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MH88510/11
Subscriber Line Interface Circuit (SLIC) Preliminary Information
Features
* * * * * * * * * * * * * * * High Gain version MH88511 Compatible with popular MH88500 Operates with a wide range of battery voltages Constant current battery feed Dry line compatible Overvoltage and short circuit protection Ringing Feed Off-hook detection and LED indicator drive Dial pulse detection Ring trip filter with auto ring trip Relay driver Transformerless 2-2 wire conversion Low power consumption Mute of incoming audio Few external components
ISSUE 1 April 1995
Ordering Information MH88510 MH88511 20 Pin SIL Package 20 Pin SIL Package 0C to 70C
Description
The Zarlink MH88510/11 Subscriber Line Interface Circuit provides a complete interface between the telephone line and a speech switch requiring only single bidirectional switch per crosspoint. The functions provided by the MH88510/11 include bidirectional differential to single ended conversion in the speech path, line battery feed, ringing feed and loop and dial pulse detection. The device is fabricated as a thick film hybrid which incorporates various technologies for optimum circuit board and very high reliability.
Applications
* * * * Line Interface for: PABX Intercoms Key Systems
TF TIP
Tip Drive 2-2 Wire Hybrid Current & Voltage Sensing
Constant Current/Voltage Control MUTE JUNC
Ring Trip Filter
RING RF
Ring Short Protection
Line Supervision
Relay Driver
VBAT AGND VDD VEE
SHK
LED
RRC
RRD VRLY RGND
Figure 1 - Functional Block Diagram
1
MH88510/11
Preliminary Information
TIP VDD RING RF TF VBAT AGND VEE LED SHK IC VDD AGND VBAT MUTE JUNCTOR RRD
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Figure 2 - Pin Connections
Pin Description
Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Name TIP VDD RING RF TF VBAT AGND VEE LED SHK IC VDD AGND VBAT MUTE JUNC RRD RGND RRC VRLY Description Tip Lead. Connects to the "Tip" lead (A-wire) of the telephone line. Positive Power Supply Voltage. Normally +5V. This provides current for both internal circuitry as well as the loop. Not internally connected to pin 12. Ring Lead. Connects to the "Ring" lead (B-wire) of the telephone line. Ring Feed. Connect to the Ring Relay contact. See Figure 5. Leave open circuit Battery Voltage Supply. Normally -24V or -48V. Not internally connected to pin 14. Analog Ground. Supply and battery ground. Internally connected to pin 13. For optimum performance connect pin 7 to pin 13. Negative Power Supply Voltage. Normally -5V. LED Drive (Output). Drives an LED directly. A logic low indicates an off-hook condition. Switch Hook Detect (Output). A logic low indicates an off-hook condition. Internal Connection. This pin is connected internally Positive Power Supply Voltage. Normally +5V. This provides current for both internal circuitry as well as the loop. Analog Ground. Supply and battery ground. Internally connected to pin 13. For optimum performance connect pin 13 to pin 7. Battery Voltage Supply. Normally -24V or -48V. Not internally connected to pin 6. MUTE (Input). A logic low will mute signals coming from Tip-Ring to the JUNC. Receive/transmit audio speech path. (Referenced to 0V GND). Ring Relay Drive (Output). Connects to the ring relay coil. A logic low activates the relay. Relay Ground. Return path for relay supply votlage. Normally connected to AGND. Ring Relay Control (Input). A logic high activates the Ring Relay Drive (RRD) outputs. Relay Positive Supply Voltage. Normally +5V. Connects to the relay coil and the relay supply voltage. An internal clamp diode from VRLY to RGND is provided.
2
Preliminary Information
Functional Description The BORSH Functions
The MH88510/11 performs all of the Borsh functions of Battery Feed, Overvoltage Protection, Ringing, Supervision and Hybrid (2-2 Wire).
MH88510/11
switches ringing voltage on to the line via the external ring relay. The SLIC provides two internal 300W battery feed resistors through which the ringing current will flow. A clamp diode is included which suppresses voltage transients during relay switching caused by the relay coil. In addition, the circuit prevents connection of the ringing source during off-hook conditions. See figure 5 for typical application.
Battery Feed Hybrid
The MH88510/11 powers the telephone set with constant DC loop current for shortlines and automatically reverts to constant voltage for long lines. Since the Tip drive is powered down from the VDD supply, loop current flows through both the VBAT supply and the VDD supply. The 2-2 Wire hybrid circuit converts the incoming balanced signal at Tip and Ring of the telephone line into a ground referenced output signal at JUNC of the SLIC, and converts the ground referenced input signal at JUNC of the SLIC into a non-balanced output signal at Tip and Ring of the telephone line.
Overvoltage Protection Line Impedance
The MH88510/11 is protected from short term (20ms) transients (+250V) between Tip and Ring, Tip and ground, and Ring and Ground. However additional protection circuitry may be needed depending on the requirements which must be met. Normally, simple external shunt protection as shown in Figures 5 and 6 is all that is required. The MH88510/11's Tip-Ring(Zin) impedance is fixed at 600 . For correct SLIC impedance, JUNC must be appropriately terminated. See AC Electrical Characteristics.
Supervision
The loop detection circuit determines whether a low enough impedance is across Tip and Ring to be recognised as an Off-Hook condition. When an offhook condition occurs, the SHK and LED outputs toggle to a logic low level. These outputs also toggle during incoming dial pulses.
Ringing
The ringing insertion circuitry has the capability to provide ringing voltage to the telephone set by simply adding an external relay, ring generator and a 200 limiting resistor. The internal relay driver
MH88510/11 SLIC 1
1 TIP TIP JUNC RING 3 RING CROSSPOINT SWITCH 16
75
MH88510/11 SLIC 2
1 TIP TIP JUNC RING 3 RING CROSSPOINT SWITCH 16
75
Figure 3 - SLIC Crosspoint Switch Connection
3
MH88510/11
Preliminary Information
In addition, the Tip-Ring Drive Circuit has the capability to drive a dry line (a line with no DC current flowing); the AC Electrical Characteristics apply (except for longitudinal balance), even when the loop current drops to zero. Therefore, the MH88510 has the capability to drive a line much longer than 2000 providing the user is not concerned with loop current, SHK detection or ringing generator current.
The SHK output has low drive capability while the LED output can drive an LED directly. The detection circuit engages a ringing filter during applied ringing. The ringing filter ensures that the SHK output toggles at the ringing cadence and not at the ringing frequency. The ring trip detection circuit also prevents false off-hook detection due to the current associated with the AC ringing voltage as well as current transients when the ringing votlage is switched in and out.
Short Circuit Protection Hybrid
The 2- wire hybrid circuit converts the incoming balanced signal at Tip and Ring of the telephone line into a ground referenced output signal at JUNC of the SLIC, and converts the ground referenced input signal at JUNC of the SLIC into a non-balanced output signal at Tip and Ring of the telephone line. The MH88510 is protected from long term (infinite) short circuit conditions occurring between Tip and Ring, Tip and AGND, and Ring and AGND.
Line Impedance
The MH88510's Tip-Ring (Zin) impedance is fixed at 600 . For correct SLIC impedance, JUNC must be appropriately terminated. See AC Electrical Characteristics.
Return Loss at Tip-Ring
To maximise return loss, the impedance at Tip-Ring should match the SLIC's impedance (600 ). However, the SLIC's input impedance is dependent on the JUNC termination resistance. For a 600 SLIC input impedance, the JUNC must be terminated with 754 . Figure 2 illustrates a typical connection between two SLICs through two crosspoint switches. Optimum return loss occurs when JUNC is terminated with 754 . Since the JUNC input/output is 604 and the crosspoint switches resistance are 75 + 75 , this configuration gives optimum return loss as shown in Figure 3.
Transmit and Receive Gain
Transmit Gain (JUNC to Tip-Ring) and Receive Gain (Tip-Ring to JUNC) are fixed. For correct gain, the SLIC input impedance must match the line impedance and JUNC must be appropriately terminated.
MUTE
A logic low at the MUTE input results on, muted signals coming from Tip and Ring to the JUNC terminal while allowing signals from the JUNC terminal to Tip and Ring to be transmitted.
Tip-Ring Drive Circuit
The audio input ground referenced signal at JUNC is converted to a differential output signal at Tip and Ring. The output signal consists of the audio signal superimposed on the DC battery feed current. The Tip-Ring drive circuit is optimsed for good 2-Wire longitudinal balance.
4
Preliminary Information
MH88510/11
TYPICAL RETURN LOSS (dB)
10 20 30 40 50 60 550 600 650 700 750 800 850 900 950
LOAD IMPEDANCE ON JUNCTOR ()
Figure 4 - Return Loss VS Junctor Load Impedance
TIP RING
1 OPTIONAL PROTECTION CIRCUIT 3
MH88510/11
TIP 16 RING JUNC 15 MUTE AUDIO INPUT/OUTPUT MUTE CONTROL INPUT SWITCH HOOK OUTPUT OFF-HOOK LED DS1 RING CONTROL INPUT K1
4 K1 R1
10 RF1 SHK 9 19 17
LED RRC
RINGING GENERATOR 90VRMS
~
-48V
6,14
RRD VBAT VRLY 20 VEE AGND VDD RGND
8
13
12
18
Notes:
R1= 200, 1/4W, 5% K1= Relay E/M 5V, 1 form C C1, C2 = 0.1uF, 50V, Ceramic -5V C1 C2 +5V
Figure 5 - Typical Application Circuit
5
MH88510/11
Preliminary Information
Absolute Maximum Ratings
Parameter 1 2 3 4 5 DC Supply Voltage DC Battery Voltage DC Relay Voltage AC Ring Generator Voltage Storage Temperature Characteristics 1 2 3 4 5 DC Supply Voltage DC Battery Voltage DC Relay Voltage AC Ring Generator Voltage Ringing Generator Frequency Operating Temperature TOP Sym VDD VEE VBAT VRLY 17 0 Min 4.75 -4.75 -23 TS Typ 5.0 -5.0 -48 5.0 90 Max 7.35 -8.40 -56 15 105 33 70 -55 Units V V V V V RMS Hz C Symbol VDD VEE VBAT VRLY Min -0.3 0.3 0.3 -0.3 Max 15 -15 -60 20 150 125 Units V V V V VRMS C
Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied.
Test Conditions
Typical figures are at 25 C with nominal+ 5V supplies and are for design aid only: not guaranteed and not subject to production testing.
DC Electrical Characteristics
Characteristics 1 Supply Current: Open Loop Sym
IDD IEE IBAT IDD IEE IBAT IDD IEE IBAT PC PC PC VOL VOH IOL IOH IOL ICD VIH VIL
Min
Typ
Max 15 15 15 43 15 43 43 15 43 880 2360 2360
Units mA mA mA mA mA mA mA mA mA mW mW mW V V mA mA
Test Conditions RLOOP = Open
Normal Loop
RLOOP = 1000
Short Loop
RLOOP = 0
2
Power Consumptionx: Open Loop Normal Loop Short Loop Low Level Output Voltage y High Level Output Voltage Sink Current, LED to AGND y Sink Current, LED to VDD Sink Current, Relay to VDD Clamp Diode Current High Level Input Voltage z Low Level Input Voltage {
RLOOP = Open RLOOP = 1000 RLOOP = 0 IOL = 2A IOH = 2A VOL = -1.5V VOL = 3.25V
3 4 5 6 7
-3.0 3.0 0.6 2.5
100 150
3.5 0.8
mA mA
V V
VOL = 0.35V IIL = 1.0mA IIL = 0.5mA
DC Electrical Characteristics are over recommended operating conditions with VDD at +5.0V and VEE at -5V 5% unless otherwise stated. Typical figures are at 25C with nominal+ 5V supplies and are for design aid only: not guaranteed and not subject to production testing. x Supply Current and Power Consumption characteristics are over recommended operating conditions with VDD at 5.0V, VEE at -5.0V and VBAT at -48V. Note that loop current flows through both the VBAT and the VDD supply. y SHK output consists of a 100k resistor in series with an op-amp with a minimum output voltage swing of 3.25V. z LED outputs consists of a 2.5k resistor in series with SHK op-amp output. RRC input consists of a 5kW resistor in series with the base lead of the relay driver transistor (grounded emitter). { The MUTE input is internally pulled up. With no input connection, the voltage level at the MUTE input is typically at 1.5V. 6
Preliminary Information
AC and DC Loop Electrical Characteristics*
Characteristics 1 2 3 Maximum AC Ringing Current Rejection x Ring Trip Detect Time Operating Loop Current VBAT = -48V VBAT = -23V Maximum Operating Loop Resistance y VBAT = -48V VBAT = -23V Loop Current at Off-Hook Detect Threshold
IIP RIP
MH88510/11
Test Conditions
Sym
Min 44
Typ
Max
Units mA
125 18 18 2000 600 ISH 8 9 10 11 12 13 23 23 28 28
ms mA mA A A RLoop < 2000 RLoop < 600 ILoop = 18mA ILoop = 18mA VDD = 5.0V, VEE = -5.0V VDD = 7.0V, VEE = -8.0V
4
5
* AC and DC Loop 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. x The SLIC can be loaded with an AC impedance as low as 2200 without generating a false SHK output. Since each REN represents 8k, the SLIC can drive a REN of 3.6 without generating a false SHK output. y See section on Tip-Ring Drive Circuit for driving longer lines.
AC Electrical Characteristics
Characteristics 1 2 3 4 5 Return Loss at 2-Wire Impedance at Junctor Longitudinal to Metallic Balance Longitudinal to Junctor Balance Signal Output Overload Level at 2-Wire at Junctor 6 Total Harmonic Distortion at 2-Wire at Junctor 7 Idle Channel Noise at 2-Wire at Junctor 8 Power Supply Rejection Ratio at 2-Wire and Junctor VDD VEE VBAT 9 Mute Attenuation 30 PSRR 25 25 25 dB dB dB dB Input 0.5V MUTE = 0.0V @1kHz Nc 12 12 dBrnc dBrnc Reference: 600 Reference: 754 Ripple 0.1V 1kHz THD 1.0 1.0 % % 3.5 3.5 dBm dBm 50 50 Sym Min 20 Typ 30 604 60 60 Max Units dB dB dB 40Hz - 4kHz 40Hz - 4kHz % THD < 5% Reference: 600 Reference: 754 Input 0.5V 1kHz Test Conditions Reference 600 @ 1kHz
Typical figures are at 25C with nominal + 5V supplies and are for design aid only.
7
MH88510/11
Preliminary Information
AC Gains Table - MH88510
Characteristics 1 2 3 4 Gain 2-Wire to Junctor Frequency Response Gain (relative to gain at 1kHz) Gain Junctor to 2-Wire Frequency Response Gain (relative to gain at 1kHz) Sym Min 1.05 0.42 -0.3 0.96 -0.35 -0.3 1.00 0.0 Typ 1.12 0.98 Max 1.19 1.51 0.3 1.04 0.35 0.3 Units V/V dBV dB V/V dBV dB Test Conditions Input 0.5V 1kHz Input 0.5V 1kHz 200Hz - 3400Hz Input 0.5V 1kHz Input 0.5V 1kHz 200z - 3400Hz
Typical figures are at 25C with nominal + 5V supplies and are for design aid only.
AC Gains Table - MH88511
Characteristics 1 2 3 4 Gain 2-Wire to Junctor Frequency Response Gain (relative to gain at 1kHz) Gain Junctor to 2-Wire Frequency Response Gain (relative to gain at 1kHz) Sym Min 1.15 0.21 -0.3 1.04 0.34 -0.3 1.08 0.67 Typ 1.19 1.50 Max 1.22 1.72 0.3 1.11 0.91 0.3 Units V/V dBV dB V/V dBV dB Test Conditions Input 0.5V 1kHz Input 0.5V 1kHz 200Hz - 3400Hz Input 0.5V 1kHz Input 0.5V 1kHz 200Hz - 3400Hz
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. Note1:All of the above test conditions use 754 connected between JUNC and GRD, and 600W connected between Tip and Ring unless otherwise stated. Note 2:All of the above test conditions use 200Hz to 6400Hz unless otherwise stated.
PROTECTION CIRCUIT TIP RV2
1
MH88510/11
TIP
RV3
3
RING
RV1 RING AGND 7 Notes RV1,2,3 = 175VAC, 225VAC, 15J GE V175LA2 or similar EARTH GROUND SYSTEM GROUND
Figure 6 - Typical Protection Circuit
8
Preliminary Information
MH88510/11
R7 LINE SEIZE C2
Q3
D8
+5V
VAR1 RELAY TIP R3 R1 C3 MH88511 Q1 J T1 Q2 D5 C6 VAR2 D9 +5V
D2
C4 D3 C5 D6 R4
R9
T
1 D1
D4
R5 R
3 C1
R6 R2 RING DET 5
1
D7 COMPONENTS D1,D2,=IN4732 D3,D4,D5,D6,D7=IN4003 D8=IN4148 D9=IN5246B VAR1,VAR2,VAR3-V130LA20A C1,C3=10F,60V,5% C2=1.0F,100V,5% C4=0.1F,100V,5% C5=0.01F,100V,5% C6=0.33F,200V,5% R1=1/4W,1%,6.8k R2,R5=1/4W,10%,10k
TIL111
2 R3=1/2W,10%,50 R4=1/4W,10%,680 R6=1/4W,10%,100k R7=1/4W,10%,1k R8,R9=1/2W,10%,10 Q1=MPSA90 Q2=ZN6716 Q3=BC238 T1=FIL TRAN TPF712(or EQUIVALENT) 600 :1
6
4
R8 RING
VAR3
Figure 7 - MH88511 as a Trunk Interface Application
MH88510
MT8816
MH88510
1dB 0dB 1dB
-2dB -1dB
0dB -1dB
Figure 8a - Line to Line
9
MH88510/11
Preliminary Information
T1
MH88511
MT8816
MH88510
C.O.
-0.2dB 1dB 0dB -0.2dB 1.2dB -2dB -0.7dB 0dB -0.7dB
Figure 8b- Line to Line
Side View
0.080 Max (2.0 Max)
2.00 + 0.020 (50.8 + 0.5)
0.58+0.02 (14.7+0.5)
1234
19 20
0.010 + 0.002 (0.25 + 0.05)
0.12 Max (3.1 Max) 0.05 + 0.01 (1.3 + 0.5) * 0.05 + 0.02 (1.3 + 0.05) 0.020 + 0.05 (0.51 + 0.13) * *
Notes: 1) Not to scale 2) Dimensions in inches). 3) (Dimensions in millimetres). *Dimensions to centre of pin & tolerance non accumulative.
0.18 + 0.02 (4.6 + 0.5)
0.100 + 0.10 (2.54 + 0.13)
Figure 9 - Mechanical Data
10
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