Datasheet MT91600 Datasheet (MITEL)

MT91600

Programmable SLIC

Preliminary Information

Features

• Transformerless 2W to 4W conversion

• Controls battery feed to line

• Programmable line impedance

• Programmable network balance impedance

• Off-hook and dial pulse detection

• Ring ground over-current protection

• Programmable gain

• Programmable constant current feed

• -22V to -72V battery operation

Applications

Line interface for:

• PABX/ONS

• Intercoms

• Key Telephone Systems

• Control Systems

DS5057 ISSUE 7 August 1999

Package Information

MT91600 28 Pin SSOP Package

-40°C to +85°C

Description

The Mitel MT91600 provides an interface between a
switching system and a subscriber loop, mainly for
short loop SLIC applications. The functions provided
by the MT91600 include battery feed, programmable
constant current, 2W to 4W conversion, off-hook and
dial pulse detection, user definable line and network
balance impedance’s and the capability of
programming the audio gain externally. The device is
fabricated as a CMOS circuit in a 28 pin SSOP
package.

TD

TF

TIP

RING

RF

C3A
C3B

RV

RD

Tip Drive
Controller

Line Sense

Over-Current

Protection Circuit

Ring Drive
Controller

X3 X2 X1

Audio Gain & Network

Balance Circuit

2 W to 4 W

Conversion & Line

Impedance

Loop Supervision

Figure 1 - Functional Block Diagram

Relay

Driver

VX

VR

Z3
Z2

Z1

RLYC
RLYD

VEEGNDVDDC2BC2AC1SHKVREFIC

1

MT91600 Preliminary Information

VDD

TD

TF

TIP

RING

VREF

RF
RV

RD

C3A
C3B
C2B
C2A

1
2
3
4
5
6
7

IC

8
9
10
11
12
13
14

28
27
26
25
24
23
22
21
20
19
18
17
16
15

VEE
GND

RLYD
RLYC

SHK
C1
X2
VR
X3
VX
X1
Z3
Z2
Z1

Figure 2 - Pin Connections

Pin Description

Pin # Name Description

1 VDD Positive supply rail, +5V.
2TDTip Drive (Output). Controls the Tip transistor.
3TFTip Feed. Connects to the Tip transistor and to the TIP lead via the Tip feed resistor.
4 TIP Tip. Connects to the TIP lead of the telephone line.
5 RING Ring. Connects to the RING lead of the telephone line.
6 VREF Reference Voltage (Input). This pin is used to set the subscribers loop constant

current. Changing the input voltage sets the current to any desired value within the

working limits. VREF is related to VLC.
7ICInternal Connection (Input). This pin must be connected to GND for normal operation.
8RFRing Feed. Connects to the RING lead via the Ring feed resistor.
9RVRing Voltage and Audio Feed.Connects directly to the Ring drive transistor and also to

Ring Feed via a relay.

10 RD Ring Drive (Output). Controls the Ring transistor.
11 C3A A filter capacitor for over-current protection is connected between this pin and GND.
12 C3B A filter capacitor for over-current protection is connected between this pin and GND.
13 C2B A capacitor for loop current stability is connected between this pin and C2A.
14 C2A A capacitor for loop current stability is connected between this pin and C2B.
15 Z1 Line Impedance Node 1. A resistor of scaled value "k" is connected between Z1 and

Z2. This connection can not be left open circuit.

16 Z2 Line Impedance Node 2. This is the common connection node between Z1 and Z3.
17 Z3 Line Impedance Node 3. A network either resistive or complex of scaled value "k" is

connected between Z3 and Z2. This connection can not be left open circuit.

18 X1 Gain Node 1. This is the common node between Z3 and VX where resistors are

connected to set the 2W to 4W gain.

19 VX Transmit Audio (Output). This is the 4W analog signal to the SLIC.
20 X3 Gain Node 3. This is the common node between VR and the audio input from the

CODEC or switching network where resistors are fitted to sets the 4W to 2W gain

21 VR Receive Audio (Input). This is the 4W analog signal to the SLIC.

2

Preliminary Information MT91600

Pin Description (continued)

Pin # Name Description

22 X2 Gain Node 2. Networks, either resistive or complex, are connected between this node,

VR and GND to set the Network Balance Impedance for the SLIC.
23 C1 A filter capacitor for ring trip is connected between this pin and GND.
24 SHK Switch Hook (Output). This pin indicates the line state of the subscribers telephone.

The output can also be used for dial pulse monitoring. SHK is high in off-hook state.
25 RLYC Relay Control (Input). An active high on this pin will switch RLYD low.
26 RLYD Inverted Output of RLYC. It is used to drive the bipolar transistor that drives the relay

(see Figure 5.)
27 GND Ground. Return path for +5V and -5V. This should also be connected back to the

return path for the loop battery, LGND and relay drive ground RLYGND.
28 VEE Negative supply rail, -5V.

Functional Description

The MT91600 is the analog SLIC for use in a 4 Wire
switched system. The SLIC performs all of the
normal interface functions between the CODEC or
switching system and the analog telephone line such
as 2W to 4W conversion, constant current feed,
ringing and ring trip detection, current limiting, switch
hook indication and line and network balance
impedance setting using minimal external
components.

Refer to Figure 5 for MT91600 components
designation.

2 Wire to 4 Wire Conversion

The hybrid performs 2 wire to 4 wire conversion by
taking the 4 wire signal from an analog switch or
voice CODEC, a.c. coupled to VR, and converting it
to a 2 wire differential signal at tip and ring. The 2
wire signal applied to tip and ring by the telephone is
converted to a 4 wire signal, a.c. coupled to Vx which
is the output from the SLIC to the analog switch or
voice CODEC.

4W to 2W gain:
Gain 4 - 2 = 20*Log [0.891 * (R14 / R15)]

Impedance Programming

The MT91600 allows the designer to set the device’s
impedance across TIP and RING, (ZTR), and
network balance impedance, (ZNB), separately with
external low cost components.

For a resistive load, the impedance (ZTR) is set by
R11 and R18. For a complex load, the impedance
(ZTR) is set by R11, R18, R19 & C8 (see Figure 5.)

The network balance, (ZNB), is set by R16, R17 & C3
(see Figure 5.)

The network balance impedance should be
calculated once the 2W - 4W gain has been set.

Line Impedance

For optimum performance, the characteristic
impedance of the line, (Zo), and the device’s
impedance across TIP and RING, (ZTR), should
match. Therefore:

Gain Control

It is possible to set the Transmit and Receive gains
by the selection of the appropriate external
components.

The gains can be calculated by the formulae:

2W to 4W gain:
Gain 2 - 4 = 20*Log [ R13 / R12]

Zo = Z

TR

The relationship between Zo and the components
that set ZTR is given by the for mula:

Zo / ( R1+R2) = kZo / R11
where kZo =Z

ZLZ = R18, for a resistive load.
ZLZ = [R18 + (R19 // C8)], for a complex load.

LZ

3

MT91600 Preliminary Information

The value of k can be set by the designer to be any
value between 20 and 250. Three rules to ensure the
correct operation of the circuit:

(A) R18 + R19 > 50kΩ
(B) R1 = R2.
(C) R11 > =50kΩ

It is advisable to place these components as close
as possible to the SLIC.

Network Balance Impedance

The network balance impedance, (ZNB), will set the
transhybrid loss performance for the circuit. The
balance of the circuit is independent of the 4 - 2 Wire
gain but is a function of the 2 - 4 Wire gain.

The method of setting the values for R16 and R17 is
given by the for mula:

R17 = [1.782 * Zo/ ( Zo+ZNB) * ( R13 / R12 )]
R17 + R16 [1 + R13 / R12]

where ZNB is the network balance impedance of the
SLIC and Zo is the line impedance.

The MT91600’s programmable current range is
between 18mA to 32mA.

Line Drivers & Overcurrent Protection

The Line Drivers control the external Battery Feed
circuit which provide power to the line and allows bi­directional audio transmission.

The loop supervision circuitry provides bias to the
line drivers to feed a constant current while the over­current protection circuitry prevents the ring driver
from causing the ring transistor to overload.

The line impedance presented by the Line Driver
circuitry is determined by the external network,
which may be purely resistive or complex, allowing
the circuit to be configured for use in any application.
The impedance can also be fixed to one value and
modified to look like a different value by reflecting an
impedance through the SLIC from an intelligent
CODEC or DSP module.

There is long term protection on the RING output
against accidental short circuits that may be applied
either across TIP/RING to GND or RING to GND.
This high current will be sensed and limited to a
value that will protect the circuit.

(R16 + R17) >= 50kΩ

It is advisable to place these components as close
as possible to the SLIC.

Loop Supervision & Dial Pulse
Detection

The Loop Supervision circuit monitors the state of
the phone line and when the phone goes "Off Hook"
the SHK pin goes high to indicate this state. This pin
reverts to a low state when the phone goes back "On
Hook" or if the loop resistance is too high for the
circuit to continue to support a constant current.

The SHK output can also be monitored for dialing
information when used in a dial pulse system.

Constant Current Control

The SLIC employs a feedback circuit to supply a
constant feed current to the line. This is done by
sensing the sum of the voltages across the feed
resistors, R1 and R2, and comparing it to the input
reference voltage, Vref, that determines the constant
current feed current.

In situations where an accidental short circuit occurs
either across TIP/RING to GND or RING to GND, an
excessive amount of current will flo w through the ring
drive transistor, Q3. Although the MT91600 will
sense this high current and limit it, if the power rating
of Q3 is not high enough, it may suffer permanent
damage. In this case, a power sharing resistor, R23,
can be inserted (see Figure 5) to dissipate some of
the power. Capacitor C13 is inserted to provide an
a.c. ground point. The criteria for selecting a value
for the power sharing resistor R23 can be found in
the application section of this datasheet.

Ringing and Ring Trip Detection

Ringing is applied to the line by disconnecting pin 8,
RF, from pin 9, RV, and connecting it to a ringing
source which is battery backed. This may be done by
use of an electro-mechanical relay. The SLIC is
capable of detecing an Off Hook condition during
ringing by filtering out the large A.C. component by
use of the external components connected to pin 23.
This filter allows an Off Hook condition to be
monitored at SHK, pin 24.

4

Preliminary Information MT91600

When using DTMF signalling only i.e. pulse dialling
is not used, the capacitor, C7, can be permanently
connected to ground and does not require to be
switched out during dialling.

Power up Sequence

The circuit should be powered up in the following
order: AGND, VEE, VDD, V

BAT.

Application

The following Application section is intended to
demonstrate to the user the methods used in
calculating and selecting the external programming
components in implementing the MT91600 as an
analog line interface in a communication system.
The programming component values calculated
below results in the optimum performance of the
device.

Refer to Figure 5 for MT91600 components
designation.

From Figure 3 with R1 = R2 = 220Ω
For I

V

LC

= 25mA, VLC = 0V, Vbat=-48V

LOOP

R3
43kΩ

R4

C9

100nF

130kΩ

V

BAT

6

V

REF

MT91600

Figure 3 - Resistor Divider

C9 is inserted to ensure pin 6, Vref, remains at a.c.
ground. 100nF is recommended.

I

can also be set by directly driving Vref with a

LOOP

low impedance voltage source. (See Figure 4). It is
recommended that a small resistor be placed in
series with the Vref pin. In this case:

I

= 1.07 * Vs where, Vs < 0

LOOP

(R1 +R2)

Component Selection

Feed Resistors (R1, R2)

The selection of feed resistors, R1 and R2, can
significantly affect the performance of the MT91600.
It is recommended that their values fall in the range
of:

200Ω <= R1 <= 250Ω
where, R1 = R2
The resistors should have a tolerance of 1% (0.15%

matched) and a power rating of 1 Watt.

Loop Current Setting (R3, R4, C9)

By using a resistive divider network, (Figure 3), it is
possible to maintain the required voltage at Vref to
set I
the following relationship:

I

LOOP

(R1 +R2)
where, F = R4 / (R4 + R3)

. The loop current programming is based on

LOOP

= - [ F * VLC + G * V

] * Ko * H

BAT

G = R3 / (R4 +R3)
Ko= 200000 / (200000 + (R4//R3) )
H = 1.07
I

is in Ampere

LOOP

2kΩ

Vs

C9

100nF

6

V

REF

MT91600

Figure 4 - Direct Voltage

Calculating Component Values For AC
Transmission

There are five parameters a designer should know
before starting the component calculations. These
five parameters are:

1) characteristic impedance of the line Z

2) network balance impedance Z

NB

o

3) value of the feed resistors (R1 and R2)

4) 2W to 4W transmit gain

5) 4W to 2W receive gain

The following example will outline a step by step
procedure for calculating component values. Given:

5

MT91600 Preliminary Information

Zo = 600Ω, ZNB= 600Ω, R1=R2= 220Ω

Gain 2 - 4 = -1dB, Gain 4 - 2 = -1dB

Step 1: Gain Setting (R12, R13, R14, R15)

Gain 2 - 4 = 20 Log [ R13 / R12]

-1 dB = 20 Log [R13 / R12]
∴ R12 = 112.2kΩ, R13 = 100kΩ.

Gain 4 - 2 = 20 Log [0.891 * [R14 / R15)]

-1 dB = 20 Log [0.891 * [R14 / R15)]
∴ R14 = 100kΩ, R15 = 100kΩ.

Step 2: Impedance Matching (R11, R18, R19, C8)

a) Zo / ( R1+R2) = kZo / R11

600/(220+220) = (k*600)/R11
let k = 125

∴ R11 = 55kΩ.

b) In general,

Given Zo = 220Ω + (820Ω // 120nF)

Zo / ( R1+R2) = kZo / R11 (Equation 1)

where, kZo = [R18 + (R19 // C8)]

Choose a standard value for C8 to find a suitable
value for k.

Since 1nF exists, let C8 = 1nF then,
k = 120nF / C8
k = 120nF / 1nF

∴ k =120
R18 = k * 220Ω
R18 = 120 * 220Ω
R18 = 26400

R19 = k * 820Ω
R19 = 120 * 820
R19 = 98400

∴ R18 = 26k4Ω, R19 = 98k4Ω

kZo =Z
where:
ZLZ = R18, for a resistive load.
ZLZ = [R18 + (R19 // C8)], for a complex load.

Since we are dealing with a resistive load in this
example ZLZ = R18, and therefore:

kZo = R18
(125 * 600)= R18

∴ R18 = 75kΩ.

Step 3: Network Balance Impedance (R16, R17)

R17 = [1.782 * Zo/ ( Zo+ZNB) * ( R13 / R12 )]
R17 + R16 [1 + R13 / R12)]

R17 = 0.4199
R17 + R16

set R17 = 100kΩ, R16 becomes 138kΩ.
∴ R16 = 138kΩ, R17 = 100kΩ.

Complex Line Impedance, Z

LZ

o

From (Equation 1)
R11 = k * (R1 + R2)
R11 = 120 * (220Ω + 220Ω)

∴ R11 = 52k8Ω

Power Sharing Resistor (R23)

To determine the value of R23, use the following
equations:

R23(max)= |Vbat(min)| - 100 - (2*R2 + Lr + DCRP)
30mA

R23(min)= |Vbat(max)| - Pd(max) - R2
40mA 1.6mA

where,
Vbat(min/max) = the expected variation of Vbat.
R2 = the feed resistor.
Lr = maximum DC loop resistance.
DCRP = DC resistance of the phone set.
Pd(max) = the maximum power dissipation of the

ring drive transistor Q3.

In situations where the characteristic impedance of
the line Zo is a complex value, determining the
component values for impedance matching (R11,
R18, R19, C8) is as follows:

6

If R23(max) > R23(min), then set R23 to be the
geometric center:

R23 = Square Root (R23(max) * R23(min))

Preliminary Information MT91600

If R23(max) < R23(min), then a violation has
occurred. Pd(max) will have to be increased.

A numerical example:

Given:
R2 = 220Ω
Lr = 325Ω (2.5km of 28 gauge wire, averaged at

65Ω/km)
DCRP = 200Ω
Pd(max) = 1.5W
Vbat = -48V +/- 10% (i.e. -43V to -53V)

Therefore:

R23(max) = (43/30mA) - 100 - (2 * 220 + 325 + 200)
= 1433.3 - 100 - 965
R23(max) = 368.3Ω

R23(min) = (53/40mA) - (1.5/1.6mA) - 220
= 1325 - 937.5 - 220
R23(min) = 167.5 Ω

R23 = Square Root ( 368.3 * 167.5 )
R23 = 248.4Ω

7

MT91600 Preliminary Information

VEE

VDD

C7

C6

K1b

727281

VRLY

K1

RLYC

Q4

SHK

C4

VDD

VEE GND IC C1

SHK

24

RLYC

25

26

RLYD

D1

V

LC

V

D2a

BAT

R3

VREF

6

Q1

C9

C12

TD

2

R4

V

BAT

23

X2

VR

X3

VX

X1

22
21

20
19

18

R14

R16

C11

R13

R15

C3

R17

VRIN

VX

D2b

R22

TF

3

MT91600

R12

R1

TIP

RING

R5

~

90 Vrms

V

BAT=-48V

Q3

PR1

K1a

R2

R9

V

BAT

D3a

R6

R8

R21

R20

C5

VDD

D3b

R7

TIP

4

RING

5

RF

8

9

RV

RD C3A C3B C2B C2A

10

Q2

C1

C10

C2

17

Z3

Z2

16

Z1

15

14131211

R10

Resistive Load Z

Z

LZ

R11

Impedance Z

Complex Load Z

o

LZ

o

R18

C13

R23

V

BAT

R18

R19

C8

Figure 5 - Typical application

8

Preliminary Information MT91600

Component List* for a Typical Application with a Resistive 600Ω Line Impendance - Refer to

Figure 5 for component designation and recommended configuration

Resistor Values

R1 220Ω 1% (0.15% matched), 1W R2 220Ω 1% (0.15% matched), 1W
R3 43kΩ R4 130kΩ
R5 220Ω R6 75kΩ
R7 3kΩ R8 1kΩ

R9 1kΩ R10 560kΩ
R11 55kΩ R12 112kΩ
R13 100kΩ R14 100kΩ
R15 100kΩ R16 138kΩ
R17 100kΩ R18 75kΩ
R19 0Ω R20 2kΩ
R21 2kΩ R22 1kΩ
R23 248Ω

Capacitor Values

C1 100nF, 5% C2 300nF, 5%

C3 100pF, 5% C4 33nF, 20%

C5 3.3nF, 5% C6 1uF, 20%, 16V

C7 100nF, 20% C8 0F

C9 100nF, 20% C10 100nF, 5%
C11 47pF, 20% C12 33nF, 10%
C13 100nF 20%

Diodes and Transistors

D1 BAS16 or equivalent D2a/b BAV99 dual diode or equivalent

D3a/b BAV99 dual diode or equivalent Q1 2N2222 or MPSA42 or MMBTA42

Q2 2N2907 or MPSA92 or MMBTA92 Q3 2N2222 or MPSA42 or MMBTA42

Q4 2N2907 or MPSA92 or MMBTA92

Note: All resistors are 1/4 W, 1% unless otherwise indicated.
*Assumes Zo = ZNB = 600Ω, Gain 2 - 4 = -1dB, Gain 4 - 2 = -1dB.
Decoupling capacitors, (1uF, 100V, 20%), can be added to VDD, VEE, V
PSRR performance.

BAT

and V

to provide improved

RLY

K1 = Electro-mechanical relay, 5V, DPDT/2 FORM C
PR1 = This device must always be fitted to ensure damage does not occur from inductive loads.For

simple applications, PR1 can be replaced by a single TVS, such as 1.5KE220C, across tip and ring. For
applications requiring lightning and mains cross protection further circuitr y will be required and the following
protection devices are suggested: P2353AA, P2353AB (Teccor), THBT20011, THBT20012, THBT200S (SGS­Thomson), TISP2290, TSSP8290L (T.I.)

9

MT91600 Preliminary Information

Absolute Maximum Ratings*

Parameter Sym Min Max Units Comments

.

1 DC Supply Voltages V

V

V

DD
EE

BAT

-0.3

-6.5

-80

+6.5
+0.3
+0.3

V
V
V Limited by the Drive

transistor, Q3.
2 Ringing Voltages Vring 100 Vrms Superimposed on V
3 Voltage setting for Loop Current V
4 Overvoltage Tip/GND Ring/GND,

REF

-20 +0.3 V Note 1
200 V MAX 1ms (with power on)

BAT

Tip/Ring
5 Ringing Current Iring 30 mA. RMS
6 Ring Ground over-current 45 mA Note 2
7 Storage Temp Tstg -65 +150 ˚C
8 Package Power Dissipation Pdiss 0.10 W +85˚C max, V

BAT

= -48V

9 ESD Rating 500 V Human Body Model

Note 3

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

Note 1: Voltage at Vref pin set by VLC and potential divider.
Note 2: Tip and Ring must not be shorted together and to ground at the same time.
Note 3: The device contains circuitry to protect the inputs from static voltage up to 500V. However, precautions should be taken to avoid
static charge build up when handling the device.

Recommended Operating Conditions

Parameter Sym Min Typ

‡

Max Units Test Conditions

1 Operating

Supply Voltages

2 Ringing Voltage Vring 0 50 V

V

V

V

DD

EE

BAT

4.75

-5.25

-72

5.00

-5.00

-48

5.25

-4.75

-22

V
V
V

RMS

3 Voltage setting for Loop Current VREF -10.3 V I

4 Operating Temperature To -40 +25 +85 ˚C

‡ Typical figures are at 25˚C with nominal supply voltages and are for design aid only

†Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated.
‡Typical figures are at 25°C with nominal + 5V supplies and are for design aid only.

Note 4: 16 to 68 Hz superimposed on a V

BAT

.

Note 4

= 25mA,

LOOP

R1=R2=220Ω
V

= -48V

BAT

10

Preliminary Information MT91600

DC Electrical Characteristics

†

Characteristics Sym Min Typ‡Max Units Test Conditions

1 Supply Current I

I

I

BAT

DD
EE

25

11

8.5
45

mA
mA

mA
2 Power Consumption PC 60 90 mW Standby/Active
3 Constant Current Line

Feed

4 Programmable Loop

I

LOOP

I

LOOP

22 25 28 mA V

18 32 mA

= -10.3V

REF

Test circuit as Fig. 6
V

= -48V

BAT

Current Range

5 Operating Loop

(inclusive of Telephone
Set)

6 Off Hook Detection

Threshold

R

LOOP

1200

450

Ω
Ω

SHK 20 mA V

I

LOOP

V

BAT

I

LOOP

V

BAT
REF

V

BAT

= 18mA

= -48V

= 18mA

= -22V

= -10.3V

= -48V

See Note 5. I

7RLYC

Input Low Voltage
Input High Voltage

Vil

Vih

2.0

0.4 0.7 V
V

lil = 50µA
lih = +50µA

LOOP

= 25mA

8 SHK

Output Low Voltage
Output High Voltage

8 Dial Pulse Distortion ON

OFF

†

Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated.

‡

Typical figures are at 25°C with nominal +5V and are for design aid only.

Note 5: Off hook detection is related to loop current.

Vol

Voh

2.7
+4

+4

0.4 V
V

ms
ms

Lol = 8mA
Loh = -0.4mA

11

MT91600 Preliminary Information

AC Electrical Characteristics

Characteristics Sym Min Typ

†

‡

Max Units Test Conditions

1 Ring Trip Detect Time Tt 100 300 mS
2 Output Impedance at VX 10 Ω
3 Gain 4-2 @ 1kHz -1.3 -1 -0.8 dB Note 6

Test circuit as Fig. 8
4 Gain Relative to 1kHz ±0.15 dB 300Hz - 3400Hz
5 Transhybrid Loss THL 20 25 dB Note 6

300Hz - 3400Hz

Test circuit as Fig. 8
6 Gain 2-4 @ 1kHz -1.3 -1 -0.8 dB Note 6

Test circuit as Fig. 7
7 Gain Relative to 1kHz ±0.15 dB 300Hz to 3400Hz
8 Return Loss at 2-Wire RL 20 30

dB

Note 6

300Hz - 3400Hz

Test circuit as Fig. 10
9 Total Harmonic Distortion

@2W
@VX

THD

0.3

0.3

1.0

1.0

%
%

3dBm, 1kHz @ 2W

1Vrms, 1KHz @ 4W

10 Common Mode Rejection

2 wire to Vx

CMR 35 42 dB Input 0.5Vrms, 1KHz

Test circuit as Fig. 9

11 Longitudinal to Metallic Balance LCL 55 dB 200Hz to 3400Hz

Test circuit as Fig. 9

12 Metallic to Longitudinal Balance 58

48

13 Idle Channel Noise

Nc

@2W
@VX

14 Power Supply Rejection

PSRR

12
12

dB
dB

dBrnC
dBrnC

200Hz to 1000Hz

1000Hz to 3400Hz

Cmessage Filter

Cmessage Filter

Ratio at 2W and VX
Vdd
V ee

†

Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated.

‡

Typical figures are at 25°C with nominal +5V and are for design aid only.
Note 6: Assumes Zo = ZNB = 600Ω and both transmit and receive gains are programmed externally to -1dB, i.e. Gain 2-4 = -1dB , Gain 4-2
= -1dB.

23
23

dB
dB

0.1Vp-p @ 1kHz

Mechanical Information

Refer to the latest copy of the Mitel data book for details of the outline for the 28 Pin SSOP package.

12

Preliminary Information MT91600

Test Circuits

Figures 6,7,8,9,10 are for illustrating the principles involved in making measurements and do not necessarily
reflect the actual method used in production testing.

TIP

I

Loop

Z

o

RING

SLIC

6

R4

V

BAT

R3

C9

V

LC

Figure 6 - Loop current programming

20

TIP

Z

o

__

2

SLIC

o

RING

V

TR

V

S

~

Z

__

2

19

18

17

R15

R13

R12

V

X

Gain = 20*Log(VX/VTR)

Gain = 20*Log(VTR/VS)

THL = 20*Log(VX/VS)

Figure 7 - 2-4 Wire Gain

19

TIP

22

21

o

RING

V

TR

Z

SLIC

20

R16 R17

C11

R14

Figure 8 - 4-2 Wire Gain & Transhybrid Loss

R15

V

~

X

C3

V

S

13

MT91600 Preliminary Information

V

S

~

Long. Bal. = 20*Log(VTR/VS)
CMR = 20*Log(VX/VS)

R

V

S

~

R

R15

V

X

__

__

TIP

Z

o

2

V

TR

Z

o

2

RING

SLIC

20

19

Figure 9 - Longitudinal Balance & CMR

20

TIP

Z

o

V

Z

RING

SLIC

17

16

15

R15

R19

R18

C8

R11

Gain = 20*Log(2*VZ/VS)

Figure 10 - Return Loss

14

Pin 1

Package Outlines

E

A

L

H

e

D

A

2

A

1

B

Notes:

1) Not to scale

2) Dimensions in inches

3) (Dimensions in millimeters)

4) Ref. JEDEC Standard M0-150/M0118 for 48 Pin

5) A & B Maximum dimensions include allowable mold flash

C

20-Pin 24-Pin 28-Pin 48-Pin

Dim

Min Max Min Max Min Max Min Max

A 0.079

(2)

A10.002

(0.05)

B 0.0087

(0.22)

C 0.008

D 0.27

(6.9)

E 0.2

(5.0)

e 0.025 BSC

A20.065

(1.65)

H 0.29

(7.4)

L 0.022

(0.55)

0.013
(0.33)

(0.21)

0.295
(7.5)

0.22

(5.6)

(0.635 BSC)

0.073

(1.85)

0.32

(8.2)

0.037

(0.95)

- 0.079

0.002

(0.05)

0.0087
(0.22)

0.31

(7.9)

0.2

(5.0)

0.025 BSC

(0.635 BSC)

0.065
(1.65)

0.29
(7.4)

0.022
(0.55)

(2)

0.013
(0.33)

0.008
(0.21)

0.33

(8.5)

0.22
(5.6)

0.073
(1.85)

0.32
(8.2)

0.037
(0.95)

0.002
(0.05)

0.0087
(0.22)

0.39
(9.9)

0.2

(5.0)

0.025 BSC

(0.635 BSC)

0.065
(1.65)

0.29
(7.4)

0.022
(0.55)

0.079
(2)

0.013

(0.33)

0.008
(0.21)

0.42

(10.5)

0.22
(5.6)

0.073
(1.85)

0.32
(8.2)

0.037
(0.95)

0.095
(2.41)

0.008
(0.2)

0.008
(0.2)

0.62

(15.75)

0.291

(7.39)

0.025 BSC

(0.635 BSC)

0.089

(2.26)

0.395

(10.03)

0.02

(0.51)

0.110
(2.79)

0.016

(0.406)

0.0135
(0.342)

0.010
(0.25)

0.63

(16.00)

0.299
(7.59)

0.099
(2.52)

0.42

(10.67)

0.04

(1.02)

Small Shrink Outline Package (SSOP) - N Suffix

General-11

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