Rainbow-electronics MAX881R Manual de usuario descargar pdf (Pagina 5)

MAX881R

Low-Noise Bias Supply in µMAX

with Power-OK for GaAsFET PA

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CHARGE PUMP

NEGOUT

SHDN

0.5V 0.4625V

GND

C1+

OUT

POK

C1-

MAX881R

Pin Description

GroundGND8

No Connection. Not internally connected.N.C.9

Positive Power-Supply InputIN10

Active-Low, Logic-Level Shutdown Input. Connect to IN for normal operation. Do not leave this pin

unconnected.

SHDN

Dual-Mode™ Feedback Input. When FB is connected to GND, the output is preset to -2V. To select

other voltages, connect FB to an external resistor-divider (Figure 4). Do not leave this pin

unconnected.

FB6

Regulated Negative Output VoltageOUT7

Active-Low, Open-Drain Power-OK Output. Goes low when OUT reaches 92.5% of its set value.

POK

Negative Output Voltage (unregulated)NEGOUT3

Negative Terminal for C1C1-2

Positive Terminal for C1C1+1

FUNCTIONNAME

Figure 1. Functional Diagram

Dual-Mode is a trademark of Maxim Integrated Products.

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Rainbow-electronics MAX881R Manual de usuario Pagina 5