Rainbow-electronics MAX881R Instrukcja Użytkownika Pobierz pdf (Strona 4)

MAX881R

Low-Noise Bias Supply in µMAX

with Power-OK for GaAsFET PA

4 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(Circuit of Figure 3, V

= 3.6V, T

= +25°C, unless otherwise noted.)

100µs/div

START-UP FROM SHUTDOWN

(NO LOAD)

+5V

OUT

POK

SHDN

MAX881R-TOC10

-2V

= 3.6V

CIRCUIT OF FIGURE 3b

5µs/div

OUTPUT NOISE AND RIPPLE

(CIRCUIT OF FIGURE 3a)

OUT

1mV/div

AC COUPLED

MAX881R-TOC11

= 3.6V

OUT

= -2V

OUT

= 2.5mA

10µs/div

OUTPUT NOISE AND RIPPLE

(CIRCUIT OF FIGURE 3b)

OUT

= 0

1mV/div

AC COUPLED

OUT

= -2V

= 3.6V

1mV/div

AC COUPLED

MAX881R-TOC12

= 500Ω

NOISE FLOOR

OUTPUT NOISE

-40

1 10 100 1000

OUTPUT NOISE SPECTRUM

(CIRCUIT OF FIGURE 3a)

-20

MAX881R TOC13

FREQUENCY (kHz)

NOISE (dBµV)

-30

-10

= 3.6V

OUT

= -2V

OUT

= 2.5mA

-40

1 10 100 1000

OUTPUT NOISE SPECTRUM

(CIRCUIT OF FIGURE 3b)

-20

MAX881R TOC14

FREQUENCY (kHz)

NOISE (dBµV)

-30

-10

= 3.6V

OUT

= -2V

OUT

= 4mA

2ms/div

LINE-TRANSIENT RESPONSE

OUT

MAX881R-TOC15

10mV/

div

3.3V

2.7V

LOAD

= 4mA

OUT

= -2V

CIRCUIT OF FIGURE 3b

100µs/div

LOAD-TRANSIENT RESPONSE

OUT

MAX881R-TOC16

10mV/

div

4mA

400µA

= 3.6V

OUT

= -2V

CIRCUIT OF FIGURE 3b

1 2 3 4 5 6 7 8

Low-Noise Bias Supply in µMAX 1

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