MAX840 Maxim, MAX840 Datasheet - Page 9

• Manufacturer Part Number: MAX840
• Description: Low-Noise / Regulated / -2V GaAsFET Bias
• Manufacturer: Maxim

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