Data Sheet

ICL7660S, ICL7660A
FN3179 Rev 7.00 Page 7 of 13
January 23, 2013
FIGURE 11. OUTPUT SOURCE RESISTANCE AS A FUNCTION OF OSCILLATOR FREQUENCY
NOTE:
14. These curves include, in the supply current, that current fed directly into the load R
L
from the V+ (see Figure 12). Thus, approximately half the
supply current goes directly to the positive side of the load, and the other half, through the ICL7660S and ICL7660A, goes to the negative side
of the load. Ideally, V
OUT
2V
IN
, I
S
 2I
L
, so V
IN
x I
S
 V
OUT
x I
L
.
Typical Performance Curves
See Figure 12, “ICL7660S Test Circuit” on page 7) and Figure 13 “ICL7660A Test Circuit” on page 7 (Continued)
OUTPUT RESISTANCE (Ω)
400
300
200
100
0
100 1k 10k 100k
OSCILLATOR FREQUENCY (Hz)
V+ = 5V
T
A
= +25°C
I = 10mA
C
1
= C
2
= 10mF
C
1
= C
2
= 1mF
C
1
= C
2
= 100mF
1
2
3
4
8
7
6
5
+
-
C
1
10µF
I
S
V+
(+5V)
I
L
R
L
-V
OUT
C
2
10µF
ICL7660S
V+
+
-
NOTE: For large values of C
OSC
(>1000pF), the values of C
1
and C
2
should be increased to 100µF.
FIGURE 12. ICL7660S TEST CIRCUIT
NOTE: For large values of C
OSC
(>1000pF) the values of C
1
and C
2
should be increased to 100F.
FIGURE 13. ICL7660A TEST CIRCUIT
1
2
3
4
8
7
6
5
+
-
C
1
10µF
I
S
V+
(+5V)
I
L
R
L
-V
OUT
C
2
10µF
ICL7660A
C
OSC
+
-
(NOTE)