Chopper-Stabilized Op Amps
0.1µF 0.1µF
+7.5V
CLAMP
+15V
-15V
C
+
INPUT
OUT
R
741
IN
ICL7650
C
OUTPUT
-
ICL7650
R2
R1
CLAMP
R3
-7.5V
10k
0.1µF 0.1µF
10k
R3 + (R1 || R2) > 100kΩ
FOR FULL CLAMP EFFECT
NOTE: R1 || R2 INDICATES THE
PARALLEL COMBINATION OF
R1 || R2.
Figure 7. Using an Industry-Standard 741 to Boost Output
Drive Capability
Figure 6. Noninverting Amplifier with Optional Clamp
Chip Topography
INT/EXT
EXT/CLK IN
8
3
2
4
+15V
C
EXTB
INT/
CLK OUT
ICL7660
10µF
+7.5V
0V
C
EXTA
10µF
5
V+
6
OUTPUT
1M
0.090"
(2.29mm)
Figure 8. Splitting +15V with an ICL7660, 95% Efficiency
(Same for -15V)
-INPUT
+INPUT
V-
CLAMP
C
RETN
0.069"
(1.75mm)
10 ______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
