4610M-901-104 datasheet(49/62 Pages) BOURNS

Part #	4610M-901-104

Description	Resistor Networks Product Selection Guide

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Manufacturer	BOURNS [Bourns Electronic Solutions]

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Specifications are subject to change without notice.

325

R1 and R2 are calculated using the following equations:

R2 = (Vee/Vtt)*Zo

R1 = (R2*Vtt)/(Vee-Vtt)

For a 10K ECL supply voltage of -5.2V and Vtt of -2V:

R2 = 2.6*Zo

R1 = R2/1.6

For a 100K ECL supply voltage of -4.5V and Vtt of -2V:

R2 = 2.25*Zo

R1 = R2/1.25

Thevenin Equivalent Parallel Termination Technique

References:

1. Blood, W.R., MECL System Design Handbook, Motorola,

Inc., 1983.

2. F100K ECL Data Book, Fairchild Semiconductor Corp.,

1986.

3. MECL Device Data, Motorola, Inc., 1987.

4. ECLinPS Data, Motorola, Inc., 1987.

Bourns 801, 802, and 804 conformal coated SIP resistor

capacitor networks are designed to terminate 6 transmission

lines using the parallel termination technique. A 0.01 µF capaci-

tor(s) is provided in each network to help maintain a solid Vtt

level within the package, mitigating any potential cross talk or

feedthrough effects. The 804 circuit also contains a 0.1 µF

capacitor for bypassing the Vee supply.

Parallel Termination Technique

Thevenin Equivalent Parallel Termination

Parallel termination in ECL applications uses -2.0 volts as the

terminating voltage. This represents a disadvantage since a

separate Vtt power supply must be available (Vee = -5.2 volts,

Vtt = -2.0 volts). For systems in which a separate -2.0 volt sup-

ply is not available, the use of a Thevenin equivalent arrange-

ment, although resulting in higher power consumption, provides

a convenient solution.

Bourns 803 and 805 conformal coated SIP resistor capacitor

networks are designed to terminate 8 transmission lines using

the Thevenin equivalent parallel termination technique. Again, a

0.1 µF capacitor is provided to help maintain a solid Vee level

within the package, mitigating any potential cross talk or

feedthrough effects. The 803 is designed for use with 10K ECL

whereas the 805 is designed for use with 100K ECL.

Bourns Emitter Coupled Logic Terminator 800 Series

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