el2045 Intersil Corporation, el2045 Datasheet - Page 7

• Manufacturer Part Number: el2045
• Description: Low-power 100mhz Gain-of-2 Stable Operational Amplifier
• Manufacturer: Intersil Corporation

Simplified Schematic
Burn-In Circuit
Applications Information
Product Description
The EL2045 is a low-power wideband, gain-of-2 stable
monolithic operational amplifier built on Elantec's proprietary
high-speed complementary bipolar process. The EL2045
uses a classical voltage-feedback topology which allows it to
be used in a variety of applications where current-feedback
amplifiers are not appropriate because of restrictions placed
upon the feedback element used with the amplifier. The
conventional topology of the EL2045 allows, for example, a
capacitor to be placed in the feedback path, making it an
excellent choice for applications such as active filters,
sample-and-holds, or integrators. Similarly, because of the
ALL PACKAGES USE THE SAME SCHEMATIC
7
EL2045
ability to use diodes in the feedback network, the EL2045 is
an excellent choice for applications such as fast log
amplifiers.
Single-Supply Operation
The EL2045 has been designed to have a wide input and
output voltage range. This design also makes the EL2045 an
excellent choice for single-supply operation. Using a single
positive supply, the lower input voltage range is within
100mV of ground (R
range is within 300mV of ground. Upper input voltage range
reaches 4.2V, and output voltage range reaches 3.8V with a
5V supply and R
swing on a single 5V supply. This wide output voltage range
also allows single-supply operation with a supply voltage as
high as 36V or as low as 2.5V. On a single 2.5V supply, the
EL2045 still has 1V of output swing.
Gain-Bandwidth Product and the -3dB Bandwidth
The EL2045 has a gain-bandwidth product of 100MHz while
using only 5.2mA of supply current. For gains greater than 4,
its closed-loop -3dB bandwidth is approximately equal to the
gain-bandwidth product divided by the noise gain of the
circuit. For gains less than 4, higher-order poles in the
amplifier's transfer function contribute to even higher closed
loop bandwidths. For example, the EL2045 has a -3dB
bandwidth of 100MHz at a gain of +2, dropping to 20MHz at
a gain of +5. It is important to note that the EL2045 has been
L
= 500Ω. This results in a 3.5V output
L
= 500Ω), and the lower output voltage
February 11, 2005
FN7030.1