SC70, Low-Power, General-Purpose,

Dual-Supply, Rail-to-Rail Op Amps

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7

Pin Description

PIN

MAX4493

MAX4494

MAX4495

NAME

FUNCTION

—

1

1

OUTA

Channel A Output

—

2

2

INA-

Channel A Inverting Input

—

3

3

INA+

Channel A Noninverting Input

—

7

7

OUTB

Channel B Output

—

6

6

INB-

Channel B Inverting Input

—

5

5

INB+

Channel B Noninverting Input

—

—

8

OUTC

Channel C Output

—

—

9

INC-

Channel C Inverting Input

—

—

10

INC+

Channel C Noninverting Input

—

—

14

OUTD

Channel D Output

—

—

13

IND-

Channel D Inverting Input

—

—

12

IND+

Channel D Noninverting Input

4

—

—-

OUT

Output

1

—

—

IN+

Noninverting Input

3

—

—

IN-

Inverting Input

58

4

Positive Supply

24

11

Negative Supply

Applications Information

Rail-to-Rail Output Stage

The MAX4493/MAX4494/MAX4495 output stage can

drive up to 1kΩ and still swing within 200mV of the rails.

Capacitive-Load Stability

Driving large capacitive loads can cause instability in

many op amps. The MAX4493/MAX4494/MAX4495 are

stable with capacitive loads up to 300pF. The

Capacitive-Load Stability graph in the

Typical

Operating Characteristics gives the stable operation

region for capacitive versus resistive load. Stability with

higher capacitive loads can be improved by adding an

isolation resistor in series with the op-amp output, as

shown in Figure 1. This resistor improves the circuit’s

phase margin by isolating the load capacitor from the

amplifier’s output. As seen in the

Typical Operating

Characteristics, driving capacitive loads with an isola-

tion resistor exhibits some overshoot, but no oscillation.

Full-Power Bandwidth

The FPBW is given by:

FPBW Hz

SR

()

(max)

−

π

INPUT

OUTPUT

MAX4493

Figure 1. Capacitive Load Driving Circuit