Rainbow Electronics MAX844 - Manual (Page 9)

MAX840/MAX843/MAX844
Low-Noise, Regulated, -2V GaAsFET Bias
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MAX840
FB
OUT
SHDN
NEGOUT
C1-
C1+
IN
GND
V IN
C3
1
µ F
V
OUT
= -2V
(V
GG
of GaAsFET)
C4
10
µ F
C1
1 µ F
C2
1 µ F
1
ON/OFF
2
3
4 5
6
8
7
MAX840
FB
OUT
SHDN
NEGOUT
C1-
C1+
IN
GND
V
IN
C3
1
µ F
V
OUT
= (-0.5V) 1+
R2
R1
C4
10
µ F
C1
1 µ F
C2
1 µ F
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
1
µ F
V OUT = -0.5V to -9.4V @ 4mA
C4
10
µ F
C1
1 µ F
C2
1 µ F
R2
100k
R1
100k
V
CTRL
(0V TO 10V)
1
2
3
4 5
6
8
7
ON/OFF
MAX840
FB
OUT
SHDN
NEGOUT
C1-
C1+
IN
GND
V IN
C3
0.22
µ F
V
OUT
= -2V
(V
GG
of GaAsFET)
C4
4.7
µ F
C1
0.22 µ F
C2
0.22 µ F
1
2
3
4 5
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