View MH88600_1279031.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

(R)
MH88600
Global SLIC Preliminary Information
Features
* * * * * * * * * * * * Programmable line impedance matching Internal complex impedance networks Transformerless 2-4 wire conversion Programmable transmit/receive gain Accommodates worldwide transmission standards Operates with a wide range of battery voltages Adjustable constant current battery feed Overvoltage and short circuit protection Switch hook and ground button detection Ring trip filter and relay driver Low power consumption High power dissipation capability during fault conditions MH88600
ISSUE 7
April 1995
Ordering Information 40 Pin DIL Hybrid 0C to 70C
Description
The MH88600 is a SLIC (Subscriber Line Interface Circuit) which provides all of the BORSCH functions of Battery Feed, Overvoltage Protection, Ringing Feed, Line Supervision and 2-4 Wire Hybrid conversion. In addition, the device matches the many different line impedances specified by regulatory authorities of around the world.
Applications
Line interface for: * PABXs * * * Control Systems Key Telephone Systems Central Office Equipment
VREF TF1 TF2 Tip Drive Constant Current Battery Feed Impedance Matching Network PG2 2-4 Wire Hybrid Circuit PG4 Gain Adjust TX PG3 PG1 LCA ZN14 ZN13.................ZN8 ZN7.....................ZN1 ZN0
TIP RING
Over Voltage & Short Circuit Protection
RF1
Ring Trip Filter Ring Drive Line Supervision Relay Driver
RF2
Vbat
EGB
SHK
Figure 1 - Functional Block Diagram
2-83
GNDBat
GNDA
VRR
VDD
VEE
RC
RD
MH88600
40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 ZN14 ZN13 ZN12 ZN11 ZN10 ZN9 ZN8 ZN7 ZN6 ZN5 ZN4 ZN3 ZN2 ZN1 TX PG3 PG1 PG2 PG4 ZN0
Preliminary Information
VBat RF1 RF2 RING TIP IC GNDBat TF2 TF1 GNDA VEE VDD VRR RC RD LCA SHK EGB VRef
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 VBat RF1
RF2
Name No pin at this location. Battery Supply Voltage (Negative).
Description
Ring Feed (1): Connect to relay contact. See Figures 6 & 7. Ring Feed (2). Connect to relay contact. See Figures 6 & 7. Connects to the "Ring" or "B" lead of the telephone line. Connects to the "Tip" or "A" lead of the telephone line. Internal Connection. Battery Supply Ground (Positive): Connect to System Ground Tip Feed (2). Connect to TF1 for unbalanced ringing, see Figure 6. Connect to relay contact for balanced ringing, see Figure 7. Tip Feed (1). Connect to TF2 for unbalanced ringing, see Figure 6. Connect to relay contact for balanced ringing, see Figure 7. Analog Ground: Normally connected to System Ground. Negative Power Supply Voltage: Normally -5V. Positive Power Supply Voltage: Normally +5V. Ringing Relay Clamp Diode: Connect to relay coil and to relay supply voltage (Positive). For +5V relay, connect to VDD. Ring Control (Input): A logic high will activate the Ring Relay Drive if SHK is high. Ring Relay Drive (Output). Connect to relay coil. A logic low will activate the relay by sinking current from VRR through the relay coil. Loop Current Adjust (Input): Loop current is proportional to the voltage at this input. Normally connected to VRef Switch Hook Detect (Output): A logic low indicates an off-hook condition. Earth Ground Button (Output): A logic low indicates a grounded Ring lead condition. Voltage Reference (Output): Normally connected to LCA for default loop current.
RING TIP I/C GNDBat TF2 TF1 GNDA VEE VDD VRR RC RD LCA SHK EGB VRef
2-84
Preliminary Information
Pin Description (Continued)
Pin # 21 22 23 24 25 26 27 Name
ZN0
MH88600
Description
Impedance Node 0. Connect to external network for impedance (Zin) setting. See Table 2 and Figure 8. Programming 4 (Input). Used for programmable gain and for default gain. Used as 4Wire Receive Input for default gain. See Table 3 and Figure 4 and 5. Programming 2 (Input). Used for programmable gain. Used with resistor for 4-Wire Receive Input. See Table 3 and Figure 4. Programming 1 (Input). Used for programmable gain. See Table 3 and Figure 4. Programming 3 (Input). Used for programmable gain and for default gain. See Table 3 and Figure 4 and 5. 4-Wire Transmit Output: Impedance Node 1: Connect to other Impedance Nodes for impedance (Zin) setting, see Table 1. Or, connect to external network for impedance (Zin) setting, see Table 2 and Figure 8. Impedance Node 2: Connect to other impedances Nodes for impedance (Zin) setting. See Table 1. Impedance Node 3: As per ZN2. See Table 1. Impedance Node 4: As per ZN2. See Table 1 Impedance Node 5: As per ZN2. See Table 1 Impedance Node 6: As per ZN2. See Table 1 Impedance Node 7: As per ZN2. See Table 1 Impedance Node 8: As per ZN2. See Table 1 Impedance Node 9: As per ZN2. See Table 1 Impedance Node 10: As per ZN2. See Table 1 Impedance Node 11: As per ZN2. See Table 1 Impedance Node 12: As per ZN2. See Table 1 Impedance Node 13: As per ZN2. See Table 1 Impedance Node 14: Connect to external network for impedance (Zin) setting. See Table 2 and Figure 8.
.
PG4 PG2 PG1 PG3 TX ZN1
28 29 30 31 32 33 34 35 36 37 38 39 40
ZN2 ZN3 ZN4 ZN5 ZN6
ZN7
ZN8 ZN9 ZN10 ZN11 ZN12 ZN13 ZN14
2-85
MH88600
Functional Description
The BORSH Functions The MH88600 performs all of the BORSH functions; Battery Feed, Overvoltage Protection, Ringing, Supervision and Hybrid. Battery Feed The MH88600 provides the loop with constant DC current to power the telephone set. The voltage (negative) applied at the LCA pin determines the magnitude of the lop current. ILoop = 3.731 x VLCA mA (2mA) Either the internal (VRef) or an external negative voltage reference may be used to set the loop current. Overvoltage Protection The MH88600 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 regulatory requirements which must be met. Normally, simple external shunt protection as shown in Figures 6,7 and 8 is all that is required. Ringing The MH88600 has the capability to accommodate both balanced and unbalanced ringing sources. Refer to Figure 7 for the Balanced Ringing Circuit and Figure 6 for the Unbalanced Ringing Circuit. Supervision The MH88600 is capable of detecting both Ground Button and Switch Hook conditions. The Ground Button detection (a logic low at the EGB output) operates when an imbalance in Tip and Ring DC current exceeds an internal threshold level caused by a grounded Ring Lead. Use of the EGB output is restricted to the off-hook condition of the telephone. The Switch Hook detection operates (a logic low at the SHK output) when the DC loop current exceeds an internal threshold level. The Ring Trip Detection Circuit prevents false offhook detection due to the current associated with the AC ringing voltage and also due to the large current transients when the ring voltage is switched in and out. In addition, the circuit prevents connection of the ringing source during off-hook conditions.
2-86
Preliminary Information
Hybrid The 2-4 Wire Hybrid circuit separates the balanced full duplex signal at Tip and Ring of the telephone line into receive and transmit ground referenced signals at RX (receive) and TX (transmit) of the SLIC. The Hybrid also prevents the input signal at RX from appearing at TX. The degree to which the Hybrid prevents the RX signal from appearing at TX is specified at transhybrid loss.
Tip-Ring Drive Circuit
The audio input ground referenced signal at RX is converted to a balanced output signal at Tip and Ring. The output signal consists of the audio signal superimposed on the DC Battery Feed Constant Current. The Tip-Ring Drive Circuit is optimised for good 2-Wire longitudinal balance.
Short Circuit Protection
The MH88600 is protected from long term (infinite) short circuit conditions occurring between Tip and Ring, Tip and Ground, Ring and Ground, and Ring and Battery. The current is limited to the same value as the Constant Current Battery Feed.
Programmable Line Impedance
The MH88600's Tip-Ring (Z in) impedance can be matched to the different impedances specified by different telephone administrations worldwide. This is accomplished by either linking specific pins as specified in Table 1, or by adding external components as shown in Figure 8 and Table 2.
Programmable Transmit & Receive Gain
Transmit gain (TX to Tip-Ring) and Receive Gain (Tip-Ring to RX) can be programmed by connecting external resistors as indicated in Figure 4 and Table 3. Alternatively, the default Receive Gain of -4d Band Transmit Gain of +4dB can be obtained by connecting pins as shown in figure 5 and Table3. Note that RX is not a pin on the SLIC. The RX terminal will be either PG4 or the connection to the receive gain programming resistor RRX shown in Figure 4 and Figure 5.
Preliminary Information
MH88600
Loop Current (mA)
VBat = -24V 25 20 VBat = -24V 15 Loop Detect Threshold 10 5
VBat =-48V
VBat = -48V
500
1000
1500
2000
Maximum Loop Length ()
Figure 3a - Loop Current vs.Maximum Loop Current
Maximum Loop Length ()
ILoop = 20mA 2000 1800 1600 1400 1200 1000 800 600 400 200 VBAT (V) ILoop = 25mA
16 20
24
28
32
36
40
44
48
52
56
60
64
Figure 3b - Maximum Loop Length vs Battery voltage
2-87
MH88600
Absolute Maximum Ratings* - Voltages are with respect to AGND.
Parameters 1 DC Supply Voltages Sym VDD VEE (GNDA = GNDBat) VBat VRR 2 3 Storage Temperature Power Dissipation TS PD
Preliminary Information
Min. -0.3 +0.3 +0.3 -0.3 -55
Max 15 -15 -80 40 125 4
Units V V V V C W
.
* Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied.
Recommended Operating Conditions
Characteristics 1 Operating Supply Voltage Sym VDD VEE VBat VRR 2 Operating Temperature TOP 0 Min. 4.75 -5.25 -72 Typ* 5.0 -5.0 -48 5 Max 5.25 -4.75 -24 24 70 Units V V V V C Comments
* Typical figures are at 25C and are for design aid only: not guaranteed and not subject to production testing.
2-88
Preliminary Information
MH88600
DC Electrical Characteristics
Parameters 1 Supply Current Sym IDD IEE IBat PC Min. Typ* 8.5 5.0 Max 12.0 10.0 4.8 330 755 1556 18 21 2000 800 1560 600 10 10 20 25 22 30 Units mA mA mA mW mW mW mA mA mA mA Test Conditions
RLoop=Open Cct, VBat = -48V Standby RLoop=1200 RLoop=0 VBat=-48V
LCA=-5.4V when RLoop-0 LCA=linked to VRef when RLoop=0 VBat =-48V, ILoop=20mA VBat =-48V, ILoop=20mA VBat =-48V, ILLoop=25mA VBat =-48V, ILoop=25mA
2
Power Consumption
3
Constant Current Battery Feed Operating Loop Resistance
ILoop ILoop RLoop
4
5 6 7 8 9 10 11 12 13 14
VRef RD SHK & EGB
Off-Hook Detect Threshold GND Button Detect Threshold Ring GND Over-Current Protection Low Level Output Voltage High Level Output Voltage Sink Current Source Current Low Level Input Voltage High Level Input Voltage High Level Input Current Sink Current Clamp Diode Current Internal Reference
SHKth EGBth
32 VOL VOH IOL IOH VIL VIH IIH IRLY ICD -7.4 -6.7 65 2.4 160 390
41 0.4
mA V V No Load VOL =0.8V VOH =-0.2V
RC
0.4 4.0 1.5
V V mA mA VIH = VDD
65 -6.0
mA V LCA linked to VRef
* Typical figures are at 25C and are for design aid only: not guaranteed and not subject to production testing. DC Electrical Characteristics are over recommended operating conditions unless otherwise stated. See Figures 3a and 3b.
2-89
MH88600
Preliminary Information
AC Electrical Characteristics - Voltages are with respect to GNDA unless otherwise stated.
Characteristics 1 2 3 4 5 6 Ringer Voltage Ringer Equivalence No. Ring Trip Detect Time Input Impedance at PG4 at VRX Output Impedance at TX Gain 2-Wire to TX: Fixed Gain Programmable Range Frequency Response Gain relative to Gain @ 1kHz 300Hz 600Hz and 2400Hz 3000Hz 3400Hz 7 Gain RX to 2-Wire: Fixed Gain Programmable Range Frequency Response Gain relative to Gain @ 1kHz 300Hz 600Hz and 2400Hz 3000Hz 3400Hz 8 9 10 11 12 2-Wire Return Loss 2-Wire Input Impedance Transhybrid Loss Longitudinal Balance Total Harmonic Distortion at TX at 2-Wire Common Mode Reject Ratio Idle Channel Noise at TX (0dB gain) Idle Channel Noise at 2-Wire (0dB gain) Power Supply Reject Ratio VDD VEE VBAT Dial Pulse Distortion (SHK High to Low Time) THD 0.1 0.1 CMRR Nc Np Nc Np PSRR 25 20 30 0.4 1 40 13 -78 11 -80 18 -73 16 -75 dBrnC dBrnp dBrnC dBrnp dB dB dB ms Ripple 1Vpp 1kHz Measure 2-Wire or TX 2-Wire loop at 1.2k 1.0 1.0 % %
Input 1.0V at 1kHz at 2-Wire Input 1.0V at 1kHz at PG4
Sym VR REN
Min.
Typ*
Max 105 5 200
Units Vrms
Test Conditions See Fig 6
ms k See Fig 5 See Fig 4
ZRX ZTX A TX RTX AR TX -0.75 -0.1 -0.3 -0.75 ARX RRX ARRX -0.75 -0.1 -0.3 -0.75 RL ZIN THL 20 52 41 20 18 -4.5 -12 +3.5 -12
112 RRX 3 +4 +4.5 +6
dB dB
Input 1.0V at 1kHz See Fig 5 See Figure 4 Input 1.0V
600 2-Wire Impedance 0.1 0.1 0.1 0.1 -4 -3.5 +6 dB dB dB dB dB dB
Input 1.0V at 1kHz See Fig 5 See Figure 4 Input 1.0V 600 2-Wire Impedance
0.1 0.1 0.1 0.1 26
dB dB dB dB dB dB
Input 1.0V, 200Hz to 3.4kHz Input 1.0V, 3.4kHz to 4kHz
See Table 1 40 dB dB dB
Input 1.0V at 300Hz to 3400Hz at PG4 40 - 3400Hz 3400-4000Hz
13 14
CCITT 0.121
15
16
td
AC Electrical Characteristics are over recommended operating unless otherwise stated. * Typical figures are at 25 C and are for design aid only: not guaranteed and not subject to production testing.
2-90
Preliminary Information
Table 1: Impedance Matching with Jumpers Zin Code 1 2 3 4 5 6 7 600 UK D NA F N A Zin 2-Wire Input Impedance 600 370 + 620 // 310nF 220 + 820 // 310nF 350 + 1000 // 310nF 210 +880 // 310nF 120 + 820 // 310nF 220 + 820 // 310nF Administration --United Kingdom Germany, Austria Canada, USA France Norway Australia ZN1 Link to: ZN7 ZN6 ZN5 ZN4 ZN3 ZN2 Use D Code
MH88600
ZN8 Link to: --ZN13 ZN12 ZN11 ZN10 ZN9 Use D Code
Note 1: The above impedances are as suggested by references: BS6305 (UK), REG3 (Australia), Proposed NET4, FCC Part 68 and recommendations by the various Administrations. Confirm your impedance requirements before proceeding. Note 2: All links to ZN1 should be as short as possible.
Table 2: Impedance Matching with External Components Zin Code 1 2 3 4 --ATT NTT NZ Zin 2-Wire Input Impedance 600 + 2.16F 900 + 2.16F 600 + 1.0F 370 + (620 // 220nF) Administration --AT&T NTT New Zealand Rs 6k 9k 6k 3.7k Rp 1M 1M 1M 6.2k Cp 216nF 216nF 100nF 22nF
Note 1: The above impedances are as suggested by reference CCITT Q.522. Confirm your impedance requirements before proceeding. Note 2: For Rs, Rp & C calculations, G is set to 10, R is set to 5656.8, refer to figure 8 for additional information.
Table 3: Transmit and Receive Gain Programming Transmit Gain (dB) +5.62 +4.0 +3.69 +2.1 0.0 -3.0 Transmit Gain (dB) +6.6 +0.0 -3.0 -3.69 4.0 -6.5 RTX Resistor Value () 270k No Resistor 216k 180k 141k 100k RTX Resistor Value () 33.1k 70.7k 100k 108k No Resistor 150k
Results in 0dB overall gain when used with Mitel A-law codec (ie. MT8964) Results in 0dB overall gain when used with Mitel -law codec (ie MT8965) Results in 0dB overall gain when used with Mitel A-law codec (ie MT8965) Results in 0dB overall gain when used with Mitel -law codec (ie MT8964)
Notes
Notes
Note 1: See Figures 4 and 5 for additional details. Note 2: Overall gain refers to the receive path of PCM to 2-Wire, and to transmit path of 2-Wire to PCM.
2-91
MH88600
Preliminary Information
RTX
24 PG1 TX 26 VTX TRANSMIT TX 25 PG3
MH88600
PG4
22
PG2
23 RRX
VRX RECEIVE RX Transmit Gain = VTx = RTX (k)x0.007071 VTIP - RING 70.71 RRX (k)
GNDA 11
Receive Gain = VTIP - RING VRX
=
Note: PG3 and PG4 pins should be left open circuit. See Table 3.
Figure 4 - Configuration of MH88600 for Gain Programming
24 PG1 TX 26 V TX TRANSMIT TX 25 PG3
MH88600
PG4
22
VRX RECEIVE RX
PG2
23 VTX Transmit Gain = VTIP - RING
= +4dB
GNDA 11 Receive Gain = VTIP - RING VRX = -4dB
Note: PG2 pins should be left open circuit. See Table 3.
Figure 5 - Configuration of MH88600 for Default Gains
2-92
Preliminary Information
MH88600
39 RV1 10 9 ZN13 TF1 TF2
34 ZN8
32 ZN6
27 ZN1 PG3 25
TX 6 TIP TO MDF and SUBSCRIBER SET
26
VX
MH88600
CODEC
5 RING PG4 4 RF2 22 VR
RV2
K1 3 K1 16 RF1 RD EGB K1 14 SHK
GNDA
19 18
VDD
VRef
90VRMS 20Hz
~
15 17 20 13
LCA
12
2
VBat
RC
VEE
RINGING GENERATOR
+ve RELAY SUPPLY
VRR
11
8
RINGING CONTROL
C1 -5V +5V
C2
GNDBat
RV1,RV2 - V150LA 150Vrms 13J (10/1000) C1,C2 K1 10 F/10V Electrolytic or Tantalum Relay E/M, 12V, 1Form C
Figure 6- Typical Application Circuit
2-93
MH88600
Preliminary Information
39 RV1 30k 0.15W 9 ZN13 TF1
34 ZN8
32 ZN6
27 ZN1 PG3 25 26
K1
10 TF2 6 TIP TX
MH88600
TO MDF and SUBSCRIBER SET
5 4
RING PG4 RF2 RF1 RD EGB SHK
GNDA GND Bat
22
RV2 3 16 K1 14 RINGING GENERATOR 45 VRMS + 45VRMS 20Hz +ve RELAY SUPPLY
K1
19 18
VRR
VRef VDD LCA VBat VEE RC
20Hz
~
~
-48V
15 17 20 13
12
2
11
8
RINGING CONTROL
C1 -5V +5V
C2
Figure 7 - Application Circuit for Balanced Ringing
2-94
Preliminary Information
MH88600
C1=C2=10F, 10V Electrolytic or tantalum C3=1nF, 250V, 20% C3 is recommended to improve stability when RV1 used on loop lengths less than 500 total or used with active loads Z=G x Zo R=565.68 x G G may be chosen to Zo suit preferred component values (useful for capacitive elements); resistive elements should have values in the range of 1k to 1M. Typical values RV2 are G = 10 See Table 2 for external network examples. Set Rp=1M for networks not specifying an Rp RINGING GENERATOR 90VRMS 20Hz +ve RELAY SUPPLY
External Network Z R 40 ZN13 10 TF1 9 TF2 TX 6 C3 5 4 K1 3 K1 16 K1 14 VRR
GNDA VRef VDD VBat LCA VEE RC
27 ZN8 ZN6
21 ZN1 PG3 25 26
VX
TIP
MH88600
CODEC
RING RF2 RF1 RD
PG4
22
VR
EGB SHK
GNDBat
19 18
~
15 17 20 13
12
2
11
8
RINGING CONTROL Cp Z = Rp Rs
C1 -5V +5V
C2
Figure 8 - Using an External Network to Match any Zo
2-95
MH88600
Preliminary Information
2.0 (50.8)
AAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAA
0.3 (7.62)
1.0 (25.4) Note 2 0.10 + 0.01 (2.54 + 0.25)
Note 4
MH88600
AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA
0.09 (2.3) 0.260 (6.6)
Note 1 0.020 + 0.002 (0.51 + 0.051) Notes: 1) Pin 1 not fitted. 2) Row pitch is to the centre of the pins. 3) All dimensions are typical and in inches (mm). 4) Seated Height 5) Not to scale
Figure 9 - Mechanical Data
2-96

▲Up To Search▲

Price & Availability of MH88600

	To Download MH88600 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .