1

®

FN7063

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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EL2257

125MHz Single Supply, Clamping Op Amp

The EL2257 is a single supply op amp.

Prior single supply op amps have

generally been limited to bandwidths

and slew rates one-fourth of that of the EL2257. The

125MHz bandwidth, 275V/µs slew rate and 0.05%/0.05°

differential gain/differential phase makes this part ideal for

single or dual supply video speed applications. With its

voltage feedback architecture, this amplifier can accept

reactive feedback networks, allowing them to be used in

analog filtering applications. The inputs can sense signals

below the bottom supply rail and as high as 1.2V below the

top rail. Connecting the load resistor to ground and operating

from a single supply, the outputs swing completely to ground

without saturating. The outputs can also drive to within 1.2V

of the top rail. The EL2257 will output ±100mA and will

operate with single supply voltages as low as 2.7V, making

them ideal for portable, low power applications.

The EL2257 has a high speed disable feature. Applying a

low logic level to all ENABLE pins reduces the supply current

to 0µA within 50ns. Each amplifier has its own ENABLE pin.

This is useful for both multiplexing and reducing power

consumption.

The EL2257 also has an output voltage clamp feature. This

clamp is a fast recovery (< 7ns) output clamp that prevents

the output voltage from going above the preset clamp

voltage. This feature is desirable for A/D applications, as A/D

converters can require long times to recover if overdriven.

The EL2257 is available in 14-pin SO (0.150") and 14-pin

PDIP packages and operates over the industrial temperature

range of -40°C to +85°C. For single amplifier applications,

see the EL2150 and EL2157. For space-saving, industry-

standard pinout dual and quad applications, see the EL2250

and EL2450.

Features

• Specified for +3V, +5V, or ± 5V applications

• Power-down to 0µA

• Output voltage clamp

• Output swings to ground without saturating

• -3dB bandwidth = 125MHz

• ±0.1dB bandwidth = 30MHz

• Low supply current = 5mA

• Slew rate = 275V/µs

• Low offset voltage = 4mV max

• Output current = ±100mA

• High open loop gain = 80dB

• Differential gain = 0.05%

• Differential phase = 0.05°

Applications

• Video amplifiers

• PCMCIA applications

•A/D drivers

• Line drivers

• Portable computers

• High speed communications

• RGB printer, fax, scanner applications

• Broadcast equipment

• Active filtering

• Multiplexing

Pinout

EL2257

[14-PIN SO (0.150”), PDIP]

TOP VIEW

Ordering Information

PART NUMBER

PACKAGE

TAPE &

REEL

PKG. NO.

EL2257CS

14-Pin SO (0.150")

-

MDP0027

EL2257CS-T7

14-Pin SO (0.150")

7”

MDP0027

EL2257CS-T13

14-Pin SO (0.150")

13”

MDP0027

EL2257CN

14-Pin PDIP

-

MDP0031

1

2

3

4

14

13

12

11

5

6

7

10

9

8

-

+

-

+

INA+

CLAMPA

ENABLEA

GND

ENABLEB

CLAMPB

INB+

INA-

OUTA

NC

VS+

NC

OUTB

INB-

Data Sheet

February 28, 2002