Datasheet MH88600 Datasheet (MITEL)



MH88600

Global SLIC

Preliminary Information

Features

• Programmable line impedance matching

• Internal complex i mp edance netw ork s

• Transformerless 2-4 wire conversion

• Programmable transmit/receive gain

• Accomm odat es worl dw ide trans miss ion standards

• Opera tes with a wide range of ba tte ry volt ages

• Adjustab le c onsta nt curre nt ba ttery feed

• Overvol tag e and sho rt circu it pro tectio n

• Switch hoo k an d groun d bu tton de tectio n

• Ring tri p filte r and rel ay d river

• Low pow er co nsump tion

• High power dissipation capability during fault conditions

Applications

Line interface for:

• PABXs

• Contr ol Sys tems

• Key Telephone Sy stems

• Central Office Equipment

ISSUE 7 April 1995

Ordering Information

MH88600 40 Pin DIL Hybrid

0°C to 70°C

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.

TF1 TF2

TIP

RING

RF1

RF2

Tip Drive

Over Voltage &

Short Circuit

Protection

Ring Drive

VREF

Constant

Current

Battery Feed

LCA

ZN14

Line Supervision

EGB

SHK

ZN13.................ZN8

Impedance Matchi ng Network

2-4 Wire

Hybrid Circuit

Ring Trip Filter

Relay Driver

RC

ZN7.....................ZN1

RD

Figure 1 - Functional Block Diagram

Gain Adjust

VRR

GNDA

VDD

ZN0

PG2

PG4

TX

PG3 PG1

VEE

Vbat

GNDBat

2-83

MH88600 Preliminary Information

40

ZN14

39 38 37

36 35

34 33 32 31 30 29 28 27 26 25 24 23 22 21

ZN13 ZN12 ZN11 ZN10 ZN9 ZN8 ZN7 ZN6 ZN5 ZN4 ZN3 ZN2 ZN1 TX PG3 PG1 PG2 PG4 ZN0

Pin Description

TIP

IC

RC RD

2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

VBat

RF1 RF2

RING

GNDBat

TF2 TF1

GNDA

VEE VDD VRR

LCA

SHK

EGB VRef

Figure 2 - Pin Connections

Pin # Name Description

1 No pin at this location. 2V

Bat

Battery Supply Voltage (Negati ve).

3RF1Ring Fe e d ( 1 ): Conne ct to relay contact. See Figures 6 & 7. 4

RF2

Ring Fe e d ( 2 ). Connect to relay contact. See Figu res 6 & 7. 5 RING Connects to the “Ring” or “B” lead of the telephone line. 6 TIP Connects to the “Tip” or “A” lead of the telephone line. 7I/CInternal Connection . 8GND

Battery Supply Ground (Positive ): Connect to System Ground

Bat

9TF2Tip Feed (2). Connect to TF1 for unbalanced ringing, see Figure 6. Connect to relay

contact for balanced ringing, see Figure 7.

10 TF1 Tip Feed (1). Connect to TF2 for unbalanced ringing, see Figure 6. Connect to relay

contact for balanced ringing, see Figure 7.

11 GNDA Analog Ground: Normally connected to System Ground. 12 V 13 V 14 V

EE DD RR

Negative Power Supp ly Voltage: Normally -5V. Positive Pow er Su pp ly Voltage: Normally +5V. Ringing Relay Cl am p Di ode : Connect to relay coil and to relay supply voltage

(Positive). For +5V relay, connect to VDD. 15 RC Ring Control (Input): A logi c hig h will activat e the Ri ng Relay D rive if SHK is high. 16 RD

Ring Relay Drive (Outpu t ). Connect to relay coil. A logic low will activate the relay by

sinking current from VRR through the relay coil. 17 LCA Loop Current Adjust (Input): Loop current is prop ortio nal to the vol tage at this input.

Normally connected to VRef 18 SHK Switch Hook Detect (Output): A logic low indicates an off-hook condition. 19 EGB 20 V

2-84

Ref

Earth Ground Button (Output ): A logic low indicates a grounded Ring lea d condition.

Voltage Reference (Output): Normally connected to LCA for default loop current.

Preliminary Information MH88600

Pin Description (Contin ue d)

Pin # Name Description

21

ZN0

Impedance Node 0. Connect to external network for impedance (Zin) setting. See Table 2 and Figure 8.

22 PG4 Programming 4 (Input). Used for programmable gain and fo r default gain. Used as 4-

Wire Receive Input for default gain. See Table 3 and Figure 4 and 5.

23 PG2 Programming 2 (Input). U sed for programmab le gain. Used with resistor for 4-Wire

Receive Input. See Table 3 and Figure 4. 24 PG1 Programming 1 (Input). Used for programmable gain. See Table 3 and Figure 4. 25 PG3 Programming 3 (Input). Used for programmable gain and for default gain. See Table 3

and Figure 4 and 5. 26 TX 4-Wire Transmit Output: 27 ZN1 Impedance Node 1: Connect to other Impedance Nodes for impe dance (Z

see Table 1. Or , connect to external network for impedance (Z

) setting, see Table 2 and

in

) setting,

in

Figure 8. 28 ZN2 Impedance Node 2: Connect to other impedances Nodes for im pedance (Zin) setting.

See Table 1. 29 ZN3 Impedance Node 3: As per ZN2. S ee Table 1. 30 ZN4 Impedance Node 4: As per ZN2. S ee Table 1 31 ZN5 Impedance Node 5: As per ZN2. S ee Table 1 32 ZN6 Impedance Node 6: As per ZN2. S ee Table 1 33

ZN7

Impedance Nod e 7: As per ZN2. See Table 1 34 ZN8 Impedance Node 8: As per ZN2. S ee Table 1 35 ZN9 Impedance Node 9: As per ZN2. S ee Table 1 36 ZN10 Impedance Nod e 1 0: As per ZN2. See Table 1 37 ZN11 Impedance Nod e 11: As per ZN2. See Table 1 38 ZN12 Impedance Nod e 1 2: As per ZN2. See Table 1 39 ZN13 Impedance Nod e 1 3: As per ZN2. See Table 1

40 ZN14 Imp eda nce Nod e 14 : Connect to external net work for impedance (Z

Table 2 and Figure 8.

) setting. See

in

.

2-85

MH88600 Preliminary Information

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.

I

= 3.731 x VLCA mA (±2mA)

Loop

Either the internal (V voltage reference may be used to set the loop current.

Overvol tage P rote ction

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 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 restricted to the off-hook condition of the telephone. The Switch Hook detection operates (a logic low at the SHK an interna l th reshold level .

output) when the DC loop current exceeds

) or an external negative

Ref

output)

output is

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 Batte ry. The current is lim ited to the sam e v alue as the Constant Current Battery Feed.

Programmable Line Impedanc e

The MH88600’s Tip-Ring (Zin) 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 G ain

Transmit gain (TX to Tip-Ring) and Receive Gain (Tip-Ri ng to RX) c an be prog ram med by conn ectin g 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.

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 , th e circu it pr ev e nt s con ne c ti on of the ringing source during off-hook conditions.

2-86

Preliminary Information MH88600

Loop Current (mA)

25

20

15

Loop Detect Threshold

10

5

Maximum Loop Length (Ω)

2000

VBat = -24V VBat =-48V

VBat = -24V

500

1000 1500

VBat = -48V

2000

Figure 3a - Loop Current vs.Maximum Loop Current

ILoop = 20mA

Maximum Loop Length (Ω)

1800

1600

1400

1200 1000

800

600

400

200

ILoop = 25mA

64

16

20

24

28

32

36

40

44

48

52

56

60

Figure 3b - Maxim um L oop L ength vs Batt ery vo ltag e

VBAT (V)

2-87

MH88600 Preliminary Information

Absolute Maximum Ratings* - Voltages are with respect to AGND.

Parameters Sym Min. Max Un its

1 DC Supply Voltages

(GNDA = GND

Bat

)

2 Storage Temperature T 3 Power Dissipation P

* Exceeding these values ma y cause perm anen t dama ge. Functi onal operati on und er these cond ition s is not implied.

V

DD

V

EE

V

Bat

V

RR

S

D

-0.3 15 V +0.3 -15 V +0.3 -80 V

-0.3 40 V

-55 125 °C

Recommended Operating Conditions

Characteristics Sym Min. Typ

1 Operating Supply Voltage V

2 Operating Temperature T

* Typical figures are at 25°C and are for design aid only: not guaran teed an d not subject to producti on testing .

DD

V

EE

V

Bat

V

RR

OP

4.75 5.0 5.25 V

-5.25 -5.0 -4.75 V

-72 -48 -24 V

070°C

*

Max Units Comments

524 V

4W

.

2-88

Preliminary Information MH88600

DC Electrical Characteristics †

Paramete rs Sym Min. Typ* M ax Units Test Con dition s

1 Suppl y Current I

I I

DD EE Bat

8.5

5.0

12.0

10.0

4.8

2 Power Consum ption PC 330

755

1556

3 Constant Current

Battery Feed

4 Op erating Loop

Resistance

‡

I

Loop

‡

I

Loop

R

Loop

18 21

2000

20 25

22 30

800

1560

600 5 Off-Hook Detect Threshold SHK 6 GND Button Detect

Threshold

EGB

th

10 mA 10 mA

7 Ring GND Over-Current

Protection 32 41 mA

SHK

8

EGB

9 Sink Current

Low Level Output Voltage

&

High Level Output Voltage

Source Current

10

RC

Low Level Input Voltage

High Level Input Voltage 11 High Level Input Current I 12

RD

Sink Current I 13 Clamp Diode Current I

V

14

Internal Reference -7.4 -6.7 -6.0 V LCA linked to V

Ref

V

I I

V V

OL

OH

OL

OH

IH

RLY

CD

2.4

160 390

IL

4.0

65 mA

0.4 V

1.5 mA VIH = V

65 mA

mA mA mA R

mW mW mW

mA mA

Ω Ω Ω Ω

=Open Cct,

Loop

= -48V

V

Bat

Standby

=1200Ω

R

Loop

=0Ω

R

Loop

=-48V

V

Bat

LCA=-5.4V when R LCA=linked to V R

=0Ω

Loop

V

=-48V, I

Bat

V

=-48V, I

Bat

V

=-48V, I

Bat

V

=-48V, I

Bat

No Load

V

µΑµΑVOL =0.8V

=-0.2V

V

OH

V

DD

Loop Loop LLoop Loop

Loop

Ref when

=20mA =20mA

=25mA

Ref

-0Ω

* Typical figures are at 25°C and are for design aid only: not guaran teed and no t subject to producti on 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.

Characteristi cs Sym Min. Typ*Max Units Test Conditions

1 Ringer Voltage VR 105 V

rms

2 Ringer Equivalence No. REN 5 3 Ring Trip Detect Time 200 ms 4 Input Impedance at PG4

at VRX 5 Output Impedance at TX Z 6 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 Ga in

Programmable Range Frequency Response Gain relative to Gain @ 1kHz

300Hz 600Hz and 2400Hz 3000Hz 3400Hz

Z

RX

112

RRX

TX

3 Ω

A TX +3.5 +4 +4. 5 dB

RTX -12 +6 dB

AR TX

-0.75

-0.1

-0.3

-0.75

0.1

ARX -4. 5 -4 -3.5 dB

RRX -12 +6 dB

ARRX

-0.75

-0.1

-0.3

-0.75

0.1

kΩ See Fig 5

dB dB dB dB

See Fig 6

See Fig 4

Input 1.0V at 1kHz See Fig 5 See Figure 4 Input 1.0V

600Ω 2-Wire Impedance

Input 1.0V at 1kHz See Fig 5 See Figure 4 Input 1.0V

600Ω 2-Wire Impedance

8 2-Wire Return Loss RL 20

18

9 2-Wire Input Impe dance Z

IN

26 dB

dB

10 Transhybrid Loss THL 20 40 dB

11 Longitudi nal Balance 52

41

12 Total Harmonic Distortion

THD at TX at 2-Wire

0.1

1.0

dB dB

% %

Input 1.0V, 200Hz to 3.4kHz Input 1.0V, 3.4kHz to 4kHz

See Table 1

Input 1.0V at 300Hz to 3400Hz at PG4

40 - 3400Hz 3400-4000Hz

Input 1.0V at 1kHz at 2-Wire Input 1.0V at 1kHz at PG4

13 Common Mode Reject Ratio CMRR 40 CCITT 0.121 14 Idle Channel Noise at TX

(0dB gain) Idle Channel Noise at 2-Wire (0dB gain)

15 Power Supply Reject Ratio V

V

16 Dial Pulse Distortion

V

DD

EE

BAT

Nc Np Nc Np

PSRR 25

20 30

t

d

13

-78 11

-80

18

-73 16

-75

dBrnC

dBrnp

dBrnC

dBrnp

dB dB

Ripple 1Vpp 1kHz Measure 2-Wire or TX

dB

0.4 1 ms 2-Wire loop at 1.2kΩ

(SHK High to Low Time)

† AC Electrical Characteristics are over recommended operating unless otherwise stated. * Typical figures are at 25 C and are for design aid only: not guarantee d and not subject to productio n testi ng.

2-90

Preliminary Information MH88600

Table 1: Impedance Matching with Jumpers

Zin Code Zin 2-Wire Inpu t Imped ance Administration ZN1 Link to: ZN8 Link to:

1600600Ω --- ZN7 --- 2UK370Ω + 620Ω // 310nF U n ited Kingdom ZN6 ZN13 3D220Ω + 820Ω // 310nF Germany, Austria Z N5 ZN12 4NA350Ω + 1000Ω // 310nF Canada, USA ZN4 ZN11 5F210Ω +880Ω // 310nF France ZN3 ZN10 6N120Ω + 820Ω // 310nF Norway ZN2 ZN9 7A220Ω + 820Ω // 310nF Australia Use D Code 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 Zin 2-Wire Input Imp edan ce Ad m inistratio n Rs Rp Cp

1 --- 600Ω + 2.16µF---6kΩ1MΩ 216nF 2 ATT 900 Ω + 2.16µ FAT&T9kΩ1MΩ 216nF 3 NTT 600Ω + 1.0µFNTT6kΩ1MΩ 100nF 4NZ370Ω + (620Ω // 220nF) New Zealand 3.7kΩ 6.2kΩ 22nF

Note 1: The above impedances are as suggested by reference CCITT Q.522. Confi rm your impedan ce require ment s before proce edin g. Note 2: For Rs, Rp & C calculations, G is set to 10, R is set to 5656.8Ω, refer to figure 8 for additional information.

Table 3: Transmit and Receive Gain Programming

Transmit Gain

(dB)

RTX Resistor

Value (Ω)

Notes

+5.62 270k

+4.0 No Resistor

+3.69 216k

Results in 0dB overall gain when used with Mitel A-law codec (ie MT8965) Results in 0dB overall gain when used with Mitel µ-law codec (ie MT8964)

+2.1 180k

0.0 141k

-3.0 100k

Transmit Gain

(dB)

RTX Resistor

Value (Ω)

Notes

+6.6 33.1k +0.0 70.7k

-3.0 100k

-3.69 108k

4.0 No Resistor

Results in 0dB overall gain when used with Mitel A-law codec (ie. MT8964) Results in 0dB overall gain when used with Mitel µ-law codec (ie MT8965)

-6.5 150k

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

MH88600

TX

PG3

PG4

25

22

26

V

TX

TRANSMIT

TX

24

PG1

MH88600

GNDA

11

PG2

23

R

RX

V

RECEIVE

RX

Transmit Gain =

Receive Gain =V

Note: PG3 and PG4 pins should be left open circuit. See Table 3.

V

Tx

V

-

TIP

TIP - RING

V

RX

RING

Figure 4 - Configuration of MH88600 for Gain Programming

26

TX

PG3

PG4

25

22

TRANSMIT

V

TX

V

RECEIVE

RX

TX

RX

= RTX (kΩ)x0.007071

70.71

=

R

(kΩ)

RX

2-92

GNDA

11

23

PG2

Transmit Gain =

Rece ive Gain =

Note: PG2 pins should be left open circuit. See Table 3.

V

TIP - RING

V

TIP - RING

V

RX

Figure 5 - Configuration of MH88600 for Default Gains

TX

= +4dB

-4dB

=

Preliminary Information MH88600

RV1

TO MDF and

SUBSCRIBER SET

RV2

RINGING

GENERATOR

90VRMS 20Hz

K1

~

K1

RELAY

SUPPLY

+ve

K1

14

16

10

15

LCA

20

34

ZN8

MH88600

VDD

VRef

32 27

ZN6

VEE

VBat

21213

ZN1

PG3

EGB SHK

GNDA

TX

PG4

811

25

26

22

19 18

Bat

GND

VX

CODEC

VR

39

ZN13 TF1

9

TF2

6

TIP

5

RING

4

RF2

3

RF1

RD

VRR

RC

17

RINGING

CONTROL

C1

+5V-5V

C2

RV1,RV2 - V150LA 150Vrms

C1,C2 - 10µ F/10V Electrolytic or Tantalum K1 - Relay E/M, 12V, 1Form C

Figure 6- Ty pical Application Circuit

13J (10/1000)

2-93

MH88600 Preliminary Information

RINGING

GENERATOR

45 V

RMS

20Hz

+-

~

RV1

TO MDF and

SUBSCRIBER SET

RV2

45V

RMS

20Hz

~

K1

30k

0.15W

K1

+ve

RELAY

SUPPLY

9

10

6

5

4

3

16

K1

14

15

39 34

ZN13

TF1

TF2

TIP

RING

RF2

RF1

RD

VRR

RC

VRef

LCA

20

17

ZN8

MH88600

VEE

VDD

1213

32

ZN6

27

ZN1

25

PG3

26

TX

22

PG4

19

EGB

18

SHK

Bat

GND

GNDA

VBat

8112

-48V

RINGING

CONTROL

C1

+5V-5V

Figure 7 - Application Circuit for Balanced Ringing

C2

2-94

Preliminary Information MH88600

C1=C2=10µF, 10V Electrolytic or tantalum C3=1nF, 250V, 20% C3 is recommended to improve stability when used on loop lengths less than 500Ω total or used with active loads

Z=G x Zo R=565.68 x G Ω

G may be chosen to suit preferred component values (useful for capacitive elemen ts); resistive elements should have values in the range of 1k to 1MΩ. Typical values are G = 10

See Tab le 2 for external network examples.

Set Rp=1MΩ for networks not specifying an Rp

RV1

Zo

RV2

RINGING

GENERATOR

90VRMS 20Hz

~

K1

RELA Y

SUPPLY

C3

+ve

K1

16

14

10

3

9

6

5

4

15

40

ZN13

TF1

TF2

TIP

RING

RF2

RF1

RD

VRR

RC

17

External Network

Z

ZN8

MH88600

VDD

VRef

LCA

20

27

VEE

ZN6

21213

R

21

ZN1

25

PG3

26

TX

22

PG4

19

EGB

18

SHK

Bat

VBat

GNDA

GND

811

VX

CODEC

VR

RINGING

CONTROL

Z

Rs

=

Cp

Rp

C1

+5V-5V

C2

Figure 8 - Using an External Network to Match any Zo

2-95

MH88600 Preliminary Information

AAAA

A

AAA

AAAA

2.0

(50.8)

AAA

AAAA

AAA

AAAA

AA

0.3

(7.62)

MH88600

Note 1

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

0.01

0.10 +

(2.54 + 0.25)

Figure 9 - Mechanical Data

1.0

(25.4)

Note 2

0.020 +

0.002

(0.51 + 0.0 51 )

0.09 (2.3)

Note 4

0.260 (6.6)

2-96