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MH88634B
Central Office Interface Circuit Advance Information
Features
* * * * * * * * * * * * Loop Start Trunk Interface 600 Input Impedance 2-4 Wire Conversion Line state Detection Outputs: - Forward Loop - Reverse Loop - Ringing Voltage - Switch Hook One Relay Driver On-Hook Reception Small footprint area Meets FCC Part 68 Leakage Current Requirements
DS5061 ISSUE 7 October 2001
Ordering Information MH88634BV-2 21 Pin SIL Package 0C to 70C
Description
The Zarlink MH88634-2 Central Office Interface Circuit trunk provides a complete analogue and signalling link between audio switching equipment and a telephone Line. The device is available in a single in line package for high packing densities or with a lead frame formed at 90 for low clearance applications. The device is fabricated as a thick film hybrid incorporating various technologies for optimum circuit design and very high reliability. This part supercedes the MH88634-2 and is pin for pin compatible. We advise that the B rev parts are fully tested. However, we do not expect to see changes between MH88634-2 and MH88634BV-2. The component design has been changed to improve the general performance of the part. It is also now capable of operating at a 24V battery.
Applications
Interface to Central Office for: * PABX * Key Telephone Systems * Channel Bank * Voice Mail * Terminal Equipment * Digital Loop Carrier * Optical Multiplexer
RV
FL
RL
SHK
XLA XLB XLC XLD
VCC
VEE
AGND
Status Detection
TIP Dummy Ringer RING LRC LRD Loop Relay Driver Line Termination 2 - 4 Wire Hybrid
Receive Gain
RX
Transmit Gain
TX
Impedance Matching
Network Balance
VRLY
Figure 1 - Functional Block Diagram
2-265
MH88634B
TIP RING XLA XLD XLB XLC IC IC IC SHK RX VEE TX RV FL RL VCC AGND LRC VRLY LRD
Advance Information
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
Figure 2 - Pin Connections
Pin Description
Pin # 1 2 3 4 5 6 7-9 10 Name TIP RING XLA XLD XLB XLC IC SHK Description Tip Lead. Connects to the "Tip" lead of a Telephone Line. Ring Lead. Connects to the "Ring" lead of a Telephone Line. Loop Relay Contact A. Connects to XLB through the Loop relay (K1) contacts when the relay is activated. Loop Relay Contact D. Connects to XLC through the loop relay (K1) contacts, when the relay is activated. Loop Relay Contact B. Connects to XLA through the loop relay (K1) contacts, when the relay is activated. Loop Relay Contact C. Connects to XLD through the loop relay (K1) contacts, when the relay is activated. Internal Connection. No connection should be made to this pin. Switch Hook (Output). A logic 0 indicates the presence of forward or reverse battery voltage when LRC is logic 0 and the presence of forward or reverse loop current when LRC is logic 1. Receive (Input). 4-Wire ground (AGND) referenced analog input. Negative Supply Voltage. -5V DC Transmit (Output). 4-Wire ground (AGND) referenced analog output. Ringing Voltage Detect (Output). A logic low indicates that ringing voltage is across the Tip and Ring leads. Forward Loop Detect (Output). In the on-hook state, a logic 0 output indicates that forward loop battery is present. In the off-hook state, a logic 0 indicates that forward loop current is present. Reverse Loop Detect (Output). In the on-hook state, a logic 0 output indicates that reverse loop battery is present. In the off-hook state, a logic 0 output indicates that reverse loop current is present. Positive Supply Voltage. +5V DC
11 12 13 14 15
RX VEE TX RV FL
16
RL
17
2-266
VCC
Advance Information
Pin Description (continued)
18 19 20 21 AGND LRC VRLY LRD
MH88634B
Analog Ground. 4-wire ground (AGND). Normally connected to system ground. Loop Relay Control (Input). A logic 1 activates the Loop Relay Driver output (LRD). Relay Positive Supply Voltage. Typically +5V. Connects to the relay supply voltage. Loop Relay Drive (Output). Connects to the Loop Relay Coil. When LRC is at a logic 1 an open collector output at LRD sinks current and energizes the relay.
Functional Description
The MH88634 is a Central Office Interface Circuit (COIC). It is used to correctly terminate a Central Office 2-wire telephone line. The device provides a signalling link and a 2-4 Wire line interface between the Telephone Line and subscriber equipment. The subscriber equipment can include Private Branch Exchanges (PBXs), Key Telephone Systems, Terminal Equipment, Digital Loop Carriers and Wireless Local Loops. All descriptions assume that the device is connected as in the application circuit shown in Figure 3.
Line Termination
When LRC is at a logic 1, LRD will sink current which energizes the Loop Relay (K1), connecting XLA to XLB and XLC to XLD. This places a line termination across Tip and Ring. The device can be considered to be in an off-hook state and DC loop current will flow. The line termination consists of a DC resistance and an AC impedance. When LRC is at a logic 0, the line termination is removed from across Tip and Ring. An internal Dummy Ringer is permanently connected across Tip and Ring which is a series AC load of (17k+330nF). This represents a mechanical telephone ringer and allows ringing voltages to be sensed. This load can be considered negligible when the line has been terminated. Depending on the Network Protocol being used the Line Termination can terminate an incoming call, seize the line for an outgoing call, or if applied and disconnected at the correct rate can be used to generate dial pulse signals. The DC line termination circuitry provides the line with an active DC load termination which is equivalent to a DC resistance of 280 at 20mA
Isolation Barrier
The MH88634 provides an isolation barrier which is designed to meet FCC Part 68 (November 1987) Leakage Current Requirements.
External Protection Circuit
An external Protection Circuit Device assists in preventing damage to the device and the subscriber's equipment, due to over-voltage conditions. The type of protection required is dependant upon the application and regulatorary standards. Further details should be obtained from the specific country's regulatorary body. Typically you will need lightening protection supplied by resettable fuses or PTCTM and mains crossover protection via a foldover diode.
Ringing Equivalent Number
The Ringing Equivalent Number (REN) is application specific. See the governing regulatory body specification for details.
Suitable Markets
The MH88634BV-2 has fixed 600 line and network balance impedance for use in North America and Asia.
Input Impedance
The input impedance (Zin) is the AC impedance that the MH88634 places across Tip and Ring to terminate the Telephone line. This is fixed at 600 on the -2 variant and 900R on the -4.
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MH88634B
Network Balance Impedance
The MH88634BV-2 Network Balance Impedance is fixed at 600.
Advance Information
Ringing Voltage Detect Output (RV) The RV output provides a logic 0 when ringing voltage is detected across Tip and Ring. This detector includes a filter which ensures that the output toggles at the ringing cadence and not at the ringing frequency. Typically this output switches to a logic 0 after 50ms of applied ringing voltage and remains at a logic 0 for 50ms after ringing voltage is removed. The threshold is different on the two variants. The 900R part has been designed to meet the ring sensitivity requirements of TR57, 30 not detecting ringin below 35Vrms. Forward Loop and Reverse Loop Detect Outputs (FL & RL) The FL output provides a logic 0 when either forward loop battery or forward loop current is detected, that is the Ring pin voltage is more negative than the Tip pin voltage. The RL output provides a logic 0 when either reverse loop battery or reverse loop current is detected, that is the Tip pin voltage is more negative than the Ring pin voltage. Switch Hook (SHK) The SHK output is active if either forward loop or reverse loop current is detected, or if forward or reverse battery voltage is detected. Control Input The MH88634 accepts a control signal from the system controller at the Loop Relay Control input (LRC). This energises the relay drive output Loop Relay Drive (LRD). The output is active low and has an internal clamp diode to VRLY. The intended use of this relay driver is to add and remove the Line Termination from across Tip and Ring, as shown in Figure 3. If this Control input and the Supervisory Features are used as indicated in Figure 3, Loop-Start Signalling can be implemented.
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 TX. This circuit operates with or without loop current; signal reception with no loop current is required for on-hook reception enabling the detection of Caller Line Identification (CLI) signals. Conversely the device converts the ground referenced signal input at RX, to a balanced 2-Wire signal across Tip and Ring. The 4-Wire side (TX and RX) can be interfaced to a filter/codec, such as the Zarlink MT896X, for use in digital voice switched systems 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 RX, being sent to the line, must not appear at the output TX. In order to prevent this, the device has an internal cancellation circuit. The measure of attenuation is Transhybrid Loss (THL). Transmit and Receive Gain The Transmit Gain of the device is the gain from the balanced signal across Tip and Ring to the ground referenced signal at TX. It is set at 0dB. The Receive Gain of the device is the gain from the ground referenced signal at RX to the balanced signal across Tip and Ring. It is set at -2dB.
Supervision Features
Line Status Detection Outputs The MH88634 supervisory circuitry provides the signalling status outputs which are monitored by the system controller. The supervisory circuitry is capable of detecting: Ringing Voltage; Forward and Reverse loop battery; Forward and Reverse loop current; and Switch Hook.
Mechanical Data
See Figure 9 specification. for details of the mechanical
2-268
Advance Information
MH88634 +5V Tip Protection Circuit Ring +5V 21 20 19 K1 2 RING 13 1 TIP VCC 17 C1
MH88634B
TX K1 LRD RX VRLY LRC RV 5 3 K1 XLB XLA FL RL SHK
Analog Out
11
Analog In
Loop Relay Control
14 15 16 10
Ringing Detect Forward Loop Reverse Loop Switch Hook
6 XLC 4 XLD
AGND VEE 18 C2 12 NOTES: 1) K1 Electro Mechanical 2 Form A 2) C1 and C2 are decoupling capacitors
-5V
Figure 3 - Typical LS Application Circuit
2-269
MH88634B
Absolute Maximum Ratings*
Parameters 1 2 3 DC Supply Voltages DC Ring Relay Voltage Storage Temperature Sym VCC VEE VRLY
TS
Advance Information
Min -0.3 0.3 -0.3 -55
Max 7 -7 18 +125
Units V V V C
Comments
4 Ring Trip Current ITRIP 180 mArms 250ms 10% duty cycle or 500ms *Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied.
single shot
Recommended Operating Conditions
Parameters 1 2 3 DC Supply Voltages DC Ring Relay Voltage Operating Temperature Sym VCC VEE VRLY TOP 0 Min 4.75 -4.75 Typ 5.0 -5.0 5.0 25 Max 5.25 -5.25 15 70 Units V V V C
Typical figures are at 25C with nominal 5V supplies and are for design aid only.
s
DC Electrical Characteristics
Characteristics 1 2 3 FL RL SHK RV LRD Supply Current Power Consumption Low Level Output Voltage High Level Output Voltage Sink Current, Relay to VCC Clamp Diode Current Low Level Input Voltage High Level Input Voltage High Level Input Current Low Level Input Current Sym ICC IEE PC VOL VOH 2.4 Min Typ 5 2.5 37.5 Max 13 13 137 0.5 Units mA mA mW V V VBAT not connected IOL = 4mA IOH = 0.4mA Test Conditions
4
IOL ICD VIL VIH IIH IIL
100 150 0.8 2.0 40 40
mA mA V V A A
VOL = 0.35V not continuous, LRC=5V
5 6
LRC LRC
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.
2-270
Advance Information
DC Electrical Characteristics
Characteristics 1 2 3 4 5 Ringing Voltage Operating Loop Current Off-Hook DC Resistance Leakage Current (Tip-Ring to AGND) SHK & FL Threshold Tip-Ring (On-hook) Tip-Ring Current (Off-Hook) SHK & RL Threshold Tip-Ring (On-Hook) Tip-Ring Current (Off-Hook) 12 5 12 -5 Symbol VR Min 40 16 270 Typ 90 Max 150 70 280 7 Units Vrms mA mArms
MH88634B
Test Conditions 17 to 68Hz @ 20mA Note 1
@ 1000VAC
21 15 21 -15
Vdc mA Vdc mA
LRC = 0V LRC = 5V LRC = 0V LRC = 5V
6
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: Maximum figure of 282 at 0C
2-271
MH88634B
AC Electrical Characteristics
Characteristics 1 2 3 2-wire Input Impedance Return Loss at 2-wire Longitudinal to Metallic Balance Symbol Zin RL 20 58 55 53 THL 20 -0.25 -0.3 -2.25 -0.3 29 60 60 58 27 0 0 -2 0 10 5 4.0 1.7 THD 1.0 1.0 NC at 2-Wire at TX 12 Power Supply Rejection Ratio at 2-wire and TX VCC VEE On-Hook Gain, 2-Wire to TX Relative to Off-Hook Gain Met. to Long. Balance 60 40 15 Common Mode Rejection Ratio CMRR 48 62 48 55 PSRR 25 25 -1 48 47 0 1 15 15 16.5 16.5 % % 0.25 0.3 -1.75 0.3 Min Typ 600 Max
Advance Information
Units dB dB dB dB dB dB dB dB dB k
Test Conditions Test Circuit as Fig 6 200-3400 Hz Test Circuit as Fig 7 200Hz 1000Hz 3400Hz 200-3400Hz Test Circuit as Fig 4 1000Hz 200-3400Hz Test Circuit as Fig 5 1000Hz 200-3400Hz
4 5
Transhybrid Loss Gain, 2 wire to TX Relative Gain
6
Gain, Rx to 2 wire Relative Gain
7 8 9
Input impedance at RX Output impedance at TX Signal Overload Level at 2-wire at TX Total Harmonic Distortion at 2-wire at TX
% THD < 5% @ 20mA dBm dBm Input 0.5V, 1kHz @ RX Input 0.5V, 1kHz @ Tip-Ring
10
11
Idle Channel Noise
dBrnC dBrnC Ripple 0.1V, 1kHz dB dB dB Input 1000Hz @ 0.5V Test Circuit as Fig. 8 200-1000Hz 1000-3400Hz dB Test Circuit as Fig. 7 1000Hz, FL = 0V, ILoop = 25mA
13 14
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.
2-272
Advance Information
-V +5V -5V 10H 300 VCC XLA XLB XLC XLD RING VEE 100uF I = 25mA +
MH88634B
~
100uF TIP + AGND 10H 300
Vs = 0.5V 600
Vtx V
TX RX
Gain = 20 * Log (Vtx/Vs)
Figure 4 - 2-4 Wire Gain Test Circuit
+5V
-5V
-V
VCC XLA XLB XLC XLD
VEE
10H 300 100uF RING I = 25mA +
VZ
Z = 600
TX RX Vs = 0.5V TIP AGND
100uF +
~
10H 300
Gain = 20 * Log (Vz/Vs)
Figure 5 - 4-2 Wire Gain Test Circuit
2-273
MH88634B
-V
Advance Information
+5V
-5V
10H 300 VCC XLA 100uF XLB XLC XLD V1 368 RING I = 25mA + 368 Vs = 0.5V 600 VEE
~
TX RX AGND TIP
100uF +
10H 300 Return Loss = 20 * Log (V1\Vs)
Figure 6 - Return Loss Test Circuit
+5V
-5V
-V
VCC XLA XLB XLC XLD
VEE
10H 300 100uF RING I = 25mA + 368
V1 Vs = 0.5V 368 Vtx VEX V TX RX AGND 10H 300 TIP 100uF +
~
Long to Met Bal. = 20 * Log (V1\Vs) CMRR = 20 * Log (Vtx\Vs) - ( 2-4W Gain)
Figure 7 - Longitudinal to Metallic Balance and CMRR Test Circuit
2-274
Advance Information
MH88634B
+5V
-5V
-V
VCC XLA XLB XLC XLD
VEE
10H 300 100uF RING I = 25mA + 368 Vs = 0.5V 510 V1
~
368
TX RX AGND 10H 300 TIP
100uF +
Met to Long Bal. = 20 * Log (V1\Vs)
Figure 8 - Metallic to Longitudinal Balance Test Circuit
0.13 Max (3.3 Max)
0.14 Max (3.6 Max)
2.120 Max (53.85 Max)
0.625 Max (15.9 Max)
1
0.180 + 0.020 (4.57 + 0.51)
0.010 + 0.002 (0.25 + 0.05) Notes:
*0.250+0.020 (6.35+0.51)
0.020 +0.005 (0.5 +0.13) * 0.100 + 0.010 (2.54 + 0.25)
1) Not to scale 2) Dimensions in inches. (Dimensions in millimetres) 3) Pin tolerances are non-accumulative. 4) Recommended soldering conditions: Wave soldering tempetature 260C for 10 secs. * Dimensions to centre of pin.
Figure 9 - Mechanical Data (SIL Package)
2-275
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