FUNCTION

Ultra-Low-Distortion, Single-Supply,

300MHz Op Amps with Enable

10

______________________________________________________________________________________

14 SO

1

—

EN

—

4, 5

ENA, ENB

8 µMAX/SO

2

—

IN-

—

2, 9

INA-, INB-

6

—

OUT

4, 5

6, 7

—

3, 10

INA+, INB+

3

—

IN+

—

11, 12

N.C.

7, 8

13, 14

—

1, 8

OUTA, OUTB

Pin Description

16 QSOP

—

4, 5

—

2, 11

—

6, 7

3, 12

—

8, 9, 13, 14

15, 16

1, 10

No Connection. Not internally connected.

Positive Power Supply. Connect to a +4.5V to +8.0V supply and

bypass with a 0.1µF capacitor for single-supply operation.

Amplifier Output

Amplifier Output

Negative Power Supply

Noninverting Input

Noninverting Input

Inverting Input

Inverting Input

MAX4268

MAX4269

MAX4270

NAME

MAX4265

MAX4266

MAX4267

PIN

FUNCTION

_______________Detailed Description

The MAX4265–MAX4270 single-supply operational

amplifiers feature ultra-low distortion and wide band-

width. Their low distortion and low noise make them

ideal for driving high-speed analog-to-digital converters

(ADCs) up to 16 bits in telecommunications applica-

tions and high-performance signal processing.

These devices can drive loads as low as 100

Ω and

deliver 45mA while maintaining DC accuracy and AC

performance. The input common-mode voltage ranges

swings to within 1.1V of the rails.

Low Distortion

The MAX4265–MAX4270 use proprietary bipolar tech-

nology to achieve minimum distortion in single-supply

systems—a feature typically available only in dual-sup-

ply op amps.

Several factors can affect the noise and distortion that a

device contributes to the input signal. The following

guidelines explain how various design choices impact

the total harmonic distortion (THD).

• Choose the proper feedback-resistor and gain-resis-

tor values for the application. In general, the smaller

the closed-loop gain, the smaller the THD generat-

ed—especially when driving heavy resistive loads.

Large-value feedback resistors can significantly

improve distortion. The MAX4265–MAX4270’s THD

normally increases at approximately 20dB per

decade at frequencies above 1MHz; this is a lower

rate than that of comparable dual-supply op amps.

• Operating the device near or above the full-power

bandwidth significantly degrades distortion (see the

Total Harmonic Distortion vs. Frequency graph in the

Typical Operating Characteristics).

• The decompensated devices (MAX4266/MAX4267/

MAX4269/MAX4270) deliver the best distortion per-

formance since they have a slightly higher slew rate

and provide a higher amount of loop gain for a given

closed-loop gain setting.