当前位置：文档库 › EL2111CS中文资料

EL2111CS中文资料

FN7043

EL2111

Low Cost, Gain of 2, Video Op Amp

The EL2111 operational amplifier, built

using Elantec’s complementary bipolar

process, offers unprecedented high

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 150? load to +2V, with a

bandwidth of 100MHz. This device achieves 0.1dB

bandwidth at 5MHz.

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.

Features

?Optimized for 5V operation

?Stable at gain of 2

?100MHz gain bandwidth product

?130V/μs slew rate

?Drives 150? load to video levels

?Input and outputs operate at negative supply rail

Applications

?Consumer video amplifier

?Active filters/integrators

?Cost sensitive applications

?Single supply amplifiers

*EL2111CW symbol is .Exxx where xxx represents date code

Ordering Information

PART

NUMBER PACKAGE TAPE & REEL PKG. NO.

EL2111CN8-Pin PDIP-MDP0031

EL2111CS8-Pin SO-MDP0027

EL2111CW5-Pin SOT-23*-MDP0038

Pinouts

EL2111

(5-PIN SOT23)

TOP VIEW

EL2111

(8-PIN PDIP, SO)

TOP VIEW

OUT

GND

IN+

VS+

IN-

IN+

GND

VS+

OUT

Data Sheet November 14, 2002

O B S

O L E

T E P

R O D

U C T

N O R

E C O

M M E

N D E

D R E

P L A C

E M E

N T

c o n t

a c t o

u r T e

c h n i

c a l S

u p p o

r t C e

n t e r

a t

1-88

8-I N T

E R S

I L o r

w w w

.i n t e

r s i l.c

o m/t

s c

元器件交易网https://www.wendangku.net/doc/2018234216.html,

Absolute Maximum Ratings (T A = 25°C)

T otal Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18V Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-6V S Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6V Peak Output Current . . . . . . . . . . . . . . . . . . . . . .75mA per amplifier Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Curves Storage Temperature Range. . . . . . . . . . . . . . . . . .-65°C to +150°C Operating T emperature Range . . . . . . . . . . . . . . . . -40°C to +85°C

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 J = T C = T A

DC Electrical Specifications V S = +5V, R L = 1k?, V IN = 1V, T A = 25°C unless otherwise specified.

PARAMETER DESCRIPTION CONDITIONS MIN TYP MAX UNIT

V OS Input Offset Voltage-201020mV TCV OS Average Offset Voltage Drift(Note 1)-50μV/°C

I B Input Bias Current-15-7-3μA

I OS Input Offset Current-10.3 1.0μA TCI OS Average Offset Current Drift(Note 1)-3nA/°C

A VOL Open Loop Gain V OUT = 0.5, 2.5, R L = 1k?160250V/V

V OUT = 0.5, 2.5, R L = 150k?160250V/V PSRR Power Supply Rejection Ratio V S = 4.5V to 5.5V4350dB CMRR Common Mode Rejection Ratio V CM = 0V to 3.8V5565dB CMIR Common Mode Input Range0.0 3.0V

V OUT Output Voltage Swing R FB = R G = 1k?, R L = 150? 2.8 3.2V

I SC Output Short Circuit Current Output to Ground (Note 2)75125mA

I S Supply Current No load (per channel) V IN = 0V 2.0 2.4 3.0mA

R IN Input Resistance Differential150k?

Common mode 1.5M?

C IN Input Capacitance A V = 1 @ 10MHz1pF

R OUT Output Resistance0.150?PSOR Power Supply Operating Range Single supply46V 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 S = 5V, AC T est Figure, T A = 25°C unless otherwise specified.

PARAMETER DESCRIPTION CONDITIONS MIN TYP MAX UNIT BW-3dB Bandwidth (V OUT = 0.4mV P-P)A V = 1100MHz ±0.1dB Bandwidth (V OUT = 0.4mV P-P)A V = 110MHz GBWP Gain Bandwidth Product50MHz PM Phase Margin55 °

SR Slew Rate85130V/μs FBWP Full Power Bandwidth(Note 1)811MHz

t R, t F Rise Time, Fall Time0.1V step2ns

OS Overshoot0.1V step15%

Closed-Loop AC Electrical Specifications V S = 5V, AC T est Figure, T A = 25°C unless otherwise specified. (Continued) PARAMETER DESCRIPTION CONDITIONS MIN TYP MAX UNIT t PD Propagation Delay 3.5ns

t S Settling to 0.1% (A V = 1)V S = 5V, 2V step80ns dG Differential Gain (Note 2)NTSC/PAL0.1% dP Differential Phase (Note 2)NTSC/PAL0.2°

e N Input Noise Voltage10kHz15nV/√Hz i N Input Noise Current10kHz 1.5nV/√Hz CS Channel Separation P = 5MHz55dB

NOTES:

1.For V S = 5V, V OUT = 4V P-P. Full power bandwidth is based on slew rate measurement using: FPBW = SR/(2pi*V PEAK)

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

Typical Performance Curves

Simplified Block Diagram

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.

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

± supplies. All electrical characteristics are measured with a 5V supply.

Output Swing vs Load

Please refer to the simplified block diagram. This amplifier provides an NPN pull-up transistor output and a passive 1250? pull-down resistor to the most negative supply. In a application where the load is connected to V S - the output voltage can swing to within 200mV of V S -.

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 75? back matching resistor driving a terminated 75? 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 0.5V . With R A =68k and R B =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 250? resistor to ground directly at the amplifier output. Then if the 75? 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 .

Output capacitive coupling also has some restrictions. These amplifiers require a DC load at their outputs. A 75?

back

8-Pin Plastic DIP

Maximum Power Dissipation vs Ambient Temperature 8-Pin SO

Maximum Power Dissipation vs Ambient Temperature 5-Pin SOT23

Maximum Power Dissipation

vs Ambient Temperature

matching resistor to a cable and a 75? load to ground at the end of the cable provide a 150? 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 250? resistor. Capacitively coupling the output will require that we shift the output offset voltage higher than in the direct coupled case. Using R A =43k and R B =4.7k will make the quiescent output offset voltage about 1V . The output dynamic range will be 0.6V to 3V .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

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

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 36?, reducing the output

+–

Video 1V

R I S

V IN

R I L

4.7K

-AMP

1K RF

R G 0.1μF CB

68K

0.32VB +–

V15V

0.64VB

250

R P D

V AMP

V OUT

R C

L 75RO

FIGURE 1.

FIGURE 2.WHITE LEVEL VIDEO

FIGURE 3.BLACK LEVEL VIDEO

All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.

Intersil Corporation’s quality certifications can be viewed at https://www.wendangku.net/doc/2018234216.html,/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 https://www.wendangku.net/doc/2018234216.html,

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 75? load.

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 200k ? 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 inputs. The R A and R

B resistors are removed for the clamp option (Figure 4).

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 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 5k ? 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.

+–Video 1V

R I S V IN

R I L

200K 75

AMP

R G 47μF

12K

R A

+–

5V 2.1VB 250

R P D

V AMP

V OUT

R C L

36RO

1V FIGURE 4.

PNP

1.4VB

0.1μF

R B

C B

4.7K

47μF CO

Clamp Option

2N3904