EL5250 datasheet(11/18 Pages) RENESAS

11 / 18 page

EL5150, EL5151, EL5250, EL5251, EL5451

FN7384 Rev 7.00

Page 11 of 18

January 16, 2008

Product Description

The EL5150, EL5151, EL5250, EL5251 and EL5451 are

wide bandwidth, low power, low offset voltage feedback

operational amplifiers capable of operating from a single or

dual power supplies. This family of operational amplifiers are

internally compensated for closed loop gain of +1 or greater.

Connected in voltage follower mode, driving a 500

 load

members of this amplifier family demonstrate a -3dB

bandwidth of about 200MHz. With the loading set to

accommodate typical video application, 150

 load and gain

set to +2, bandwidth reduces to about 40MHz with a 67V/µs

slew rate. Power down pins on the EL5151 and EL5251

reduce the already low power demands of this amplifier

family to 12µA typical while the amplifier is disabled.

Input, Output and Supply Voltage Range

The EL5150 and family members have been designed to

operate with supply voltage ranging from 5V to 12V. Supply

voltages range from ±2.5V to ±5V for split supply operation.

And of course split supply operation can easily be achieved

using single supplies with by splitting off half of the single

supply with a simple voltage divider as illustrated in the

application circuit section.

Input Common Mode Range

These amplifiers have an input common mode voltage

ranging from 3.5V above the negative supply (VS- pin) to

3.5V below the positive supply (VS+ pin). If the input signal is

driven beyond this range the output signal will exhibit

distortion.

Maximum Output Swing & Load Resistance

The outputs of the EL5150 and family members exhibit

maximum output swing ranges from -4V to 4V for VS = ±5V

with a load resistance of 500

. Naturally, as the load

resistance becomes lower, the output swing lowers

accordingly; for instance, if the load resistor is 150

, the

output swing ranges from -3.5V to 3.5V. This response is a

simple application of Ohms law indicating a lower value

resistance results in greater current demands of the

amplifier. Additionally, the load resistance affects the

frequency response of this family as well as all operational

amplifiers; as clearly indicated by the Gain vs Frequency For

Various RL curves clearly indicate. In the case of the

frequency response reduced bandwidth with decreasing

load resistance is a function of load resistance in conjunction

with the output zero response of the amplifier.

Choosing A Feedback Resistor

A feedback resistor is required to achieve unity gain; simply

short the output pin to the inverting input pin. Gains greater

than +1 require a feedback and gain resistor to set the

desired gain. This gets interesting because the feedback

resistor forms a pole with the parasitic capacitance at the

inverting input; as the feedback resistance increases the

position of the pole shifts in the frequency domain, the

amplifier's phase margin is reduced and the amplifier

becomes less stable. Peaking in the frequency domain and

ringing in the time domain are symptomatic of this shift in

pole location. So we want to keep the feedback resistor as

small as possible. You may want to use a large feedback

resistor for some reason; in this case to compensate the shift

of the pole and maintain stability a small capacitor in the few

Pico farad range in parallel with the feedback resistor is

recommended.

For the gains greater than unity it has been determined a

feedback resistance ranging from 500

 to 750 provides

optimal response.

FIGURE 39. PACKAGE POWER DISSIPATION vs AMBIENT

TEMPERATURE

FIGURE 40. PACKAGE POWER DISSIPATION vs AMBIENT

TEMPERATURE

Typical Performance Curves (Continued)

JEDEC JESD51-7 HIGH EFFECTIVE THERMAL

CONDUCTIVITY TEST BOARD

1.136W

909mW

870mW

435mW

150

1.4

1.2

0.4

AMBIENT TEMPERATURE (°C)

0.2

125

0.8

100

75 85

1.0

0.6

JA = 88°C/W

SO14

JA = 230°C/W

SOT23-5/6

JA = 110°C/W

SO8

JA = 115°C/W

MSOP8/10

JEDEC JESD51-3 LOW EFFECTIVE THERMAL

CONDUCTIVITY TEST BOARD

150

0.9

0.2

AMBIENT TEMPERATURE (°C)

0.1

125

0.5

100

75 85

0.7

0.3

0.8

0.4

0.6

833mW

625mW

486mW

391mW

JA = 265°C/W

SOT23-5/6

JA = 206°C/W

MSOP8/10

JA = 120°C/W

SO14

JA = 160°C/W

SO8

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