el2166 Intersil Corporation, el2166 Datasheet - Page 12

• Manufacturer Part Number: el2166
• Description: 110mhz Current Feedback Amplifier With Disable
• Manufacturer: Intersil Corporation

disable signal applied to the /DISABLE pin is referenced to
the GND pin. The GND pin can be tied as low as the V
This allows the EL2166 to be operated on a single supply.
For example, one could tie the V
V
the /DISABLE pin. Remember to keep the inputs of the
EL2166 within their common mode range.
Multiplexing with the EL2166
An example of multiplexing with the EL2166 and its response
curve is shown below. Always be sure that no more than ±5V
is applied between V
standard video signals. This usually becomes an issue only
when using the disable feature and amplifying large
voltages.
In the multiplexer above, suppose one amp is disabled and
the other has amplified a signal to +10V at V
voltage at pin 2 of the disabled amplifier will now be +5V due
to the resistor divider action. Therefore, any applied voltage
at pin 3 of the disabled amplifier must remain above 0V if the
voltage between pins 2 and 3 of the disabled amplifier is to
remain less than 5V. Also keep in mind that each disabled
amplifier adds more capacitance to the bus, as discussed
above. See Disable Function, and Driving Cables and
Capacitive Loads in this section, and the Frequency
S
+ to +10V, and then use standard TTL or CMOS to drive
DUAL EL2166 MULTIPLEXER
IN
+ and V
12
IN
S
-, which is compatible with
- and GND pins to 0V and
OUT
. The
S
- pin.
EL2166
Response for Various C
Curve section.
Settling Characteristics
The EL2166 offers superb settling characteristics to 0.1%,
typically in the 35ns to 40ns range. There are no aberrations
created from the input stage which often cause longer
settling times in other current feedback amplifiers. The
EL2166 is not slew rate limited, therefore any size step up to
±10V gives approximately the same settling time.
As can be seen from the Long Term Settling Error curve, for
A
away to 0.01% in about 20µs. This is a thermal settling error
caused by a power dissipation differential (before and after
the voltage step). For A
configuration, this tail does not appear since the input stage
does not experience the large voltage change as in the non-
inverting mode. With A
greater than 100ns.
Power Dissipation
The EL2166 amplifier combines both high speed and large
output current drive capability at a moderate supply current
in very small packages. It is possible to exceed the maximum
junction temperature allowed under certain supply voltage,
temperature, and loading conditions. To ensure that the
EL2166 remains within its absolute maximum ratings, the
following discussion will help to avoid exceeding the
maximum junction temperature.
The maximum power dissipation allowed in a package is
determined by its thermal resistance and the amount of
temperature rise according to:
V
= +1, there is approximately a 0.02% residual which tails
P
EL2166 Multiplexer Switching
4Vpp Uncorrelated Sinewaves to
2Vpp Uncorrelated Sinewaves
DMAX
V
V
L
= -1, 0.01% settling time is slightly
= -1, due to the inverting mode
=
curves in the Typical Performance
T
-------------------------------------------- -
JMAX
T
–
JA
T
AMAX