el5411t Intersil Corporation, el5411t Datasheet - Page 12

• Manufacturer Part Number: el5411t
• Description: 60mhz Rail-to-rail Input-output Operational Amplifier
• Manufacturer: Intersil Corporation

Applications Information
Product Description
The EL5411T is a high voltage rail-to-rail input-output
amplifier with low power consumption. The EL5411T
contains four amplifiers. Each amplifier exhibits beyond the
rail input capability, rail-to-rail output capability and is unity
gain stable.
The EL5411T features a high slew rate of 100V/µs, and fast
settling time. Also, the device provides common mode input
capability beyond the supply rails, rail-to-rail output
capability, and a bandwidth of 60MHz (-3dB). This enables
the amplifiers to offer maximum dynamic range at any supply
voltage.
Operating Voltage, Input and Output Capability
The EL5411T can operate on a single supply or dual supply
configuration. The EL5411T operating voltage ranges from a
minimum of 4.5V to a maximum of 19V. This range allows for
a standard 5V (or ±2.5V) supply voltage to dip to -10%, or a
standard 18V (or ±9V) to rise by +5.5% without affecting
performance or reliability.
The input common-mode voltage range of the EL5411T
extends 500mV beyond the supply rails. Also, the EL5411T
is immune to phase reversal. However, if the common mode
input voltage exceeds the supply voltage by more than 0.5V,
electrostatic protection diodes in the input stage of the
device begin to conduct. Even though phase reversal will not
occur, to maintain optimal reliability it is suggested to avoid
input overvoltage conditions. Figure 30 shows the input
voltage driven 500mV beyond the supply rails and the device
output swinging between the supply rails.
The EL5411T output typically swings to within 50mV 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 31
shows the input and output waveforms for the device in a
unity-gain configuration. Operation is from ±5V supply with a
1kΩ load connected to GND. The input is a 10V
and the output voltage is approximately 9.9V
Refer to the “Electrical Specifications” Table beginning on
page 3 for specific device parameters. Parameter variations
with operating voltage, loading and/or temperature are
shown in the “Typical Performance Curves” on page 6.
12
P-P
P-P
.
sinusoid
EL5411T
Output Current
The EL5411T is capable of output short circuit currents of
300mA (source and sink), and the device has built-in
protection circuitry which limits the short circuit current to
±300mA (typical).
To maintain maximum reliability, the continuous output
current should never exceed ±70mA. This ±70mA limit is
determined by the characteristics of the internal metal
interconnects. Also, see “Power Dissipation” on page 13 for
detailed information on ensuring proper device operation
and reliability for temperature and load conditions.
Unused Amplifiers
It is recommended that any unused amplifiers be configured
as a unity gain follower. The inverting input should be directly
connected to the output and the non-inverting input tied to
the ground.
Driving Capacitive Loads
As load capacitance increases, the -3dB bandwidth will
decrease and peaking can occur. Depending on the
application, it may be necessary to reduce peaking and to
improve device stability. To improve device stability a
snubber circuit or a series resistor may be added to the
output of the EL5411T.
FIGURE 30. OPERATION WITH BEYOND-THE-RAILS INPUT
FIGURE 31. OPERATION WITH RAIL-TO-RAIL INPUT AND
V
V
S
S
= ±2.5V, T
= ±5V, T
OUTPUT
A
A
= +25°C, A
INPUT
= +25°C, A
V
V
10
10
= 1, V
OUTPUT
= 1, V
µs/DIV
µs/DIV
INx
INx
= 10V
= 6V
P-P,
P-P,
R
R
L
L
= 1kΩ to GND
= 1kΩ to GND
October 8, 2009
FN6837.1