Rainbow-electronics MAX844 Manual de usuario Pagina 6

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MAX840/MAX843/MAX844
Low-Noise, Regulated, -2V GaAsFET Bias
6 _______________________________________________________________________________________
START-UP FROM SHUTDOWN
V
IN
= 3.6V, V
OUT
= -2V, I
OUT
= 4mA
500µs/div
V
OUT
1V/div
0V
0V
V
SHDN
2V/div
LINE-TRANSIENT RESPONSE
V
OUT
= -2V, I
OUT
= 4mA, AC COUPLED
5ms/div
V
OUT
10mV/div
V
IN
2.7V
3.3V
LOAD-TRANSIENT RESPONSE
V
IN
= 3.6V, V
OUT
= -2V
5ms/div
V
OUT
20mV/div
0.01mA
I
OUT
4mA
____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 2a, V
IN
= 3.6V, T
A
= +25°C, unless otherwise noted.)
MAX843/MAX844 NOISE SPECTRUM
(C1 = C2 = C3 = 0.22µF, C4 = 4.7µF)
50
0
0.1 1
10 100 1000
10
FREQUENCY (kHz)
NOISE (dBµV)
20
30
40
V
IN
= 3.6V,
I
OUT
= 4mA
V
OUT
NOTE: dBµV = 20 LOG
______
1µV
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