Rainbow-electronics MAX881R Manual do Utilizador descarregar pdf

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 408-737-7600 ext. 3468.

General Description

The MAX881R low-noise, inverting power supply is

designed for biasing GaAsFET power amplifiers in

portable wireless applications. This device is a charge-

pump inverter followed by a negative linear regulator.

The input voltage range is 2.5V to 5.5V. The output is

preset at -2.0V or can be set, using two resistors, to any

voltage from -0.5V to (-V

+ 0.6V). It can deliver up to

4mA. The internal linear regulator also filters the output

to 1mVp-p ripple and noise.

Other features include a power-OK (POK) output that sig-

nals when the negative voltage is within 7.5% of its set

point. It protects the GaAsFET by not allowing power to

be applied to the GaAsFET’s drain until it is properly

biased. The signal can be routed either to a microcon-

troller or directly to a switch at the GaAsFET drain. The

MAX881R is available in a space-saving 10-pin µMAX

package.

Applications

Cell Phones

PCS Phones

PHS Phones

Wireless Handsets

Wireless Modems

Two-Way Pagers

Mobile Radios

Wireless Computers

Features

♦ Small µMAX Package

♦ 1mVp-p Output Voltage Ripple and Noise

♦ Power-OK Signal to Control GaAsFET Drain

Switch

♦ 0.05µA Logic-Controlled Shutdown

♦ 1ms Guaranteed Start-Up

♦ 2.5V to 5.5V Input

♦ -0.5V to (-V

+ 0.6V) Output at up to 4mA

♦ Operates with One 4.7µF and Three 0.22µF

Capacitors (no inductors needed)

MAX881R

Low-Noise Bias Supply in µMAX

with Power-OK for GaAsFET PA

________________________________________________________________

Maxim Integrated Products

N.C.

GND

OUTPOK

N.C. = NOT INTERNALLY CONNECTED

NEGOUT

C1-

C1+

MAX881R

µMAX

TOP VIEW

FBSHDN

MAX881R

OUT

POK

C1+

C1-

NEGOUT

GND

SHDN

CONTROLS

GaAsFET PA’s

DRAIN SWITCH

OUTPUT

-2V (OR ADJ)

4mA, 1mVp-p

RIPPLE

INPUT

2.5V TO 5.5V

OFF

Typical Operating Circuit

19-1372; Rev 1; 6/98

PART

MAX881REUB -40°C to +85°C

TEMP. RANGE PIN-PACKAGE

10 µMAX

EVALUATION KIT

AVAILABLE

Pin Configuration

Ordering Information

1 2 3 4 5 6 7 8

Low-Noise Bias Supply in µMAX 1

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For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.For small orders, phone 408-737-7600 ext. 3468.General

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MAX881RLow-Noise Bias Supply in µMAXwith Power-OK for GaAsFET PA 8 ___________________________________________________________________________________

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Rainbow-electronics MAX881R Manual do Utilizador

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