Rainbow Electronics MAX844 - Manual (Page 6)

MAX840/MAX843/MAX844
Low-Noise, Regulated, -2V GaAsFET Bias
6 _______________________________________________________________________________________
START-UP FROM SHUTDOWN
V IN = 3.6V, V OUT = -2V, I OUT = 4mA
500 µ s/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 = 0.22 µ F, C4 = 4.7 µ F)
50
0
0.1 1 10 100 1000
10
FREQUENCY (kHz)
NOISE (dB
µ V)
20
30
40
V IN = 3.6V,
I OUT = 4mA
V OUT
NOTE: dBµV = 20 LOG ______
1µV