10

FN7387.8

September 8, 2005

Driving Cables and Capacitive Loads

When used as a cable driver, double termination is always

recommended for reflection-free performance. For those

applications, the back-termination series resistor will

decouple the EL5160, EL5161, EL5260, EL5261, and

EL5360 from the cable and allow extensive capacitive drive.

However, other applications may have high capacitive loads

without a back-termination resistor. In these applications, a

small series resistor (usually between 5

Ω and 50Ω) can be

placed in series with the output to eliminate most peaking.

any gain loss which may be created by this additional

resistor at the output. In many cases it is also possible to

reduce the peaking.

Current Limiting

The EL5160, EL5161, EL5260, EL5261, and EL5360 have

no internal current-limiting circuitry. If the output is shorted, it

is possible to exceed the Absolute Maximum Rating for

output current or power dissipation, potentially resulting in

the destruction of the device.

Power Dissipation

With the high output drive capability of the EL5160, EL5161,

EL5260, EL5261, and EL5360, it is possible to exceed the

125°C Absolute Maximum junction temperature under

certain very high load current conditions. Generally speaking

application to determine if power supply voltages, load

conditions, or package type need to be modified for the

EL5160, EL5161, EL5260, EL5261, and EL5360 to remain in

the safe operating area. These parameters are calculated as

follows:

where:

•

• n = Number of amplifiers in the package

the package

where:

Typical Application Circuits

FIGURE 22. FAST-SETTLING PRECISION AMPLIFIER

×

×

()

+

=

2

(

(

----------------------------

×

–

+

×

×

=

IN+

IN-

OUT

IN+

IN-

OUT

0.1µF

+5V

0.1µF

-5V

500

Ω

5

Ω

5

Ω

500

Ω

500

Ω

0.1µF

0.1µF

+5V

-5V

FIGURE 21. INVERTING 200mA OUTPUT CURRENT

DISTRIBUTION AMPLIFIER

IN+

IN-

OUT

IN+

IN-

OUT

0.1µF

+5V

0.1µF

-5V

0.1µF

0.1µF

500

Ω

500

Ω

500

Ω

500

Ω

+5V

-5V

EL5160, EL5161, EL5260, EL5261, EL5360