Rainbow-electronics MAX844 Manual de usuario Pagina 9

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MAX840/MAX843/MAX844
Low-Noise, Regulated, -2V GaAsFET Bias
_______________________________________________________________________________________ 9
MAX840
FB
OUT
SHDN
NEGOUT
C1-
C1+
IN
GND
V
IN
C3
1µF
V
OUT
= -2V
(V
GG
of GaAsFET)
C4
10µF
C1
1µF
C2
1µF
1
ON/OFF
2
3
45
6
8
7
MAX840
FB
OUT
SHDN
NEGOUT
C1-
C1+
IN
GND
V
IN
C3
1µF
V
OUT
= (-0.5V) 1+
R2
R1
C4
10µF
C1
1µF
C2
1µF
R2
100k
R1
100k
(
)
1
2
3
4
5
6
8
7
ON/OFF
MAX843
MAX844
CONT
OUT
SHDN
NEGOUT
C1-
C1+
IN
GND
V
IN
C3
1µF
V
OUT
= -0.5V to -9.4V @ 4mA
C4
10µF
C1
1µF
C2
1µF
R2
100k
R1
100k
V
CTRL
(0V TO 10V)
1
2
3
45
6
8
7
ON/OFF
MAX840
FB
OUT
SHDN
NEGOUT
C1-
C1+
IN
GND
V
IN
C3
0.22µF
V
OUT
= -2V
(V
GG
of GaAsFET)
C4
4.7µF
C1
0.22µF
C2
0.22µF
1
2
3
45
6
8
7
ON/OFF
Figure 2a. MAX840 Standard Application Circuit Figure 2b. MAX840 Adjustable Configuration
Figure 2d. MAX840 Application Circuit Using Smaller Capacitors
Figure 2c. MAX843/MAX844 Standard Application Circuit
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