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.)
OSCILLATOR FREQUENCY
vs. SUPPLY VOLTAGE
MAX840-17
MAX844
OSCILLATOR FREQUENCY vs. SUPPLY VOLTAGE
29
27
25
T
A
= -40°C
23
21
19
17
15
10
SHDN = LOW
T
A
= +25°C, +85°C
MAX840-18
150
OSCILLATOR FREQUENCY (kHz)
140
130
120
110
100
90
80
70
2
3
4
5
6
7
8
9
SUPPLY VOLTAGE (V)
SHDN = HIGH
T
A
= +25°C, +85°C
T
A
= -40°C
31
OSCILLATOR FREQUENCY (kHz)
2
3
4
5
6
7
8
9
10
SUPPLY VOLTAGE (V)
MAX840 OUTPUT NOISE AND RIPPLE
(C1 = C2 = C3 = 1µF, C4 = 10µF)
MAX840 OUTPUT NOISE AND RIPPLE
(C1 = C2 = C3 = 0.22µF, C4 = 4.7µF)
V
OUT
500µV/div
V
OUT
1mV/div
10µs/div
V
IN
= 3.6V, V
OUT
= -2V, I
OUT
= 4mA, AC COUPLED
10µs/div
V
IN
= 3.6V, V
OUT
= -2V, I
OUT
= 4mA, AC COUPLED
MAX843/MAX844 OUTPUT NOISE AND RIPPLE
(C1 = C2 = C3 = 1µF, C4 = 10µF)
MAX843/MAX844 OUTPUT NOISE AND RIPPLE
(C1 = C2 = C3 = 0.22µF, C4 = 4.7µF)
V
OUT
500µV/div
V
OUT
1mV/div
10µs/div
V
IN
= 3.6V, V
OUT
= -2V, I
OUT
= 4mA, AC COUPLED
10µs/div
V
IN
= 3.6V, V
OUT
= -2V, I
OUT
= 4mA, AC COUPLED
4
_______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
