10

EL5220C, EL5420C

12MHz Rail-to-Rail Input-Output Op Amps

Applications Information

Product Description

The EL5220C and EL5420C voltage feedback amplifi-

ers are fabricated using a high voltage CMOS process.

They exhibit rail-to-rail input and output capability, they

are unity gain stable, and have low power consumption

(500µA per amplifier). These features make the

EL5220C and EL5420C ideal for a wide range of gen-

eral-purpose applications. Connected in voltage follower

mode and driving a load of 10k

Ω and 12pF, the

EL5220C and EL5420C have a -3dB bandwidth of

12MHz while maintaining a 10V/µs slew rate. The

EL5220C is a dual amplifier while the EL5420C is a

quad amplifier.

Operating Voltage, Input, and Output

The EL5220C and EL5420C are specified with a single

nominal supply voltage from 5V to 15V or a split supply

with its total range from 5V to 15V. Correct operation is

guaranteed for a supply range of 4.5V to 16.5V. Most

EL5220C and EL5420C specifications are stable over

both the full supply range and operating temperatures of

-40 °C to +85 °C. Parameter variations with operating

voltage and/or temperature are shown in the typical per-

formance curves.

The input common-mode voltage range of the EL5220C

and EL5420C extends 500mV beyond the supply rails.

The output swings of the EL5220C and EL5420C typi-

cally extend to within 80mV of positive and negative

supply rails with load currents of 5mA. Decreasing load

currents will extend the output voltage range even closer

to the supply rails. Figure 1 shows the input and output

waveforms for the device in the unity-gain configura-

tion. Operation is from ±5V supply with a 10k

Ω load

Figure 1. Operation with Rail-to-Rail Input and

Output

Short Circuit Current Limit

The EL5220C and EL5420C will limit the short circuit

current to ±120mA if the output is directly shorted to the

positive or the negative supply. If an output is shorted

indefinitely, the power dissipation could easily increase

such that the device may be damaged. Maximum reli-

ability is maintained if the output continuous current

never exceeds ±30 mA. This limit is set by the design of

the internal metal interconnects.

Output Phase Reversal

The EL5220C and EL5420C are immune to phase rever-

output of the device with the input voltage driven

beyond the supply rails. Although the device's output

will not change phase, the input's overvoltage should be

avoided. If an input voltage exceeds supply voltage by

more than 0.6V, electrostatic protection diodes placed in

the input stage of the device begin to conduct and over-

voltage damage could occur.