MAX881 Maxim, MAX881 Datasheet - Page 4

• Manufacturer Part Number: MAX881
• Description: Low-Noise Bias Supply in MAX with Power-OK for GaAsFET PA
• Manufacturer: Maxim

SHDN
Low-Noise Bias Supply in µMAX
with Power-OK for GaAsFET PA
(
4
Circuit of Figure 3, V
V
POK
OUT
_______________________________________________________________________________________
V
CIRCUIT OF FIGURE 3b
IN
= 3.6V
START-UP FROM SHUTDOWN
-10
-20
-30
-40
V
60
50
40
30
20
10
OUT
0
V
(NO LOAD)
IN
100 s/div
1
I
V
CIRCUIT OF FIGURE 3b
V
V
I
LOAD
IN
OUT
OUT
IN
OUT
= 3.6V
= 3.6V, T
= 2.5mA
= -2V
= 4mA
LINE-TRANSIENT RESPONSE
OUTPUT NOISE SPECTRUM
= -2V
(CIRCUIT OF FIGURE 3a)
10
FREQUENCY (kHz)
MAX881R-TOC10
A
2ms/div
= +25°C, unless otherwise noted.
0
0
-2V
V
0
+5V
IN
100
AC COUPLED
MAX881R-TOC15
1mV/div
V
OUT
Typical Operating Characteristics (continued)
1000
3.3V
2.7V
10mV/
div
V
V
I
OUT
IN
OUT
= 3.6V
= 2.5mA
OUTPUT NOISE AND RIPPLE
= -2V
(CIRCUIT OF FIGURE 3a)
5 s/div
)
MAX881R-TOC11
V
-10
-20
-30
-40
I
60
50
40
30
20
10
OUT
OUT
0
1
V
V
CIRCUIT OF FIGURE 3b
V
V
I
IN
OUT
OUT
IN
OUT
= 3.6V
AC COUPLED
AC COUPLED
= 3.6V
LOAD-TRANSIENT RESPONSE
= -2V
= 4mA
= -2V
V
OUTPUT NOISE SPECTRUM
V
OUT
(CIRCUIT OF FIGURE 3b)
IN
V
1mV/div
1mV/div
OUT
V
= 3.6V
IN
= -2V
= 0
= 0
10
FREQUENCY (kHz)
100 s/div
R
L
= 500
OUTPUT NOISE AND RIPPLE
(CIRCUIT OF FIGURE 3b)
100
OUTPUT NOISE
MAX881R-TOC16
NOISE FLOOR
10 s/div
1000
4mA
400 A
10mV/
div
MAX881R-TOC12