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High Impedance-Local Area Network Driver Hybrid

MTI A60152-10-01 Low Profile,Straght Edge PinsNow available in ROHS compliant version

INTRODUCTION

MTI´s HI-LAND, High Impedance-Local Area Network Driver. is for use in coaxial, baseband local area networks. It is compatible with Standard Microsystems and NCR ARCNET monolithic chipsets.
The LAND is a Thick Film hybrid circuit which offers significant space savings where printed board real estate is at a premium.
The hybrid replaces nearly 30 discrete components. The LAND is available in a low profile package with straight edge pins for card cage situations.

FUNCTIONAL DESCRIPTION

The modular Interface for Local Area Networks consists of two high current drivers, driving the primary of a pulse transformer through a low pass filter. The primary of the pulse transformer becomes the secondary, when receiving externally generated signals. It is attached to a receive filter and amplifier, whose filter characteristics are matched to the signal being received to improve signal to noise ratio. The output of the pulse transformer (input when receiving) is connected to 93Ohm coax cable through a BNC-connector. A -12 to -5Volt dropping circuit is also provided. Performance of this microcircuit is dependent on a quality grounding technique and adequate supply voltage decoupling.

ELECTRICAL CONNECTIONS

The hybrid provides 20 electrical pins. Five of these pins are optional test points only. No electrical connection should be made to these test pins in the ARCNET application.
    

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PIN

PIN NAME

DESCRIPTION/APPLICATION

 1

-12V Return

Ground if using a -12V supply. If not this Pin must have no connection

 2

-12V Supply

Connect to -12V supply for this option. If negative supply is -5V, do not connect the Pin

 3

-5V Supply

Connect -5V supply here. If  negative supply is -12V, do not connect the Pin

 4

Ground

Circuit Ground

 5

Threshold 

Receive comparator threshold voltage

 6

+5V Supply

Connect to well-decoupled +5Volt supply line

 7

RX

Received Signal-goes to TTL level receiver protocol circuitry

 8

Test Point

No Connection

 9

Test Point

No Connection

10

Test Point

No Connection

11

OUT/S

Shield/Connect to RG-62 coaxial cable outer conductor

12

OUT/C

Center/Connect to RG-62 coaxial cable center conductor

13

Ground

Circuit Ground

14

Ground

Circuit Ground

15

Test Point

No Connection

16

Test Point

No Connection

17

Ground

Circuit Ground

18

Pulse 2

TTL level input to the transmitter section

19

Disable

Transmitter disable function, normally connected to ground. +5V disables the transmitter

20

Pulse 1

TTL level input to the transmitter section

  

DC POWER

The hybrid operates from +5Volt and -12Volt, +5Volt and -5Volt as follows:
 

+5Volt +/- 5%

0,45A peak/0,15A max. typ.

-12Volt +/-10%

0,15 A max.

 

+5Volt +/- 5%

0,45A peak/0,15A max. typ.

-5Volt +/-5%

0,15 A max.

 

Maximum Ripple and Noise

1% peak to peak

Heat Dissipation

1 Watt max.

INPUT/OUTPUT ELECTRICAL CHARACTERISTICS
 

PULS1,2

Each input represents one standard TTL load

DISABLE

Represents two standard TTL loads

RX

Transitor driver output with 470Ohm Pull-Up resistor,  driving 4 standard TTL loads minimum

OUT/S, OUT/C

Transformer coupled input/output. Connect to 93Ohm RG-62-coax-cable through BNC-Connector. 
Transmitted signal is approximately a 20Volt peak to peak bipolar pulse into 46,5Ohm load. 
The received pulse width depends on cable attenuation.

 
ENVIRONMENTAL CHARACTERISTICS

Temperature, Ambient
Operating: 0°C to +70°C
Nonoperating Storage: -40°C to +150°C
Relative Humidity
Operating: 5% to 95%
Nonoperating: 0% to 100%
The hybrid is capable of withstanding, without damage or degradation, normal printed circuit wavesoldering and cleaning operations.

TEST CONDITIONS

a.) The following terminals are tied to circuit Ground: Pins1,4,13,14,17.
b.) Pin 2 is tied to a -12Volt supply referenced to circuit Ground.
c.) Pin 6 is tied to a +5Volt supply, that is set to +4.75volts.
d.) Pin 19, disable, is connected to a signal source, that can be switched between a TTL "0"- and a TTL "1" level.
e.) Pins 18 and 20 are connected to a suitable signal source. Pulse1, Pulse2 are 100nanosecond pulses (-0, +5ns). The trailing
edge of Puls1 and the leading edge of Puls2 are coincident with no overlap and no more than 5ns of delay (-0, +5ns).

SIGNAL MESUREMENT

The measured test parameters are given in Test-Parameter Table.
The XMIT signal is measured at Pin 12, with respect to Pin 11 on the transmitting hybrid.
The received pulse, TRX, is measured at Pin 7, with respect to signal Ground on the receiving hybrid.

TEST PARAMETERS
 

PARAMETER

SYMBOL

UNITS

MIN

TYP

MAX

Output Transmitted Signal Positive Peak

V1

Volts

8.0

10.0

.

Output Transmitted Signal Negative Peak

V2

Volts

-8.0

-10.0

.

Local Signal, Digitized Pulse Width

T1

nsec

.

105

.

Received Signal, Attenuated and digitized, Pulse Width (Measurement at 1,5V)

TRX

nsec

20

50

.

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