circuit 2
2-19
MH88422
-V +5v DUT 1 3 VDD AGND TIP RLS IC 26 24 22 I=20mA 10H 500
Preliminary Information
100uF +
5 LC/ 7 RVLC/ 9 NC 11 VX 1uF 13 Vs Gain = 20 * Log (V(Zin) / Vs) VR
V (Zin) 470nF
TF 20 TXIN 18 RING 16 NC 14 100uF + 10H 500
Zin
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 11 VX 1uF 13 VR TXIN 18 RING 16 IC 14 10H 500 + 100uF 300 I=20mA 100uF Zin +
5 LC/ 7 RVLC/
TF 20
Return Loss = 20 x Log (V1 / Vs)
Figure 7 - Test Circuit
2-20
Preliminary Information
-V +5v DUT 1 3 5 VDD AGND LC/ TIP RLS IC 26 24 22 V1 7 RVLC/ 9 IC TF 20 470nF TXIN 18 100uF + IC 14 10H 500 300 300 I=20mA 100uF + 10H 500
MH88422
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 11 VX 1uF 13 VR TXIN 18 100uF + 10H 500 300 510 V1 I=20mA 100uF + 10H 500
7 RVLC/
TF 20
RING 16 IC 14
Met. to Long. Balance = 20 * Log (V1 / Vs)
Figure 9 - Test Circuit 6
2-21
MH88422
Preliminary Information
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. (see pin description)
1
Figure 10 - Mechanical Data for 26-Pin DIL Hybrid
2-22
Preliminary Information
Notes:
MH88422
2-23
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