Datasheet MH88435AS-P, MH88435AS-PI, MH88435AD-PI, MH88435AD-P Datasheet (MITEL)

MH88435-P

Data Access Arrangement

Preliminary Information

Features

• FAX and Modem interface V.34(33k6)

• Externally programmable line and network
balance impedances

• Programmable DC termination characteristics

• IEC950 recognised component

• Transformerless 2-4 Wire conversion

• Integral Loop Switch

• Dial Pulse and DTMF operation

• Accommodates parallel phone detection

• Line state detection outputs:­loop current/ringing voltage/line voltage

• Single +5V operation, low on-hook power
(35mW)

• Full duplex voice and data transmission

• On-Hook reception from the line

• Approvable to UL1950

• Industrial temperature range available

Applications

Interface to Central Office or PABX line for:

• FAX/Modem (including software modems)

• Electronic Point of Sale

• Security System

• Telemetry

• Set Top Boxes

DS5132 ISSUE 8 July 1999

Package Information

MH88435AD-P 28 Pin DIL Package

MH88435AS-P 28 Pin SM Package

0°C to +70°C

MH88435AS-PI 28 Pin SM Package
MH88435AD-PI 28 Pin DIL Package

-40°C to +85°C

Description

The Mitel MH88435 Data Access Arrangement
(D.A.A.) provides a complete interface between
audio or 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.

The impedance and network balance are externally
programmable, as are the DC termination
characteristics, making the device suitable for most
countries worldwide.

TIP

RING

VLOOP1
VLOOP2

Input Buffer

&

Line Termination

Network Connections

Figure 1 - Functional Block Diagram

Isolation Barrier

Opto-

Isolation

Isolation

Isolation

Isolation

Logic Input

Buffer

Analog

Buffer

Analog

Buffer

Ring & Loop

Buffer

THL cancellation

and line

impedance

matching

User Connections

circuit

VCC
VBIAS
AGND

LC
VR+
VR-

NB1
NB2

VX
ZA
RV

LCD
LOOP

RS

2-39

MH88435-P Preliminary Information

NB1
NB2
VR+

VR-

VX
LC
ZA

AGND

VCC

VBIAS

LOOP

RS

1
2
3
4
5
6
7
8
9
10
11
12

IC

13
14

IC

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

TIP
RING

IC
VLOOP1

VLOOP2
IC
SC
SC
IC
NP
NP
IC
RV
LCD

Figure 2 - Pin Connections

Pin Description

Pin # Name Description

1 NB1 Network Balance 1. External passive components must be connected between this pin

and NB2.

2 NB2 Network Balance 2. External passive components must be connected between this pin

and NB1.
3 VR+ Differential Receive (Input). Analog input from modem/fax chip set.
4 VR- Differential Receive (Input). Analog input from modem/fax chip set.
5VXTransmit (Output). Ground referenced (AGND) output to modem/fax chip set, biased at

+2.0V.
6LCLoop Control (Input). A logic 1 applied to this pin activates internal circuitry which

provides a DC termination across Tip and Ring. This pin is also used for dial pulse

application.
7ZALine Impedance. Connect impedance matching components from this pin to Ground

(AGND).
8 AGND Analog Ground. 4-Wire ground. Connect to earth.
9VCCPositive Supply Voltage. +5V.

10 VBIAS Internal Reference Voltage. +2.0V reference voltage. This pin should be decoupled

externally to AGND, typically with a 10µF 6.3V capacitor.

11 LOOP Loop (Output). The output voltage on this pin is proportional to the line voltage across Tip

- Ring, scaled down by a factor of 50.

12,

IC Internal Connection. No connection should be made to this pin externally.
14,
17,
20,
23,
26

13 RS Ringing Sensitivity. Connecting a link or resistor between this pin and LOOP (pin 11) will

vary the ringing detection sensitivity of the module.
15 LCD Loop Condition Detect (Output). Indicates the status of loop current.
16 RV Ringing Voltage Detect (Output). The RV output indicates the presence of a ringing

voltage applied across the Tip and Ring leads.

2-40

Preliminary Information MH88435-P

Pin Description (continued)

18,

19

21,

22
24 VLOOP2 Loop Voltage Control Node 2. Used to set DC termination characteristics.

25 VLOOP1 Loop Voltage Control Node 1. Used to set DC termination characteristics.
27 RING Ring Lead. Connects to the “Ring” lead of the telephone line.
28 TIP Tip Lead. Connects to the “Tip” lead of the telephone line.

Functional Description

The device is a Data Access Arrangement (D.A.A.). It
is used to correctly terminate a 2-Wire telephone
line. It provides a signalling link and a 2-4 Wire line
interface between an analog loop and subscriber
data transmission equipment, such as Modems,
Facsimiles (Fax’s), Remote Meters, Electronic Point
of Sale equipment and Set Top Boxes.

NP No Pin. Isolation barrier, no pin fitted in this position.

SC Short Circuit. These two pins should be connected to each other via a 0Ω

link.

France’s current limit specification and Germany’s
dial pulse requirements are met by the MH88437.
This device is pin for pin compatible with the
MH88435.

Approval specifications are regularly changing and
the relevant specification should alw ays be consulted
before commencing design.

Line Termination

Isolation Barrier

When Loop Control (LC) is at a logic 1, a line

The device provides an isolation barrier capable of
meeting the supplementary barrier requirements of
the international standard IEC 950 and the national
variants of this scheme such as EN 60950 for
European applications and UL 1950 for North
American applications and is classified as a Telecom
Network Voltage (TNV) circuit.

termination is applied across Tip and Ring. The
device is off-hook and DC loop current will flow. The
line termination consists of both a DC line
termination and an AC input impedance. It 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.

External Protection Circuit

An External Protection Circuit assists in preventing
damage to the device and the subscriber equipment,
due to over-voltage conditions. See Application Note,
MSAN-154 for recommendations.

Suitable Markets

The MH88435 has features such as programmable
input and network balance impedance,
programmable DC termination and a supplementary
isolation barrier that makes it ideal for use
throughout the world.

There are a small number of countries with a 100MΩ
leakage requirement that this device does not meet.
These are Belgium, Greece, Italy, Luxembourg and
Spain.

The DC termination is approximately 300Ω
resistance, which is loop current dependent. It can
be programmed to meet different national
requirements. For normal operation Pin 22 and Pin
21 should be linked, and a resistor (R2) should be
fitted between VLOOP1 and VLOOP2 as shown in
Figure 5.

The approval specification will give a DC mask
characteristic that the equipment will need to comply
to. The DC mask specifies the amount of current the
DAA can source for a given voltage across tip and
ring. Figure 3 shows how the voltage across tip and
ring varies with different resistors (R2) for a given
loop current.

The AC input impedance should be set by the user to
match the line impedance.

2-41

MH88435-P Preliminary Information

30

25

20

(V(t-r)

15

10

5

0

200 600 1000 1400 1800 2200 2600 3000 3400 3800

Iloop=26mA

Iloop=15mA

Iloop=20mA

R2(kOhms)

Figure 3 - DC Programming Capabilities

Input Impedance

Where the input impedance (Z) = 600R the equation
can be simplified to:

The MH88435 has a programmable input impedance
set by fitting external components between the ZA

Zext = (10 x Z) - 1k3Ω

pin and AGND.

Zext = 4k7Ω

For complex impedances the configuration shown in
Figure 4 is most commonly found.

Note: A table of commonly used impedances can be
found in the DAA Application’s document MSAN-154.

ZA

Zext = external network connected between ZA and

R1

R2

AGND, Zint = 1.3kΩ (internal resistance).

C1

Figure 4 - Complex Impedances

To find the external programming components for
configuration 4, the following formula should be
used:

Zext = [(10 x R1)-1k3]+ [10 x R2)//(C1/10)]

e.g. If the required input impedance = 220Ω +
(820Ω//115nF), the external network to be connected
to ZA will be:

Zext = 900Ω + (8k2Ω//12nF)

2-42

Network Balance

The network balance impedance of the device can
be programmed by adding external components
between NB1 and NB2. For countries where the
balance impedance matches the line impedance, a
15kΩ resistor should be added between NB1 and
NB2.

Ringing Voltage Detection

The sensitivity of the ringing voltage detection
circuitry can be adjusted by applying an external
resistor between the RS and LOOP pins. With a
short circuit, the threshold sensitivity is ~10Vr ms R7
can be calculated using the equation:

Preliminary Information MH88435-P

R7 = 30 kΩ x (Desired Threshold Voltage - 10Vrms)

Therefore, 300k kΩ gives ~ 20Vrms and 600k kΩ
gives ~ 30Vrms

An AC ringing voltage across Tip and Ring will cause
RV to output TTL pulses at the ringing frequency,
with an envelope determined by the ringing cadence.

Parallel Phone and Dummy Ringer

An external parallel phone or dummy ringer circuit
can be connected across Tip and Ring as shown in
Figure 5. A dummy ringer is an AC load which
represents a telephone’s mechanical ringer.

In normal circumstances when a telephone is on­hook and connected to the PSTN, its AC (Ringer)
load is permanently presented to the network. This
condition is used by many PTT’s to test line
continuity by placing a small AC current onto the line
and measuring the voltage across tip (A) and ring
(B).

Today’s telecom equipment may not have an AC load
present across tip and ring (e.g. modems), therefore
any testing carried out by the PTT will see an open
circuit across tip and ring. In this instance the PTT
assumes that the line continuity has been damaged.

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, biased at 2.0V. This
simplifies the interface to a modem chip set.

Conversely, the device conv erts the differential signal
input at VR+ and VR- to a balanced 2-Wire signal
across Tip and Ring. The device can also be used in
a single ended mode at the receive input, by leaving
VR+ open circuit and connecting the input signal to
VR- only. Both inputs are biased at 2.0V.

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+ and VR- being sent to the
line, must not appear at the output VX. In order to
prevent this, the device has an internal cancellation
circuit. The measure of this attenuation is
Transhybrid Loss (THL).

The MH88435 has the ability to transmit analog
signals from Tip and Ring through to VX when on­hook. This can be used when receiving caller line
identification information.

Transmit Gain

To overcome this problem many PTT’s specify that a
"Dummy Ringer" is presented to the network at all
times. Ideally its impedance should be neglible in
the audio band, and high at the ringing frequencies
(e.g. 25Hz). Note that the requirement for the
"Dummy Ringer" is country specific.

Parallel phone detection is used mostly in set-top
box applications. This is when a modem call will
need to be disconnected from the central office by
the equipment when the parallel phone is in the off­hook state. This is so that a call can be made to the
emergency services.

To detect this state, additional circuitry will be
required and can be found in the application note,
MSAN-154.

The Transmit Gain of the MH88435 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 as shown in the AC Electrical
Characteristics table. For the correct gain, the Input
Impedance of the MH88435, 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 R3 = R4 = 2kΩ, in Figure 5, the overall
gain would reduce by 6.0dB.

2-43

MH88435-P Preliminary Information

Receive Gain

The Receive Gain of the MH88435 is the gain from
the differential signal at VR+ and 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 MH88435 must
match the specified line impedance.

With an internal series input resistance of 47kΩ at
the VR+ and VR- pins, external series resistors can
be used to reduce the overall gain.

Overall Receive Gain = 0dB + 20log (47kΩ /
(47kΩ+R5)).

For differential applications R6 must be equal to R5
in Figure 5.

Example: If R5 = R6 = 47k in Figure 5, the overall
gain would reduce by 6.0dB.

Mechanical Data

See Figure 12, 13 and 14 for details of the
mechanical specification.

Supervisory Features

The device is capable of monitoring the line
conditions across Tip and Ring, this is shown in
Figure 5. The Loop Condition Detect pin (LCD),
indicates the status of the line. The LCD output is at
logic 1 when loop current flows, indicating that the
MH88435 is in an off-hook state. LCD will also go
high if a parallel phone goes off-hook while the DAA
is on-hook. Therefore, line conditions can be
determined with the LC and the LCD pins.

The LOOP pin output voltage, VLoop, is proportional
to the line voltage across Tip and Ring, V (t-r),
scaled down by a factor of 50 and offset by VBias
which is approximately 2V. With the aid of a simple
external detector the LC, LCD and LOOP pins can
be used to generate the signals necessary for
parallel phone operation with a Set Top Box. Refer to
MSAN-154.

If Tip is more positive than ring VLoop < VBias
If Tip is more negative than ring VLoop > VBias

V (t-r) ≈ (VLoop - VBias) * 50

When the device is generating dial pulses, the LCD
pin outputs TTL pulses at the same rate. The LCD
output will also pulse if a parallel phone is used to
pulse dial and also when ringing voltage is present at
Tip and Ring.

2-44

Preliminary Information MH88435-P

+5V

TIP

D2

RING

R1

D1

C1

L1

C7

= Ground (Earth)

C2

C8

L2

LCD

NB1

NB2

Zext

11

RS

VX

VR-

VR+

RV

LC

R7

LOOP

5
4

3

16

15
6

1

2

R4

R3

R5

R6

ZB

Notes:

typically 0.39µF, 250V & 3kΩ

3) R3 & R4: Transmit Gain Resistors ≥ 2k2

5) ZB: Network Balance Impedance

6) C2, C6 = 10µF 6V

7) C7 & C8 = 39nF for 12kHz filter and 22nF for
16KHz filter. These can be left off if meter pulse
filtering not required.

8) Zext: External Impedance

10) L1, L2 = 4m7H 80mA. These can be left off if

11) C3, C4 & C5 = 1µF coupling capacitors

12) R7 = 620kΩ (30V RMS ringing sensitivity)

13) D2 = Teccor P3100SB

C3

Analog
Output

C4

Analog
Input

C5

Analog
Input

Ringing Voltage Detect Output

Loop Current Detect Output

Loop Control Input

1) R1 & C1: Dummy Ringer, country specific

2) R2: DC Mask Resistor typical 360kΩ

4) R5 = R6: Receive Gain Resistors typically 100k

9) D1 Zener Diode 6V2
meter pulse filtering not required.

VLOOP1

AGND

8

R2

22

VLOOP2

MH88435

VBIAS

10

C6

+

21

13

ZA

7

+

9

25 24

VCC

28

TIP

27

RING

Figure 5 - Typical Application Circuit

2-45

MH88435-P Preliminary Information

Absolute Maximum Ratings* - All voltages are with respect to AGND unless otherwise specified.

Parameter Sym Min Max Units Comments

.

1 DC Supply Voltage V
2 Storage Temperature T
3 DC Loop Voltage V
4 Ringing Voltage V
5 Loop Current I
6 Ring Trip Current I

TRIP

CC

S

BAT

R

Loop

-0.3 6 V

-55 +125 ˚C

-110 +110 V
150 Vrms VBAT = -56V

90 mA

180 mA

rms

250ms 10% duty cycle or

500ms single shot

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

Recommended Operating Conditions

Parameter Sym Min Typ‡Max Units Test Conditions

1 DC Supply Voltages V
2 Operating Temperatures

T

Industrial Temperature

3 Ringing Voltage V

‡ Typical figures are at 25˚C with nominal +5V supply and are for design aid only

Loop Electrical Characteristics

† -

4.75 5.0 5.25

CC
OP

0

-40

R

25 70

75 90 Vrms

+85

V

˚C

Characteristics Sym Min Typ‡Max Units Test Conditions

1 Ringing Voltage threshold VR

Externally Adjustable

71014Vrms
2 Ringing Frequency 15 68 Hz
3 Operating Loop Current 15 80 mA Note 3
4 Off-Hook DC Voltage

Tip/Ring 6.0

5 Leakage Current

(Tip or Ring to AGND)

6.0

7.8
10

7

V
V
V

µA

mA

Test circuit as Fig. 4
I

=15mA )Note 1

Loop

I

=20mA )where R2

Loop

=I

=26mA ) 360kΩ

Loop

100V DC Note 2.
1000V AC

rms

6 Leakage Current on-hook

910µAV

BAT

= -50V

(Tip to Ring)

7 Dial Pulse Delay ON

OFF

8 Loop Condition Detect Threshold

Off-Hook

†

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 EIA/TIA 464 section 4.1.1.4.4.
Note 2: This is equivalent to 10MΩ leakage Tip/Ring to Ground. For countries requiring 100MΩ leakage use the MH88436 with an
enhanced leakage specification.
Note 3: Operation at low loop currents depends on the DC programming resistor between VLoop1/2. The recommended 360K value
will support V34 operation down to 20mA. Voice operation is supported down to 15mA.

0
0

+2
+2

+4
+4

ms
ms

516VVoltage across tip and

ring

2-46

Preliminary Information MH88435-P

Variations from Standard Loop Electrical Characteristics ­(MH88435AD-PI/MH88435AS-PI)

Characteristics Sym Min Typ Max Units Test Conditions

1

Ringing Voltage Threshold VR 17 Vrms -40˚C to 0˚C

2

Operating Loop Current 22 80 mA

DC Electrical Characteristics

†

Characteristics Sym Min Typ‡Max Units Test Conditions

1 Supply Current I
2RV,

LCD

Low Level Output Voltage
High Level Output Voltage

3 LC Low Level Input Voltage

High Level Input Voltage
Low Level Input Current
High Level Input Current

†

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.

AC Electrical Characteristics

†

CC

V

OL

V

V

V

I

OH

I

IL
IH

2.4

IL

2.0

IH

Characteristics Sym Min Typ

1 Input Impedance VR-

VR+

7mA

0.4 V
V

0.8

V
V

0

350

10

µAµAVIL= 0.0V

400

‡

Max Units Test Conditions

47k
94k

-40˚C to 0˚C

+70˚C to +85˚C

VCC = 5.0V, On-hook
IOL= 4mA

IOH= 0.4mA

VIH= 5.0V

Ω
Ω

2 Output Impedance at VX 10 Ω
3 Receive Gain (VR to 2-Wire) -1 0 1

dB

Test circuit as Fig. 8
Input 0.5V at 1kHz

4 Frequency Response Gain

(relative to Gain @ 1kHz)

5 Signal Output Overload Level

at 2-Wire
at VX

6 Signal/Noise & Distortion

at 2-Wire
at VX

7 Power Supply Rejection Ratio

at 2-Wire
at VX

SINAD

PSRR

-0.5

-0.5

25
25

+0.40+0.5

+0.5

0
0

70
70

40
40

dB
dB

dBm
dBm

dB
dB

dB
dB

300Hz
3400Hz

THD < 5% @ 1kHz

I

= 25-75mA

LOOP

Input 0.5V at 1kHz

I

= 25-75mA

LOOP

300-3400Hz
Ripple 0.1Vrms 1kHz

on V

CC

8 Transhybrid Loss THL 16 25 dB Test circuit as Fig.8

300-3400Hz at V

9 2-Wire Input Impedance Zin Note 3 Ω @1kHz

10 Return Loss at 2-Wire

(Reference 600Ω)

RL

14
20
18

20
24
24

dB
dB
dB

Test circuit as Fig. 9
200-500Hz
500-2500Hz
2500-3400Hz

R

2-47

MH88435-P Preliminary Information

AC Electrical Characteristics

Characteristics Sym Min Typ

11 Longitudinal to Metallic Balance

Metallic to Longitudinal Balance

12 Idle Channel Noise

at 2-Wire
at 2-Wire

13 Transmit Gain (2-Wire to VX)

(Terminated gain) Off-Hook
(Voltage gain) On-Hook

14 Frequency Response Gain

(relative to Gain @ 1kHz)

15 Intermodulation Distortion

products at VX and 2W

†

at VX
at VX

Nc

IMD

46
46

60
40

-1 0

-1

-1

+0.3
+0.2

‡

Max Units Test Conditions

65
65

68
62

10
10

-80

-80

2020dBrnC

dB
dB

dB
dB

dBrnC

dBm
dBm

+1 dB

0

+1
+1

dB
dB

dB

60 dB I

Test circuit as Fig. 10
300-1000Hz
1000-3400Hz
Test circuit as Fig.11
200-1000Hz
1000-4000Hz

Cmess filter
300-3400Hz filter

Test circuit as Fig. 7
Input 0.5V @ 1kHz

LC = 0V
300Hz

3400Hz

= 25-75mA

LOOP

F1 = 1kHz at -6dBm
F2 = 800Hz at -6dBm
Total signal power =

-3dBm

16 Distortion at VX due to near end

echo
(300Hz - 3400Hz bandwidth)

75 dB I

LOOP

F1 = 1kHz at -6dBm
F2 = 800Hz at -6dBm
Total signal power =

-3dBm

17 Common Mode Rejection on 2 wire

at VX

18 Common Mode overload level

CMRR

CMOL

56 dB Test circuit as Fig. 10

1-100Hz. Note 4

7 Vrms Test circuit as Fig. 10.

Note 4

†

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.
Note 3: These parameters need to be taken into consideration when designing or specifying the power supply.

Variations from Standard AC Electrical Characteristics
(MH88437AD-PI/MH88437AS-PI) (-40˚C to 0˚C)

Characteristics Sym Min Typ Max Units Test Conditions

1 Frequency Response Gain -0.6

-0.65

dB 300Hz (-40˚C to 0˚C)

= 25-75mA

2-48

Preliminary Information MH88435-P

= Ground (Earth)

5V

360K

13

RS

MH88435

VCC ZA

AGNDRV

8

5V

VBIAS

9

21
22

24
25

1K

3

VR+

4

VR-

5

VX
SC
SC

VLOOP2
VLOOP1

11

LOOP

LC

616

Figure 6 - Test Circuit 1

15

LCD

TIP

NB1

NB2

RING

7

4.7K

28
1

2

27

10

ILOOP

15K

10uF

= Ground (Earth)

360K

5V

Gain = [20 * Log (VX / Vs)] + 6.02 dB

1K

3
4

5
21
22

24
25

VR+
VR-

VX
SC
SC

VLOOP2

VLOOP1

11

LOOP

LC

616

LCD

NB1

NB2

RING

VBIAS

VCC ZA

9

5V

15

TIP

7

4.7K

28
1

2

27

10

10uF

13

RS

MH88435

AGNDRV

8

Figure 7 - Test Circuit 2

15K

-V

10H 500Ω

I=20mA

10H 500Ω

100uF

+

100uF

+

Vs

Impedance = Zin

2-49

MH88435-P Preliminary Information

-V

= Ground (Earth)

Vs

360K

5V

Gain = 20 * Log (V(Zin) / Vs)

21
22

24
25

1K

3

VR+

4

VR-

5

VX

SC
SC

VLOOP2
VLOOP1

LCD

RING

VBIAS

VCC ZA

9

5V

15

TIP

NB1

NB2

7

4.7K

11

LOOP

LC

616

13

RS

MH88435

AGNDRV

8

Figure 8 - Test Circuit 3

28
1

2

27

10

10uF

15K

10H 500

I=20mA

10H 500Ω

Ω

100uF

+

Zin

100uF

+

= Ground (Earth)

11

LOOP

3

VR+

4

VR-

5

VX

21

SC

22

SC

360K

24

VLOOP2

25

VLOOP1

LC

5V

1K

Return Loss = 20 * Log (2V1 / Vs)

616

13

RS

MH88435

VCC ZA

AGNDRV

8

5V

15

LCD

28

TIP

1

NB1

15K

2

NB2

27

RING

10

9

VBIAS

7

4.7K

10uF

Figure 9 - Test Circuit 4

-V

I=20mA

10H 500Ω

10H 500Ω

100uF

+

100uF

+

V1

Zin

300Ω

300Ω

Vs = 0.5V

2-50

Preliminary Information MH88435-P

-V

= Ground (Earth)

21
22

360K

24
25

5V

Long. to Met. Balance = 20 * Log (V1 / Vs)

CMR = 20 * Log (VX / Vs)
CMOL = V2

1K

3

VR+

4

VR-

5

VX
SC
SC

VLOOP2

VLOOP1

11

LOOP

LC

616

MH88435

AGNDRV

RS

LCD

NB1

NB2

RING

VBIAS

VCC ZA

9

5V

15

TIP

7

4.7K

28
1

2

27

10

10uF

13

8

Figure 10 - Test Circuit 5

15K

V2

10H 500Ω

I=20mA

V1

10H 500

100uF

100uF

Ω

+

300

Ω

300Ω

+

Vs = 0.5V

= Ground (Earth)

11

LOOP

3

VR+

4

VR-

5

VX

21

SC

22

SC

360K

24

VLOOP2

25

VLOOP1

LC

5V

1K

Met. to Long. Balance = 20 * Log (V1 / Vs)

616

13

RS

MH88435

AGNDRV

8

LCD

NB1

NB2

RING

VBIAS

VCC ZA

9

5V

15

TIP

7

4.7K

28
1

2

27

10

10uF

15K

-V

10H 500

I=20mA

10H 500

Ω

Ω

100uF

100uF

+

+

300Ω

300Ω

510Ω

Vs

V1

Figure 11 - Test Circuit 6

2-51

MH88435-P Preliminary Information

0.162 Max (4.12 Max)

0.27 Max
(6.9 Max)

0.063 Max

(1.6 Max)

0.05 Typ

0.300+0.010
(7.62+0.25)

0.260+0.015
(6.6+0.38)

1.00 Typ

(25.4 Typ)

1.05 Max

(26.7 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.

*

0.08 Typ (2 Typ)

*

0.100+0.010
(2.54

+0.25)

1

0.020 + 0.005
(0.5 + 0.13)

1.42 Max

(36.1 Max)

*

(1.27 Typ)

*

Figure 12 - Mechanical Data for 28 Pin DIL Hybrid

0.99 Typ

(25.15 Typ)

0.060 Typ

(1.52 Typ)

Notes:

1) Not to scale

2) Dimensions in inches.

(Dimensions in millimetres)

3) Pin tolerances are non-accumulative.

4) Recommended soldering conditions:
Max reflow temp: 220˚C for 10 secs.

* Dimensions to centre of pin.

0.287 Max
(7.29 Max)

0.110+0.015

1.15 Max

(29.2 Max)

(2.80+0.38)

*

0.100+0.010
(2.54+0.25)

1

0.020 + 0.005
(0.5 + 0.13)

*

0.300+0.010
(7.62+0.25)

1.42 Max

(36.1 Max)

0.162 Max (4.11 Max)

0.063 Max

(1.6 Max)

*

0.05 Typ

(1.27 Typ)

2-52

Figure 13 - Mechanical Data for 28 Pin Surface Mount Hybrid

Preliminary Information MH88435-P

0.10

0.10

(2.54)

Notes:

1) Not to scale

2) Dimensions in inches.
(Dimensions in millimetres)

3) All dimensions are Typical except
where marked with an .This gap is
associated with the isolation barrier.

(2.54)

0.04

(1.02)

0.06

(1.52)

*

0.26

(6.60)

0.99

(25.15)

Figure 14 - Recommended Footprint for 28 Pin Surface Mount Hybrid

2-53

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