EL2111CW [INTERSIL]

Low Cost, Gain of 2, Video Op Amp; 低成本，增益为2 ，视频运算放大器


型号：	EL2111CW
厂家：	Intersil
描述：	Low Cost, Gain of 2, Video Op Amp 低成本，增益为2 ，视频运算放大器运算放大器光电二极管局域网
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EL2111

Data Sheet

November 14, 2002

FN7043

Low Cost, Gain of 2, Video Op Amp

Features

The EL2111 operational amplifier, built

using Elantec’s complementary bipolar

process, offers unprecedented high

• Optimized for 5V operation

• Stable at gain of 2

• 100MHz gain bandwidth product

• 130V/µs slew rate

frequency performance at a very low cost. It is suitable for

any application, such as consumer video, where traditional

DC performance specifications are of secondary importance

to the high frequency specifications. On a 5V supply at a

gain of +2 the EL2111 will drive a 150Ω load to +2V, with a

bandwidth of 100MHz. This device achieves 0.1dB

bandwidth at 5MHz.

• Drives 150Ω load to video levels

• Input and outputs operate at negative supply rail

Applications

The recommended power supply voltage is 5V. At zero and

5V supplies, the inputs will operate to ground. When the

outputs are at 0V the amplifier draws only 2.4mA of supply

current.

• Consumer video amplifier

• Active filters/integrators

• Cost sensitive applications

• Single supply amplifiers

Ordering Information

PART

NUMBER

EL2111CN

EL2111CS

EL2111CW

PACKAGE

8-Pin PDIP

8-Pin SO

TAPE & REEL

PKG. NO.

MDP0031

MDP0027

MDP0038

5-Pin SOT-23*

*EL2111CW symbol is .Exxx where xxx represents date code

Pinouts

EL2111

(5-PIN SOT23)

TOP VIEW

EL2111

(8-PIN PDIP, SO)

TOP VIEW

IN-

OUT

GND

IN+

VS+

IN-

VS+

OUT

IN+

GND

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

1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.

All other trademarks mentioned are the property of their respective owners.

EL2111

Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Curves

Storage Temperature Range . . . . . . . . . . . . . . . . . .-65°C to +150°C

Operating Temperature Range . . . . . . . . . . . . . . . . -40°C to +85°C

Absolute Maximum Ratings (T = 25°C)

Total Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18V

Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -6V

Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6V

Peak Output Current . . . . . . . . . . . . . . . . . . . . . .75mA per amplifier

CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the

device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typical values are for information purposes only. Unless otherwise noted, all tests

are at the specified temperature and are pulsed tests, therefore: T = T = T

DC Electrical Specifications

= +5V, R = 1kΩ, V = 1V, T = 25°C unless otherwise specified.

PARAMETER

DESCRIPTION

Input Offset Voltage

CONDITIONS

MIN

TYP

MAX

UNIT

µV/°C

µA

-20

TCV

Average Offset Voltage Drift

Input Bias Current

(Note 1)

-50

-7

-15

-1

-3

Input Offset Current

0.3

-3

1.0

µA

TCI

Average Offset Current Drift

Open Loop Gain

(Note 1)

nA/°C

V/V

= 0.5, 2.5, R = 1kΩ

160

250

VOL

OUT

= 0.5, 2.5, R = 150kΩ

PSRR

CMRR

CMIR

Power Supply Rejection Ratio

Common Mode Rejection Ratio

Common Mode Input Range

Output Voltage Swing

= 4.5V to 5.5V

= 0V to 3.8V

0.0

2.8

3.0

= R = 1kΩ, R = 150Ω

3.2

125

2.4

OUT

Output Short Circuit Current

Supply Current

Output to Ground (Note 2)

kΩ

No load (per channel) V = 0V

2.0

Input Resistance

Differential

150

1.5

Common mode

MΩ

Input Capacitance

= 1 @ 10MHz

Output Resistance

0.150

Ω

OUT

PSOR

Power Supply Operating Range

Single supply

NOTES:

1. Measured from T

MIN

to T

MAX

2. A heat-sink is required to keep junction temperature below absolute maximum when an output is shorted.

Closed-Loop AC Electrical Specifications

V = 5V, AC Test Figure, T = 25°C unless otherwise specified.

S A

PARAMETER

DESCRIPTION

-3dB Bandwidth (V = 0.4mV

CONDITIONS

MIN

TYP

100

MAX

UNIT

MHz

)

= 1

OUT

±0.1dB Bandwidth (V

P-P

= 0.4mV

)

P-P

OUT

GBWP

Gain Bandwidth Product

Phase Margin

Slew Rate

130

V/µs

MHz

FBWP

Full Power Bandwidth

Rise Time, Fall Time

Overshoot

(Note 1)

t , t

0.1V step

EL2111

Closed-Loop AC Electrical Specifications

= 5V, AC Test Figure, T = 25°C unless otherwise specified. (Continued)

PARAMETER

DESCRIPTION

Propagation Delay

CONDITIONS

MIN

TYP

3.5

MAX

UNIT

Settling to 0.1% (A = 1)

= 5V, 2V step

Differential Gain (Note 2)

Differential Phase (Note 2)

Input Noise Voltage

NTSC/PAL

10kHz

0.1

0.2

nV/√Hz

Input Noise Current

10kHz

1.5

Channel Separation

P = 5MHz

NOTES:

1. For V = 5V, V

OUT

= 4V . Full power bandwidth is based on slew rate measurement using: FPBW = SR/(2pi*V

P-P

)

PEAK

2. Video performance measured at V = 5V, A = 2 with 2 times normal video level across R = 150Ω

EL2111

Typical Performance Curves

8-Pin Plastic DIP

8-Pin SO

5-Pin SOT23

Maximum Power Dissipation

vs Ambient Temperature

Maximum Power Dissipation

vs Ambient Temperature

Maximum Power Dissipation

vs Ambient Temperature

± supplies. All electrical characteristics are measured with a

5V supply.

Simplified Block Diagram

Output Swing vs Load

Please refer to the simplified block diagram. This amplifier

provides an NPN pull-up transistor output and a passive

1250Ω pull-down resistor to the most negative supply. In a

application where the load is connected to V - the output

voltage can swing to within 200mV of V -.

Output Drive Capability

This device does not have short circuit protection. Each

output is capable of than 100mA into a shorted output. Care

must be used in the design to limit the output current with a

series resistor.

Single 5V Supply Video Cable Driver

These amplifiers may be used as a direct coupled video

cable driver with a gain of 2. With a 75Ω back matching

resistor driving a terminated 75Ω cable the output at the

cable load will be original video level (1V NTSC). The best

operating mode is with direct coupling. The input signal must

be offset to keep the entire signal within the range of the

amplifier. The required offset voltage can be set with a

resistor divider and a bypass capacitor in the video path

(Figure 1). The input DC offset should be between 0.3V and

Applications Information

Product Description

The EL2111 operational amplifier is stable at a gain of 1. It is

built on Elantec’s proprietary complimentary bipolar process.

This topology allows it to be used in a variety of applications

where current mode amplifiers are not appropriate because

of restrictions placed on the feedback elements. This product

is especially designed for applications where high bandwidth

and good video performance characteristics are desired but

the higher cost of more flexible and sophisticated products

are prohibitive.

0.5V. With R = 68k and R = 4.7k the input offset will be

0.32V. Since these amplifiers require a DC load at their

outputs it is good design practice to add a 250Ω resistor to

ground directly at the amplifier output. Then if the 75Ω cable

termination resistor were inadvertently removed there would

still be an output signal. The values in Figure 1 give an

output range of 0V to 2.6V.

Power Supplies

The EL2111 is designed to work at a supply voltage

difference of 4.5V to 5.5V. It will work on any combination of

Output capacitive coupling also has some restrictions. These

amplifiers require a DC load at their outputs. A 75Ω back

EL2111

matching resistor to a cable and a 75Ω load to ground at the

end of the cable provide a 150Ω DC load. But output

capacitive coupling opens this DC path so an extra pulldown

resistor on the amplifier output to ground is required.

Figure 4 shows a 250Ω resistor. Capacitively coupling the

output will require that we shift the output offset voltage

(Figure 2) and with a white picture level is about 583mV

(Figure 3). This gives a maximum change in average value

of about 555mV. A direct coupled amplifier with an standard

NTSC video signal needs a dynamic range of 1.143V. But

with input capacitance coupling the dynamic range

requirements are the sum of the 1.143V video plus the

higher than in the direct coupled case. Using R = 43k and

average picture value change of 0.555V or 1.698V . At a

P-P

R = 4.7k will make the quiescent output offset voltage

about 1V. The output dynamic range will be 0.6V to 3V.

gain of two this doubles to 3.394V. These amplifiers do not

have this much dynamic range so a gain of less than 2 must

be used to avoid waveform compression under all

conditions.

Input capacitive coupling will increase the needed dynamic

range of the amplifier. The standard NTSC video signal is 1V

peak to peak plus 143mV for the color AC peak. The video

signal is made up of the -286mV sync pulse plus the 714mV

picture signal which may very from 0V to 714mV. The video

signal average value for a black picture is about 28mV

Capacitively coupling the input and output is worse than a

capacitor only on the input. Without any special

compromises you can only take a gain of one. But if the

backmatch resistor is reduced to 36Ω, reducing the output

0.1µF

0.32VB 68K

4.7K

OUT

0.64VB

V AMP

AMP

Video

–

FIGURE 1.

Gain = 2

1.8V offset

Amp

Ý10µs

OutVolts

53µs

1.428

1.166

2.062

1.8

0.714V

0.6

0.583V

0.867

0.0V

+0.348

+0.062

-0.286V

-0.572

1.3µs

3.8µs

5.1µs

FIGURE 2. WHITE LEVEL VIDEO

Gain = 2

+56mV

1.8V offset

Amp Out

Volts

0.714V

+3.172

Average BL

+45mV

53mV

0.686V +28mV

0.0V

+1.8

-0.286V

+1.172

Average Picture Value Change — 555mV

FIGURE 3. BLACK LEVEL VIDEO

EL2111

range requirement 25% and the output offset is shifted to

2.1V you can take a gain of 1.5 and have a standard NTSC

1V at the 75Ω load.

Printed Circuit Layout

The EL2111 is well behaved, and easy to apply in most

applications. However, a few simple techniques will help

assure rapid, high quality results. As with any high frequency

device, good PCB layout is necessary for optimum

A simple transistor, capacitor and resistor sync tip clamp

may be used when the input is already AC coupled to set the

sync tip to ground. This gives the input a fixed DC level and

can be used like a direct coupled input. The clamp uses a

PNP transistor with the collector at ground and the base has

a 200kΩ resistor to 5V. The emitter connects to the amplifier

input and a capacitor from the video input. The clamp

functions as an inverted Beta current source for input bias

current with plus inputs and a clamp to ground for minus

performance. Ground-plane construction is highly

recommended, as is good power supply bypassing. A 0.1µF

ceramic capacitor is recommended for bypassing both

supplies. Pin lengths should be as short as possible, and

bypass capacitors should be as close to the device pins as

possible. For good AC performance, parasitic capacitances

should be kept to a minimum at both inputs and at the

output. Resistor values should be kept under 5kΩ because

of the RC time constants associated with the parasitic

capacitance. Metal-film and carbon resistors are both

acceptable, use of wire-wound resistors is not recommended

because of their parasitic inductance. Similarly, capacitors

should be low-inductance for best performance.

inputs. The R and R resistors are removed for the clamp

option (Figure 4).

2N3904

200K

Clamp

Option

PNP

12K

1.4VB

47µF

OUT

2.1VB

V AMP

AMP

–

Video

–

FIGURE 4.

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Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality

Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without

notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and

reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result

from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.

For information regarding Intersil Corporation and its products, see www.intersil.com

EL2111CW [INTERSIL]

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