MAX4387ESA View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX4387ESA

+3V/+5V, 250MHz, SOT23 ADC Buffer Amplifiers with High-Speed Disable

Maxim Integrated 

+3V/+5V, 250MHz, SOT23 ADC Buffer Amplifiers

with High-Speed Disable

MAX4285

MAX4286

6-PIN

SOT23-6

8-PIN

SO

—

1, 5

1

6

2

4

3

3

4

2

5

8

—

—

—

—

6

7

—

—

—

—

—

—

—

—

—

—

—

—

PIN

MAX4287

MAX4387

8-PIN

µMAX/SO

—

—

4

—

—

—

—

—

8

1

2

3

5

6

7

Pin Description

MAX4288

MAX4388

10-PIN

µMAX

14-PIN

SO

—

5, 7, 8, 10

—

—

4

4

—

—

—

—

—

—

5

6

6

9

10

14

1

1

2

2

3

3

7

11

8

12

9

13

NAME

N.C.

OUT

VEE

IN+

IN-

DISABLE

DISABLEA

DISABLEB

VCC

OUTA

INA-

INA+

INB+

INB-

OUTB

FUNCTION

Not Internally Connected. Connect to

ground or leave unconnected.

Amplifier Output

Negative Power Supply, or Ground in

Single-Supply Operation

Noninverting Input

Inverting Input

Disable (active low)

Disable Amplifier A (active low)

Disable Amplifier B (active low)

Positive Power Supply

Amplifier A Output

Amplifier A Inverting Input

Amplifier A Noninverting Input

Amplifier B Noninverting Input

Amplifier B Inverting Input

Amplifier B Output

Detailed Description

The MAX4285–MAX4288 and MAX4387/MAX4388 are

voltage-feedback op amps, intended for use as ADC

input buffers. They operate from a single +2.85V to

+6.5V supply or dual ±1.425V to ±3.25V supplies. Their

high output drive, wide bandwidth, fast settling, low

noise, and low distortion make them ideal for the brutal

task of meeting the dynamic input drive requirements of

high-speed ADCs or other demanding applications.

The MAX4285/MAX4286/MAX4288 and MAX4388 have

a high-speed disable mode that places the outputs in a

high-impedance state and lowers operating supply cur-

rent to 1mA. The enable time is typically 40ns, and the

disable time is typically 50ns. The MAX4285/MAX4286

have a single enable pin (DISABLE), and the MAX4288/

MAX4388 have dual disable pins (DISABLEA, DISA-

BLEB).

The MAX4285/MAX4287/MAX4288 are internally com-

pensated for unity-gain stability. The MAX4286/

MAX4387/MAX4388 are compensated for gains of

+5V/V or greater.

Applications Information

Inverting and Noninverting Configurations

Select the gain-setting feedback (RF) and input (RG)

resistor values considering the following criteria: large

resistor values increase voltage noise and interact with

the amplifier’s input and PC board capacitance to

effect system bandwidth. This generates undesirable

poles and zeros that decrease bandwidth or cause

oscillations.

______________________________________________________________________________________ 11

Share Link: