EL2045CS datasheet(9/12 Pages) ELANTEC

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EL2045C

Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier

Burn-In Circuit

2045 – 10

All Packages Use the Same Schematic

Applications Information

Product Description

The EL2045C is a low-power wideband gain-of-2

stable monolithic operational amplifier built on

Elantec’s proprietary high-speed complementary

bipolar process The EL2045C 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 topolo-

gy of the EL2045C allows for example a capaci-

tor to be placed in the feedback path making it

an excellent choice for applications such as active

filters sample-and-holds or integrators Similar-

ly because of the ability to use diodes in the feed-

back network the EL2045C is an excellent choice

for applications such as fast log amplifiers

Single-Supply Operation

The EL2045C has been designed to have a wide

input and output voltage range This design also

makes the EL2045C an excellent choice for sin-

gle-supply operation Using a single positive sup-

ply

the lower input voltage range is within

100 mV of ground (RL e 500X) and the lower

output voltage range is within 300 mV of ground

Upper input voltage range reaches 42V and out-

put voltage range reaches 38V with a 5V supply

and RL e 500X This results in a 35V output

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

25V On a single 25V supply the EL2045C still

has 1V of output swing

Gain-Bandwidth Product and the b3dB

Bandwidth

The EL2045C has a gain-bandwidth product of

100 MHz while using only 52 mA of supply cur-

rent For gains greater than 4 its closed-loop

3 dB 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 band-

widths For example the EL2045C has a b3dB

bandwidth of 100 MHz at a gain of a2 dropping

to 20 MHz at a gain of a5 It is important to

note that the EL2045C has been designed so that

this ‘‘extra’’ bandwidth in low-gain applications

does not come at the expense of stability As seen

in the typical performance curves the EL2045C

in a gain of a2 only exhibits 10 dB of peaking

with a 1000

X load

Video Performance

An industry-standard method of measuring the

video distortion of a component such as the

EL2045C is to measure the amount of differential

gain (dG) and differential phase (dP) that it in-

troduces

make

these

measurements

0286 VPP (40 IRE) signal is applied to the device

with 0V DC offset (0 IRE) at either 358 MHz for

NTSC or 443 MHz for PAL A second measure-

ment is then made at 0714V DC offset (100

IRE)

Differential gain is a measure of the

change in amplitude of the sine wave and is mea-

sured in percent Differential phase is a measure

of the change in phase and is measured in de-

grees

For signal transmission and distribution a back-

terminated cable (75

X in series at the drive end

and 75

X to ground at the receiving end) is pre-

ferred since the impedance match at both ends

will absorb any reflections However when dou-

ble termination is used the received signal is

halved therefore a gain of 2 configuration is typi-

cally used to compensate for the attenuation

The EL2045C has been designed as an economi-

cal solution for applications requiring low video

distortion It has been thoroughly characterized

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