Low-Noise, Regulated, -2V GaAsFET Bias
MAX840/MAX843/MAX844
____________________________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
V
IN
= 3.6V,
I
OUT
= 4mA
40
NOISE (dBµV)
30
20
10
0
V
OUT
NOTE: dBµV = 20 LOG ______
1µV
0.1
1
10
FREQUENCY (kHz)
100
1000
START-UP FROM SHUTDOWN
0V
V
OUT
1V/div
V
SHDN
2V/div
0V
500µs/div
V
IN
= 3.6V, V
OUT
= -2V, I
OUT
= 4mA
LOAD-TRANSIENT RESPONSE
LINE-TRANSIENT RESPONSE
V
OUT
20mV/div
V
OUT
10mV/div
0.01mA
4mA
I
OUT
3.3V
V
2.7V
IN
5ms/div
V
IN
= 3.6V, V
OUT
= -2V
5ms/div
V
OUT
= -2V, I
OUT
= 4mA, AC COUPLED
6
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
