MITEL MH88620IN Datasheet



MH88620IN

C.O. SLIC

Preliminary Information

Features

• 600 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 requ irem ents of CDOT D OC/ 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

MH88620IN 40 Pin SIL Package

0°C to 70°C

Descript io n

The Mitel MH88620IN 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 MH88620IN 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.

VEE

AGND

2W/4W

conversion

GTX0

GTX1

Ring

Filter

SHK

N1 N2

RING

RF1 RF2

TIP TF1 TF2

TRD

LGND

VBat VDD

Matched

Feed

Resistors

Test Relay

Driver

TRC

Auto Ring

Trip

RGND

VRLY

Driver

Circuitry

and

Speech

Circuit

Ring Relay

Driver

RNGC

RRD

LCA

Loop

Current

Set

Impedance

Network

Switch-Hook

Detect

GRX0

GRX1Z2

Switch-Hook

Threshold Set

Gain Adjust

Figure 3 - Functional Block Diagram

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MH88620IN Preliminary Information

TIP

RING

TF1

TF2 RF1 RF2

LGND

LCA

VBAT

RGND

VRLY

RRD

RNGC

NC TRD TRC

AGND

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16 17 18 19 20

N2 NC

Z1 Z2

RX GTX0 GTX1

GRX0 GRX1

SHK

IC IC IC

IC VEE VDD

Figure 2 - Pin Connections

Pin Description

Pin # Name Description

1TIPTip Lead. Connects to the TIP lead of the subscriber line 2RINGRing Lead: Connects to the Ring lead of the subscriber line.

21 22 23 24

25 26 27 28

29 30 31 32 33 34 35 36 37 38 39

3TF1Tip Fee d 1: Access point for balanced ringing. Normally connects to TF2. 4TF2Tip Feed 2: Access point for balanced ringing. Normally connects to TF1. 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

8LCACurrent Limit Se t (Inpu t) : 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.

Battery Voltage: Typically -48V dc is applied to this pin.

Bat

10 RS1 Ring Sense Resistor Conn ectio n 1. See Figure 7a. 11 RGND Ring Driver Ground Con nection . 12 VRLY Relay Supply Voltage Connection

13 RRD

Ring Relay Drive (Output). Connects to ring relay coil

14 RNGC Ring Relay Control (Input) 15 RS2 Ring Sense Resistor Conn ectio n 2. See Figure 7a 16 TRD Test Relay Drive (Output): Connects to test relay coil.

17 TR C 18 AGND Analog Ground: V

Test Relay Con trol (Input).

and V

return path

19 NC No Connection: Reserved. 20 N1 Network Balan ce Nod e 1. An external network balance impedance can be connected

between N1 and AGND. See Fig 4. for compl ex imped ances. N2 no connecti on.

21 N2 Network Balance Node 2. See Fig 4. N2 connects to GND for 600Ω balance. N1 no

connection.

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Preliminary Information MH88620IN

Pin Description (Continued)

Pin # Name Description

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

29 GRX0 Recei ve Gai n Nod e 0. Connects to GRX1 for 0dB gain

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

34 SHK

35.38 IC Internal Con necti on. 39 VEE Negative Supply Voltage. -5V dc. 40 VDD Positive Supply voltage. +5V dc

Off-Hook Indication (Outp ut). A logic low output indicates when the sub scriber equipment has gone Off-Hook.

. 4-wire (AGND) referenced audio output .

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MH88620IN 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

GND - V

2 Storage Temperature T

* Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied.

DD -

Bat

GND

-40 +125 °C

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 desi gn aid only; not guarantee d and not subje ct to producti on testing. † Voltages specified are with respect to LGND.

V V

Bat*

070°C

-44

4.75

-4.75

-48

+5.0

-5.0

-60

5.25

-5.25

V V V

DC Electrical Characteristics*

‡

Characteristics Sym Min Typ

Operating Loop Current

Loop

17 16

Max Units Test Comments

70 mA

mA mA

= 0Ω, LCA = -5V

Loop

1500Ω 2000Ω V

Bat

V V V

= -48V

Variation in Loop current from nominal

Operating Current

Power Dissipation

SHK

Low Level Output Voltage High Level Output Voltage

RNGC

TRC

Low Level Input Voltage High Level Input Voltage

Low Level Input Current High Level Input Current

* 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.

Loop

Bat

PDo PD1

±2

2 15 15

250

0.5 V

3.7

0.8 V

2.4 20

mA mA mA

µA µA

= Open (On-hook)

Loop

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

Active Stand-by/I dle

= 400µ A

= 40µ A

VIH = 5.0V

= 0.0V

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Preliminary Information MH88620IN

AC Electrical Characteristics*

1 1

‡

Max Units Test Comments

RMS

= 1400Ω

Loop

Term. 6.8µF +200Ω

2.0 8

RMS

msec

= -48V

Bat

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

msec

dB dB dB

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

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

dBrnC dBrnC

Characteristics Sym Min Typ

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

Analog Rx G ain (RX to T-R) 0 dB Externally adjustable

Ringing Capability 25 V

On-hook Transmission Signal input lev el Gain 4

SHK Rise Time Fall time

2 Wire Termination Impedance 600 Ω Adjusta ble

Off-Hook Detect Threshold 10 mA

2-Wire Return Loss 600Ω at T-R

20 26 20

Longitudinal Balance

Longitudinal to Metallic 58

55 53

Longitudinal Current Capabilit y 40 mA 20mA per lead

Idle Channel Noise

Transhybrid Loss

Rx to T-R

T-R to Tx

THL

Tx gain 0dB Rx gain 0dB

16 20 16

Analog Signal Overload Level at TIP and RING 4 dBm

Ringing Signal Voltage 70 80 90 V

Ringing Frequency 2 0 25 30 Hz

Ring Trip Delay 100 ms

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

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

Power Supply Rejection Rat io

BAT

* 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. 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.

PSRR

24 24 24

30 30 30

value of 600Ω unless otherwi se sta ted.

dB dB dB

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

T-R = 900Ω

= -48V

BAT

RMS

dB 1kHz, 100mVpp

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