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MH88622
DUAL OPS SLIC Preliminary Information
Features
* * * * * * * * * * * * * * Dual SLIC Ringing generation On-hook transmission Transformerless 2-4 wire conversion Constant current feed Battery Feed to the line Tip Ring reversal capability Over current protection Off-Hook detection Logic interface for SHK, RC, LR, ESE, LCS Metering injection Wide V Bat operating range Minimum installation space ESE ramped output
ISSUE 3
April 1995
Ordering Information
MH88622 -1, -2, -3,-5 40 Pin SIL Package
0C to 70C
Description
The Mitel MH88622 is a Dual Subscriber Interface Circuit which provides a complete interface between the telephone lines a dual codec, requiring a dual rail supply, battery and dc supply for ringing generation. The functions provided by the MH88622 includes 2-4 Wire conversion, constant current line feed, signalling and control. The SLIC manufactured using thick film hybrid technology which offers high voltage capability, reliability and high density resulting in a significant area saving on the printed circuit board. A complete C.O. type solution can be implemented with minimal external components. Different variants are provided to meet different country line impedance, they are: -1 -2 -3 -5 220 + (820 // 115nF) 600 370 + (620 // 310nF) 200 + (680 // 100nF)
Applications
* * * Pair Gain CT2 Cordless local loops
SHK1
LCS1
LCS2
SHK2
Loop Supervision Over Current Protection & Constant Current Feed Over Current Protection & Constant Current Feed
Loop Supervision
LR1 TIP1 RING1 VX1 VR1 ESI1 ESE1
Line Drivers/ Feed
Line Drivers/ Feed
LR2 TIP2 RING2
2-4 Wire Conversion
Ring Generator
2-4 Wire Conversion
VX2 VR2 ESI2 ESE2
VDD VEE AGND
VBat DCRI RC1 RF1 RF2 RGV RG1 RC2
Figure 1 - Functional Block Diagram
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MH88622
Preliminary Information
TIP1 RING1 VBAT DCRI GND ESI1 ESE1 VR1 SHK1 LCS1 VX1 VEE GND VDD LR1 RC1 NC NC RF1 RF2
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
RGV RG1 NC NC RC2 LR2 VDD GND VEE VX2 LCS2 SHK2 VR2 ESE2 ESI2 GND DCRI VBat RING2 TIP2
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
Figure 2 - Pin Connections
Pin Description
Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Name TIP1 RING1 VBAT DCRI GND ESI1 ESE1 VR1 SHK1 LCS1 VX1 VEE GND VDD LR1 RC1 Description Tip Lead. Connects to the "TIP" lead of subscriber line 1. Ring Lead. Connects to the "RING" lead of subscriber line 1. Battery Voltage. Typically -48V dc is applied to this pin. This should be connected to pin 38 of the hybrid on the PCB. DC Ringing Voltage Input. A continuous 120V dc is applied to this input to achieve 90Vrms ringing. This should be connected to pin 37 of the hybrid. Ground. This pin should be tied to pins 13, 28 & 36 on the PCB. External Signal Input (Input). A continuous signal should be applied to this pin which will be switched to "Tip" and "Ring" of subscriber 1. External Signal Enable (Input). The external signal to the subscriber 1 is controlled by a logic level applied to this pin. Receive (Input). 4-Wire GND referenced audio input for subscriber 1. Off Hook Indication (Output). A logic low output indicates when subscriber 1 equipment has gone off hook. Loop Current Set 1. Logic 1 gives ILoop = 40mA, Logic 0 gives ILoop = 25mA Transmit (Output). 4-Wire, GND referenced audio output for subscriber 1. Negative Supply Voltage. -5Vdc. Connects to pin 29 of the hybrid on the PCB. Ground. Return path for VDD, VEE, VBat & DCRI. This pin should be connected to pins 5, 28 & 36 of the hybrid on the PCB. Positive Supply Voltage. +5Vdc. Connect to pin 27 of the hybrid on the PCB. Line Reversal. A logic 1 applied to LR1 will reverse the "Tip" and "Ring" to subscriber 1. This pin has an internal pull down. Ringing Control (Input). A logic level applied to this pin enables ringing to be applied across Tip and Ring of subscriber 1.
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Preliminary Information
Pin Description (Continued)
Pin # 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 Name NC NC RF1 RF2 RGV RG1 NC NC RC2 LR2 VDD GND VEE VX2 LCS2 SHK2 VR2 ESE2 ESI2 GND DCRI VBAT RING2 TIP2 Description No Connection. This pin should not be connected. No Connection. This pin should not be connected.
MH88622
Ringing Frequency Node 1 (Input). A capacitor is connected between RF1 & RF2 and determines the frequency of the ringing generator. Ringing Frequency Node 2 (Input). Two capacitors are connected between RF1& RF2 and from RF2 to AGND. This determines the frequency of the ringing generator. Ringing Gain Voltage. Connects to RG1 through a resistor to reduce the output ringing voltage. When left open circuit output ringing voltage is 90Vrms. Ringing Gain Node 1. Connects to RGV through a resistor to reduce the output ringing voltage. When left open circuit output ringing voltage is 90Vrms. No Connection. This pin should not be connected. No Connection. This pin should not be connected. Ringing Control (Input). A logic level applied to this pin enables ringing to be applied across Tip and Ring of subscriber 2. Line Reversal. A logic 1 applied to LR2 will reverse the "Tip" and "Ring" to subscriber 2. This pin has an internal pull down. Positive Supply Voltage. +5Vdc. This pin should be connected to pin 14 of the hybrid on the PCB. Ground. Return path for VDD, VEE, VBat & DCRI. This pin should be connected to pins 5, 13 & 36 of the hybrid on the pcb. Negative Supply Voltage. -5Vdc. This pin should be connected to pin 12 of the hybrid on the PCB. Transmit (Output). 4-Wire GND referenced audio input for subscriber 2. Loop Current Set 2. Logic 1 gives ILoop = 40mA, Logic 0 gives ILoop = 25mA. Off Hook Indication (Output). A logic high output indicates when subscriber 2 equipment has gone off hook. Receive (Input). 4-Wire GND referenced audio input for subscriber 2. External Signal Enable (Input). The external signal to subscriber 2 is controlled by a logic level applied to this pin. External Signal Input. A continuous signal should be applied to this pin which will be switched to "Tip" and "Ring" of subscriber 2. Ground. This pin should be tied to pins 5, 13 & 28 on the PCB. DC Ringing Voltage Input. A continuous 120Vdc is applied to this input to achieve 90 Vrms ringing. This should be connected to pin 4 of the hybrid on the PCB. Battery Voltage. Typically -48V dc is applied to this pin. This should be connected to pin 3 of the hybrid on the PCB. Ring Lead. Connects to the "Ring" lead of subscriber line 2. Tip Lead. Connects to the "Tip" lead of subscriber line 2.
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MH88622
Parameter 1 Supply Voltages - Referenced to VSS (GND) Symbol VEE VDD VDCRI VBat TAMB TS
Preliminary Information
Absolute Maximum Ratings *- All voltages are with respect to GNDA unless otherwise stated.
Min +0.3 -0.3 -0.3 -60 -40 -55 Max -15 +15 +180 0.3 +85 +125 Units V V V V C C
2 3
Operating Temperature Storage Temperature
* Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied.
DC Electrical Characteristics
Characteristics
1
Sym VEE VDD VDCRI VBat IEE IDD IDCRI IBat
Min -4.75 4.75 110 -60
Typ* -5 5 120 -48 30 30 15 5
Max -5.25 5.25 160 -20
Units V V V V mA mA mA mA V
Test Comments
Operating Loop Current S U P P L Y
2
Operating Supply Current (per Channel)
On-hook On-Hook Ringing (REN=1) Idle
3 4 5 6 7 8 9 10 11 12
I N P U T S
High Level Input Voltage LR, RC, ESE, LCS Low Level Input Voltage LR, RC, ESE, LCS High Level Input Current LR, RC, ESE, LCS Low Level Input Current LR, RC, ESE, LCS
VIH
4.5 0.5 700 10 0.4 4 4.75 0.4 23 25 27 500 1500
VIL IIH IIL IOH IOL VOH VOL ILoop RL
V A A mA mA V V mA LCS = 0 @ 25mA -24V @ 25mA -48V inclusive of telephone set Excluding PBAT & PDCRI
O U T P U T S
High Level Output Current SHK Low Level Output Current SHK High Level Output Voltage SHK Low Level Output Voltage SHK Constant Current Line Feed Maximum Operating Loop
13
Power Consumption
PC
300
mW
* Typical figures are at 25C with nominal +5V supplies and are for design aid only. Max & Min figures guaranteed over 0C to 70C only
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Preliminary Information
AC Electrical Characteristics*
Characteristics 1 Gain VR to 2-Wire Gain relative to Gain @ 1kHz 2 Gain 2-wire to VX Gain relative to Gain @ 1kHz 3 Off-Hook Detect Threshold 4 Transhybrid Loss 5 Ringing Signal Voltage 6 Ringing Frequency 7 Ringing Capability 8 Power Supply Rejection Ratio VBat VDD/VEE VDCRI 9 2-wire Return Loss 10 Longitudinal to Metallic Balance -1 Variant 20 PSRR 30 30 30 35 dB THL 22 40 17 4 68 -6.2 Sym Min -0.2 Typ 0 +0.15 -6 +0.15 7.5 30 mA dB 300-3.4kHz -5.8 dB Max Units +0.2 dB
MH88622
Test Comments Input 1.0Vrms 1kHz @ VR, Zload = Zin 300-3.4kHz Input 3dBm 1kHz @ 2W Zsource = Z in 300-3.4kHz
Vrms Min 65Vdc differential between DCRI & VBAT Hz dB See Table 1 Ripple 0.1 VPP 1kHz REN 1750 impedance @ 20Hz min.
Input 0.5 Vrms 1kHz across Tip & Ring Zload = Zin Input 0.5Vrms 50-300Hz 300-1000Hz 1k-4kHz 200Hz to 1kHz 3kHz 300Hz to 3k4Hz 300Hz to 600Hz 600Hz to 3k4Hz 200Hz to 1kHz 1kHz to 4kHz 1kHz @ 2-wire
-2 Variant -3 Variant -5 Variant Metallic to Longitudinal Balance -2 Variant only 11 Input AC Impedance (2- wire) -1 variant (220 + 820 // 115nF) -2 variant (600) -3 variant (370 + 620 // 310nF) -5 variant (200 + 680 // 100nF) 12 Input Impedance @ VR 13 Output Impedance @ VR 14 Total Harmonic Distortion at VX at Tip & Ring 15 Common Mode Rejection Ratio 2-Wire to VX 16 Idle Channel Noise at VX at 2-wire 17 On-Hook Transmission Signal Input Level Gain 18 External Signal Output Level CMRR NC THD
ZIN
40 55 53 58 53 46 40 46 60 40 600 900 700 823 230 10 0.2 0.2 40 60
dB dB dB dB dB dB dB dB dB dB
k % % dB dBrn C 2.0 Vrms VBat = -48V dB T-R load = 10k min. Vrms VBat = -48V T-R load = 200 Input 4dBm @2-Wire Input 1V at VR Input 0,5V, 1kHz
15 15 6 1.75 2.2
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MH88622
AC Electrical Characteristics* (Continued)
Characteristics 19 SHK Rise Time Fall Time 20 Analogue Signal Overload Level @ Tip & Ring 21 Ring Trip Delay 22 Outband Noise 23 Crosstalk Channel 1 to 2 Channel 2 to 1 No Sym tR tF 4 100 -70 -80 -80 Min Typ 1 1 Max Units ms ms dBm ms dB dB dB
Preliminary Information
Test Comments Dial Pulse Detection @ 1kHz
Refer to BS6305 section 4.1.4 & fig 3 for details of limits @ 1kHz
* AC 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. Max and Min figures guaranteed over 0C to 70C only. Notes: Impedance set to variant impedance Test conditions uses a Zin value as specified by variant number. Test conditions use a transmit and receive gain set to 0dB default and a Zin value of 600 unless otherwise stated.
.
VDCRI +5V VDD VEE -5V GND
VBat
VR1 VX1 RC1 LR1 ESE1 ESI1
CODEC SUBSCRIBER 1
LINE CONTROLLER LOGIC
SUBSCRIBER 1
TIP1
SHK1 SHK2 VR2 VX2 RING1 RC2 LR2 TIP2 ESE2 ESI2 DCRI RING2 RGV RG1 12/16kHz SOURCE CODEC SUBSCRIBER 2
SUBSCRIBER 2
CF1
RF1
RF2 CF2 120VDC SUPPLY
Figure 3 - Loop Start SLIC Configuration Application Circuit
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Preliminary Information
Functional Description
The SLIC uses a Transformerless 2-4 Wire converter for each subscriber which can be connected to a CODEC to interface the 2-Wire subscriber loop to a time division multiplexed (TDM), pulse code modulated (PCM), digital link. Powering of the subscriber line is provided through precision battery feed resistors on the hybrid. The thick film hybrid circuit contains control, signalling and status circuits which combine to provide a complete solution simplifying the manufacture of line cards.
MH88622
Two Wire Port Termination Impedance
The Tip/Ring impedance (Zin) is fixed for each variant. Transmit and Receive Gain The transmit and receive gain of the MH88622 is internally set.
Internal Ringing Generator
The MH88622 offers an on board ringing generator requiring only two external passive components and a DC voltage source to produce a sine wave of between 17Hz to 68Hz. An internal signal is amplified by a user programmed amount and is applied to Tip and Ring. The programmable gain must be set using RGV and RG1 to ensure that distortion of the ringing signal is minimised. With V BAT = -48Vdc and VDCRI = +120Vdc and the ringing voltage = 90Vrms RGV and RG1 should be left open circuit. By adding an external resistor between RGV and RG1 it is possible to reduce the ringing voltage applied by the driver section to Tip and Ring. The DC voltage source should be continuously applied to the MH88622. The ringing voltage will only be applied when the RC pin of the relevant subscriber is activated. Typ. Frequency (Hz) 17 25 35 50 CF1, CF2 (nF) 100 68 47 33
Approvals
FCC part 68, CCITT, DOS CS-03, UL 1459, CAN/ CSA-22.2 N0. 225-M90 and ANSI/EIA/TIA-464-A are system level safety standards and performance requirements. As a component of a system, the MH88622 is designed to comply with the applicable requirements of these specifications.
Battery Feed
The SLIC is designed for a nominal battery voltage of -48 Vdc and can provide the constant feed current for 1500 loop under this condition. The interface circuit is designed to be operated up to a maximum of -60V dc battery feed voltage without damage, providing a minimum loop length capability of 2000. There is also a function on the SLIC that provides for Tip-Ring reversal.
Current Limit
Primary over current protection is inherent in the current limiting feature of the battery feed circuit. Current limiting is provided for both Tip and Ring unbalanced conditions. The maximum loop current limit is set internally on the interface and current limiting does not affect the longitudinal or the signal balance of the device. To set ILoop to 40mA tie the LCS pin high (Logic 1), to set ILoop to 25mA the LCS pin may be left open circuit or tied low (Logic 0).
Table 1 - Ring Generator Capacitor Selection
12-16kHz Meter Pulse
The MH88622 provides control of an external signal path to the driver. A 12/16 KHz continuous signal should be applied to the ESI pin. Control of the ESE input allows the metering signal to be transmitted to the line with a ramped up and down amplitude to reduce noise on the line. Typical ramp time is 10mS.
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MH88622
Off-Hook and Dial Pulse Detection
The SHK pin goes low when e DC loop current exceeds a specified level. The threshold level is internally set by the bias voltage of the switch hook detect circuit. Dial pulse can be detected by monitoring the interruption rate at the SHK pin. These dial pulses may need to be debounced by the systems software.
Preliminary Information
High Voltage Capability
Inherent in the thick film process is the ability of the thick film process dielectric strengths of greater than 1000 VAC or 1500 VDC. The thick film process allows easy integration of surface mount components such as the high voltage bi-polar power transistor line drivers. This allows for simpler, less elaborate and less expensive protection circuitry required to handle high voltage transients and fault conditions caused by lightening, induced voltages and power line crossing.
Ring Trip Detection
The interface permits detection of an Off-Hook condition during ringing. If the subscriber set goes Off-Hook when the ringing signal has been applied, the DC loop current flow will be detected within approx. 100msecs and the SHK output will go low. The ringing is automatically disabled by the internal hardware.
On Hook Transmission
The MH88622 provides for on-hook transmission which supports features such as Automatic Number identifications (ANI).
Loop Length
The MH88622 can accommodate loop length of up to 2000 minimum (including the subscriber equipment).
Longitudinal Balance
Precision laser trimming of resistors in the hybrids ensures good overall longitudinal balance. The interface circuitry can operate in the presence of induced longitudinal currents of up to 40mA rms at 60Hz.
T
PROTECTION T PTC RESISTOR 5 Ohms TISP2290 or P2702AB R PTC RESISTOR 5 Ohms
R
Figure 4 - Typical Protection Circuit
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Preliminary Information
MH88622
4.2 + 0.03 (107 + 1)
Side View
0.25 Max (6.4 Max)
0.95 Max (24.13 Max
1
23
4
39 40
0.010 + 0.002 (0.25 + 0.05) 0.27 Max (6.9 Max)
* Notes: 1) Not to scale 2) Dimensions in inches). 3) (Dimensions in millimetres). *Dimensions to centre of pin & tolerance non accumulative. 0.05 + 0.02 (1.3 + 0.5) * 0.180 + 0.02 (4.6 + 0.5)
0.05 + 0.02 (1.27 + 0.5)
0.020 + 0.005 (0.51 + 0.13)
0.100 + 0.010 (2.54 + 0.26)
Figure 5 - Mechanical Data
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MH88622
Notes:
Preliminary Information
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