MITEL MH88422BD-1

MH88422
Data Access Arrangement
Preliminary Information
Features
DS5067
ISSUE 10
November 1998
Ordering Informations
•
•
•
•
•
•
•
•
•
•
FAX and Modem interface (V29)
Variants available with different line
impedances
Provides reinforced barrier to international PTT
requirements
Transformerless 2-4 Wire conversion.
Integral Loop Switch
Dial Pulse and DTMF operation
Line state detection outputs
Loop current/ringing outputs
Single +5V operation, low on-hook power
(5mW)
Full duplex data transmission
MH88422-1/2/3
MH88422BD-1
26 Pin DIL Package
26 Pin DIL Package
0°C to 70°C
Description
The Mitel MH88422 Data Access Arrangement
(D.A.A.) provides a complete interface between data
transmission equipment and a telephone line. All
functions are integrated into a single thick film hybrid
module which provides high voltage isolation, very
high reliability and optimum circuit design needing a
minimum of external components.
Applications
Interface to Central Office or PABX line for:
•
•
•
Modem
FAX
Telemetry
A number of variants are available to meet particular
country impedance requirements. The D.A.A. has
been designed to meet regulatory approvals
requirements in these countries.
Isolation Barrier
VDD
AGND
TIP
RING
Input Buffer
&
Line Termination
TXIN
OptoIsolation
Logic Input
Buffer
LC
OptoIsolation
Audio
Buffer
VR
OptoIsolation
Audio
Buffer
OptoIsolation
Ring & Loop
Buffer
TF
RLS
Network Connections
Transhybrid
loss
cancellation
circuit
VX
RVLC
User Connections
Figure 1 - Functional Block Diagram
2-13
MH88422
Preliminary Information
VDD
IC
AGND
IC
LC
IC
RVLC
IC
IC
IC/NP
VX
IC/NP
VR
1
2
3
4
5
6
7
8
9
10
11
12
13
26
25
24
23
22
21
20
19
18
17
16
15
14
TIP
IC
RLS
IC/NP
IC
IC/NP
TF
NP
TXIN
IC
RING
NP
IC
Figure 2 - Pin Connections
Pin Description
Pin #
Name
Description
1
VDD
2, 4, 6,
8, 9
IC
3
AGND
5
LC
7
RVLC
Ringing Voltage and Current Detect (Output). Indicates the status of loop current
and ringing voltage.
10, 12
IC/NP
Internal Connection or No Pin Fitted. This pin is either cropped short or not fitted,
depending on the variant. See Note 1
11
VX
Transmit (Output). Analog output to modem/fax chip set.
13
VR
Receive (Input). Analog input to modem/fax chip set.
14, 17
IC
Internal Connection. This pin is cropped short.
15, 19
NP
No Pin Fitted.
16
RING
Ring Lead. Connects to the "Ring" lead of a telephone line.
18
TXIN
Dummy Ringer Connection. Connects to the "Ring" lead of a telephone line through a
dummy ringer capacitor.
20
TF
21, 23
IC/NP
24
RLS
25
IC
Internal Connection. This pin is cropped short.
26
TIP
Tip Lead. Connects to the "Tip" lead of a telephone line.
Positive Supply Voltage. +5V.
Internal Connection. This pin is cropped short.
Analog Ground. 4-Wire Ground. Normally connected to System Ground.
Loop Control (Input). A logic 0 activates internal circuitry which provides a line
termination across Tip and Ring. Used for seizing the line and dial pulsing.
Tip Feed. Connects externally to the RLS pin.
Internal Connection or No Pin Fitted. This pin is either cropped short or not fitted,
depending on the variant. See Note 1
Ringing Loop Sense. Connects externally to the TF pin.
Notes:
1. Variant 1, 4 BD-1 - pins 10,12, & 21 are cropped short. Pin 23 is not fitted.
2. Variant 2 - pin 23 is cropped short. Pins 10, 12 & 21 are not fitted.
3. Variant 3 - pins 12 and 21 are cropped short. Pins 10 and 23 are not fitted.
2-14
MH88422
Preliminary Information
Functional Description
Input Impedance
The device is a Data Access Arrangement (D.A.A.). It
is used to correctly terminate a 2-Wire analog loop. It
provides a signalling link and a 2-4 Wire line
interface between an analog loop and the
subscriber’s data transmission equipment such as
Modems, Facsimiles (Fax’s), Remote Metering and
Electronic Point of Sale equipment (EPOS).
The MH88422 is available in a number of different
variants each of which has its own fixed Tip-Ring AC
input impedance (Zin). Each variant is identified by
the final digit in its part number, as listed below. Also
shown are the countries whose PTT requirements
match these impedances.
Isolation Barrier
The device provides an isolation barrier implemented
by using optocouplers. This is a reinforced barrier for
an instantaneous power surge of up to 3kV r.m.s., for
example a lightning strike. It also provides full
isolation for a continuous AC voltage level of up to
250V r.m.s.
MH88422-1
Zin = 220Ω + 820Ω // 120nF
Australia / South Africa / Spain
MH88422BD-1 Zin = 220Ω + 820Ω // 115nF
German BABT ZV5
MH88422-2
North America
Zin = 600Ω
External Protection Circuit
MH88422-3
Zin = 370Ω + 620Ω // 310nF
UK / New Zealand
Should the input voltage from the line exceed that
isolated by the optocoupler, an External Protection
Circuit assists in preventing damage to the device
and the subscriber equipment. See Figure 3.
Many of these countries now pass equipment
approved to CTR21. The MH88422 will not meet this
specification. See the MH88437 datasheet for a
CTR21 Product.
Line Termination
Dummy Ringer
When Loop Control (LC) is at a logic 0, a line
termination is applied across Tip and Ring. The
device can be considered off-hook and DC loop
current will flow. The line termination consists of both
a DC line termination and an AC input impedance.
This device supports a dummy ringer option which
can be configured by the inclusion of external
components. Further details relating to component
values and configuration can be obtained from
MSAN-154. For example, Figure 3 shows capacitor
C2 which if set to 1.8µF would meet the New
Zealand dummy ringer requirements.
When LC is at a logic 1, a Dummy Ringer is applied
across Tip and Ring. The device can be considered
on-hook and negligible DC current will flow. The
dummy ringer is an AC load, which represents a
telephone’s mechanical ringer.
DC Line Termination
When LC is at a logic 0, an active termination is
applied across Tip and Ring, at which time it can be
considered to be in an off-hook state. This is used to
terminate an incoming call, seize the line for an
outgoing call, or if it is applied and disconnected at
the required rate, can be used to generate dial
pulses. This termination resembles approximately
300Ω resistance, which is loop current dependent.
2-4 Wire Conversion
The device converts the balanced 2-Wire input,
presented by the line at Tip and Ring, to a ground
referenced signal at VX, as required by modem/fax
chip sets.
Conversely the device converts the ground
referenced signal input at VR, to a balanced 2-Wire
signal across Tip and Ring.
During full duplex transmission, the signal at Tip and
Ring consists of both the signal from the device to
the line and the signal from the line to the device.
The signal input at VR, being sent to the line, must
not appear at the output VX. In order to prevent this,
2-15
MH88422
Preliminary Information
the device has an internal cancellation circuit. The
measure of attenuation is Transhybrid Loss (THL).
The Transmit (VX) and Receive (VR) signals are
ground referenced (AGND), and biased to 2.5V. The
device must be in the off-hook condition for
transmission or reception to take place.
Transmit Gain
The Transmit Gain of the MH88422 is the gain from the
differential signal across Tip and Ring to the ground
referenced signal at VX. The internal Transmit Gain of
the device is fixed and depends on the variant as
shown in the AC Electrical Characteristics table. For
the correct gain, the Input Impedance of the MH88422
variant used, must match the specified line
impedance.
By adding an external potential divider to VX, it is
possible to reduce the overall gain in the application.
The output impedance of VX is approximately 10Ω and
the minimum resistance from VX to ground should be
2kΩ.
Example: If R1 = R2 = 2kΩ, in Figure 3, the gain would
reduce by 6.0dB.
Receive Gain
The Receive Gain of the MH88422 is the gain from the
ground referenced signal at VR to the differential
signal across Tip and Ring. The internal Receive Gain
of the device is fixed as shown in the AC Electrical
Characteristics table. For the correct gain, the Input
Impedance of the MH88422 variant used, must match
the specified line impedance.
The input impedance to ground of VR is 47kΩ and this
can be used with an external series resistor to form a
potential divider and reduce the overall gain in the
application.
Example: If R3 = 100kΩ, in Figure 3, the Gain would
reduce by 3.0dB.
Supervisory Features
The device is capable of monitoring the line
conditions across Tip and Ring, this is shown in
Figure 3. The Ringing Voltage Loop Current detect
pin (RVLC), indicates the status of the device. The
RVLC output is at logic 0 when loop current flows,
indicating that the MH88422 is in an off hook state.
When the device is generating dial pulses, the RVLC
pin outputs a TTL pulse at the same rate.
An AC ringing voltage across Tip and Ring will cause
RVLC to output a TTL pulse at double the ringing
frequency with an envelope determined by the
ringing cadence.
Mechanical Data
See Figure 10, for details of the mechanical
specification.
MH88422
R2
26
TIP
24
20
C2
18
16
Notes:
1) R1, R2: Transmit Gain Resistors
2) R3: Receive Gain Resistor
C1
3) C1: 10µF 6V Tantalum
4) C2: Dummy Ringer Capacitor 250V
5) C3, C4: 10µF AC coupling Capacitors
R1
C3
Audio
Output
13
R3
C4
Audio
Input
VX
RLS
VR
Protection
Circuit
RING
TIP
11
TF
RVLC
7
TXIN
5
RING
LC
VDD
1
AGND
3
+
+5V
Figure 3 - Typical Application Circuit
2-16
Ring Voltage & Loop
Current Detect Output
Loop Control Input
MH88422
Preliminary Information
.
Absolute Maximum Ratings* - All voltages are with respect to AGND unless otherwise specified.
Parameter
1
DC Supply Voltage
2
Storage Temperature
3
DC Loop Voltage
4
Ringing Voltage
5
Loop Current
Symbol
Min
Max
Units
VDD
-0.3
6
V
TS
-55
+125
˚C
VBAT
-110
+110
V
VR
VR
-2
150
120
Vrms
Vrms
ILoop
-
90
mA
- 2 variant
- all other variants
*Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied.
Recommended Operating Conditions
Parameter
Sym
Min
Typ‡
Max
Units
1
DC Supply Voltages
VDD
4.75
5.0
5.25
V
2
Operating Temperatures
TOP
0
25
70
˚C
90
Vrms
Max
Units
17
Vrms
Vrms
15
Vrms
Vrms
7
Vrms
Vrms
3 Ringing Voltage
VR
75
‡ Typical figures are at 25˚C with nominal +5V supply and are for design aid only
Test Conditions
150 Vrms for -2 variant
Loop Electrical Characteristics †
Characteristics
1
Ringing Voltage
-1 Variant Only
4
Typ‡
VR
Test Conditions
Externally Adjustable See MSAN-154
35
No Detect
Detect
32
No Detect
Detect
14
Ringing Frequency
BD-1 Variant Only
All other Variants
23
15
28
68
Hz
Hz
Operating Loop Current
BD-1 Variant Only
All other Variants
20
15
80
80
mA
mA
28.8
V
V
Test circuit as Fig 4
ILoop=19mA (See Note 1)
ILoop=60mA
2.4
3.1
6.0
6.0
7.8
V
V
V
ILoop=15mA
ILoop=20mA (See Note 2)
ILoop=26mA
6.0
9.0
14.0
V
V
ILoop=15mA (See Note 3)
ILoop=90mA
6.0
6.0
10.8
27
V
V
ILoop=20mA (See Note 4)
ILoop=50mA
All other Variants
3
Min
No Detect
Detect
BD-1 Variant Only
2
Sym
Off-Hook DC Voltage
-1 Variant
6.0
-2 Variant
-3 Variant
BD-1 Variant
2-17
MH88422
Preliminary Information
Loop Electrical Characteristics † (continued)
5
Leakage Current
(Tip or Ring to AGND)
6
Leakage Current on-hook
(Tip to Ring)
7
DC Resistance during dialling
-1 Variant
All other Variants
8
Dial Pulse Distortion
BD-1 Variant ON
OFF
All other Variants ON
OFF
0
0
0
0
10
µA
100V DC
9
10
µΑ
VBAT = -50V
200
260
220
280
Ω
Ω
ILoop = 20 - 40 mA
+1
+1
+2
+2
+2
+2
+4
+4
ms
ms
ms
ms
† 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 1: Refer to FTZ 1TR2 section 2.2
Note 2: Refer to EIA/TIA 464 section 4.1.1.4.4
Note 3: Refer to BS6305 section 4.3.1
Note 4: Refer to ZV5 Annex 1
DC Electrical Characteristics †
Characteristics
1
2
3
RVLC
LC
Sym
Supply Current
IDD
Low Level Output Voltage
High Level Output Voltage
VOL
VOH
Low Level Input Voltage
High Level Input Voltage
Low Level Input Current
High Level Input Current
VIL
VIH
IIL
IIH
Min
Typ‡
Max
Units
1
5
mA
0.4
V
V
IOL = 4mA
IOH = 0.4mA
0.8
V
V
µA
µA
VIL = 0.0V
VIH = 5.0V
2.4
2.0
-60
60
† 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.
2-18
Test Conditions
VDD = 5.0V, On-hook
MH88422
Preliminary Information
AC Electrical Characteristics † - MH88422 All Variants
Characteristics
Sym
Min
Typ‡
Max
Units
1
Input Impedance VR
47k
Ω
2
Output Impedance at VX
10
Ω
3
Receive Gain (VR to 2-Wire)
4
Frequency Response Gain
(relative to Gain @ 1kHz)
All Variants
5
6
7
Signal Output Overload Level
at 2-Wire
at Vx
Total Harmonic Distortion
BD-1 Variant at 2-Wire
All other Variants at 2-Wire
All Variants
at VX
THD
Power Supply Rejection Ratio
BD-1 Variant at 2-Wire
at VX
PSRR
All other Variants
8
Transhybrid Loss
2.5
3.5
4.6
dB
Test circuit as Fig 6
Input 0.5V at 1kHz
-1
-1
0
0
+1
+1
dB
dB
300Hz
3400Hz
+2.0
+2.0
+3.0
+3.0
THL
dBm
dBm
THD < 5% @ 1kHz
ILoop = 20 to 40mA
Input -3.5dBm at 1kHz
1.2
1.2
1.2
at 2-Wire
at VX
Test Conditions
2.0
2.5
2.0
%
%
%
18
18
40
40
dB
dB
12
12
20
20
dB
dB
6
20
dB
Ripple 0.1Vrms 1kHz
on VDD
Test circuit as Fig 6
Input -3.5dBm,
300-3400Hz at VR
† 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 1: All of the above test conditions use a test source impedance which matches the device’s impedance.
Note 2: dBm is referenced to 600Ω unless otherwise stated.
2-19
MH88422
Preliminary Information
AC Electrical Characteristics† - MH88422-1
Characteristics
1
2
3
Sym
Return Loss at 2-Wire
(220Ω + 820Ω //120nF)
Min
Typ‡
20
20
20
22
24
26
dB
dB
dB
Test circuit as Fig 7
300-500Hz
500-2500Hz
2500-3400Hz
40
55
53
65
60
60
dB
dB
dB
Test circuit as Fig 8
50-300Hz
300-1000Hz
1000-4000Hz
5
Units
RL
Longitudinal to Metallic Balance
Idle Channel Noise
Test Conditions
Nc
at 2-Wire
at VX
4
Max
-79
-73
-72
-58
dBmp
dBmp
-1.4
-0.4
0.9
dB
Test circuit as Fig 5
Input 0.5V @ 1kHz
Off -Hook
-1.6
-2.1
-0.6
-0.5
0.4
0.9
dB
dB
300Hz
3400Hz
Transmit Gain (2-Wire to Vx)
Frequency Response Gain
(relative to Gain @ 1kHz)
† Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated.
‡ Typical figures are at 25C with nominal +5V and are for design aid only
Note 1: All of the above test conditions use a test source impedance which matches the device’s impedance.
AC Electrical Characteristics† - MH88422-2
Characteristics
1
Return Loss at 2-Wire
(Reference 600Ω)
Sym
Min
Typ‡
ERL
20
14
30
19
dB
dB
58
53
60
55
dB
dB
SFRL
2
Max
Units
Longitudinal to Metallic Balance
Metallic to Longitudinal Balance
60
40
3
Idle Channel Noise
5
Test circuit as Fig 7
500-2500Hz
200-3200Hz
Test circuit as Fig 8
200-1000Hz
1000-3000Hz
Test circuit as Fig 9
200-1000Hz
1000-4000Hz
Nc
at 2-Wire
at VX
4
dB
dB
Test Conditions
13
13
20
20
dBrnC
dBrnC
-1.4
-0.4
0.9
dB
Test circuit as Fig 5
Input 0.5V @ 1kHz
Off- Hook
-1.6
-2.1
-1.3
-0.5
0.4
0.9
dB
dB
200Hz
3400Hz
Transmit Gain (2-Wire to Vx)
Frequency Response Gain
(relative to Gain @ 1kHz)
† Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated.
‡ Typical figures are at 25C with nominal +5V supply and are for design aid only
Note 1: All of the above test conditions use a test source impedance which matches the device’s impedance.
2-20
MH88422
Preliminary Information
AC Electrical Characteristics† - MH88422-3
Characteristics
1
2
3
Sym
Return Loss at 2-Wire
(370Ω + 620Ω // 310nF)
Min
Typ‡
16
20
dB
Test circuit as Fig 7
200-4000Hz
50
60
dB
Test circuit as Fig 8
300-3400Hz
5
Units
RL
Longitudinal to Metallic Balance
Idle Channel Noise
Test Conditions
Nc
at 2-Wire
at VX
4
Max
-80
-80
-70
-68
dBmp
dBmp
-1.4
-0.4
0.9
dB
Test circuit as Fig 5
Input 0.5V @ 1kHz
Off-Hook
-1.6
-2.1
-1.3
-0.5
0.4
0.9
dB
dB
300Hz
3400Hz
Transmit Gain (2-Wire to Vx)
Frequency Gain
(relative to gain @ 1kHz)
†AC 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 1: All of the above test conditions use a test source impedance which matches the device’s impedance.
AC Electrical Characteristics† - MH88422BD-1
Characteristics
1
2
3
Sym
Return Loss at 2-Wire
(220Ω + 820Ω // 115nF)
Min
Typ‡
16
22
dB
30
40
46
65
60
60
dB
dB
dB
5
Units
RL
Longitudinal to Metallic Balance
Idle Channel Noise
Test circuit as Fig 7
300-3400Hz
Ref ZV5 Sec 2.5.2 and
2.8.3
Test circuit as Fig 8
50-300Hz
300-600Hz
600-4000Hz
Ref ZV5 Sec 2.8.2
-84
-75
-70
-70
dBmp
dBmp
-1.4
-0.4
0.9
dB
Test circuit as Fig 5
Input 0.5V @ 1kHz
Off-Hook
-1.6
-1.2
-1.3
-0.5
-0.4
0
dB
dB
300Hz
3400Hz
Transmit Gain (2-Wire to Vx)
Frequency Gain
(relative to gain @ 1kHz)
Test Conditions
Nc
at 2-Wire
at VX
4
Max
†AC 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 1: All of the above test conditions use a test source impedance which matches the device’s impedance.
2-21
MH88422
Preliminary Information
+5V
DUT
1
3
5
7
9
11
1uF
13
TIP
VDD
RLS
AGND
26
ILoop
24
IC 22
LC/
IC
TF 20
470nF
TXIN 18
VX
RING 16
VR
NC 14
RVLC/
Figure 4 - Test Circuit 1
-V
+5v
10H 500Ω
DUT
1
3
5
VDD
AGND
LC/
9 RVLC/
9
NC
11 VX
1uF
13
VR
100uF
TIP
RLS
IC
26
I=20mA
+
24
22
Vs
Impedance = Zin
TF 20
470nF
TXIN 20
100uF
RING 16
IC 14
10H 500Ω
V
Gain = 20 * Log (VX / Vs)
Figure 5 - Test Circuit 2
2-22
+
MH88422
Preliminary Information
-V
10H 500Ω
+5v
DUT
1
3
VDD
TIP
RLS
AGND
+
24
22
5 LC/
IC
7 RVLC/
TF 20
9
100uF
I=20mA
26
V (Zin)
470nF
NC
TXIN 18
11 VX
RING 16
100uF
+
1uF
13
Zin
NC 14
VR
10H 500Ω
Vs
Gain = 20 * Log (V(Zin) / Vs)
Figure 6 - Test Circuit 3
-V
10H 500Ω
+5v
DUT
1
3
VDD
AGND
I=20mA
TIP
RLS
100uF Zin
26
+
24
300Ω
V1
22
5 LC/
IC
7 RVLC/
TF 20
Vs
300Ω
470nF
9
IC
11 VX
1uF
13
VR
TXIN 18
100uF
RING 16
IC 14
10H 500Ω
+
Return Loss = 20 x Log (V1 / Vs)
Figure 7 - Test Circuit 4
2-23
MH88422
Preliminary Information
-V
10H 500Ω
+5v
DUT
1
VDD
3
5
TIP
RLS
AGND
IC
LC/
100uF
I=20mA
26
+
24
300Ω
22
V1
TF 20
7 RVLC/
300Ω
470nF
9
TXIN
IC
18
100uF
RING 16
11 VX
1uF
13
VR
Vs
10H 500Ω
IC 14
+
Long. to Met. Balance = 20 * Log (V1 / Vs)
Figure 8 - Test Circuit 5
-V
10H 500Ω
+5v
DUT
1
3
5
VDD
AGND
LC/
7 RVLC/
TIP
RLS
IC
I=20mA
26
100uF
+
24
300Ω
22
Vs
TF 20
300Ω
470nF
9
IC
11 VX
1uF
13
VR
TXIN
18
100uF
RING 16
IC 14
+
10H 500Ω
Met. to Long. Balance = 20 * Log (V1 / Vs)
Figure 9 - Test Circuit 6
2-24
510Ω
V1
MH88422
Preliminary Information
0.19 Max (4.8 Max)
0.27 Max
(6.9 Max)
0.063 Max
(1.6 Max)
0.08 Typ (2 Typ)
0.90 Typ *
(22.9 Typ)
* 0.20+0.01
* 0.10 Typ
(5.08+0.25)
(2.54 Typ)
0.020 + 0.005
(0.5 + 0.12)
0.95 Max
(24.2 Max)
0.26+0.015
(6.6+0.4)
1.42 Max
(36.1 Max)
Notes:
1) Not to scale
2) Dimensions in inches.
(Dimensions in millimetres)
3) Pin tolerances are non-accumulative.
4) Recommended soldering conditions:
Wave soldering - Max temp at pins 260˚C for 10 secs.
* Dimensions to centre of pin.
5) Short-cropped pins differ between variants.
(see pin description) 1 & BD-1 variant short.
1
Figure 10 - Mechanical Data for 26-Pin DIL Hybrid
2-25
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