MITEL MH88620BR Datasheet



MH88620BR

C.O. SLIC

Preliminary Info rm atio n

Features

• 900 ohm inp ut imp eda nce

• Externally s electa ble net work ba lanc es

• Transformerless 2-4 wire conversion

• Programmab le c onsta nt resis tan ce feed

• Off-Hook and Dial pulse detection

• High immunity to externally induced longitudinal currents

• Auto ring trip

• On-hook tran smissi on (A NI) cap ability

• Minimum p rotecti on circ uitry requi red

• Compatible with require men ts of TEL EBR AS DOC/FCC, CSA/UL, CCITT

• Excellent power dissipation (SIL vertical mountin g)

Applications

• On/Off-Premise PBX Line Cards

• Central Offic e Line C ard s

ISSUE 3 April 1995

Ordering Information

MH88620BR 40 Pin SIL Package

0°C to 70°C

Descript io n

The Mitel MH88620BR SLIC provides all of the functions required to interface 2-wire off premise subscriber loops to a serial TDM, PCM, switching network of a modern PBX. The MH88620BR is manufactured using thick film hybrid technology which offers high voltage capability, reliability and high density resulting in significant printed circuit board area savings. A complete line card can be implemented with very few external components.

V

AGND

EE

2W/4W

conversion

GTX0GTX1RX

Ring Filter

TX

SHK

N1 N2

RING

RF1 RF2

TIP

TF1 TF2

TRD

V

Bat

Matched

Resistors

Test Relay

Driver

TRC

LGND

Feed

Auto Ring

Trip

RGND

VRLY

Driver

Circuitry

and

Speech

Circuit

Ring Relay

Driver

RNGC

RRD

LCA

Loop

Current

Set

Impe dance

Network

Z2Z1

Switch-Hook

Detect

GRX1

GRX0

V

DD

Switch-Hook

Thre sh ol d Set

Gain Adjust

Figure 1 - Functional Block Diagram

2-145

MH88620BR Preliminary Information

TIP

RING

TF1

TF2 RF1 RF2

LGND

LCA

VBA T

IC

RGND

VRLY

RRD

RNGC

REVC

ESI

ESE

AGND

NATT

N1

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

N2

NC

Z1 Z2

TX

RX GTX0 GTX1

GRX0 GRX1

NC

SHK

IC IC IC

IC VEE VDD

Figure 2 - Pin Connections

Pin Description

Pin # Name Description

1TIPTip Lead. Connect s to the TIP lead of the subscriber line.

21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

2 RING Ring Lead: Connects to the Ring lead of the subscriber line. 3TF1Tip Feed 1: Access point for balanced ringing. Normally conne cts to TF2. 4TF2Tip Feed 2: Access point for balan ced ringing. Normally connects to TF 1. 5RF1Ring Feed 1: Access point for balanced ringing. Normally connects to RF2 . 6RF2Ring Feed 2: Access point for balanced ringing. Normally connects to RF1 . 7LGNDBattery Ground. V

return path. Connected to system’s energy dumping ground.

Bat

8LCACurren t Limit Set (In put): The current limit is set by connecting an external resistor as

shown in Table 5. For 70mA default current, this pin is tied to -5V.

9V

Bat

Battery Vo ltage: Ty pi cally -48V dc is applied to this pin. 10 NC No Connection: Reserved. 11 RGND Ring Driver Ground Connection. 12 VRLY Relay Supply Voltage Connection. 13 RRD 14 RNGC

Ring Relay Dri ve (Ou tp ut). Connects to ring relay coil.

Ring Relay Co ntro l (Input) .

15 NC Reserved. No Connection. 16 TR D 17 TR C

Test Relay Drive (Output ): Connects to test relay coi l.

Test Relay Control (Inp ut).

18 AGND Analog G r oun d: V

and V

DD

return path.

EE

.

19 NC No Connection: Reserved. 20 N1 Network Balance Node 1. An external network balance impedance can be connected

between N1 and AGND. See Fig 4. For complex impedances N2 no connection. 21 N2 Network Balance Node 2. An external network balance impedance can be connected

between N2 and AGND. See Fig 4 N2 connects to GND for 900Ω balance.

2-146

Preliminary Information MH88620BR

Pin Description (Continued)

Pin # Name Description

22 NC No Connection. Reserved. 23 Z1 Line impedance Node 1. Normally connects to Z2. See Fig. 3. 24 Z2 Line impedance Node 2. Normally connects to Z1. See Fig 3. 25 TX Transmit (Output) 26 RX Receive (Input). 4-wire (AGND) referenced audio input. 27 GTX0 Transmit Gain Node 0. Connects to GTX1 for 0dB transmit gain. 28 GTX1 Transmit Gain Node 1. Connects to a resistor to AGND for transmit gain adjustment .

29 GRX0 Receive Gain Node 0. Connects to GRX1 for 0dB gain.

30 GRX1 Receive Gain Node 1. Connect to a resistor to AGND for receive gain adjustme nt. 31 NC No Connection. Reserved. 32 NC No Connection. Reserved. 33 NC No Connection. Reserved. 34 SHK

35.38 IC Internal Connection. 39 VEE Negati ve Su pp ly Voltage. -5V dc. 40 VDD Positive Supply voltag e. +5V dc

Off-Hook Indicati on (Outpu t). A logic low output indicates when the subscriber equipment has gone Off-Hook.

. 4-wire (AGND) referenced audio output.

2-147

MH88620BR Preliminary Information

Absolute Maximum Ratings * All voltages are with respect to GNDA unless otherwise stated.

Parameter Symbol Min Max Units

1 Supply Voltages LGND -V

V

GND - V

2 Storage Temp eratu re T

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

DD -

Bat

GND

EE

S

-40 +125 °C

65

6 6

Recommended Operating Conditions† - Voltages are with respect to GNDA unless otherwise stated.

Characteristics Sym Min Typ* Max Units Comments

1 Operating Temperature T 2 Supply Voltages V

* Typical figures are at 25°C and are for design aid only; not guaran teed an d not subject to producti on testing . † Voltages specified are with respect to LGND.

OP Bat

V

DD

V

EE

V

RLY

070°C

-44

4.75

-4.75

-48

+5.0

-5.0 5

70

-60

5.25

-5.25

V V V V

DC Electrical Characteristics*

‡

Characteristics Sym Min Typ

1

Operating Loop Current

I

Loop

17 16

Max Units Test Comments

70 mA

mA mA

= 0Ω, LCA = -5V

R

Loop

1500Ω 2000Ω V

Bat

V V V

= -48V

Variat ion in Loop Current

I

Loop

±2

from nominal

2

3

SHK

4

RNGC

TRC

5

* DC Electrical Characteristics are over recommended operating conditions unless otherwise stated. ‡ Typical figures are at 25°C with nom inal ±5 V supplie s and are for desig n aid only.

Operating Current

Power Dissipation

Low Level Input Voltage High Level Input Voltage

Low Level Input Current High Level Input Current

I

Bat

I

DD

I

EE

PDo PD1

V

OL

V

OH

V

IL

V

IH

I

IL

I

IH

2 15 15

2

250

0.5 V

3.7

0.8 V

2.4 20

20

mA

mA mA mA

W

mW

V

µA µA

= Open (On-hook)

R

Loop

On-Hook or Off-Hook On-Hook or Off-Hook

Active Stand-by/I dle

= 400µ A

I

OL

I

= 40µA

OH

VIL = 0.0V

= 5.0V

V

IH

2-148

Preliminary Information MH88620BR

AC Electrical Characteristics*

Characteristi cs Sym Min Typ

1

Analog Tx Gain (T-R to TX) 0 dB Externally adjusta ble

2

Analog Rx Gain (RX to T-R) 0 dB Ex ter nally a djust abl e

3

Ringing Capability 25 V

4

On-hook Transmission Signal input level Gain 4

5

SHK Rise Time Fall time

6

2 Wire Termination Im peda nce 900 Ω A djust able

7

Off-Hook Detect Threshold 10 mA

8

2-Wire Return Loss

Ω at T-R

900 Zin = 900Ω

t

R

t

F

20 26 20

‡

Max Units Test Com m en ts

R

RMS

Loop

= 1400Ω

Term. 6.8µF +200Ω

V

2.0 8

1 1

V

RMS

dB

msec msec

dB dB dB

= -48V

Bat

T-R load = 10Ωk min. Dial Pulse Detection

300-500Hz 500-2500Hz 2500-3400Hz

900Ω + 2.16µF at T-R Zin = 900Ω

14 18 14

9

Longitudinal Balance

Longitudinal to Metallic 58

55 53

10

Longitudinal Current Capabil ity 40 mA 20mA per lead

11

Idle Channel Noise

8

12

Transhybrid Loss Tx gain 0dB

Rx gain 0dB

Rx to T-R

T-R to Tx

N

CR

N

CX

THL

16 20 16

13 14

Analog Signal Overload Level at TIP and RING 4 dBm

15

Ringing Signal Voltage 70 80 90 V

16

Ringing Frequency 20 25 30 Hz

17

Ring Trip Delay 100 ms

18

Absolute Gain variation -25 0 +.25 dB 0dBm at T-R, 1kHz

19

Relative Gain, reference to 1kHz -2 0 +.2 dB 300-3400Hz

20

Power Supply Rejection Ratio

V

Bat

V

DD

V

EE

* AC Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated. ‡ Typical figures are at 25°C with nomina l +

Note: Test Conditions use a transmit and receive gain set to 0dB default and a Z “Ref” indicates reference impedance which is equivalent to the termination impedance. “Net” indicates ne two rk bala nce impe dance.

5V supplies and are for design aid only.

PSRR

24 24 24

30 30 30

value of 900Ω unless otherwi se stated .

in

dB dB dB

300Hz 600-2000Hz 3400Hz

2000Hz, 1000Hz 2000Hz, 3000Hz 3400Hz

dBrnc dBrnc

dB dB dB

300-500Hz 500-2500Hz 2500-3400Hz

T-R = 900Ω

= -48V

V

Bat

RMS

dB 1kHz, 100mVpp

2-149