MAX840/MAX843/MAX844
Low-Noise, Regulated, -2V GaAsFET Bias
4 _______________________________________________________________________________________
____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 2a, V
IN
= 3.6V, T
A
= +25°C, unless otherwise noted.)
MAX840 OUTPUT NOISE AND RIPPLE
(C1 = C2 = C3 = 1µF, C4 = 10µF)
V
IN
= 3.6V, V
OUT
= -2V, I
OUT
= 4mA, AC COUPLED
10µs/div
V
OUT
500µV/div
MAX840 OUTPUT NOISE AND RIPPLE
(C1 = C2 = C3 = 0.22µF, C4 = 4.7µF)
V
IN
= 3.6V, V
OUT
= -2V, I
OUT
= 4mA, AC COUPLED
10µs/div
V
OUT
1mV/div
MAX843/MAX844 OUTPUT NOISE AND RIPPLE
(C1 = C2 = C3 = 1µF, C4 = 10µF)
V
IN
= 3.6V, V
OUT
= -2V, I
OUT
= 4mA, AC COUPLED
10µs/div
V
OUT
500µV/div
MAX843/MAX844 OUTPUT NOISE AND RIPPLE
(C1 = C2 = C3 = 0.22µF, C4 = 4.7µF)
V
IN
= 3.6V, V
OUT
= -2V, I
OUT
= 4mA, AC COUPLED
10µs/div
V
OUT
1mV/div
70
10
OSCILLATOR FREQUENCY
vs. SUPPLY VOLTAGE
90
80
MAX840-17
SUPPLY VOLTAGE (V)
OSCILLATOR FREQUENCY (kHz)
6
150
140
120
130
110
100
24 83579
T
A
= +25°C, +85°C
T
A
= -40°C
SHDN = HIGH
15
10
MAX844
OSCILLATOR FREQUENCY vs. SUPPLY VOLTAGE
19
17
MAX840-18
SUPPLY VOLTAGE (V)
OSCILLATOR FREQUENCY (kHz)
6
31
29
25
27
23
21
24 83579
T
A
= +25°C, +85°C
T
A
= -40°C
SHDN = LOW
