EL5220 Intersil Corporation, EL5220 Datasheet - Page 10

• Manufacturer Part Number: EL5220
• Description: op Amp, Dual 12MHz, Rail-to-rail I/O, 500uA Per Amp, SR = 10V/us
• Manufacturer: Intersil Corporation

Applications Information
Product Description
The EL5220 and EL5420 voltage feedback amplifiers are
fabricated using a high voltage CMOS process. They exhibit
rail-to-rail input and output capability, they are unity gain
stable, and have low power consumption (500µA per
amplifier). These features make the EL5220 and EL5420
ideal for a wide range of general-purpose applications.
Connected in voltage follower mode and driving a load of
10kΩ and 12pF, the EL5220 and EL5420 have a -3dB
bandwidth of 12MHz while maintaining a 10V/µs slew rate.
The EL5220 is a dual amplifier while the EL5420 is a quad
amplifier.
Operating Voltage, Input, and Output
The EL5220 and EL5420 are specified with a single nominal
supply voltage from 5V to 15V or a split supply with its total
range from 5V to 15V. Correct operation is guaranteed for a
supply range of 4.5V to 16.5V. Most EL5220 and EL5420
specifications are stable over both the full supply range and
operating temperatures of -40°C to +85°C. Parameter
variations with operating voltage and/or temperature are
shown in the typical performance curves.
The input common-mode voltage range of the EL5220 and
EL5420 extends 500mV beyond the supply rails. The output
swings of the EL5220 and EL5420 typically extend to within
80mV of positive and negative supply rails with load currents
of 5mA. Decreasing load currents will extend the output
voltage range even closer to the supply rails. Figure 1 shows
the input and output waveforms for the device in the unity-
gain configuration. Operation is from ±5V supply with a 10kΩ
load connected to GND. The input is a 10V
output voltage is approximately 9.985V
Short Circuit Current Limit
The EL5220 and EL5420 will limit the short circuit current to
±120mA if the output is directly shorted to the positive or the
negative supply. If an output is shorted indefinitely, the power
dissipation could easily increase such that the device may be
damaged. Maximum reliability is maintained if the output
FIGURE 1. OPERATION WITH RAIL-TO-RAIL
INPUT AND OUTPUT
10
V
T
A
V
A
S
V
IN
=±5V
=25°C
=1
=10V
P-P
.
P-P
P-P
sinusoid. The
EL5220, EL5420
continuous current never exceeds ±30mA. This limit is set by
the design of the internal metal interconnects.
Output Phase Reversal
The EL5220 and EL5420 are immune to phase reversal as
long as the input voltage is limited from (V
+0.5V. Figure 2 shows a photo of the output of the device
with the input voltage driven beyond the supply rails.
Although the device's output will not change phase, the
input's overvoltage should be avoided. If an input voltage
exceeds supply voltage by more than 0.6V, electrostatic
protection diodes placed in the input stage of the device
begin to conduct and overvoltage damage could occur.
Power Dissipation
With the high-output drive capability of the EL5220 and
EL5420 amplifiers, it is possible to exceed the 125°C
“absolute-maximum junction temperature” under certain load
current conditions. Therefore, it is important to calculate the
maximum junction temperature for the application to
determine if load conditions need to be modified for the
amplifier to remain in the safe operating area.
The maximum power dissipation allowed in a package is
determined according to:
where:
The maximum power dissipation actually produced by an IC
is the total quiescent supply current times the total power
supply voltage, plus the power in the IC due to the loads, or:
T
T
θ
P
FIGURE 2. OPERATION WITH BEYOND-THE-RAILS INPUT
AMAX
JA
P
JMAX
DMAX
DMAX
= Thermal Resistance of the Package
= Maximum Ambient Temperature
= Maximum Junction Temperature
= Maximum Power Dissipation in the Package
=
1V
1V
Σi
×
[
P
V
DMAX
S
×
I
SMAX
=
T
----------------------------------------- -
JMAX
+
( (
V
Θ
S
100µs
-T
JA
+
AMAX
)-V
OUT
V
T
A
V
S
A
S
IN
-) -0.5V to (V
V
= ±2.5V
= 25°C
i )
= 1
= 6V
×
P-P
I
LOAD
i
]
S
+)